Vector optical fiber sensing probe based on optical fiber interferometer and underground vector accelerometer
A technology of optical fiber sensing probe and optical fiber interferometer, which is applied in the directions of measurement of acceleration, multi-dimensional acceleration measurement, velocity/acceleration/impact measurement, etc. It can solve the problems of low sensitivity of accelerometer and limited working characteristics of fiber grating, and achieve improved utilization rate, the effect of improving sensitivity
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[0086] Implementation Case——Application of Cantilever Beam Downhole Vector Accelerometer Based on Optical Fiber Interferometer in Deep Well Seismic Observation
[0087] A cantilever beam downhole vector accelerometer based on fiber optic interferometer such as figure 2 , 3 As shown, the observation system when the accelerometer is applied to a deep well is as follows figure 1 As shown, the observation system includes a signal processing system 1, a signal acquisition system 2, an optical fiber sensing probe 3, an optical cable 4, a data signal line 5, an optical cable winch 6, a pulley bracket 7, a well wall fixing device 8 and a deep well drilling 9 and peripheral equipment. The device parameters and structure dimensions of each part are as follows:
[0088] 1) The light source 202 is a laser light source with a center wavelength of 1550nm, a half-spectrum width of less than 20nm, a power of 10mW, and a modulation frequency of not less than 20K;
[0089] 2) The working w...
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