This paper proposes an approach for lateral force sensing based on fibre Bragg gratings (FBGs) and Gaussian process regression (GPR). The monitoring system is based on FBG sensors embedded in a glass structure (load cell), which converts the external lateral force into axial strain along the fibre. Whilst the use of conventional peak detection techniques to retrieve the Bragg wavelength of the embedded FBG sensor can easily fail due to the FBG spectral distortions induced by the lateral force, the proposed GPR approach permits a direct mapping of the FBG spectral shape (including its peak wavelength and any observed distortion) into the applied lateral force. Experimental results validate the proposed approach, demonstrating highly accurate lateral force monitoring even in conditions with distorted FBG reflection spectra.
{"title":"Lateral force sensing based on fibre Bragg gratings and Gaussian regression process","authors":"R. Fiorin, Sebastian San Martín, M. Soto","doi":"10.1117/12.2679926","DOIUrl":"https://doi.org/10.1117/12.2679926","url":null,"abstract":"This paper proposes an approach for lateral force sensing based on fibre Bragg gratings (FBGs) and Gaussian process regression (GPR). The monitoring system is based on FBG sensors embedded in a glass structure (load cell), which converts the external lateral force into axial strain along the fibre. Whilst the use of conventional peak detection techniques to retrieve the Bragg wavelength of the embedded FBG sensor can easily fail due to the FBG spectral distortions induced by the lateral force, the proposed GPR approach permits a direct mapping of the FBG spectral shape (including its peak wavelength and any observed distortion) into the applied lateral force. Experimental results validate the proposed approach, demonstrating highly accurate lateral force monitoring even in conditions with distorted FBG reflection spectra.","PeriodicalId":424244,"journal":{"name":"European Workshop on Optical Fibre Sensors","volume":"32 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":"122220167","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}
Jun He, Jia He, Xizhen Xu, Xiaoyu Yin, Yiping Wang
High-temperature sensing is in great demand in the aviation, nuclear power and petroleum industries. Single-crystal sapphire fiber is a promising candidate for the fabrication of ultra-high temperature sensor due to its high melting temperature of 2045 °C. However, sapphire fiber usually exhibits multimode operation owing to it having no cladding. We demonstrate a new method for fabricating single-mode helical Bragg grating waveguides (HBGWs) in a multimode sapphire fiber based on femtosecond laser direct writing technique. Such a helical Bragg waveguide can be obtained by using merely one fabrication step. The negative refractive index changes region works as a depressed cladding waveguide, and the periodical structure yields Bragg resonance. And hence, a single-mode HBGW created in sapphire fiber was successfully fabricated by using the proper parameters, such as a diameter of 10 μm and a single-pulse energy of 29.9 nJ, and the bandwidth of its reflection spectrum was merely 0.68 nm. Subsequently, the temperature response of the fabricated HBGW created in sapphire fiber was tested and it could withstand the high temperature of 1800 °C and its temperature sensitivity was 41.2 pm/°C.
{"title":"Single-mode helical sapphire fiber Bragg grating for high-temperature sensing","authors":"Jun He, Jia He, Xizhen Xu, Xiaoyu Yin, Yiping Wang","doi":"10.1117/12.2681899","DOIUrl":"https://doi.org/10.1117/12.2681899","url":null,"abstract":"High-temperature sensing is in great demand in the aviation, nuclear power and petroleum industries. Single-crystal sapphire fiber is a promising candidate for the fabrication of ultra-high temperature sensor due to its high melting temperature of 2045 °C. However, sapphire fiber usually exhibits multimode operation owing to it having no cladding. We demonstrate a new method for fabricating single-mode helical Bragg grating waveguides (HBGWs) in a multimode sapphire fiber based on femtosecond laser direct writing technique. Such a helical Bragg waveguide can be obtained by using merely one fabrication step. The negative refractive index changes region works as a depressed cladding waveguide, and the periodical structure yields Bragg resonance. And hence, a single-mode HBGW created in sapphire fiber was successfully fabricated by using the proper parameters, such as a diameter of 10 μm and a single-pulse energy of 29.9 nJ, and the bandwidth of its reflection spectrum was merely 0.68 nm. Subsequently, the temperature response of the fabricated HBGW created in sapphire fiber was tested and it could withstand the high temperature of 1800 °C and its temperature sensitivity was 41.2 pm/°C.","PeriodicalId":424244,"journal":{"name":"European Workshop on Optical Fibre Sensors","volume":"61 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":"124888244","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. Gierej, K. Rochlitz, A. Filipkowski, R. Buczyński, S. van Vlierberghe, P. Dubruel, H. Thienpont, F. Berghmans
Optical fiber-sensors based on biodegradable and biocompatible optical fibers can be considered for implantation and invivo biosensing applications. We report on the fabrication and characterization of microstructured biodegradable and biocompatible polymer optical fibers (mbioPOF) from poly(D,L-lactic acid) (PDLLA), which is a commercially available polyester regulated by the U.S. FDA. We manufactured the optical fiber preforms by means of a novel technique based on transfer molding and subsequently we fabricated microstructured optical fibers using a standard heat-draw tower. The attenuation coefficient of our mbioPOF is as low as 0.065 dB∕cm at 898 nm for a microstructured fiber with a diameter of 219±27 μm. Prolonged immersion of mbioPOFs in PBS at 37°C leads to an increase of the optical loss with only 0.4 dB/cm after 6h and with 0.8 dB/cm after 17h, as measured at a wavelength of 950 nm.
