Anuradha Rout, Zhe Wang, Zhuochen Wang, Y. Semenova
A new tunable fiber laser structure based on an erbium-doped fiber ring laser (FRL) and a polymer-based microbottle resonator (PMBR) as the wavelength selective filter is proposed and demonstrated. The tunability of the laser output in response to axial strain of up to 253.6 με applied to the PMBR is demonstrated experimentally. When the strain was applied to the PMBR’s long axis, the central lasing wavelength shifted towards shorter wavelengths in a linear fashion. The laser's strain sensitivity was determined to be 0.69 pm/με. The proposed strain-tunable PMBR laser offers the advantages of simple structure, low cost, robust performance, and has the potential for applications in sensing and tunable micro lasers.
{"title":"Tunable erbium-doped fiber ring laser with a polymer micro bottle resonator","authors":"Anuradha Rout, Zhe Wang, Zhuochen Wang, Y. Semenova","doi":"10.1117/12.2680770","DOIUrl":"https://doi.org/10.1117/12.2680770","url":null,"abstract":"A new tunable fiber laser structure based on an erbium-doped fiber ring laser (FRL) and a polymer-based microbottle resonator (PMBR) as the wavelength selective filter is proposed and demonstrated. The tunability of the laser output in response to axial strain of up to 253.6 με applied to the PMBR is demonstrated experimentally. When the strain was applied to the PMBR’s long axis, the central lasing wavelength shifted towards shorter wavelengths in a linear fashion. The laser's strain sensitivity was determined to be 0.69 pm/με. The proposed strain-tunable PMBR laser offers the advantages of simple structure, low cost, robust performance, and has the potential for applications in sensing and tunable micro lasers.","PeriodicalId":424244,"journal":{"name":"European Workshop on Optical Fibre Sensors","volume":"14 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":"131555199","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. Deliancourt, A. Lerner, K. Achour, A. Jolly, J. Le Pallec, A. Quet, C. Guerin, S. Hulin, G. Laffont
Pairs of arrays of point-by-point fiber Bragg Gratings written with a femtosecond laser were anchored with K-type thermocouple within an asymmetrical titanium substrate. Three anchoring methods were used, including silica based, graphite based glue commercially available as well as Yttria Stabilized Zirconia deposited by Atmospheric Plasma Spraying. The optical fibers were first recoated with an inorganic coating, specifically developed to resist to high temperatures above 800°C. The titanium plate was exposed to an intense heat flow delivered by tungsten halogen lamps to reach temperature of around 800°C. High temperature and strain measurements was performed in situ with a relative error of less than 10% at 800°C.
{"title":"High temperature measurements using femtosecond written FBGs of a titanium substrate under intense heat flow","authors":"E. Deliancourt, A. Lerner, K. Achour, A. Jolly, J. Le Pallec, A. Quet, C. Guerin, S. Hulin, G. Laffont","doi":"10.1117/12.2678402","DOIUrl":"https://doi.org/10.1117/12.2678402","url":null,"abstract":"Pairs of arrays of point-by-point fiber Bragg Gratings written with a femtosecond laser were anchored with K-type thermocouple within an asymmetrical titanium substrate. Three anchoring methods were used, including silica based, graphite based glue commercially available as well as Yttria Stabilized Zirconia deposited by Atmospheric Plasma Spraying. The optical fibers were first recoated with an inorganic coating, specifically developed to resist to high temperatures above 800°C. The titanium plate was exposed to an intense heat flow delivered by tungsten halogen lamps to reach temperature of around 800°C. High temperature and strain measurements was performed in situ with a relative error of less than 10% at 800°C.","PeriodicalId":424244,"journal":{"name":"European Workshop on Optical Fibre Sensors","volume":"93 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":"132695365","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}
James A. Ell, J. Bradbury, R. Correia, S. Korposh, B. Hayes-Gill, S. Morgan
Compression therapy is a widespread clinical treatment requiring the application of therapeutic pressures to the lower limbs of patients using bandages or hosiery. The amount of pressure applied to the limb is critical in promoting patient recovery. Initial results from a fibre optic cantilever pressure sensor incorporating Fibre Bragg Gratings (FBGs) are reported. Calibration and bandaging experiments performed on a phantom leg model are presented, alongside a comparison to a reference sub-bandage pressure monitor. The proposed sensor shows increased pressure sensitivity in comparison to a previously reported design in which an FBG is encapsulated in a polymer and shows potential for application in the context of healthcare wearables.
