AbstractAccurate and efficient sampling of fog droplets is a prerequisite for online measurement. The performance of such a sampler relies on the internal flow field, temperature, and humidity. Based on aerodynamics and turbulence theory, we designed a fog droplet sampler with multi-segment structure and specific temperature control. First, we used COMSOL to investigate the effects of key system parameters. The sampling efficiency first increased and then decreased with sampling flow. The reason was that the impact force under reasonable flows maintained particles in suspension, whereas high flows with high turbulence intensity increased the likelihood of particles colliding with the walls. Based on the simulations, we determined the optimal sampling flow (1000 L/min), segment structure (a cylindrical inlet), and segment dimension (25 mm for the optical measurement segment) of the sampler, with a sampling efficiency of 0.87. Subsequently, we investigated the effects of temperature, relative humidity, and sampling flow on the particle size. Size change increased with temperature but decreased with relative humidity and sampling flow. Additionally, temperature control contributed to condensation prevention, and size change was < 1% when the temperature was 15 °C. Finally, we conducted an experiment for verification purposes. The sampling efficiency of the fabricated system was 0.77, i.e., 11.49% lower than for the simulation. Size change was < 1 μm in both the simulations and the experiments, while variation was 6.30% in the experiment, i.e., a difference of 3.97% from the simulation. Hence, the designed fog droplet sampler achieved accurate and efficient sampling of fog droplets.Keywords: Fog droplet samplersampling efficiencyenvironmental conditionstemperature controlsimulation analysis AcknowledgmentsWe thank James Buxton MSc, from Liwen Bianji (Edanz) (www.liwenbianji.cn/), for editing the English text of a draft of this manuscript.Disclosure statementNo potential conflicts of interest are reported by the authors.Additional informationFundingThis research was supported by the National Natural Science Foundation of China (No. 41905028, 91544218), the Comprehensive Science Center Project of Hefei (No. E03H0K11), the Hefei Municipal Natural Science Foundation (Grant No. 2021007), the Key Research and Development Program of Anhui Province (No. 202004a07020048), and the HFIPS Director’s Fund (No. BJPY2021A04).
{"title":"Development of a fog droplet sampler with multi-segment structure and specific temperature control","authors":"Liansi Sun, Yin Cheng, Jiaoshi Zhang, Dexia Wu, Jie Wang, Yixin Yang, Huaqiao Gui","doi":"10.1080/10739149.2023.2271564","DOIUrl":"https://doi.org/10.1080/10739149.2023.2271564","url":null,"abstract":"AbstractAccurate and efficient sampling of fog droplets is a prerequisite for online measurement. The performance of such a sampler relies on the internal flow field, temperature, and humidity. Based on aerodynamics and turbulence theory, we designed a fog droplet sampler with multi-segment structure and specific temperature control. First, we used COMSOL to investigate the effects of key system parameters. The sampling efficiency first increased and then decreased with sampling flow. The reason was that the impact force under reasonable flows maintained particles in suspension, whereas high flows with high turbulence intensity increased the likelihood of particles colliding with the walls. Based on the simulations, we determined the optimal sampling flow (1000 L/min), segment structure (a cylindrical inlet), and segment dimension (25 mm for the optical measurement segment) of the sampler, with a sampling efficiency of 0.87. Subsequently, we investigated the effects of temperature, relative humidity, and sampling flow on the particle size. Size change increased with temperature but decreased with relative humidity and sampling flow. Additionally, temperature control contributed to condensation prevention, and size change was < 1% when the temperature was 15 °C. Finally, we conducted an experiment for verification purposes. The sampling efficiency of the fabricated system was 0.77, i.e., 11.49% lower than for the simulation. Size change was < 1 μm in both the simulations and the experiments, while variation was 6.30% in the experiment, i.e., a difference of 3.97% from the simulation. Hence, the designed fog droplet sampler achieved accurate and efficient sampling of fog droplets.Keywords: Fog droplet samplersampling efficiencyenvironmental conditionstemperature controlsimulation analysis AcknowledgmentsWe thank James Buxton MSc, from Liwen Bianji (Edanz) (www.liwenbianji.cn/), for editing the English text of a draft of this manuscript.Disclosure statementNo potential conflicts of interest are reported by the authors.Additional informationFundingThis research was supported by the National Natural Science Foundation of China (No. 41905028, 91544218), the Comprehensive Science Center Project of Hefei (No. E03H0K11), the Hefei Municipal Natural Science Foundation (Grant No. 2021007), the Key Research and Development Program of Anhui Province (No. 202004a07020048), and the HFIPS Director’s Fund (No. BJPY2021A04).","PeriodicalId":13547,"journal":{"name":"Instrumentation Science & Technology","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135412846","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-11DOI: 10.1080/10739149.2023.2264956
