R. Desmarchelier, R. Cotillard, N. Roussel, S. Armiroli, G. Laffont
This paper presents the development of a CO2 laser-based heating system to simulate fast thermal phenomena on high temperature resistant FBGs dedicated to high temperature profiles monitoring within components exposed to hot plasma inside Tokamak. We have demonstrated the reliability of two optical fiber based sensing techniques to control spatial and temporal annealing measurement during high and fast thermal process.
{"title":"Monitoring of single-mode fiber laser heating using Rayleigh scattering and 1st order fs-PbP fiber Bragg Grating","authors":"R. Desmarchelier, R. Cotillard, N. Roussel, S. Armiroli, G. Laffont","doi":"10.1117/12.2265795","DOIUrl":"https://doi.org/10.1117/12.2265795","url":null,"abstract":"This paper presents the development of a CO2 laser-based heating system to simulate fast thermal phenomena on high temperature resistant FBGs dedicated to high temperature profiles monitoring within components exposed to hot plasma inside Tokamak. We have demonstrated the reliability of two optical fiber based sensing techniques to control spatial and temporal annealing measurement during high and fast thermal process.","PeriodicalId":198716,"journal":{"name":"2017 25th Optical Fiber Sensors Conference (OFS)","volume":"96 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122510842","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}
In this paper, the fabrication of a novel refractive index sensor based on helical long period grating (HLPG) written in a dual-hole elliptical core fiber (DHECF) was demonstrated and the sensing characteristic was experimentally investigated. Due to the structure of the DHECF, The proposed HLPG sensor could work with ultra-small dose testing samples. In addition, since the sample is isolated from the external environment, the testing is immunity to the external interference. The experimental results showed that the testing sensitivity of the sensor was 194nm/RIU with the refractive index range of 1.333 to 1.385. The proposed structure will have a good practicability in the microfluidic sensing system.
{"title":"Refractive index sensor based on helical long period grating based on dual-hole elliptical core fiber","authors":"Chao Liu, Yu Zhang, Zhihai Liu, Yaxun Zhang","doi":"10.1117/12.2267548","DOIUrl":"https://doi.org/10.1117/12.2267548","url":null,"abstract":"In this paper, the fabrication of a novel refractive index sensor based on helical long period grating (HLPG) written in a dual-hole elliptical core fiber (DHECF) was demonstrated and the sensing characteristic was experimentally investigated. Due to the structure of the DHECF, The proposed HLPG sensor could work with ultra-small dose testing samples. In addition, since the sample is isolated from the external environment, the testing is immunity to the external interference. The experimental results showed that the testing sensitivity of the sensor was 194nm/RIU with the refractive index range of 1.333 to 1.385. The proposed structure will have a good practicability in the microfluidic sensing system.","PeriodicalId":198716,"journal":{"name":"2017 25th Optical Fiber Sensors Conference (OFS)","volume":"806 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117289082","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}
Temperature and strain discrimination is experimentally demonstrated in an elliptical-core polarization-maintaining fiber by making use of Rayleigh-based distributed birefringence measurements and the frequency shift of the correlation peak obtained by standard coherent optical time-domain reflectometry. The high sensitivity of coherent Rayleigh sensing and the very distinct behavior of birefringence makes the two quantities clearly discriminated, resulting in temperature and strain accuracies of ∼ 40 mK and ∼ 0.5 με, respectively, for distributed measurements with a 2 m spatial resolution.
