D. Burnat, K. Szot-Karpińska, P. Sezemský, M. Janik, M. Koba, J. Niedziółka-Jönsson, Viteszlav Stranak, M. Śmietana
This work describes an experimental study towards label-free sensing of C-reactive protein (CRP) – a protein recognized as a inflammation marker. A multimode optical fiber with a section of its core coated with indium tin oxide (ITO) thin film was used as a sensor. ITO film allows for guiding lossy modes and can simultaneously be used as a transparent electrode for electrochemical measurements. Therefore, optical and electrochemical detection based on a single sensor was possible. Such a dual-domain approach is practical, especially when the results in one of the domains are not accurate enough, which was the case in this work. A case of different functionalization methods of ITO surface was also pointed out. The proposed sensor allows for recognition as low as ng/mL.
{"title":"Opto-electrochemical sensing of C-reactive protein using optical fiber lossy-mode resonance sensor","authors":"D. Burnat, K. Szot-Karpińska, P. Sezemský, M. Janik, M. Koba, J. Niedziółka-Jönsson, Viteszlav Stranak, M. Śmietana","doi":"10.1117/12.2678113","DOIUrl":"https://doi.org/10.1117/12.2678113","url":null,"abstract":"This work describes an experimental study towards label-free sensing of C-reactive protein (CRP) – a protein recognized as a inflammation marker. A multimode optical fiber with a section of its core coated with indium tin oxide (ITO) thin film was used as a sensor. ITO film allows for guiding lossy modes and can simultaneously be used as a transparent electrode for electrochemical measurements. Therefore, optical and electrochemical detection based on a single sensor was possible. Such a dual-domain approach is practical, especially when the results in one of the domains are not accurate enough, which was the case in this work. A case of different functionalization methods of ITO surface was also pointed out. The proposed sensor allows for recognition as low as ng/mL.","PeriodicalId":424244,"journal":{"name":"European Workshop on Optical Fibre Sensors","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116229548","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yue Qin, Dingbang Ma, Y. Wang, C. Liao, Yiping Wang
A probe-type all-fiber ultraviolet photodetector is proposed in this paper. A ZnO microwire is fixed on the end facet of a single-mode fiber through a glass tube with specific diameter to form a Fabry-Pérot interferometer. With this all-fiber structure, fast-response ultraviolet detection can be realized in an all-optical scheme. Since the refractive index of ZnO microwire increases under the illumination of ultraviolet, interference wavelengths of abovementioned device redshifts with the increase of ultraviolet light intensity. By employing a continuous 266-nm laser beam and chopping method, the sensitivity is obtained to be 0.268 nm/(W·cm-2 ) and the response time is only 0.56 ms. To be more specifically, the response speed of the device is further explored by a 266-nm pulsed laser, and the response time of the device is measured to be only 13 μs. The proposed device provides a new idea for the next generation of high-performance ultraviolet photodetectors and may find potential applications in the future.
{"title":"A probe-type fiber optic ultraviolet photodetector","authors":"Yue Qin, Dingbang Ma, Y. Wang, C. Liao, Yiping Wang","doi":"10.1117/12.2681883","DOIUrl":"https://doi.org/10.1117/12.2681883","url":null,"abstract":"A probe-type all-fiber ultraviolet photodetector is proposed in this paper. A ZnO microwire is fixed on the end facet of a single-mode fiber through a glass tube with specific diameter to form a Fabry-Pérot interferometer. With this all-fiber structure, fast-response ultraviolet detection can be realized in an all-optical scheme. Since the refractive index of ZnO microwire increases under the illumination of ultraviolet, interference wavelengths of abovementioned device redshifts with the increase of ultraviolet light intensity. By employing a continuous 266-nm laser beam and chopping method, the sensitivity is obtained to be 0.268 nm/(W·cm-2 ) and the response time is only 0.56 ms. To be more specifically, the response speed of the device is further explored by a 266-nm pulsed laser, and the response time of the device is measured to be only 13 μs. The proposed device provides a new idea for the next generation of high-performance ultraviolet photodetectors and may find potential applications in the future.","PeriodicalId":424244,"journal":{"name":"European Workshop on Optical Fibre Sensors","volume":"286 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123447994","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Wavelength scanning coherent optical time domain reflectometer (WS-COTDR) is a good candidate to spatially resolve the environmental information at comparatively low frequency. This paper reveals it can also work as a traditional optical time domain reflectometer (OTDR) to identify Fresnel reflection by averaging the obtained signal over the wavelength scanning range. Simultaneous distributed vibration sensing and a traditional OTDR measurement are experimentally demonstrated using the WS-COTDR system.