Ali Yıldız, Ayşe Gülçin Küçükkaya, Esma Mıhlayanlar
AbstractThe formation of black crust upon building stones and the resulting damage depend upon the fabric of the stone and atmospheric effects. The formation of black crust on limestone occurs more rapidly and distinctly compared to stones such as granite and sandstone, in which the mineral calcite is absent or in small quantities in its composition. In this study, black crust formation developed on the surfaces of limestone in İstanbul and Edirne, where important historical monuments belonging to the Byzantine and Ottoman Empires are located, were examined visually, microscopically, and experimentally. The factors causing the development of this crust and their effects on weathering were determined, and comparative analyses of the black crust with the sub-layer stone were made. In addition, by classifying the morphology, chemical structure, mineralogical composition, and damage to the stone by the black crust, chemical, and physical weathering that causes surface deterioration on the stone and back of the crust were examined. Physical (Schmidt hammer), mineralogical (X-ray diffraction), petrographic (polarizing microscopy), chemical (inductively coupled plasma-emission spectrometry, inductively coupled plasma-mass spectrometry, Fourier transform infrared spectrometry), and microstructural (field emission scanning electron microscopy with energy dispersive X-ray spectrometry) analyses were carried out to characterize this process. The black crust formation on limestone was shown to be caused by sulfation.Keywords: Architectural analysisblack crustgypsumlimestonestone decay AcknowledgmentThe authors are thankful to the financial support provided by Trakya University Research Project Fund (TUBAP) with project number of TÜBAP 2009/92.Disclosure statementNo potential conflict of interest was reported by the authors.
{"title":"Investigation and characterization of black crusts on limestone at historical buildings in the cities of İstanbul and Edirne (Turkey)","authors":"Ali Yıldız, Ayşe Gülçin Küçükkaya, Esma Mıhlayanlar","doi":"10.1080/10739149.2023.2264956","DOIUrl":"https://doi.org/10.1080/10739149.2023.2264956","url":null,"abstract":"AbstractThe formation of black crust upon building stones and the resulting damage depend upon the fabric of the stone and atmospheric effects. The formation of black crust on limestone occurs more rapidly and distinctly compared to stones such as granite and sandstone, in which the mineral calcite is absent or in small quantities in its composition. In this study, black crust formation developed on the surfaces of limestone in İstanbul and Edirne, where important historical monuments belonging to the Byzantine and Ottoman Empires are located, were examined visually, microscopically, and experimentally. The factors causing the development of this crust and their effects on weathering were determined, and comparative analyses of the black crust with the sub-layer stone were made. In addition, by classifying the morphology, chemical structure, mineralogical composition, and damage to the stone by the black crust, chemical, and physical weathering that causes surface deterioration on the stone and back of the crust were examined. Physical (Schmidt hammer), mineralogical (X-ray diffraction), petrographic (polarizing microscopy), chemical (inductively coupled plasma-emission spectrometry, inductively coupled plasma-mass spectrometry, Fourier transform infrared spectrometry), and microstructural (field emission scanning electron microscopy with energy dispersive X-ray spectrometry) analyses were carried out to characterize this process. The black crust formation on limestone was shown to be caused by sulfation.Keywords: Architectural analysisblack crustgypsumlimestonestone decay AcknowledgmentThe authors are thankful to the financial support provided by Trakya University Research Project Fund (TUBAP) with project number of TÜBAP 2009/92.Disclosure statementNo potential conflict of interest was reported by the authors.","PeriodicalId":13547,"journal":{"name":"Instrumentation Science & Technology","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136211697","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-03DOI: 10.1080/10739149.2023.2259976
Van Tu Duong, Quoc Minh Lam, Ngoc Anh Duy Hoang, Minh Tri Nguyen, Cong Toai Truong, Huy Hung Nguyen, Tan Tien Nguyen
