Distributed measurement of static strain in an optical fiber with multiple Bragg gratings at nominally equal wavelengths

被引：77

作者：

Froggatt, M ^{[1
]}

Moore, J ^{[1
]}

机构：

[1] NASA, Langley Res Ctr, Hampton, VA 23681 USA

来源：

APPLIED OPTICS | 1998年 / 37卷 / 10期

关键词：

D O I：

10.1364/AO.37.001741

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

The Fourier transform relationship between the reflected light from a Bragg grating and the complex spatial modulation of the Bragg grating is used to produce a distributed strain sensing system. A tunable external cavity diode laser along with a reference reflector in an optical fiber are used to produce a measurement of the phase and amplitude of the reflected light from the modulated Bragg grating as a function of wavelength. The system is demonstrated with 22 Bragg gratings in a single fiber on a cantilever beam and compared with foil strain gauge readings.

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页码：1741 / 1746

页数：6

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