{"title":"Dual functionality of wavelength scanning coherent optical time domain reflectometer","authors":"Xin Lu, K. Hicke, K. Krebber","doi":"10.1117/12.2678098","DOIUrl":"https://doi.org/10.1117/12.2678098","url":null,"abstract":"Wavelength scanning coherent optical time domain reflectometer (WS-COTDR) is a good candidate to spatially resolve the environmental information at comparatively low frequency. This paper reveals it can also work as a traditional optical time domain reflectometer (OTDR) to identify Fresnel reflection by averaging the obtained signal over the wavelength scanning range. Simultaneous distributed vibration sensing and a traditional OTDR measurement are experimentally demonstrated using the WS-COTDR system.","PeriodicalId":424244,"journal":{"name":"European Workshop on Optical Fibre Sensors","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117070497","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Rodolfo Martínez-Manuel, Jonathan Esquivel-Hernández, Luis M. Valentín-Coronado, M. Shlyagin, S. Larochelle
An approach for directional bending monitoring based on a multimode fiber and a machine learning algorithm is presented. The sensor if formed by splicing a single mode fiber to a multimode elliptical-core fiber. Using this elliptical-core fiber, multimode interference generates an interferogram with non-uniform amplitude and non-periodic shape. These characteristics are important to process the sensing signal using a machine learning algorithm. The machine learning algorithm implemented is the well-known random forest algorithm. In the reported experiments, the fiber is bended in different directions and different magnitudes of bending, generating a specific interferogram in each position, then each bending position is identified by the random forest algorithm. Once the position is identified, the trajectory of the sensor can be calculated. Experimental demonstration for directional bending monitoring, based on a machine learning algorithm, is presented.
{"title":"Directional bending monitoring using a multimode elliptical-core fiber and a machine learning algorithm","authors":"Rodolfo Martínez-Manuel, Jonathan Esquivel-Hernández, Luis M. Valentín-Coronado, M. Shlyagin, S. Larochelle","doi":"10.1117/12.2678451","DOIUrl":"https://doi.org/10.1117/12.2678451","url":null,"abstract":"An approach for directional bending monitoring based on a multimode fiber and a machine learning algorithm is presented. The sensor if formed by splicing a single mode fiber to a multimode elliptical-core fiber. Using this elliptical-core fiber, multimode interference generates an interferogram with non-uniform amplitude and non-periodic shape. These characteristics are important to process the sensing signal using a machine learning algorithm. The machine learning algorithm implemented is the well-known random forest algorithm. In the reported experiments, the fiber is bended in different directions and different magnitudes of bending, generating a specific interferogram in each position, then each bending position is identified by the random forest algorithm. Once the position is identified, the trajectory of the sensor can be calculated. Experimental demonstration for directional bending monitoring, based on a machine learning algorithm, is presented.","PeriodicalId":424244,"journal":{"name":"European Workshop on Optical Fibre Sensors","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126489153","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
E. Grantzioti, N. Samartzis, K. Bhorkar, S. Pissadakis, S. Yannopoulos, M. Konstantaki
We describe an optical fiber sensor for detection of ammonia vapors employing a fluorinated graphene-like overlayer on a tilted Bragg grating. Exploiting the laser-mediated explosive synthesis and transfer (LEST) of graphene (Gr) flakes a thin film of few-layer turbostratic graphene flakes doped with F atoms (~ 3.3 at. %) are deposited on the fiber at the location of the grating. The response of the sensor was investigated for NH4OH vapors while for reference, the effect of H2O was also monitored at identical conditions. Under increasing vapor pressure of NH4OH, wavelength shift is recorded not only in the cladding modes but also for the fundamental Bragg mode, indicating that the effect is not solely due to changes in the optical parameters of the overlayer. The monitored wavelength shift is initially negative turning to positive when vapor saturation is reached. Furthermore, there is a distinct difference in the magnitude of the monitored shifts with the higher order mode exhibiting 2.5x higher values compared to the Bragg mode. The study is ongoing and will also include overlayers of pure LEST Gr and LEST Gr decorated with Six nanoparticles.