{"title":"Discrimination of temperature and strain by combined refractive index and birefringence measurements using coherent Rayleigh sensing","authors":"Xin Lu, M. Soto, L. Thévenaz","doi":"10.1117/12.2264636","DOIUrl":"https://doi.org/10.1117/12.2264636","url":null,"abstract":"Temperature and strain discrimination is experimentally demonstrated in an elliptical-core polarization-maintaining fiber by making use of Rayleigh-based distributed birefringence measurements and the frequency shift of the correlation peak obtained by standard coherent optical time-domain reflectometry. The high sensitivity of coherent Rayleigh sensing and the very distinct behavior of birefringence makes the two quantities clearly discriminated, resulting in temperature and strain accuracies of ∼ 40 mK and ∼ 0.5 με, respectively, for distributed measurements with a 2 m spatial resolution.","PeriodicalId":198716,"journal":{"name":"2017 25th Optical Fiber Sensors Conference (OFS)","volume":"109 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117187322","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}
An interrogation technique of cascaded FBGs sensors based on a Microwave Photonics filtering technique under coherent regime is presented. The sensing information of a 5m fiber coil with 500 weak FBGs with a similar central wavelength is retrieved. The principle of operation is based on the calculation of the impulsive response by recording the electrical frequency response of the system. Hot spot detection and temperature measurement are demonstrated through experimental measurements with a temperature sensitivity of 0.6dB/°C. The resolution in the measurement is related to the bandwidth of the electrical measurement and we have obtained a resolution of 20 cm for an electrical bandwidth of 1 GHz and a SNR bigger than 16dB.
{"title":"Microwave photonics filtering interrogation technique under coherent regime for hot spot detection on cascaded FBG fiber","authors":"J. Hervás, D. Barrera, J. Madrigal, S. Sales","doi":"10.1117/12.2265395","DOIUrl":"https://doi.org/10.1117/12.2265395","url":null,"abstract":"An interrogation technique of cascaded FBGs sensors based on a Microwave Photonics filtering technique under coherent regime is presented. The sensing information of a 5m fiber coil with 500 weak FBGs with a similar central wavelength is retrieved. The principle of operation is based on the calculation of the impulsive response by recording the electrical frequency response of the system. Hot spot detection and temperature measurement are demonstrated through experimental measurements with a temperature sensitivity of 0.6dB/°C. The resolution in the measurement is related to the bandwidth of the electrical measurement and we have obtained a resolution of 20 cm for an electrical bandwidth of 1 GHz and a SNR bigger than 16dB.","PeriodicalId":198716,"journal":{"name":"2017 25th Optical Fiber Sensors Conference (OFS)","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116622574","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 Fiber Bragg Grating(FBG) sensors are applied to Giant Magnetostrictive Actuator(GMA) to obtain the multi-physics field factors, which are the basis of data driven model. The real working circumstance of GMA is complex and nonlinear, and the traditional theoretical physics model of GMA cannot satisfy it. Hence, the multi-physics field factors of the components of GMA in real working process are gathered real-time by FBG sensors, such as temperature of Giant Magnetostrictive Material(GMM) stick and coil, displacement and vibration of GMM stick, current of coil etc, which are utilized to represent the strong nonlinear characteristics of GMA. Furthermore, the data driven model of GMA is built with the Least Squares Support Vector Machine(LS-SVM) method based on multi-physics field factors. The performance of the novel GMA model is evaluated by experiment, its maximum error is 1.1% with frequency range from 0 to 1000Hz and temperature range from 20°C to 100°C.
{"title":"Research on multi-physics field factors and data driven model of giant magnetostrictive actuator based on FBG sensors","authors":"P. Han, Guanlin Du","doi":"10.1117/12.2261606","DOIUrl":"https://doi.org/10.1117/12.2261606","url":null,"abstract":"The Fiber Bragg Grating(FBG) sensors are applied to Giant Magnetostrictive Actuator(GMA) to obtain the multi-physics field factors, which are the basis of data driven model. The real working circumstance of GMA is complex and nonlinear, and the traditional theoretical physics model of GMA cannot satisfy it. Hence, the multi-physics field factors of the components of GMA in real working process are gathered real-time by FBG sensors, such as temperature of Giant Magnetostrictive Material(GMM) stick and coil, displacement and vibration of GMM stick, current of coil etc, which are utilized to represent the strong nonlinear characteristics of GMA. Furthermore, the data driven model of GMA is built with the Least Squares Support Vector Machine(LS-SVM) method based on multi-physics field factors. The performance of the novel GMA model is evaluated by experiment, its maximum error is 1.1% with frequency range from 0 to 1000Hz and temperature range from 20°C to 100°C.","PeriodicalId":198716,"journal":{"name":"2017 25th Optical Fiber Sensors Conference (OFS)","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114776356","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}
We demonstrate three microfluidic chip based microfiber/nanofiber sensors for ultra-sensitive absorption, fluorescence, and femtoliter-scale sensing, respectively. The sensors shown here may open up new opportunities for ultra-sensitive biosensing and single molecule analysis.