It is easy to find electromagnetic contactors in modern electromechanical devices owing to their advantages, which encompass a simple structure, ease of use, and low cost. However, these devices also have inherent drawbacks, including heat dissipation, contact erosion, and inefficient power consumption during long-term operation. This has sparked interest in contact soft-landing, which aims to reduce issues like contact bounces, contact welding, and arcing. This paper presents the development of a testing apparatus for investigating the electromagnetic dynamics of contactors or mechanical relays, aimed at developing an open-loop model-based controller for contact soft-landing. Theoretical equations based on physical theorems are derived to describe the behavior of the electromagnetic coil under varying factors. Additionally, a pilot study was conducted using the proposed testing apparatus to explore the relationship between heat dissipation, flowing current, air gap, and the Lorentz force produced by exposing ferromagnetic material to the magnetic field surrounding the electromagnetic coil. The experimental and simulation results showed good fitting, with a normalized root mean squared error ranging from 2.5% to 4.5% for various scenarios. Notably, it was found that the flowing current passing through the electromagnetic coil can be controlled by changing the duty cycle of the pulse width modulation signal driving the conductivity of the MOSFET. However, the results suggest that a modulation frequency greater than 5 kHz is not suitable for driving the electromagnetic coil.
{"title":"Development of testing apparatus for investigating electromagnetic dynamics of contactors: A pilot study","authors":"Van Tu Duong, Quoc Minh Lam, Ngoc Anh Duy Hoang, Minh Tri Nguyen, Cong Toai Truong, Huy Hung Nguyen, Tan Tien Nguyen","doi":"10.1080/10739149.2023.2259976","DOIUrl":"https://doi.org/10.1080/10739149.2023.2259976","url":null,"abstract":"It is easy to find electromagnetic contactors in modern electromechanical devices owing to their advantages, which encompass a simple structure, ease of use, and low cost. However, these devices also have inherent drawbacks, including heat dissipation, contact erosion, and inefficient power consumption during long-term operation. This has sparked interest in contact soft-landing, which aims to reduce issues like contact bounces, contact welding, and arcing. This paper presents the development of a testing apparatus for investigating the electromagnetic dynamics of contactors or mechanical relays, aimed at developing an open-loop model-based controller for contact soft-landing. Theoretical equations based on physical theorems are derived to describe the behavior of the electromagnetic coil under varying factors. Additionally, a pilot study was conducted using the proposed testing apparatus to explore the relationship between heat dissipation, flowing current, air gap, and the Lorentz force produced by exposing ferromagnetic material to the magnetic field surrounding the electromagnetic coil. The experimental and simulation results showed good fitting, with a normalized root mean squared error ranging from 2.5% to 4.5% for various scenarios. Notably, it was found that the flowing current passing through the electromagnetic coil can be controlled by changing the duty cycle of the pulse width modulation signal driving the conductivity of the MOSFET. However, the results suggest that a modulation frequency greater than 5 kHz is not suitable for driving the electromagnetic coil.","PeriodicalId":13547,"journal":{"name":"Instrumentation Science & Technology","volume":"125 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135739010","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-31DOI: 10.1080/10739149.2023.2193635
Nam Duong Thanh, H. T. Tran Thi, Trung Nguyen Quang, Huy Nguyen Van, Giang Hoang Nguyen, Quyet Nguyen Huu, Tung Tran Son
Abstract The rapid industrialization of nations in Southeast Asia (SEA) has led to a decline in these countries’ air quality, including high levels of particulate matter (PM). Monitoring these air pollutants is crucial to understanding the pollution status of the area and developing management plans for improvement. The metrological conditions in the region present challenges as high temperature and high humidity have been known to cause errors in the measurements. This study investigated the performance of five PM monitoring instruments with different working principles. The air temperature was mostly over 25 °C with relative humidity usually remaining above 80%, which is typical of SEA weather. Measurements from all instruments had good correlations with each other as their linear regressions yielded slopes of 1 ± 0.15 and R2 > 0.65. Moreover, this study found that depending on the chosen reference instrument, not all factors affect the devices equally. In particular, using Partisol as a reference, the PM2.5 concentration, air temperature, and relative humidity had less impact upon the relative bias level compared to using Leckel as a reference. In addition, the high cost of monitoring instruments also poses financial constraints on how many monitoring stations can be deployed. To tackle this issue, this study presents ManPMS whose design is based on that of the USEPA Title 40 Part 50 with slight modifications. The cost to manufacture and assemble the instrument was only 2/3 the price of a typical instrument with similar performance.
