Monitoring crustal movements in northern Tianshan Mountain based on GPS technology

Vilayev, Andrey; Zhantayev, Zh.; Bibosinov, A.Zh.

doi:10.1016/j.geog.2017.03.006

Cited by 5 publications

(1 citation statement)

References 3 publications

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“…The monitoring technology and research on in-situ stress in China began in the 1960s, and developed rapidly in the following decades. At present, the relative monitoring technology used for crustal rock stress mainly includes GPS monitoring technology [10][11][12], Interferometric Synthetic Aperture Radar (InSAR) technology [13][14][15], and borehole strain observation technology [16][17]. Both GPS and InSAR methods can not only measure the displacement of the monitoring point in the monitoring time interval, but also derive the corresponding strain using the equation, but such methods are easily affected by the natural environment and human factors in the actual measurement, with low measurement accuracy.…”

Section: Introductionmentioning

confidence: 99%

Extrinsic Optical Fiber Pressure Sensor Based on F-P Cavity

Cai¹,

Wang²,

Wu³

et al. 2020

I2M

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Aiming at the problems of the in-situ stress monitoring sensor such as susceptibility to lightning strikes and low accuracy, this paper attempts to design one extrinsic pressure sensor based on the optical fiber sensing technology and F-P interferometer. To this end, it first introduces the structural design of the sensor, which is mainly composed of sensitive diaphragm, single-mode fiber and ceramic ring. The use of silver-plated diaphragms in the air cavity can increase the light reflectivity, thereby improving the monitoring accuracy; the insulating anti-electromagnetic interference material can make the sensor less susceptible to lightning strikes and reduce the risk of damage to the sensor due to lightning strikes. Then, the ANSYS simulation software was used to statically analyze the silverplated diaphragm of the sensor, and obtain the ideal radius and thickness values of the silver-plated diaphragm. Furthermore, to verify the accuracy and lightning protection performance of the extrinsic fiber pressure sensor based on F-P cavity in actual stress measurement, an in-situ stress monitoring experiment platform and a simulated lightning strike experiment platform were built. The pressure and temperature calibration experiments and sensor stress loading simulation showed that the sensor has a cavity length change sensitivity of 1677nm/MPa within 0-10MPa and a stress measurement resolution of 60Pa; compared with the common fiber grating method for in-situ stress measurement, the monitoring accuracy of the designed sensor has improved about 3 times; the lightning strike experiment found by using a lightning surge generator that the designed sensor has a stable operating and anti-lightning performance under the test voltage of 0.5kV. The research findings shed light on the further study of F-P cavity-based extrinsic fiber pressure sensor.

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