Multi-path grating ruler signal acquiring and measuring system

Abstract

The invention discloses a multi-path grating ruler signal acquiring and measuring system. The multi-path grating ruler signal acquiring and measuring system comprises a plurality of grating rulers, multiple paths of grating signal acquiring and measuring devices and a computer data acquiring and processing system, wherein the grating rulers are connected with aviation sockets of the multiple paths of grating signal acquiring and measuring devices by grating ruler signal wires; the multiple paths of grating signal acquiring and measuring devices are connected with the computer data acquiring and processing system by signal output connecting wires and high-speed connecting serial ports. According to the multi-path grating ruler signal acquiring and measuring system disclosed by the invention, the grating rulers with different resolutions and ranges can be connected by only setting in the computer data acquiring and processing system; an ARM high-speed processing module is adopted, the system is controlled by a computer, the measuring precision can reach 0.1 micron and the operation is simple; a plurality of acquiring and measuring devices are in series connected by the serial ports and are connected by virtue of one computer by setting the case number of each acquiring and measuring device; each acquiring and measuring device is provided with an aviation socket, so that the aviation sockets of the grating ruler data wires can be conveniently inserted to the acquiring and measuring devices.

Description

technical field [0001] The invention relates to an automatic collection and analysis system for displacement data, in particular to a multi-channel grating ruler signal collection and measurement system with built-in miniature multi-point displacement data in a flexible transfer type used in geomechanics model tests. Background technique [0002] At present, there are many kinds of multi-point displacement test methods used in actual engineering sites at home and abroad, but the miniature multi-point displacement test system used in geomechanics model test is still rare. [0003] A relatively successful example in China is the differential transformer-type multi-point displacement test system invented by Professor Li Zhongkui of Tsinghua University, and applied to the geomechanical model test of the cavern group of Xiluodu Hydropower Station. The resistance sensor is used to measure the displacement, and the measurement accuracy can reach as high as 0.001mm, but the resistan...

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Problems solved by technology

[0005] 1. The signal conversion system and the data acquisition hardware system (data acquisition cabinet) are separated, and the connection of the data signal lines is inconvenient, which is not conducive to the accurate measurement of the displacement measurement results of the model test;

[0006] 2. The signal acquisition and processing is carried out by PLC, and the response speed is slow. When the grating ruler moves fast, it is easy to lose frames, and the displacement measurement is inaccurate, which seriously affects the test results;

[0007] 3. The interface of the data acquisition and analysis software system is relatively simple. It only has the functions of data clearing, data acquisition display and simple historical curve, and the sampling period is not adjustable.

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