{"title":"Cantilever optical fibre sensor for compression therapy applications","authors":"James A. Ell, J. Bradbury, R. Correia, S. Korposh, B. Hayes-Gill, S. Morgan","doi":"10.1117/12.2678120","DOIUrl":"https://doi.org/10.1117/12.2678120","url":null,"abstract":"Compression therapy is a widespread clinical treatment requiring the application of therapeutic pressures to the lower limbs of patients using bandages or hosiery. The amount of pressure applied to the limb is critical in promoting patient recovery. Initial results from a fibre optic cantilever pressure sensor incorporating Fibre Bragg Gratings (FBGs) are reported. Calibration and bandaging experiments performed on a phantom leg model are presented, alongside a comparison to a reference sub-bandage pressure monitor. The proposed sensor shows increased pressure sensitivity in comparison to a previously reported design in which an FBG is encapsulated in a polymer and shows potential for application in the context of healthcare wearables.","PeriodicalId":424244,"journal":{"name":"European Workshop on Optical Fibre Sensors","volume":"89 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":"133594974","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}
R. Pérez-Herrera, Liliana Soares, S. Novais, O. Frazão, Susana O. Silva
In this work, an erbium-doped fiber ring cavity based on a 3dB optical coupler for refractive index measurements is presented and experimentally verified. This interrogation system, based on a 1 x 2 optical coupler, uses one of these output ports to increase the reflected optical power by means of a fiber Bragg Grating (FBG), used as a reflector. Moreover, the other output port is used as a refractive index sensing head. A spectral analysis of this interrogator system as well as a fiber cavity ring refractive index sensor characterization are carried out. Finally, an experimental comparison of the refractive index sensor range when the 3dB coupler is replace by a 1x3 one is also presented.
{"title":"Erbium-doped fiber ring cavity for the measurement of refractive index variations","authors":"R. Pérez-Herrera, Liliana Soares, S. Novais, O. Frazão, Susana O. Silva","doi":"10.1117/12.2678101","DOIUrl":"https://doi.org/10.1117/12.2678101","url":null,"abstract":"In this work, an erbium-doped fiber ring cavity based on a 3dB optical coupler for refractive index measurements is presented and experimentally verified. This interrogation system, based on a 1 x 2 optical coupler, uses one of these output ports to increase the reflected optical power by means of a fiber Bragg Grating (FBG), used as a reflector. Moreover, the other output port is used as a refractive index sensing head. A spectral analysis of this interrogator system as well as a fiber cavity ring refractive index sensor characterization are carried out. Finally, an experimental comparison of the refractive index sensor range when the 3dB coupler is replace by a 1x3 one is also presented.","PeriodicalId":424244,"journal":{"name":"European Workshop on Optical Fibre Sensors","volume":"2005 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":"125618224","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}
V. Hernández-Ambato, D. Barrera, Yannick Mathieu, L. Sauvanaud, S. Sales
We propose a novel cryogenic liquid level sensor based on a long-period grating inscribed in one of the external cores of a multicore optical fibre. The proposed device has a small grating period to improve the sensitivity to external refractive index changes while reducing the temperature sensitivity. We compare the results obtained with an LPG inscribed in a single-core fibre, demonstrating that the optical spectrum of our device is not divided into two different resonances and shifts smoothly towards shorter wavelengths as the relative liquid level increases. The sensitivity of the proposed level sensor when measuring liquid nitrogen is -0.772 nm/cm.
{"title":"Cryogenic liquid level sensor based on long period grating","authors":"V. Hernández-Ambato, D. Barrera, Yannick Mathieu, L. Sauvanaud, S. Sales","doi":"10.1117/12.2679109","DOIUrl":"https://doi.org/10.1117/12.2679109","url":null,"abstract":"We propose a novel cryogenic liquid level sensor based on a long-period grating inscribed in one of the external cores of a multicore optical fibre. The proposed device has a small grating period to improve the sensitivity to external refractive index changes while reducing the temperature sensitivity. We compare the results obtained with an LPG inscribed in a single-core fibre, demonstrating that the optical spectrum of our device is not divided into two different resonances and shifts smoothly towards shorter wavelengths as the relative liquid level increases. The sensitivity of the proposed level sensor when measuring liquid nitrogen is -0.772 nm/cm.","PeriodicalId":424244,"journal":{"name":"European Workshop on Optical Fibre Sensors","volume":"24 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":"114334737","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}
L. Ciaccheri, B. Adinolfi, A. Mencaglia, A. Mignani
A smartphone has been characterized as colorimeter, using both the built-in camera and a clip-on dispersive grating. Certified colorimetric samples provided by Labsphere® were considered as test samples. Color measurements directly performed by means of the smartphone camera only were obtained using the “RGB Detector” App, downloaded from the Google Play Store. More precise measurements were obtained by means of the commercially available GoSpectro grating and related App. In both cases, in order to quantify the reliability and sensitivity of smartphone-based color measurements, the CIELab color difference ΔE between the certified and smartphone-measured colors were calculated, and are reported in this paper. Also, as an example of practical application of interest for the textile industry, several samples of cloth fabrics with a palette of the most common colors were analyzed, and the comparison with the certified color values are presented.
