Side slop optical fiber Bragg optical grating multi-point displacement sensor and using method thereof

Abstract

The invention relates to a side slope optical fiber Bragg optical grating multi-point displacement sensor and a using method of the side slope optical fiber Bragg optical grating multi-point displacement sensor and belongs to the field of photoelectron measuring technologies. The displacement sensor comprises an upper end flange plate, an upper end elastic protection ring sleeve, an upper end pull rod, an upper end displacement spring, a protection steel tube, an elastic steel disc, optical fiber Bragg optical gratings, a lower connection leading-out optical fiber, an upper connection leading-out optical fiber, a steel tube optical fiber leading-out hole, a lower end displacement spring, lower end pull rod, a lower end flange plate and a lower end elastic protection ring sleeve. According to the relational expression between the displacement value Delta Lambda Beta of the central wavelength of the optical fiber Bragg optical gratings adhering to the elastic steel disc and the displacement L of the sensor, the displacement changes, caused by the displacement of side slope hole soil layers or cracking of rock stratums, of the measuring position are calculated. According to different monitoring requirements, different numbers of displacement sensors can be connected in series to achieve multi-point displacement monitoring in side slope holes; the optical fiber Bragg optical gratings are adopted, so that the anti-electromagnetic interference capacity and the corrosion resistance capacity are high; the structure is simple, and operation is convenient.

Description

technical field [0001] The invention relates to a side slope optical fiber Bragg grating multi-point displacement sensor and a using method thereof, belonging to the technical field of optoelectronic measurement. Background technique [0002] my country is a mountainous country, and the mountainous area accounts for about 2 / 3 of the country's total area. It is one of the countries with frequent landslides in the world. The landslide activity is related to the composition material, mechanical properties, shape, stratification, weak surface, structural surface and other factors of the landslide body, and the mechanism is relatively complicated. Internal displacement monitoring of slopes has always been an important topic concerned by geotechnical engineering circles. For the monitoring of deep displacement of rock and soil, sensors such as bedrock displacement gauges and multi-point displacement gauges are generally used. The sensing unit is installed at the position of the o...

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Problems solved by technology

[0004] The invention provides a slope optical fiber Bragg grating multi-point displacement sensor and its use method to solve the problem of real-time online detection of slope multi-point displacement

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