基于可生物降解和生物相容性光纤的光纤传感器可用于植入和体内生物传感应用。我们报道了由聚(D, l -乳酸)(PDLLA)制成的微结构可生物降解和生物相容性聚合物光纤(mbioPOF)的制备和表征，PDLLA是一种受美国FDA监管的商用聚酯。我们采用一种基于传递模塑的新技术制造光纤预制体，然后使用标准热拔塔制造微结构光纤。对于直径为219±27 μm的微结构光纤，mbioPOF在898 nm处的衰减系数低至0.065 dB / cm。在950nm波长下，mbioPOFs在37°C的PBS中长时间浸泡导致光学损耗增加，在6h后仅增加0.4 dB/cm，在17h后增加0.8 dB/cm。
{"title":"Biodegradable and biocompatible microstructured optical fiber made from Poly(D,L-Lactic Acid) (PDLLA)","authors":"A. Gierej, K. Rochlitz, A. Filipkowski, R. Buczyński, S. van Vlierberghe, P. Dubruel, H. Thienpont, F. Berghmans","doi":"10.1117/12.2678080","DOIUrl":"https://doi.org/10.1117/12.2678080","url":null,"abstract":"Optical fiber-sensors based on biodegradable and biocompatible optical fibers can be considered for implantation and invivo biosensing applications. We report on the fabrication and characterization of microstructured biodegradable and biocompatible polymer optical fibers (mbioPOF) from poly(D,L-lactic acid) (PDLLA), which is a commercially available polyester regulated by the U.S. FDA. We manufactured the optical fiber preforms by means of a novel technique based on transfer molding and subsequently we fabricated microstructured optical fibers using a standard heat-draw tower. The attenuation coefficient of our mbioPOF is as low as 0.065 dB∕cm at 898 nm for a microstructured fiber with a diameter of 219±27 μm. Prolonged immersion of mbioPOFs in PBS at 37°C leads to an increase of the optical loss with only 0.4 dB/cm after 6h and with 0.8 dB/cm after 17h, as measured at a wavelength of 950 nm.","PeriodicalId":424244,"journal":{"name":"European Workshop on Optical Fibre Sensors","volume":"91 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":"125110709","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}
F. Baldini, F. Chiavaioli, G. Bartolozzi, K. Schroeder, T. Habisreuther, M. Hahn, M. Satzke, S. Goerlich, J. Gäbler, A. Taddei, P. Cecchi, D. Bovio
Esophageal pressure, bile content and pH are important parameters in gastroesophageal diseases. An all-optical technology is described to perform simultaneously oesophageal manometry, pH-metry and bilimetry. The pressure measurement along the oesophagus is performed with 11 fibre optic gratings (FBGs) within a single mode fibre, which ensures monitoring every 2.5 cm along the oesophagus. The bile measurement is based on the direct absorption of bilirubin, the main biliary pigment, using a bundle of plastic optical fibres (POFs) carrying the signal. Regarding the detection of pH, an acid-base indicator that modifies its absorption as a function of pH is immobilized on glass particles with controlled porosity immobilized at the end of two POFs. The sensors are integrated in the same catheter for the simultaneous measurement of the three parameters. The prototype for the catheter interrogation was designed and developed, constituted by the integration of two optoelectronic modules for the interrogation of the pressure sensor and for the bile and pH sensors, respectively.