{"title":"Performance evaluation of multiple particulate matter monitoring instruments under higher temperatures and relative humidity in Southeast Asia and design of an affordable monitoring instrument (ManPMS)","authors":"Nam Duong Thanh, H. T. Tran Thi, Trung Nguyen Quang, Huy Nguyen Van, Giang Hoang Nguyen, Quyet Nguyen Huu, Tung Tran Son","doi":"10.1080/10739149.2023.2193635","DOIUrl":"https://doi.org/10.1080/10739149.2023.2193635","url":null,"abstract":"Abstract The rapid industrialization of nations in Southeast Asia (SEA) has led to a decline in these countries’ air quality, including high levels of particulate matter (PM). Monitoring these air pollutants is crucial to understanding the pollution status of the area and developing management plans for improvement. The metrological conditions in the region present challenges as high temperature and high humidity have been known to cause errors in the measurements. This study investigated the performance of five PM monitoring instruments with different working principles. The air temperature was mostly over 25 °C with relative humidity usually remaining above 80%, which is typical of SEA weather. Measurements from all instruments had good correlations with each other as their linear regressions yielded slopes of 1 ± 0.15 and R2 > 0.65. Moreover, this study found that depending on the chosen reference instrument, not all factors affect the devices equally. In particular, using Partisol as a reference, the PM2.5 concentration, air temperature, and relative humidity had less impact upon the relative bias level compared to using Leckel as a reference. In addition, the high cost of monitoring instruments also poses financial constraints on how many monitoring stations can be deployed. To tackle this issue, this study presents ManPMS whose design is based on that of the USEPA Title 40 Part 50 with slight modifications. The cost to manufacture and assemble the instrument was only 2/3 the price of a typical instrument with similar performance.","PeriodicalId":13547,"journal":{"name":"Instrumentation Science & Technology","volume":"51 1","pages":"660 - 680"},"PeriodicalIF":1.6,"publicationDate":"2023-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43262912","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-15DOI: 10.1080/10739149.2023.2187820
M. Nakkach, R. Nouir, I. Cherni, M. Somaï, F. Daoued, B. Ben Dhaou, F. Boussema, S. Hamzaoui, H. Ghalila
Abstract Primary hypothyroidism is classified as a public health issue by the World Health Organization. The technique for diagnosing hypothyroidism is the measurement of thyroid stimulating hormone (TSH) and thyroxine (FT4). It is necessary to develop new methods that are more accessible, especially for developing countries. The aim of this work is the in-situ use of nail fluorescence for a simple and rapid preliminary diagnosis of primary hypothyroidism. The choice of the nail as biological tissue is justified because nails have a long-term memory, act as a mirror of health, and serve as an early warning system as well as a window of systemic disease. The in situ analysis of the nails of the patients shows good results. Specially, a clear separation was obtained between healthy controls and patients and also between low- and high-level hypothyroidism. Moreover, a strong correlation between fluorescence spectra and TSH values for the population with hypothyroidism was clearly established. Moreover, linear discriminant analysis shows that it is possible to predict the state of test patients after the training of a fraction of the population.
