Automatic distributed fiber optic pressure-measuring system

Yingjun Pan; Zhigao Li; Jian Zhou; Shanglian Huang

doi:10.1117/12.144159

11 May 1993 Automatic distributed fiber optic pressure-measuring system

Yingjun Pan, Zhigao Li, Jian Zhou, Shanglian Huang

Proceedings Volume 1979, 1992 International Conference on Lasers and Optoelectronics; (1993) https://doi.org/10.1117/12.144159
Event: 1992 International Conference on Lasers and Optoelectronics, 1992, Bejing, China

Abstract

A method for measuring a distributed external pressure field along an optic fiber is discussed, which is based on the principle of mode-coupling of polarization-maintaining fiber and optical path compensation in the interference of two beams from a broadband light source. A modified Mach-Zehnder interferometer is used to process the optical signal representing the distributed pressure information, and a polarization light heterodyne detecting technique is used to improve the signal-to-noise ratio and to eliminate the influences of light source fluctuation and background light. For the automatic measurement of the distributed pressure information, an A/D and interface circuit is designed. Under the control of the microcomputer, the arm of the interferometer with an optical path scanning setup scans a distance corresponding to the length of the fiber, then the information of the pressure field is obtained. The experimental results have shown that the measuring system has a high measurement accuracy and a rather large pressure measuring range (10 g/mm - 500 g/mm).

Citation Download Citation

Yingjun Pan, Zhigao Li, Jian Zhou, and Shanglian Huang "Automatic distributed fiber optic pressure-measuring system", Proc. SPIE 1979, 1992 International Conference on Lasers and Optoelectronics, (11 May 1993); https://doi.org/10.1117/12.144159

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