{"title":"Optical fibre catheter for gastroesophageal pressure, pH, and bile measurements","authors":"F. Baldini, F. Chiavaioli, G. Bartolozzi, K. Schroeder, T. Habisreuther, M. Hahn, M. Satzke, S. Goerlich, J. Gäbler, A. Taddei, P. Cecchi, D. Bovio","doi":"10.1117/12.2680507","DOIUrl":"https://doi.org/10.1117/12.2680507","url":null,"abstract":"Esophageal pressure, bile content and pH are important parameters in gastroesophageal diseases. An all-optical technology is described to perform simultaneously oesophageal manometry, pH-metry and bilimetry. The pressure measurement along the oesophagus is performed with 11 fibre optic gratings (FBGs) within a single mode fibre, which ensures monitoring every 2.5 cm along the oesophagus. The bile measurement is based on the direct absorption of bilirubin, the main biliary pigment, using a bundle of plastic optical fibres (POFs) carrying the signal. Regarding the detection of pH, an acid-base indicator that modifies its absorption as a function of pH is immobilized on glass particles with controlled porosity immobilized at the end of two POFs. The sensors are integrated in the same catheter for the simultaneous measurement of the three parameters. The prototype for the catheter interrogation was designed and developed, constituted by the integration of two optoelectronic modules for the interrogation of the pressure sensor and for the bile and pH sensors, respectively.","PeriodicalId":424244,"journal":{"name":"European Workshop on Optical Fibre Sensors","volume":"59 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":"127941245","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}
Yufei Zhang, Shaoxin Ma, Junfang Jiang, H. Qu, Xuehao Hu
We propose and experimentally demonstrate a fiber refractometer based on a C-shaped fiber and the Vernier effect. The sensor is fabricated by cascading a single mode fiber (SMF) pigtail together with a C-shaped fiber segment and another SMF segment. Thus, the C-shaped fiber would constitute an open cavity (sensing cavity) in which test analytes could be filled, while the SMF segment would constitute another reference cavity. Due to the similar optical path length of these two cavities, Vernier effect would be activated, thus forming spectral envelops in the reflection spectrum of the sensor. Variations in the refractive index (RI) of analytes would result in the shifts of the spectral envelops. Experiments are carried out in the characterization of the sensor measuring gaseous analytes. The sensitivity of the sensor is found to be ~37238 nm/RIU for gas RI measurement. The proposed sensor features the advantages such as ease of fabrication, extremely high sensitivity, capability of sensing of both gaseous and liquid analytes, small footprint, and good mechanical strength.
{"title":"Ultrasensitive fiber refractometer based on C-shaped fiber and Vernier effect","authors":"Yufei Zhang, Shaoxin Ma, Junfang Jiang, H. Qu, Xuehao Hu","doi":"10.1117/12.2678437","DOIUrl":"https://doi.org/10.1117/12.2678437","url":null,"abstract":"We propose and experimentally demonstrate a fiber refractometer based on a C-shaped fiber and the Vernier effect. The sensor is fabricated by cascading a single mode fiber (SMF) pigtail together with a C-shaped fiber segment and another SMF segment. Thus, the C-shaped fiber would constitute an open cavity (sensing cavity) in which test analytes could be filled, while the SMF segment would constitute another reference cavity. Due to the similar optical path length of these two cavities, Vernier effect would be activated, thus forming spectral envelops in the reflection spectrum of the sensor. Variations in the refractive index (RI) of analytes would result in the shifts of the spectral envelops. Experiments are carried out in the characterization of the sensor measuring gaseous analytes. The sensitivity of the sensor is found to be ~37238 nm/RIU for gas RI measurement. The proposed sensor features the advantages such as ease of fabrication, extremely high sensitivity, capability of sensing of both gaseous and liquid analytes, small footprint, and good mechanical strength.","PeriodicalId":424244,"journal":{"name":"European Workshop on Optical Fibre Sensors","volume":"42 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":"130482417","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 capabilities of optical fiber sensing based on forward Brillouin scattering (FBS) can be extended by exploiting the differential response to fiber perturbations of radial and torsional-radial acoustic modes. Radial and a subfamily of torsional-radial modes present a different sensitivity to changes of temperature and strain. By combining experimental measurements of the resonance frequencies of the different acoustic modes, we obtain (1) the Poison ratio of the optical fiber with an accuracy better than 1‰, and its temperature and strain responses, and (2), we demonstrate simultaneous and discriminative measurements of strain and temperature with accuracy better than 25 με and 0.2 °C, respectively.
