Fiber-optic extrinsic Fabry-Perot interferometer sensors with three-wavelength digital phase demodulation

被引：70

作者：

Schmidt, M ^{[1
]}

Fürstenau, N ^{[1
]}

机构：

[1] German Aerosp Ctr, Deutsch Zentrum Luft & Raumfahrt, Inst Flight Guidance, D-38022 Braunschweig, Germany

来源：

OPTICS LETTERS | 1999年 / 24卷 / 09期

关键词：

D O I：

10.1364/OL.24.000599

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

A three-wavelength-based passive quadrature digital phase-demodulation scheme has been developed for readout of fiber-optic extrinsic Fabry-Perot interferometer vibration, acoustic, and strain sensors. This scheme uses a superluminescent diode light source with interference filters in front of the photodiodes and realtime arctan calculation. Quasi-static strain and dynamic vibration sensing with up to an 80-kHz sampling rate is demonstrated. Periodic nonlinearities owing to dephasing with increasing fringe number are corrected for with a suitable algorithm, resulting in significant improvement of the Linearity of the sensor characteristics. (C) 1999 Optical Society of America.

引用

页码：599 / 601

页数：3

共 8 条

[1] Multiple strain state measurements using conventional and absolute optical fiber-based extrinsic Fabry-Perot interferometric strain sensors [J].