{"title":"Tilted optical fiber Bragg grating with fluorinated graphene-like overlayer for ammonia detection","authors":"E. Grantzioti, N. Samartzis, K. Bhorkar, S. Pissadakis, S. Yannopoulos, M. Konstantaki","doi":"10.1117/12.2678525","DOIUrl":"https://doi.org/10.1117/12.2678525","url":null,"abstract":"We describe an optical fiber sensor for detection of ammonia vapors employing a fluorinated graphene-like overlayer on a tilted Bragg grating. Exploiting the laser-mediated explosive synthesis and transfer (LEST) of graphene (Gr) flakes a thin film of few-layer turbostratic graphene flakes doped with F atoms (~ 3.3 at. %) are deposited on the fiber at the location of the grating. The response of the sensor was investigated for NH4OH vapors while for reference, the effect of H2O was also monitored at identical conditions. Under increasing vapor pressure of NH4OH, wavelength shift is recorded not only in the cladding modes but also for the fundamental Bragg mode, indicating that the effect is not solely due to changes in the optical parameters of the overlayer. The monitored wavelength shift is initially negative turning to positive when vapor saturation is reached. Furthermore, there is a distinct difference in the magnitude of the monitored shifts with the higher order mode exhibiting 2.5x higher values compared to the Bragg mode. The study is ongoing and will also include overlayers of pure LEST Gr and LEST Gr decorated with Six nanoparticles.","PeriodicalId":424244,"journal":{"name":"European Workshop on Optical Fibre Sensors","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123000933","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. Iele, A. Ricciardi, C. Pecorella, A. Cirillo, F. Ficuciello, B. Siciliano, R. La Rocca, V. Mirone, M. Consales, A. Cusano
We developed a miniaturized optical probe, based on a customized Fiber Bragg Grating, for mechanical characterization of biological tissues with sub-millimeter spatial resolution. The probe is integrated inside a metallic cannula (16 gauge) used for clinical applications, and it is driven by a robotic arm (KUKA LBR Med 7). The optical sensor has a resolution of less than 1 mN and measures the force on controlled tissue indentations. The functionality of the sensor was assessed by means of different tests carried out on real prostates obtained from radically surgeries of patients at different stages of the carcinoma (Gleason score from 6 to 8). Specifically, in this work, we demonstrate that our system provides results that are on line with to the biopsy analysis performed before and the surgery. Our findings lay the foundation for the development of compact optical fiber probes, with size compatible with needle/catheter, able to perform in vivo mechanical characterizations of the prostatic tissue with high sensitivity and spatial resolution.
我们开发了一种基于定制光纤布拉格光栅的小型化光学探针，用于亚毫米空间分辨率的生物组织力学表征。该探头集成在用于临床应用的金属套管(16号)内，由机械臂(KUKA LBR Med 7)驱动。光学传感器的分辨率小于1 mN，可测量受控制组织压痕上的力。传感器的功能是通过对不同阶段癌症患者进行根根性手术获得的真实前列腺进行的不同测试来评估的(Gleason评分从6到8)。具体来说，在这项工作中，我们证明了我们的系统提供的结果与术前和手术前进行的活检分析一致。我们的研究结果为紧凑型光纤探针的发展奠定了基础，其尺寸与针/导管兼容，能够以高灵敏度和空间分辨率进行前列腺组织的体内力学表征。
{"title":"Optical fiber probe for prostate cancer screening: ex vivo study","authors":"A. Iele, A. Ricciardi, C. Pecorella, A. Cirillo, F. Ficuciello, B. Siciliano, R. La Rocca, V. Mirone, M. Consales, A. Cusano","doi":"10.1117/12.2678083","DOIUrl":"https://doi.org/10.1117/12.2678083","url":null,"abstract":"We developed a miniaturized optical probe, based on a customized Fiber Bragg Grating, for mechanical characterization of biological tissues with sub-millimeter spatial resolution. The probe is integrated inside a metallic cannula (16 gauge) used for clinical applications, and it is driven by a robotic arm (KUKA LBR Med 7). The optical sensor has a resolution of less than 1 mN and measures the force on controlled tissue indentations. The functionality of the sensor was assessed by means of different tests carried out on real prostates obtained from radically surgeries of patients at different stages of the carcinoma (Gleason score from 6 to 8). Specifically, in this work, we demonstrate that our system provides results that are on line with to the biopsy analysis performed before and the surgery. Our findings lay the foundation for the development of compact optical fiber probes, with size compatible with needle/catheter, able to perform in vivo mechanical characterizations of the prostatic tissue with high sensitivity and spatial resolution.","PeriodicalId":424244,"journal":{"name":"European Workshop on Optical Fibre Sensors","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123215509","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
T. Elsmann, A. Lorenz, K. Schröder, T. Habisreuther
Sapphire fiber Bragg gratings (SFBG) were used for temperature diagnosis of a commercial inductive heated furnace of a fiber draw tower. In a fiber preform temperature gradients > 10K/mm were detected. In the temperature range from 1000°C to 1900°C the measured temperature inside the furnace is about 140K below the control temperature detected by a pyrometer on a spot of the heating element. The dependence of applied temperature on the furnace heating power was derived that can allow furnace control without pyrometer and therefore extending operation range below 1000°C. No degradation of SFBG was observed.