智能手机被称为色度计，它使用内置摄像头和夹式色散光栅。Labsphere®提供的认证比色样品被视为测试样品。仅通过智能手机相机直接进行的颜色测量使用从Google Play Store下载的“RGB检测器”应用程序获得。通过市售的GoSpectro光栅和相关应用程序获得了更精确的测量结果。在这两种情况下，为了量化基于智能手机的颜色测量的可靠性和灵敏度，计算了认证和智能手机测量颜色之间的CIELab色差ΔE，并在本文中进行了报道。此外，作为纺织工业实际应用的一个例子，分析了几种具有最常见颜色调色板的布料样品，并与认证颜色值进行了比较。
{"title":"The smartphone for colorimetry: performance characterization","authors":"L. Ciaccheri, B. Adinolfi, A. Mencaglia, A. Mignani","doi":"10.1117/12.2678411","DOIUrl":"https://doi.org/10.1117/12.2678411","url":null,"abstract":"A smartphone has been characterized as colorimeter, using both the built-in camera and a clip-on dispersive grating. Certified colorimetric samples provided by Labsphere® were considered as test samples. Color measurements directly performed by means of the smartphone camera only were obtained using the “RGB Detector” App, downloaded from the Google Play Store. More precise measurements were obtained by means of the commercially available GoSpectro grating and related App. In both cases, in order to quantify the reliability and sensitivity of smartphone-based color measurements, the CIELab color difference ΔE between the certified and smartphone-measured colors were calculated, and are reported in this paper. Also, as an example of practical application of interest for the textile industry, several samples of cloth fabrics with a palette of the most common colors were analyzed, and the comparison with the certified color values are presented.","PeriodicalId":424244,"journal":{"name":"European Workshop on Optical Fibre Sensors","volume":"19 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":"125413503","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}
The noise conversion relationships of relative intensity noise (RIN) and shot noise in a broadband source sensing system using a 3×3 coupler are studied. RIN and shot noise are converted into the phase noise floor through the arctangent demodulation scheme and the performances of the 3×3 coupler. To quantify the contribution of RIN and shot noise, we analyzed the equivalent phase noise induced by RIN and shot noise. The theory and experiment demonstrate that the equivalent phase noise of RIN is related to the correlation of three RINs and the initial phase, and the shot noise is related to the initial phase.
{"title":"Equivalent phase noise analysis in broadband source sensing system using a 3×3 coupler","authors":"Huicong Li, Wenzhu Huang, Wentao Zhang","doi":"10.1117/12.2679485","DOIUrl":"https://doi.org/10.1117/12.2679485","url":null,"abstract":"The noise conversion relationships of relative intensity noise (RIN) and shot noise in a broadband source sensing system using a 3×3 coupler are studied. RIN and shot noise are converted into the phase noise floor through the arctangent demodulation scheme and the performances of the 3×3 coupler. To quantify the contribution of RIN and shot noise, we analyzed the equivalent phase noise induced by RIN and shot noise. The theory and experiment demonstrate that the equivalent phase noise of RIN is related to the correlation of three RINs and the initial phase, and the shot noise is related to the initial phase.","PeriodicalId":424244,"journal":{"name":"European Workshop on Optical Fibre Sensors","volume":"2 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":"125518109","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}
Ana Sofia Assunção, M. Vidal, M. Loyez, C. Caucheteur, F. Costa, J. Mesquita-Bastos, S. Pereira, C. Leitão
Plasmonic optical fiber sensors have been investigated for biosensing purposes as they provide miniaturized devices with fast, label-free and highly sensitive responses. This study explores gold-coated optical fiber tip sensors, based on multimode fibers of 200 and 600 μm core diameters, for the detection of the heart failure biomarker N-terminal pro-Brain natriuretic peptide (NT-proBNP). The obtained results demonstrated that the 200 μm core tip reached the highest refractometric sensitivity, between 1158.54 and 2750.34 nm/RIU, and that both sensors responded to NT-proBNP concentrations in a range that included the values of clinical interest for the diagnosis of this cardiovascular disease, which correspond to 0.125 ng/mL and 0.300 ng/mL.
