Field calibration system for magnetoelectric sensor

Abstract

The invention provides a field calibration system for a magnetoelectric sensor. The field calibration system for the magnetoelectric sensor comprises a digital acquisition device, a calibration circuit and a signal processing device; the digital acquisition device is provided with a voltage signal output end, a first signal input end and a second signal input end; the calibration circuit is provided with an excitation signal output end and a calibration signal output end; a voltage signal output end of the digital acquisition device is used for being connected with the excitation signal output end of the calibration circuit; the excitation signal output end of the calibration circuit is used for being connected with a magnetoelectric sensor to be calibrated; the calibration signal output end of the calibration circuit is connected with a first signal input end of the digital acquisition device; a second signal input end of the digital acquisition device is used for being connected with the magnetoelectric sensor to be calibrated and receiving vibration signals of the magnetoelectric sensor; the signal processing device is connected with the digital acquisition device, and is used for receiving two paths of signals from the digital acquisition device.

Description

technical field [0001] The invention relates to the field of vibration measurement calibration, in particular to a magnetoelectric sensor calibration system. Background technique [0002] In the field of earthquake detection and engineering vibration measurement, a large number of vibration measurement sensors are often required for long-term monitoring of the ground, engineering structures, and mechanical equipment. For example, in terms of strong earthquake observation, there are more than 30,000 sets of data used for earthquake observation worldwide, and the sensors deployed in structural health monitoring and environmental vibration monitoring are much higher than this number, and these sensors often have to work continuously for several years. Therefore, its on-site calibration technology has a large number of practical needs. The currently existing technologies that can be used for the calibration of magnetoelectric sensors have the following problems: [0003] 1. Th...

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Problems solved by technology

[0003] 1. The anti-interference ability of the high-frequency part is poor. No matter whether the step signal or the unit pulse signal is used, the signal-to-noise ratio of the high-frequency band cannot be guaranteed, and it is only suitable for long-term calibration;

[0004] 2. When traditionally using sinusoidal signals for calibration, although the input signal can be adjusted to ensure the signal-to-noise ratio in the high-frequency band, the error of the actual test results in the high-frequency band can reach 30%, which cannot be used as a basis for judging whether the sensor is damaged;

[0005] 3. White noise and pseudo-random binary signals have strong anti-interference, but need to know the frequency characteristic or transfer function of the sensor to complete the convolution operation

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