{"title":"Expanding the sensing capabilities of forward Brillouin scattering in optical fibers by exploiting the differential response of radial and torsional-radial acoustic modes","authors":"L. Sánchez, A. Díez, J. Cruz, M. Andrés","doi":"10.1117/12.2680762","DOIUrl":"https://doi.org/10.1117/12.2680762","url":null,"abstract":"The capabilities of optical fiber sensing based on forward Brillouin scattering (FBS) can be extended by exploiting the differential response to fiber perturbations of radial and torsional-radial acoustic modes. Radial and a subfamily of torsional-radial modes present a different sensitivity to changes of temperature and strain. By combining experimental measurements of the resonance frequencies of the different acoustic modes, we obtain (1) the Poison ratio of the optical fiber with an accuracy better than 1‰, and its temperature and strain responses, and (2), we demonstrate simultaneous and discriminative measurements of strain and temperature with accuracy better than 25 με and 0.2 °C, respectively.","PeriodicalId":424244,"journal":{"name":"European Workshop on Optical Fibre Sensors","volume":"10 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":"126320669","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}
S. Memon, Ruoning Wang, B. Strunz, B. S. Chowdhry, J. Pembroke, E. Lewis
A unique side-polished balloon shaped heterocore structure plastic optical fibre (POF) sensor for real-time measurement of very low to high ethanol concentration in water is reported. The sensor is designed as a large core-small core-large core heterocore structure where small core fibre (SCF) acts as a sensing region, whereas large core fibre (LCFs) are used as input and output light waveguide s as well as to introduce the light leakage in the cladding of SCF at the heterocore structure’s input interface and hence generate the significant evanescent field. The principle of operation of the sensor is based on evanescent field interaction at the interface of modif ied SCF and the liquid boundary. The sensor is characterized for ethanol-water solutions in the ethanol concentration ranges of 20 %v/v to 80 %v/v, 1 %v/v to 10 %v/v, and 0.1 %v/v to 1 %v/v, demonstrating a maximum sensitivity of 54673 %/RIU. The experimentally evaluated high sensitivity of this sensor design for real-time measurement of ethanol concentration in water at different ranges makes it a potential candidate for implementation in the industry as a low-cost and real-time solution for ethanol sensing as well as other RI sensing applications.
{"title":"Novel side-polished balloon shaped heterocore structured plastic optical fibre ethanol sensor","authors":"S. Memon, Ruoning Wang, B. Strunz, B. S. Chowdhry, J. Pembroke, E. Lewis","doi":"10.1117/12.2679142","DOIUrl":"https://doi.org/10.1117/12.2679142","url":null,"abstract":"A unique side-polished balloon shaped heterocore structure plastic optical fibre (POF) sensor for real-time measurement of very low to high ethanol concentration in water is reported. The sensor is designed as a large core-small core-large core heterocore structure where small core fibre (SCF) acts as a sensing region, whereas large core fibre (LCFs) are used as input and output light waveguide s as well as to introduce the light leakage in the cladding of SCF at the heterocore structure’s input interface and hence generate the significant evanescent field. The principle of operation of the sensor is based on evanescent field interaction at the interface of modif ied SCF and the liquid boundary. The sensor is characterized for ethanol-water solutions in the ethanol concentration ranges of 20 %v/v to 80 %v/v, 1 %v/v to 10 %v/v, and 0.1 %v/v to 1 %v/v, demonstrating a maximum sensitivity of 54673 %/RIU. The experimentally evaluated high sensitivity of this sensor design for real-time measurement of ethanol concentration in water at different ranges makes it a potential candidate for implementation in the industry as a low-cost and real-time solution for ethanol sensing as well as other RI sensing applications.","PeriodicalId":424244,"journal":{"name":"European Workshop on Optical Fibre Sensors","volume":"12 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":"115586714","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}
S. Ucci, S. Spaziani, G. Quero, P. Vaiano, M. Principe, A. Micco, A. Sandomenico, M. Ruvo, M. Consales, A. Cusano
