Demodulation of fiber Bragg grating sensors based on dynamic tuning of a multimode laser diode

被引：25

作者：

Ferreira, LA ^{[1
]}

Diatzikis, EV

Santos, JL

Farahi, F

机构：

[1] Inst Engn Sistemas & Computat, Unidade Tecnol Optoelect & Elect, Oporto, Portugal

[2] Univ Porto, Fac Ciencias, Dept Fis, P-4169007 Oporto, Portugal

[3] Univ N Carolina, Dept Phys, Charlotte, NC 28223 USA

来源：

APPLIED OPTICS | 1999年 / 38卷 / 22期

关键词：

D O I：

10.1364/AO.38.004751

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Dither demodulation of fiber Bragg grating sensors illuminated with multimode light from laser diodes is theoretically and experimentally investigated. Quasi-static temperature and strain sensitivities of 0.09 degrees C/root Hz and 0.6 mu epsilon/root Hz are obtained. We show that it is possible to measure small ac signals that lie outside the feedback loop bandwidth by using a synchronous detection referenced to twice the dither frequency. In this situation, dynamic strain sensitivity of 3.3 n epsilon/root Hz is achieved. (C) 1999 Optical Society of America.

引用

页码：4751 / 4759

页数：9

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