Rod type extensometer for measuring distance change of two horizontal points of reservoir dam

Abstract

The invention provides a rod type extensometer for measuring the distance change of two horizontal points of a reservoir dam, and the extensometer comprises a measurement end, a fixed end, a suspension spring suspension device, a base line, a calibration device, a sensor, and an electrical unit, one end of the base line is connected to the fixed end, the other end is connected with a measurement end iron core of the sensor, and the sensor is fixed at the measurement end. The measurement end is a micro-displacement platform and is composed of an upper-layer platform and a lower-layer platform,the lower-layer platform is fixed to a dam body, and the calibration device is connected with the upper-layer platform and can drive the upper-layer platform to move in the horizontal direction relative to the lower-layer platform; the electrical unit comprises a single-chip microcomputer, a lightning protection anti-interference circuit, a power supply module, a signal conditioning circuit, an optical coupler isolation circuit, a 485 signal conversion circuit and a digital signal output circuit. The rod type extensometer is simple in structure, easy to install and stable and reliable in long-term work, and meanwhile, the rod type extensometer is provided with a lightning protection anti-interference design and can realize long-distance digital signal transmission.

Description

technical field [0001] The invention provides a rod-type extensometer for measuring the distance change between two horizontal points of a reservoir dam, in particular relates to a rod-type extensometer for high-precision detection based on a differential displacement sensor, belonging to the technical field of reservoir dam safety detection. Background technique [0002] With the development of social and economic construction and the advancement of science and technology, my country has begun to build a large number of reservoir dams to prevent natural disasters such as floods and to better use water resources to benefit mankind. At present, my country has the largest number of dams in the world There are more than 600 large reservoir dams in China, and there are also a huge number of various small reservoir dams. In the annual flood control and flood control work conference, government departments will put forward that it is necessary to ensure the safety of reservoirs and...

AI Technical Summary

Problems solved by technology

[0011] 1. The mechanical mechanism of the measuring point is complex and heavy, and the installation is inconvenient;

[0012] 2. The baseline is made of ordinary stainless steel wire, and it needs to be straightened with a counterweight. The tension will cause deformation, and the deformation of the steel wire itself will cause a certain error in the measurement results. At the same time, because the sensor core is not designed with a central guide device, it is easy to communicate with the sensor. Differential Coil Friction

[0013] 3. After a long time, the high-strength stainless steel wire is easily broken

[0014] 4. Unable to perform on-site calibration

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