The demand for highly sensitive, fast and low-cost biosensors for reliable quantification of small biomolecules or cancer biomarkers is leading to the development of a new class of devices able to change the techniques currently used for diagnosis in oncology. Lab‐on‐fiber (LoF) optrodes offer several advantages over conventional techniques for point‐of‐care platforms aimed at real‐time and label‐free detection of clinically relevant biomarkers. Moreover, the easy integration of LoF platforms in medical needles, catheters and nano-endoscopes offers unique potentials for in vivo biopsies and tumor microenvironment assessment. Here, we demonstrate the capability to improve the immobilization strategies through the use of hinge carbohydrates by involving homemade antibodies that demonstrated a significantly improved recognition of the antigen with ultra‐low detection limits. In order to create an effective pipeline for the improvement of biofunctionalization protocols to be used in connection with the LoF platform, here we first, optimized the protocol using a microfluidic Surface Plasmon Resonance device. Then we transferred the optimized strategy on LoF platform, based on Optical Fiber Meta‐tip (OFMT), for the final validation. As a clinically relevant scenario, we focused on a serological biomarker, Cripto‐1, for its ability to promote tumorigenesis in breast and liver cancer. Reported results demonstrate that the proposed approach based on oriented antibody immobilization is able to significantly improve Cripto‐1 detection with a ten‐fold enhancement versus the random approach. Therefore, our work opens new avenues in the development of high‐sensitivity LoF biosensors for the detection of clinically relevant biomarkers in the sub‐ng/mL range.
{"title":"High sensitivity lab-on-fiber biosensing platform assisted by oriented antibody immobilization strategy","authors":"S. Ucci, S. Spaziani, G. Quero, P. Vaiano, M. Principe, A. Micco, A. Sandomenico, M. Ruvo, M. Consales, A. Cusano","doi":"10.1117/12.2678124","DOIUrl":"https://doi.org/10.1117/12.2678124","url":null,"abstract":"The demand for highly sensitive, fast and low-cost biosensors for reliable quantification of small biomolecules or cancer biomarkers is leading to the development of a new class of devices able to change the techniques currently used for diagnosis in oncology. Lab‐on‐fiber (LoF) optrodes offer several advantages over conventional techniques for point‐of‐care platforms aimed at real‐time and label‐free detection of clinically relevant biomarkers. Moreover, the easy integration of LoF platforms in medical needles, catheters and nano-endoscopes offers unique potentials for in vivo biopsies and tumor microenvironment assessment. Here, we demonstrate the capability to improve the immobilization strategies through the use of hinge carbohydrates by involving homemade antibodies that demonstrated a significantly improved recognition of the antigen with ultra‐low detection limits. In order to create an effective pipeline for the improvement of biofunctionalization protocols to be used in connection with the LoF platform, here we first, optimized the protocol using a microfluidic Surface Plasmon Resonance device. Then we transferred the optimized strategy on LoF platform, based on Optical Fiber Meta‐tip (OFMT), for the final validation. As a clinically relevant scenario, we focused on a serological biomarker, Cripto‐1, for its ability to promote tumorigenesis in breast and liver cancer. Reported results demonstrate that the proposed approach based on oriented antibody immobilization is able to significantly improve Cripto‐1 detection with a ten‐fold enhancement versus the random approach. Therefore, our work opens new avenues in the development of high‐sensitivity LoF biosensors for the detection of clinically relevant biomarkers in the sub‐ng/mL range.","PeriodicalId":424244,"journal":{"name":"European Workshop on Optical Fibre Sensors","volume":"9 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":"131106872","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. Minardo, E. Catalano, R. Vallifuoco, L. Zeni, R. Bernini, M. Caponero, A. Castaldo, G. de Marzi, A. Masi, C. Mazzotta, A. Polimadei
We present the results of an experimental campaign aimed at demonstrating the use of a distributed optical fiber sensor based on Brillouin scattering in static and dynamic temperature measurements at cryogenic temperatures (≈ 84 K). The experimental results, obtained through Brillouin Optical Frequency-Domain Analysis (BOFDA) at a spatial resolution of 16 mm, are compared with temperature measurements using thermocouples and fiber Bragg gratings. The distributed sensor is able to capture local temperature variations of ≈ 2 °C at an acquisition rate of 1 Hz.