{"title":"In situ characterization of human fingernails by optical front-face fluorescence for the identification of primary hypothyroidism","authors":"M. Nakkach, R. Nouir, I. Cherni, M. Somaï, F. Daoued, B. Ben Dhaou, F. Boussema, S. Hamzaoui, H. Ghalila","doi":"10.1080/10739149.2023.2187820","DOIUrl":"https://doi.org/10.1080/10739149.2023.2187820","url":null,"abstract":"Abstract Primary hypothyroidism is classified as a public health issue by the World Health Organization. The technique for diagnosing hypothyroidism is the measurement of thyroid stimulating hormone (TSH) and thyroxine (FT4). It is necessary to develop new methods that are more accessible, especially for developing countries. The aim of this work is the in-situ use of nail fluorescence for a simple and rapid preliminary diagnosis of primary hypothyroidism. The choice of the nail as biological tissue is justified because nails have a long-term memory, act as a mirror of health, and serve as an early warning system as well as a window of systemic disease. The in situ analysis of the nails of the patients shows good results. Specially, a clear separation was obtained between healthy controls and patients and also between low- and high-level hypothyroidism. Moreover, a strong correlation between fluorescence spectra and TSH values for the population with hypothyroidism was clearly established. Moreover, linear discriminant analysis shows that it is possible to predict the state of test patients after the training of a fraction of the population.","PeriodicalId":13547,"journal":{"name":"Instrumentation Science & Technology","volume":"51 1","pages":"645 - 659"},"PeriodicalIF":1.6,"publicationDate":"2023-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45957027","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-08DOI: 10.1080/10739149.2023.2186429
Xiaoxia Shang, Weifeng Huang, Yueqian Fan, Haijuan Wu, Meijun Wang, L. Chang, Dongfeng Li, Zhihong Li
Abstract Wide-angle X-ray scattering (WAXS) based upon synchrotron radiation is ideal for the in situ study of crystal structural changes during heating at high temperatures. This contribution describes a small furnace for in situ WAXS. The furnace has a wide coverage of scattered/diffracted angle from 0 to 135°, heats samples from room temperature to 1000 °C at 20 °C/min, and is suitable for in situ WAXS and radial distribution function of materials. Temperature calibration and safety verification are provided. The use of the furnace is demonstrated by in situ WAXS for the carbonization of bituminous coal.
{"title":"Small, high temperature, wide-angle furnace for wide-angle X-ray scattering","authors":"Xiaoxia Shang, Weifeng Huang, Yueqian Fan, Haijuan Wu, Meijun Wang, L. Chang, Dongfeng Li, Zhihong Li","doi":"10.1080/10739149.2023.2186429","DOIUrl":"https://doi.org/10.1080/10739149.2023.2186429","url":null,"abstract":"Abstract Wide-angle X-ray scattering (WAXS) based upon synchrotron radiation is ideal for the in situ study of crystal structural changes during heating at high temperatures. This contribution describes a small furnace for in situ WAXS. The furnace has a wide coverage of scattered/diffracted angle from 0 to 135°, heats samples from room temperature to 1000 °C at 20 °C/min, and is suitable for in situ WAXS and radial distribution function of materials. Temperature calibration and safety verification are provided. The use of the furnace is demonstrated by in situ WAXS for the carbonization of bituminous coal.","PeriodicalId":13547,"journal":{"name":"Instrumentation Science & Technology","volume":"51 1","pages":"634 - 644"},"PeriodicalIF":1.6,"publicationDate":"2023-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43056859","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-03DOI: 10.1080/10739149.2023.2184830
