Research of eliminating temperature interference in stress measurement by fiber Bragg grating

Yutian Wang; Lifang Cao; Qinghua Wang; Xuecai Liu

doi:10.1117/12.715264

13 October 2006 Research of eliminating temperature interference in stress measurement by fiber Bragg grating

Yutian Wang, Lifang Cao, Qinghua Wang, Xuecai Liu

Proceedings Volume 6280, Third International Symposium on Precision Mechanical Measurements; 628009 (2006) https://doi.org/10.1117/12.715264
Event: Third International Symposium on Precision Mechanical Measurements, 2006, Urumqi, China

Abstract

In this paper, a set of experimental equipment is outlined which is designed to eliminate temperature change influence in stress measurement. A Fiber Bragg Grating (FBG) is fixed to a specially-structured cantilever, then the load brought to beat at the free end of cantilever. As the load exerted to the cantilever is changed, the stress of FBG changes. From the experiment, we can see that at the beginning of distortion caused by the load, the center wavelength of fiber grating changes, but the chirp effect is not obvious. As the load increases, the spectrum of reflecting peak becomes wider, and the chirp effect becomes more obvious, then two reflecting peaks appear, and the distance of two center wavelengths increases as linearity. When weights are added to 200g, two center wavelengths are 1548.25nm and 1548.43nm and the distance of them is 0.18nm. Experimental results indicate that the distance of two reflect peaks changes in linear relationship with the increasing of load on the free end of the cantilever, and the linearity is up to 0.96. Using this way to package FBG, the cross-sensitivity of stress and temperature can be conquered, and the error caused by temperature change in stress measurement can be eliminated. Therefore, the stress measurement can be realized by one fiber grating.

Citation Download Citation

Yutian Wang, Lifang Cao, Qinghua Wang, and Xuecai Liu "Research of eliminating temperature interference in stress measurement by fiber Bragg grating", Proc. SPIE 6280, Third International Symposium on Precision Mechanical Measurements, 628009 (13 October 2006); https://doi.org/10.1117/12.715264

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KEYWORDS

Fiber Bragg gratings

Temperature metrology

Refractive index

Modulation

Sensors

Reflection

Structured optical fibers

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