A system for eliminating burrs of magnetic displacement sensors in rail status monitoring

Abstract

The present invention provides a system for eliminating a burr phenomenon of a magnetic displacement sensor during rail state monitoring. The entire system can be integrated on an FPGA chip; each magnetic displacement sensor is controlled by a clock pulse generation module to carry out data collection in different monitoring periods, and convert the format and complete data output in the next monitoring period. Through the above design, the delay and synchronization in the measurement engineering can be strictly controlled, so that the magnetic displacement measurement accuracy only depends onthe high-speed, high-stability, high-precision clock reference and design algorithm, thereby avoiding the problems of complexity, instability, temperature drift and requirement for calibration when the traditional analog magnetic displacement sensor processes the low-level signals, and greatly improving the measurement precision. Since the whole system is synchronized to one clock, the logic timing sequences in the system are synchronized, thereby realizing time-sharing serial output of multichannel data in different measurement periods, which can prevent logic competition and remove the burrs.

Description

technical field [0001] The invention belongs to the technical field of railway operation monitoring, in particular to a system for eliminating the burr phenomenon of a magnetic displacement sensor during rail state monitoring. Background technique [0002] With the rapid development of high-speed railway technology, the mileage of seamless rails is rapidly increasing, and the monitoring of the infrastructure of high-speed rail operations - the working status of rails has attracted the attention of railway engineering departments; in the monitoring of rail status, it is necessary to measure the left and right rails at the same time The displacement, the displacement of the rail relative to the track slab, the displacement of the rail slab relative to the bridge slab, and the displacement of the rail’s arching and sagging require high-precision multi-channel simultaneous testing, and the accuracy requirement is better than 0.3mm; currently better The best measurement method is...

AI Technical Summary

Problems solved by technology

[0007] The existing magnetic displacement sensor control technology mostly uses A / D to collect analog output magnetic displacement sensors. Due to the problems of noise interference and DC level drift in the processing of low-level DC signals, it is very difficult to achieve an error of plus or minus 10 microns. of

Under the condition of a measurement range of 200mm, the resolution reaches 10 microns, and an analog-to-digital (A / D) converter (16bit) with a resolution of 1 / 20000 is required. The minimum input voltage is 1 millivolt, and the maximum input voltage is 20 volts, which not only increases In addition to the complexity and price of the circuit, it is difficult to achieve a stability of plus or minus 10 microns

For digital output magnetic displacement sensors, to achieve high resolution and precision, only programmable devices can be used to complete the control, because the high-speed microprocessor chip cannot adjust the timing, and there is no counter higher than 200MHz on the market (even if there is, It is also difficult to achieve high stability due to interference and time delay of external wiring), even if programmable array devices are used, if the circuit design is not reasonable, it is difficult to achieve high measurement accuracy

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