{"title":"Microfluidic chip based microfiber/nanofiber sensors","authors":"Lei Zhang, L. Tong","doi":"10.1117/12.2264873","DOIUrl":"https://doi.org/10.1117/12.2264873","url":null,"abstract":"We demonstrate three microfluidic chip based microfiber/nanofiber sensors for ultra-sensitive absorption, fluorescence, and femtoliter-scale sensing, respectively. The sensors shown here may open up new opportunities for ultra-sensitive biosensing and single molecule analysis.","PeriodicalId":198716,"journal":{"name":"2017 25th Optical Fiber Sensors Conference (OFS)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115349585","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}
We propose and demonstrate a miniature Fabry-Perot (F-P) interferometric sensor based on a hollow glass microsphere (HGM) for highly sensitive temperature measurement. The sensor head is fabricated by sticking a HGM on the end face of a single-mode fiber, and it consists of a short air F-P cavity between the front and the rear surfaces of the HGM. A sensor with 135.7280-μm cavity length was tested for temperature measurement from −5 °C to 50 °C. The obtained sensitivity reached up to 24.5 pm/°C and the variation rate of the HGM-F-P's cavity length was2.1 nm/°C. The advantages of compact size, easy fabrication and low cost make the sensor suitable for highly sensitive temperature sensing.
{"title":"Hollow-glass-microsphere-structured Fabry-Perot interferometric sensor for highly sensitive temperature measurement","authors":"Junna Cheng, Ciming Zhou, D. Fan, Y. Ou","doi":"10.1117/12.2267518","DOIUrl":"https://doi.org/10.1117/12.2267518","url":null,"abstract":"We propose and demonstrate a miniature Fabry-Perot (F-P) interferometric sensor based on a hollow glass microsphere (HGM) for highly sensitive temperature measurement. The sensor head is fabricated by sticking a HGM on the end face of a single-mode fiber, and it consists of a short air F-P cavity between the front and the rear surfaces of the HGM. A sensor with 135.7280-μm cavity length was tested for temperature measurement from −5 °C to 50 °C. The obtained sensitivity reached up to 24.5 pm/°C and the variation rate of the HGM-F-P's cavity length was2.1 nm/°C. The advantages of compact size, easy fabrication and low cost make the sensor suitable for highly sensitive temperature sensing.","PeriodicalId":198716,"journal":{"name":"2017 25th Optical Fiber Sensors Conference (OFS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123715372","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}
P. Marć, N. Przybysz, K. Stasiewicz, L. Jaroszewicz
In the paper we have presented a multilevel temperature threshold sensor. The sensor's transducers were made by filling a commercially available Photonic Crystal Fiber — LMA-10. As a filling material we used a selected group of n-alkanes with different melting points. We have prepared a set of transducers and they were tested in an intensity based sensor configuration. The experimental results of the four transducers' sensors showed that it is possible to distinguish five threshold levels from the sensor output signal which were correlated with measured temperatures of ON and OFF states for particular transducers.
{"title":"Multilevel temperature threshold sensor based on Photonic Crystal Fiber transducers","authors":"P. Marć, N. Przybysz, K. Stasiewicz, L. Jaroszewicz","doi":"10.1117/12.2262101","DOIUrl":"https://doi.org/10.1117/12.2262101","url":null,"abstract":"In the paper we have presented a multilevel temperature threshold sensor. The sensor's transducers were made by filling a commercially available Photonic Crystal Fiber — LMA-10. As a filling material we used a selected group of n-alkanes with different melting points. We have prepared a set of transducers and they were tested in an intensity based sensor configuration. The experimental results of the four transducers' sensors showed that it is possible to distinguish five threshold levels from the sensor output signal which were correlated with measured temperatures of ON and OFF states for particular transducers.","PeriodicalId":198716,"journal":{"name":"2017 25th Optical Fiber Sensors Conference (OFS)","volume":"106 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123528410","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. Martins, K. Shi, B. Thomsen, S. Martín-López, M. González-Herráez, S. Savory
Recently, it has been demonstrated that by recovering the amplitude and phase of the backscattered optical signal, a ΦOTDR using pulse coding can be treated as a fully linear system in terms of trace coding/decoding, thus allowing for the use of tens of thousands of bits with a dramatic improvement of the system performance. In this communication, as a continuation of previous work by the same authors, a preliminary study aiming at characterizing the limits of the system in terms of maximum usable code length is presented. Using a code exceeding 1 million bits over a duration of 0.26ms, it is observed that fiber optical path variations exceeding ≈π occurring over a time inferior to the pulse code length can lead to localized fading in the ΦOTDR trace. The occurrence, positions and form of the fading points along the ΦOTDR trace is observed to be strongly dependent on the type, frequency and amplitude of the perturbations applied to the fiber.
