Displacement sensor calibration device and method based on rotary table

Abstract

The invention discloses a displacement sensor calibration device and method based on a rotary table. The calibration device comprises the rotary table; a spherical detection block; the displacement sensor probe detects the distance between the probe and the surface of the spherical detection block to obtain a displacement signal; the displacement sensor conditioning circuit converts the displacement signal into a voltage signal and transmits the voltage signal to the data acquisition card; the angle encoder is used for measuring the angle of the rotary table, outputting a pulse signal and transmitting the pulse signal to the data acquisition card; the data acquisition card is used for sending the voltage signal and the pulse signal to the industrial personal computer; and the industrial personal computer is used for converting the pulse signal into an angle signal and fitting the voltage signal and the angle signal. The calibration method comprises the following steps: adjusting the relative position of the displacement sensor probe and the spherical detection block to an initial position, sequentially moving from the initial position to n angular positions to obtain n voltage signals ui and angle signals delta theta i, further calculating displacement data delta di, and fitting the voltage signals ui and the displacement data delta di to obtain sensitivity and zero offset. And accurate calibration of the displacement sensor is realized by using the angular motion function of the rotary table.

Description

technical field [0001] The invention belongs to the technical field of sensor calibration and testing, and particularly relates to a turntable-based displacement sensor calibration device and method. Background technique [0002] Displacement sensors are mainly used to measure various forms of displacement, vibration signals, etc., capacitive displacement sensors, eddy current displacement sensors, etc. are commonly used in engineering. Before the displacement sensor is used, its sensitivity coefficient should be calibrated with a standard measuring instrument, so as to determine the corresponding relationship between the input quantity and the output quantity. However, during the use of the displacement sensor, with the change of the working environment and the aging of the electronic components used, the sensitivity coefficient will also change. If it is not calibrated in time, measurement errors will occur, which will affect the accuracy of the final measurement. [0003...

AI Technical Summary

Problems solved by technology

In actual engineering, some workplaces do not have a linear motion test device, and the displacement sensor cannot be calibrated

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