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Demodulation of multilongitudinal mode fiber-laser sensor based on undersampling technique
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Paper Abstract

An innovative demodulation system for multilongitudinal mode fiber laser sensor has been proposed. By using a bandpass filter and a low-speed analog-to-digital converter (ADC), the high-frequency sensing signal can be downconverted and sampled simultaneously when the unaliasing condition is satisfied. Since the MLM fiber laser sensor could generate a wideband electrical signal after optical-to-electrical conversion, it is convenient to filter the signal to meet the unaliasing condition by a tunable bandpass filter while keeping the sample rate unchanged. Moreover, each tone of the beating frequency signal has the full information for demodulation of measurand. The demodulation system only needs a bandpass filter and a low-speed ADC which reduces the cost of the system and make the system more stable. A proof-of-concept experiment is conducted to verify the proposed scheme. Eventually by demodulating a beat frequency in 1.625GHz, a sensitivity of -5.87kHz/°C is achieved in a fiber laser sensing system with a sample rate of 500MHz.

Paper Details

Date Published: 23 October 2018
PDF: 7 pages
Proc. SPIE 10821, Advanced Sensor Systems and Applications VIII, 108210X (23 October 2018); doi: 10.1117/12.2504240
Show Author Affiliations
Shangjing Liu, Nanjing Univ. (China)
Long Huang, Nanjing Univ. (China)
Pan Dai, Nanjing Univ. (China)
Runze Liu, Nanjing Univ. (China)
Xiangfei Chen, Nanjing Univ. (China)

Published in SPIE Proceedings Vol. 10821:
Advanced Sensor Systems and Applications VIII
Tiegen Liu; Shibin Jiang, Editor(s)

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