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Yangyi Pan

at Hohai university

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Proceedings Article | 31 October 2022 Paper

Design of bridge gap detection and processing circuit based on grating sensor

Yangyi Pan

Proceedings Volume 12457, 124570Y (2022) https://doi.org/10.1117/12.2660624

KEYWORDS: Amplifiers, Sensors, Linear filtering, Oscilloscopes, Electronic filtering, Optical design, Bridges, Interference (communication), Device simulation, Signal processing

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The state of the bridge directly affects the service status of the high-speed railroad, and the beam seam variation over the limit will bring safety hazards to the high-speed running trains. Based on this, this paper proposes the design of the processing circuit of the beam seam monitoring scheme based on grating sensors. The method of the processing circuit mainly includes the instrumentation amplifier circuit with high common-mode rejection ratio, the second-order active gain low-pass filter to filter out the high-frequency noise caused by unstable factors such as high-speed train impact, the shaping circuit consisting of a double-limit comparator with 50% output duty cycle, and the most important one, which can The design of the discriminative circuit to identify the direction of movement.Finally, through Multisim 13.0 simulations, we conclude that the amplifier circuit is similar to the theoretical calculation but with a phase shift; the filter circuit can effectively filter out the noise of high-speed train shocks, and the output waveform is similar to a sinusoidal signal; the shaping circuit is the same as the theoretical one, with only a very weak phase shift; and the discriminator circuit proves that it can effectively output pulse waveform.

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