{"title":"Distributed cryogenic temperature sensing through Brillouin optical frequency-domain analysis","authors":"A. Minardo, E. Catalano, R. Vallifuoco, L. Zeni, R. Bernini, M. Caponero, A. Castaldo, G. de Marzi, A. Masi, C. Mazzotta, A. Polimadei","doi":"10.1117/12.2678097","DOIUrl":"https://doi.org/10.1117/12.2678097","url":null,"abstract":"We present the results of an experimental campaign aimed at demonstrating the use of a distributed optical fiber sensor based on Brillouin scattering in static and dynamic temperature measurements at cryogenic temperatures (≈ 84 K). The experimental results, obtained through Brillouin Optical Frequency-Domain Analysis (BOFDA) at a spatial resolution of 16 mm, are compared with temperature measurements using thermocouples and fiber Bragg gratings. The distributed sensor is able to capture local temperature variations of ≈ 2 °C at an acquisition rate of 1 Hz.","PeriodicalId":424244,"journal":{"name":"European Workshop on Optical Fibre Sensors","volume":"12643 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":"128745915","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}
Johanna Unterkofler, R. Klambauer, Alexander Bergmann
Monitoring the temperature of lithium-ion batteries (LiB) is crucial for safe operation. The degradation of a LiB is highly dependent on temperature. It is desirable to keep the LiB within a temperature window between 15 °C and 35 °C. Otherwise, enhanced degradation will take place. So far, only the surface temperature of a LiB at a single point is measured, but the internal temperature can be significantly higher during operation. In this work, we integrated fiber Bragg grating (FBG) temperature sensors into lithium-ion pouch cells and evaluated the stability of the sensitivity of the FBG sensors over four months. Two prototype pouch cells were manufactured each with two fibers. Each fiber has three FBGs inscribed, hence there are six temperature measurement points per pouch cell. The FBG temperature sensors comprise a polyimide-coated fiber with the three inscribed FBGs and a polyimide-coated fused silica capillary. The capillary mitigates the influence of external strain on the FBGs because the fiber can move freely in the capillary due to the single mounting point on one side of the capillary. The sensitivity was measured once a month for a period of four months. Although, the Bragg wavelength changed over time, and baseline correction is required for reliable temperature calculation. The measurements show comparable stability of sensitivity over time with another publication.
{"title":"Long-term stability study of fiber Bragg grating sensors integrated into a lithium-ion pouch cell","authors":"Johanna Unterkofler, R. Klambauer, Alexander Bergmann","doi":"10.1117/12.2678298","DOIUrl":"https://doi.org/10.1117/12.2678298","url":null,"abstract":"Monitoring the temperature of lithium-ion batteries (LiB) is crucial for safe operation. The degradation of a LiB is highly dependent on temperature. It is desirable to keep the LiB within a temperature window between 15 °C and 35 °C. Otherwise, enhanced degradation will take place. So far, only the surface temperature of a LiB at a single point is measured, but the internal temperature can be significantly higher during operation. In this work, we integrated fiber Bragg grating (FBG) temperature sensors into lithium-ion pouch cells and evaluated the stability of the sensitivity of the FBG sensors over four months. Two prototype pouch cells were manufactured each with two fibers. Each fiber has three FBGs inscribed, hence there are six temperature measurement points per pouch cell. The FBG temperature sensors comprise a polyimide-coated fiber with the three inscribed FBGs and a polyimide-coated fused silica capillary. The capillary mitigates the influence of external strain on the FBGs because the fiber can move freely in the capillary due to the single mounting point on one side of the capillary. The sensitivity was measured once a month for a period of four months. Although, the Bragg wavelength changed over time, and baseline correction is required for reliable temperature calculation. The measurements show comparable stability of sensitivity over time with another publication.","PeriodicalId":424244,"journal":{"name":"European Workshop on Optical Fibre Sensors","volume":"11 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":"125307825","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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