Development of A Stable Optical Fiber Refractometer Using PMDI in Two Parallel Fabry-Perots
碩士 === 國立成功大學 === 機械工程學系 === 87 === Developing an optical fiber refractometer to measure the refractive index change in the resolution of 0.9×10-5 or higher at the frequency response from DC to 100 Hz is presented. It is known that optical fiber sensors in a phase modulation are very sensitive to th...
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ndltd-TW-087NCKU04890012016-07-11T04:13:32Z http://ndltd.ncl.edu.tw/handle/65987440183761402495 Development of A Stable Optical Fiber Refractometer Using PMDI in Two Parallel Fabry-Perots 低串擾光纖感測原理、實作與其在濃度量測上的應用 Wen-Jenq Wang 王文正 碩士 國立成功大學 機械工程學系 87 Developing an optical fiber refractometer to measure the refractive index change in the resolution of 0.9×10-5 or higher at the frequency response from DC to 100 Hz is presented. It is known that optical fiber sensors in a phase modulation are very sensitive to the disturbance, especially in thermal drifts or vibrations. Thereby, an optical fiber sensing system for a long-term monitoring is quite difficult in a phase modulation. This stabilization proposed in this paper is done by a cancellation technique. Two-parallel Fabry-Perot cavities as sensors corresponding to two path-matching cavities as read-out systems are to form path-matching differential interferometries (PMDI). One Fabry-Perot cavity is used for a sensing head, and the other for a reference signal. To compensate the variation effects on a PZT stack driven by a function generator in a single-channel phase tracker, a cancellation technique is utilized to stable the sensing system by subtraction. As a result, the experimental data show that the stabilization in a sensing system can be kept in 1×10-4 refractive index change without any serious variations in a four-hour monitoring. Accordingly, this system can be implemented potentially in the medical detection system for a long-term monitoring. Yu-Lung Lo Hsin-Yi Lay 羅裕龍 賴新一 1999 學位論文 ; thesis 92 zh-TW |
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碩士 === 國立成功大學 === 機械工程學系 === 87 === Developing an optical fiber refractometer to measure the refractive index change in the resolution of 0.9×10-5 or higher at the frequency response from DC to 100 Hz is presented. It is known that optical fiber sensors in a phase modulation are very sensitive to the disturbance, especially in thermal drifts or vibrations. Thereby, an optical fiber sensing system for a long-term monitoring is quite difficult in a phase modulation. This stabilization proposed in this paper is done by a cancellation technique. Two-parallel Fabry-Perot cavities as sensors corresponding to two path-matching cavities as read-out systems are to form path-matching differential interferometries (PMDI). One Fabry-Perot cavity is used for a sensing head, and the other for a reference signal. To compensate the variation effects on a PZT stack driven by a function generator in a single-channel phase tracker, a cancellation technique is utilized to stable the sensing system by subtraction. As a result, the experimental data show that the stabilization in a sensing system can be kept in 1×10-4 refractive index change without any serious variations in a four-hour monitoring. Accordingly, this system can be implemented potentially in the medical detection system for a long-term monitoring.
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author2 |
Yu-Lung Lo |
author_facet |
Yu-Lung Lo Wen-Jenq Wang 王文正 |
author |
Wen-Jenq Wang 王文正 |
spellingShingle |
Wen-Jenq Wang 王文正 Development of A Stable Optical Fiber Refractometer Using PMDI in Two Parallel Fabry-Perots |
author_sort |
Wen-Jenq Wang |
title |
Development of A Stable Optical Fiber Refractometer Using PMDI in Two Parallel Fabry-Perots |
title_short |
Development of A Stable Optical Fiber Refractometer Using PMDI in Two Parallel Fabry-Perots |
title_full |
Development of A Stable Optical Fiber Refractometer Using PMDI in Two Parallel Fabry-Perots |
title_fullStr |
Development of A Stable Optical Fiber Refractometer Using PMDI in Two Parallel Fabry-Perots |
title_full_unstemmed |
Development of A Stable Optical Fiber Refractometer Using PMDI in Two Parallel Fabry-Perots |
title_sort |
development of a stable optical fiber refractometer using pmdi in two parallel fabry-perots |
publishDate |
1999 |
url |
http://ndltd.ncl.edu.tw/handle/65987440183761402495 |
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