A. Yari, A. Shiravandi, S. Moradi
Abstract The design and fabrication of a novel high-sensitivity optical sensor is reported that is highly selective for aqueous Fe3+. 2,6-Dichlorophenolindophenol is embedded in a film by the sol-gel method, which plays the role of the sensing element for Fe3+. The sensor selectively determined Fe(III) ion across a wide dynamic range from 1.70 × 10−8 to 3.31 × 10−3 M at pH 4.4 with a detection limit of 1.22 × 10−8 M. The response of the sensor is fully reversible and is selective for Fe3+. The microporous nature of the stable sol-gel coating provides a unique optical membrane that gives reliable measurements. In addition, the sensor exhibits a long lifetime, long-term stability, and good repeatability. This sensor was successfully used to determine Fe3+ in tap and river water and showed satisfactory results. Graphical abstract
{"title":"Highly selective sol-gel derived optical sensor using 2,6-dichlorophenolindophenol for the sensitive determination of aqueous iron(III)","authors":"A. Yari, A. Shiravandi, S. Moradi","doi":"10.1080/10739149.2023.2184830","DOIUrl":"https://doi.org/10.1080/10739149.2023.2184830","url":null,"abstract":"Abstract The design and fabrication of a novel high-sensitivity optical sensor is reported that is highly selective for aqueous Fe3+. 2,6-Dichlorophenolindophenol is embedded in a film by the sol-gel method, which plays the role of the sensing element for Fe3+. The sensor selectively determined Fe(III) ion across a wide dynamic range from 1.70 × 10−8 to 3.31 × 10−3 M at pH 4.4 with a detection limit of 1.22 × 10−8 M. The response of the sensor is fully reversible and is selective for Fe3+. The microporous nature of the stable sol-gel coating provides a unique optical membrane that gives reliable measurements. In addition, the sensor exhibits a long lifetime, long-term stability, and good repeatability. This sensor was successfully used to determine Fe3+ in tap and river water and showed satisfactory results. Graphical abstract","PeriodicalId":13547,"journal":{"name":"Instrumentation Science & Technology","volume":"51 1","pages":"621 - 633"},"PeriodicalIF":1.6,"publicationDate":"2023-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42900729","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-01DOI: 10.1080/10739149.2023.2180030
Kejie Zhang, Yu-Yang Wang, Qi Wang, Hongya Wang, Yi-Zhuo Qian, Di Zhang, Yan-Yan Xue, Shuai Li, Lei Zhang
Abstract In order to solve the problem that the optical fiber surface plasmon resonance (SPR) sensor is insufficiently sensitive for biomolecule detection, a novel sensing probe was proposed and designed, where the semiconductor material α-Fe2O3 was introduced for the first time. The α-Fe2O3 with high refractive index enhances the electric field and evanescent field depth at the interface between the α-Fe2O3 film and the ambient medium, resulting a sensitive performance. The characteristics of the sensors with gold film and α-Fe2O3 film at different thicknesses were analyzed and compared by finite element method. The thicker the α-Fe2O3 film, the higher the sensitivity. When the thickness of gold nanofilm is 50 nm and the thickness of α-Fe2O3 nanofilm is 20 nm, the highest figure of merit (FOM) is 50.98 RIU−1, corresponding to a sensitivity of 4800 nm/RIU, which is 2.16 times more sensitive than the traditional SPR sensor. In addition, three α-Fe2O3 film thickness-assisted SPR sensors were successfully prepared with the highest sensitivity of 4173.1 nm/RIU, which is nearly two times higher than without the α-Fe2O3 film. The enhancement after introducing α-Fe2O3 nanofilms and its promising application in the field of biosensing were confirmed through experiments and simulations.
