Magnitude-phase absolute calibration device of high-temperature vibration sensor

Abstract

The invention provides a magnitude-phase absolute calibration device of a high-temperature vibration sensor. A cylindrical vibration extension rod is fixedly arranged above a standard vibration table, a calibrated sensor is arranged on the top end of the vibration extension rod, and the top of the vibration extension rod and the calibrated sensor are arranged in a high-temperature test chamber; a laser interferometer is arranged outside the high-temperature test chamber; a thermocouple or a platinum resistor is arranged in the high-temperature test chamber which is heated by a heating device; the calibrated sensor is connected with a conditioning amplifier outside the high-temperature test chamber through a high-temperature resistant signal line, and the conditioning amplifier is connected with a data acquisition card; the laser interferometer is connected with a photoelectric converter which is connected with the data acquisition card; the data acquisition card is connected with a computer; the standard vibration table is connected with a power amplifier which is connected with a signal source. According to the magnitude-phase absolute calibration device, the high-temperature test chamber is used for providing high temperature, and the laser interferometer is used as a vibration standard, so as to realize the calibration on sensitivity amplitude and phase of the vibration sensor at high temperature.

Description

technical field [0001] The invention belongs to the technical field of vibration measurement and is applied to the measurement of a high-temperature vibration sensor, in particular to an amplitude-phase absolute calibration device for a high-temperature vibration sensor. Background technique [0002] Vibration sensors are widely used in various links in the scientific research, production and testing process of national defense and military industry, and are responsible for monitoring and testing functions under various environmental conditions. It has been found through research that temperature changes have a great influence on the sensitivity of the vibration sensor. This is because most vibration sensors are composed of piezoelectric materials. According to the characteristics of piezoelectric materials, when it works outside the reference working temperature (room temperature), its output Charge sensitivity will vary greatly. The test error caused by the temperature in...

AI Technical Summary

Problems solved by technology

[0004] Vibration sensor manufacturers at home and abroad have been able to produce vibration sensors used at high temperatures. Generally, the calibration of factory indicators is completed by the comparative method. There is no calibration device for the absolute method of high-temperature vibration sensor amplitude sensitivity and phase calibration at home and abroad.

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