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A fiber Bragg grating (FBG) based geophone is designed for low-frequency signal detection has high acceleration response of about 60 dB re pm/g in a low frequency range of 5 Hz ~60 Hz. To Guarantee normal operation in field test and practical application, an acceleration amplitude restriction is added in the mechanical design of the FBG geophone. Then a series of environmental and reliability test have been proceeded with online or offline monitoring of its working performance, including high and low temperature test, vibration test, shock test and free drop test. All the tests are planned according to National standard or Oil & Gas Industry Standard. And the experimental results indicate that our FBG geophone meet the criterion of oil and gas industry product and is capable of field application.
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Xiaolei Zhang, Li Min, Ming Li, Shaodong Jiang, Faxiang Zhang, Zhihui Sun, Jiasheng Ni, Gangding Peng, Chang Wang, "Environmental and reliability test of FBG based geophone as geophysical exploration instrument," Proc. SPIE 10464, AOPC 2017: Fiber Optic Sensing and Optical Communications, 1046428 (25 October 2017); https://doi.org/10.1117/12.2285751