{"title":"Draw tower furnace diagnostics applying a sapphire fiber Bragg grating probe","authors":"T. Elsmann, A. Lorenz, K. Schröder, T. Habisreuther","doi":"10.1117/12.2679822","DOIUrl":"https://doi.org/10.1117/12.2679822","url":null,"abstract":"Sapphire fiber Bragg gratings (SFBG) were used for temperature diagnosis of a commercial inductive heated furnace of a fiber draw tower. In a fiber preform temperature gradients > 10K/mm were detected. In the temperature range from 1000°C to 1900°C the measured temperature inside the furnace is about 140K below the control temperature detected by a pyrometer on a spot of the heating element. The dependence of applied temperature on the furnace heating power was derived that can allow furnace control without pyrometer and therefore extending operation range below 1000°C. No degradation of SFBG was observed.","PeriodicalId":424244,"journal":{"name":"European Workshop on Optical Fibre Sensors","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127160968","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. Soriano-Amat, P. Guay, H. Martins, S. Martín-López, M. González-Herráez, J. Genest, M. Fernández-Ruiz
Time-expanded phase-sensitive (TE-φ )OTDR is a distributed optical fiber sensing (DOFS) technique that takes advantage of the dual-frequency comb technology to offer distributed, dynamic, and high-spatial resolution measurements. The performance delivered by this recent approach is unmatched by any other DOFS, combining the high resolution of OFDR with the potential for long range and fast sampling of φ OTDR. In this contribution, we present an optimized TE-φ OTDR scheme with important improvements with respect to the traditional one. In particular, the new architecture uses electrooptical phase modulation instead of intensity modulation, increasing the energy-efficiency. Additionally, it employs an optical hybrid to double the spectral efficiency of the system, which in practical terms results in doubling the spatial resolution for the same interrogating comb bandwidth. The proposed architecture has been experimentally validated through a scheme providing 5 mm of spatial resolution, 80 m of range and 70 Hz sampling rate with a simple, compact and low-cost setup using field-programmable gate arrays (FPGA) and relatively low bandwidth photodetection (2 MHz).
{"title":"Sub-centimeter spatial resolution dynamic strain sensing using time-expanded ΦOTDR","authors":"M. Soriano-Amat, P. Guay, H. Martins, S. Martín-López, M. González-Herráez, J. Genest, M. Fernández-Ruiz","doi":"10.1117/12.2678093","DOIUrl":"https://doi.org/10.1117/12.2678093","url":null,"abstract":"Time-expanded phase-sensitive (TE-φ )OTDR is a distributed optical fiber sensing (DOFS) technique that takes advantage of the dual-frequency comb technology to offer distributed, dynamic, and high-spatial resolution measurements. The performance delivered by this recent approach is unmatched by any other DOFS, combining the high resolution of OFDR with the potential for long range and fast sampling of φ OTDR. In this contribution, we present an optimized TE-φ OTDR scheme with important improvements with respect to the traditional one. In particular, the new architecture uses electrooptical phase modulation instead of intensity modulation, increasing the energy-efficiency. Additionally, it employs an optical hybrid to double the spectral efficiency of the system, which in practical terms results in doubling the spatial resolution for the same interrogating comb bandwidth. The proposed architecture has been experimentally validated through a scheme providing 5 mm of spatial resolution, 80 m of range and 70 Hz sampling rate with a simple, compact and low-cost setup using field-programmable gate arrays (FPGA) and relatively low bandwidth photodetection (2 MHz).","PeriodicalId":424244,"journal":{"name":"European Workshop on Optical Fibre Sensors","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128113567","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
H. Alhalaby, M. Principe, H. Zaraket, P. Vaiano, A. Aliberti, G. Quero, A. Crescitelli, V. Di Meo, E. Esposito, M. Consales, A. Cusano
The need for miniaturized biological sensors which can be easily integrated into medical needles and catheters for in vivo liquid biopsies with ever-increasing performances has stimulated the interest of researchers in Lab-on-Fiber (LOF) technology. In this framework, the integration of Metasurfaces (MSs) on the tip of the optical fiber (Optical Fiber Meta- Tip, OFMT) has represented a major breakthrough. Indeed, we showed that a suitably designed plasmonic OFMT biosensor significantly outperforms standard plasmonic ones due to the advanced light wave manipulation of MSs. Here, to further improve the sensing performances, we propose a novel class of LOF optrodes for labelled biosensing based on dielectric fluorescence enhancing OFMT. We envision a single fiber probe with integrated a Silicon MS on its tip as a light coupled substrate that illuminates the sample and simultaneously collects the enhanced emission from the dye molecules labeling the biological target. We present a numerical environment to compute the fluorescence enhancement factor collected by a multi-mode-fiber, when on its tip a Silicon MS is laid, consisting of an array of cylindrical nanoantennas. According to the numerical results, a suitable design of the dielectric MS allows for a fluorescence enhancement up to three orders of magnitudes. Moreover, a feasibility study is carried out to verify the possibility to fabricate the designed MSs on the termination of multimode optical fibers using electron beam lithography followed by reactive ion etching. This work provides the main guidelines for the development of advanced LOF devices based on the fluorescence enhancement for labeled biosensing.
