Calibration measurement method and system for single-frequency steady-state sine machinery vibrating amplitude phase characteristic

Abstract

The present invention belongs to the field of metering measurement technology, in the concrete, it relates to a calibration measurement method of vibration and its calibration measurement system. Said invention provides an improved homodyne time interval method based on general Michelson laser interferometer, said method can reduce the computing quantity due to noise signal and can simplify zero-crossing point position judgment. The invented calibration measurement system includes Michelson laser interferometer, computer and synchronous data acquisition card. Said invention can be used for calibrating work of acceleration sensor.

Description

technical field [0001] The invention relates to the field of measurement and measurement, in particular to a calibration measurement method and a calibration measurement system for the amplitude and phase characteristics of mechanical vibration. Background technique [0002] In the field of metrology and measurement of linear mechanical vibration, acceleration sensors are commonly used as standard instruments for value transmission or working instruments for on-site measurement. The acceleration sensor can output a correspondingly changed electrical signal when it senses changes in the acceleration of mechanical vibration. Under the excitation of single-frequency steady-state sinusoidal vibration, the sensitivity amplitude of the acceleration sensor is defined as the ratio of the single peak value of the output power (voltage or charge) of the acceleration sensor to the single peak value of the input mechanical vibration acceleration at a specific vibration frequency, the un...

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Problems solved by technology

Due to the large amount of data, the calculation speed is slow, especially under the commonly used calibration acceleration, when the frequency is low, due to the large number of original sampling points, it takes a long time to complete this calculation process

[0018] (3) In this document, no specific calculation methods and steps are disclosed for the various waveforms that appear during the calculation of the instantaneous velocity sequence, and only this step is mentioned in general, which needs to be considered by the user

[0019] Therefore, the method of this prior art is subjected to very big restriction when applying

[0020] At the same time, when using this prior art to calibrate the acceleration sensor, a corresponding hardware system is required. The signal acquisition uses a VXI two-channel high-speed synchronous digitizer with a sampling rate above 50MSa / s, and the VXI two-channel high-speed synchronous digitizer must be equipped with a VXI Dedicated chassis and dedicated controller for the bus

This leads to the extremely expensive overall price of the data acquisition and processing part of the calibration system. At present, the price of a dedicated VXI chassis in the domestic market is tens of thousands of yuan, and the price of a dedicated VXI controller is also more than tens of thousands of yuan, while the price of a two-channel high-speed synchronous digitizer Up to more than ten thousand yuan

[0021] Therefore, the existing calibration system is very expensive, which seriously limits the popularization and application

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