{"title":"Code length limit in phase-sensitive OTDR using ultralong (>1M bits) pulse sequences due to fading induced by fiber optical path drifts","authors":"H. Martins, K. Shi, B. Thomsen, S. Martín-López, M. González-Herráez, S. Savory","doi":"10.1117/12.2263117","DOIUrl":"https://doi.org/10.1117/12.2263117","url":null,"abstract":"Recently, it has been demonstrated that by recovering the amplitude and phase of the backscattered optical signal, a ΦOTDR using pulse coding can be treated as a fully linear system in terms of trace coding/decoding, thus allowing for the use of tens of thousands of bits with a dramatic improvement of the system performance. In this communication, as a continuation of previous work by the same authors, a preliminary study aiming at characterizing the limits of the system in terms of maximum usable code length is presented. Using a code exceeding 1 million bits over a duration of 0.26ms, it is observed that fiber optical path variations exceeding ≈π occurring over a time inferior to the pulse code length can lead to localized fading in the ΦOTDR trace. The occurrence, positions and form of the fading points along the ΦOTDR trace is observed to be strongly dependent on the type, frequency and amplitude of the perturbations applied to the fiber.","PeriodicalId":198716,"journal":{"name":"2017 25th Optical Fiber Sensors Conference (OFS)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123549779","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. F. Shirazi, R. E. Wijesinghe, N. Ravichandran, Pilun Kim, Mansik Jeon, Jeehyun Kim
The conventional Fourier domain optical coherence tomography system requires single scanner for two dimensional cross-sectional image and two scanners for volumetric image. Parallel spectral domain optical coherence tomography has advantage of single scanner for volumetric image, while two dimensional cross-sectional images are obtained by parallel acquisition of illuminated line on sample using area camera. In this study, the industrial inspection of optical thin film on touch screen panels was demonstrated using parallel spectral domain optical coherence tomography. The cross-sectional and volumetric images were acquired to detect the internal sub layer defects in optical thin film which are difficult to observe using visual or machine vision based inspection methods. The results indicate the possible application of the proposed system in touch screen panels inspection for quality assurance of product at consumer end.
{"title":"Optical thin film inspection using parallel spectral domain optical coherence tomography","authors":"M. F. Shirazi, R. E. Wijesinghe, N. Ravichandran, Pilun Kim, Mansik Jeon, Jeehyun Kim","doi":"10.1117/12.2267395","DOIUrl":"https://doi.org/10.1117/12.2267395","url":null,"abstract":"The conventional Fourier domain optical coherence tomography system requires single scanner for two dimensional cross-sectional image and two scanners for volumetric image. Parallel spectral domain optical coherence tomography has advantage of single scanner for volumetric image, while two dimensional cross-sectional images are obtained by parallel acquisition of illuminated line on sample using area camera. In this study, the industrial inspection of optical thin film on touch screen panels was demonstrated using parallel spectral domain optical coherence tomography. The cross-sectional and volumetric images were acquired to detect the internal sub layer defects in optical thin film which are difficult to observe using visual or machine vision based inspection methods. The results indicate the possible application of the proposed system in touch screen panels inspection for quality assurance of product at consumer end.","PeriodicalId":198716,"journal":{"name":"2017 25th Optical Fiber Sensors Conference (OFS)","volume":"118 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124529341","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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