{"title":"Sensitive monitoring of refractive index by surface plasmon resonance (SPR) with a gold α-iron (III) oxide thin film","authors":"Kejie Zhang, Yu-Yang Wang, Qi Wang, Hongya Wang, Yi-Zhuo Qian, Di Zhang, Yan-Yan Xue, Shuai Li, Lei Zhang","doi":"10.1080/10739149.2023.2180030","DOIUrl":"https://doi.org/10.1080/10739149.2023.2180030","url":null,"abstract":"Abstract In order to solve the problem that the optical fiber surface plasmon resonance (SPR) sensor is insufficiently sensitive for biomolecule detection, a novel sensing probe was proposed and designed, where the semiconductor material α-Fe2O3 was introduced for the first time. The α-Fe2O3 with high refractive index enhances the electric field and evanescent field depth at the interface between the α-Fe2O3 film and the ambient medium, resulting a sensitive performance. The characteristics of the sensors with gold film and α-Fe2O3 film at different thicknesses were analyzed and compared by finite element method. The thicker the α-Fe2O3 film, the higher the sensitivity. When the thickness of gold nanofilm is 50 nm and the thickness of α-Fe2O3 nanofilm is 20 nm, the highest figure of merit (FOM) is 50.98 RIU−1, corresponding to a sensitivity of 4800 nm/RIU, which is 2.16 times more sensitive than the traditional SPR sensor. In addition, three α-Fe2O3 film thickness-assisted SPR sensors were successfully prepared with the highest sensitivity of 4173.1 nm/RIU, which is nearly two times higher than without the α-Fe2O3 film. The enhancement after introducing α-Fe2O3 nanofilms and its promising application in the field of biosensing were confirmed through experiments and simulations.","PeriodicalId":13547,"journal":{"name":"Instrumentation Science & Technology","volume":"51 1","pages":"558 - 573"},"PeriodicalIF":1.6,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44079652","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-01DOI: 10.1080/10739149.2023.2183406
Jie Lu, Han Gao, Yuanyuan Liu, H. Hu
Abstract The force induced variations of interferences in multimode fiber (MMF) are recognized by the output specklegrams. In this work, the classification of specklegrams is reported to identify the magnitude and position of the force applied on the MMF. The specklegrams from the MMF are recorded by a CCD camera at different force conditions. Because of the large number of transverse modes in the fiber, the specklegrams contains abundant information about the force applied on fiber states. By employing a convolutional neural network (CNN), the classification accuracies of the force position and magnitude on the fiber were 95.91% and 96.67% for test dataset. This reported scheme has the advantages of low cost and simple structure and is suitable to identify specific types of force in distributed sensing applications.
{"title":"Deep learning based force recognition using the specklegrams from multimode fiber","authors":"Jie Lu, Han Gao, Yuanyuan Liu, H. Hu","doi":"10.1080/10739149.2023.2183406","DOIUrl":"https://doi.org/10.1080/10739149.2023.2183406","url":null,"abstract":"Abstract The force induced variations of interferences in multimode fiber (MMF) are recognized by the output specklegrams. In this work, the classification of specklegrams is reported to identify the magnitude and position of the force applied on the MMF. The specklegrams from the MMF are recorded by a CCD camera at different force conditions. Because of the large number of transverse modes in the fiber, the specklegrams contains abundant information about the force applied on fiber states. By employing a convolutional neural network (CNN), the classification accuracies of the force position and magnitude on the fiber were 95.91% and 96.67% for test dataset. This reported scheme has the advantages of low cost and simple structure and is suitable to identify specific types of force in distributed sensing applications.","PeriodicalId":13547,"journal":{"name":"Instrumentation Science & Technology","volume":"51 1","pages":"610 - 620"},"PeriodicalIF":1.6,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45204468","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-27DOI: 10.1080/10739149.2023.2182791
Bao-Anh Hoang, V. Bui, Kien Do Trung, Hang Bui Thu, T. Chu Duc, Tung Thanh Bui, Loc Do Quang
Abstract A modified capacitive-coupled contactless conductivity sensor is proposed and developed for microfluidic flow detection based on the passive wireless inductor-capacitor (LC) technique. The device utilizes rapid prototyping including PolyJet 3D printing and PCB technologies to fabricate the microchannel and the readout inductor through which the conductivity of the fluidic flow is analyzed and foreign objects identified. The system employs an LC resonance circuit to monitor the shift in frequency and the change in the reflection coefficient, thereby estimating the conductivity of the fluidic flow and the appearance of objects. The operating principles were characterized by numerical calculations. The performance was validated by experimental measurements. The results show that the higher the electrical conductivity (i.e. the higher concentration) of the NaCl solution passing through the sensing area, the lower the resonance frequency. The resonance frequency due to the passage of NaCl solution with concentrations of 0.1, 0.5, and 1 M were 225.24, 218.93, and 215.67 MHz, respectively. The influence of the distance between the inductors on the resonance frequency of different solution conductivities has also been studied. The sensor system has high potential in various biomedical and chemical applications, particularly in point-of-care applications where sensor chips can be easily incorporated.
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