{"title":"Lab-on-fiber optrodes based on all-dielectric fluorescence enhancing metasurfaces","authors":"H. Alhalaby, M. Principe, H. Zaraket, P. Vaiano, A. Aliberti, G. Quero, A. Crescitelli, V. Di Meo, E. Esposito, M. Consales, A. Cusano","doi":"10.1117/12.2679369","DOIUrl":"https://doi.org/10.1117/12.2679369","url":null,"abstract":"The need for miniaturized biological sensors which can be easily integrated into medical needles and catheters for in vivo liquid biopsies with ever-increasing performances has stimulated the interest of researchers in Lab-on-Fiber (LOF) technology. In this framework, the integration of Metasurfaces (MSs) on the tip of the optical fiber (Optical Fiber Meta- Tip, OFMT) has represented a major breakthrough. Indeed, we showed that a suitably designed plasmonic OFMT biosensor significantly outperforms standard plasmonic ones due to the advanced light wave manipulation of MSs. Here, to further improve the sensing performances, we propose a novel class of LOF optrodes for labelled biosensing based on dielectric fluorescence enhancing OFMT. We envision a single fiber probe with integrated a Silicon MS on its tip as a light coupled substrate that illuminates the sample and simultaneously collects the enhanced emission from the dye molecules labeling the biological target. We present a numerical environment to compute the fluorescence enhancement factor collected by a multi-mode-fiber, when on its tip a Silicon MS is laid, consisting of an array of cylindrical nanoantennas. According to the numerical results, a suitable design of the dielectric MS allows for a fluorescence enhancement up to three orders of magnitudes. Moreover, a feasibility study is carried out to verify the possibility to fabricate the designed MSs on the termination of multimode optical fibers using electron beam lithography followed by reactive ion etching. This work provides the main guidelines for the development of advanced LOF devices based on the fluorescence enhancement for labeled biosensing.","PeriodicalId":424244,"journal":{"name":"European Workshop on Optical Fibre Sensors","volume":"103 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121254639","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
R. Zahoor, E. Catalano, R. Vallifuoco, L. Zeni, A. Minardo
In this paper, we make use of a phase-sensitive time domain reflectometry (phi-OTDR) sensor with 60-cm spatial resolution to detect the Lamb waves generated by a piezo-ceramic actuator in an aluminum plate. Furthermore, a machine learning algorithm based on Support Vector Machine (SVM) classifiers was employed for damage localization. We show that SVMs are able to identify the characteristics in Lamb wave signals that may be linked to damage location. This study makes full use of the rich information provided by the phi-OTDR sensor, extracting damaged data from diverse damage spots. The results indicate that the proposed technique has the potential to identify and locate damages in thin-plate structures.
{"title":"Damage detection in an aluminum plate through a phi-OTDR sensor and support vector machines","authors":"R. Zahoor, E. Catalano, R. Vallifuoco, L. Zeni, A. Minardo","doi":"10.1117/12.2678095","DOIUrl":"https://doi.org/10.1117/12.2678095","url":null,"abstract":"In this paper, we make use of a phase-sensitive time domain reflectometry (phi-OTDR) sensor with 60-cm spatial resolution to detect the Lamb waves generated by a piezo-ceramic actuator in an aluminum plate. Furthermore, a machine learning algorithm based on Support Vector Machine (SVM) classifiers was employed for damage localization. We show that SVMs are able to identify the characteristics in Lamb wave signals that may be linked to damage location. This study makes full use of the rich information provided by the phi-OTDR sensor, extracting damaged data from diverse damage spots. The results indicate that the proposed technique has the potential to identify and locate damages in thin-plate structures.","PeriodicalId":424244,"journal":{"name":"European Workshop on Optical Fibre Sensors","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116001689","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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