{"title":"Unclad optical fiber tips for plasmonic biosensing of heart failure biomarker","authors":"Ana Sofia Assunção, M. Vidal, M. Loyez, C. Caucheteur, F. Costa, J. Mesquita-Bastos, S. Pereira, C. Leitão","doi":"10.1117/12.2678368","DOIUrl":"https://doi.org/10.1117/12.2678368","url":null,"abstract":"Plasmonic optical fiber sensors have been investigated for biosensing purposes as they provide miniaturized devices with fast, label-free and highly sensitive responses. This study explores gold-coated optical fiber tip sensors, based on multimode fibers of 200 and 600 μm core diameters, for the detection of the heart failure biomarker N-terminal pro-Brain natriuretic peptide (NT-proBNP). The obtained results demonstrated that the 200 μm core tip reached the highest refractometric sensitivity, between 1158.54 and 2750.34 nm/RIU, and that both sensors responded to NT-proBNP concentrations in a range that included the values of clinical interest for the diagnosis of this cardiovascular disease, which correspond to 0.125 ng/mL and 0.300 ng/mL.","PeriodicalId":424244,"journal":{"name":"European Workshop on Optical Fibre Sensors","volume":"67 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":"122754138","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. Lobry, Corentin Guyot, D. Kinet, K. Chah, C. Caucheteur
Plasmonic tilted fiber Bragg gratings (TFBGs) are well-suited for accurate, rapid and minimally-invasive biosensing. They present a very dense transmitted amplitude spectrum of narrowband cladding mode resonances (full width at half maximum < 1 nm). This response is commonly demodulated using highly-resolved interrogators (wavelength resolution < 10 pm). This work investigates the possibility of reading-out the amplitude spectrum of a gold-coated TFBG by using a coarsely resolved spectrometer (166 pm). A refractometric sensitivity of 2656 nm/RIU has been observed thanks to a refined analysis of the spectral content which has led to the development a more efficient signal processing. This value represents a fivefold enhancement compared to previously reported read-out methods. Biosensing has been successfully achieved with gold-coated TFBGs used in reflection mode for the detection of insulin, with specific antibodies grafted on the gold surface. Our experimental study is an advance towards an industrialization of the FBG technology, as it opens the way to rapid parallel biodetection, benefiting from the multiple sensing channels (up to 64) of the interrogator as well as its high processing speed (repetition rate up to 3 kHz).
{"title":"Plasmonic tilted FBG biosensor read-out with a 512-pixel spectrometer","authors":"M. Lobry, Corentin Guyot, D. Kinet, K. Chah, C. Caucheteur","doi":"10.1117/12.2678330","DOIUrl":"https://doi.org/10.1117/12.2678330","url":null,"abstract":"Plasmonic tilted fiber Bragg gratings (TFBGs) are well-suited for accurate, rapid and minimally-invasive biosensing. They present a very dense transmitted amplitude spectrum of narrowband cladding mode resonances (full width at half maximum < 1 nm). This response is commonly demodulated using highly-resolved interrogators (wavelength resolution < 10 pm). This work investigates the possibility of reading-out the amplitude spectrum of a gold-coated TFBG by using a coarsely resolved spectrometer (166 pm). A refractometric sensitivity of 2656 nm/RIU has been observed thanks to a refined analysis of the spectral content which has led to the development a more efficient signal processing. This value represents a fivefold enhancement compared to previously reported read-out methods. Biosensing has been successfully achieved with gold-coated TFBGs used in reflection mode for the detection of insulin, with specific antibodies grafted on the gold surface. Our experimental study is an advance towards an industrialization of the FBG technology, as it opens the way to rapid parallel biodetection, benefiting from the multiple sensing channels (up to 64) of the interrogator as well as its high processing speed (repetition rate up to 3 kHz).","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":"115725391","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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