Non-contact structure micro-vibration monitoring device

Abstract

The invention relates to a non-contact structure micro-vibration monitoring device which is characterized by comprising a heat light source, lenses, a small hole, a spectroscope, a reference lens, a vibration structure to be detected, an optical fiber, a spectrograph and a computer with a data acquisition and processing system, wherein the heat light source, the small hole, the lenses, the spectroscope and the vibration structure to be detected form a linear array, the reference lens, the spectroscope and the lens are arranged in a vertical direction of the linear array; an optical path signal of the lens is connected to one end of the optical fiber, the other end of the optical fiber is connected to the input end of the spectrograph, and the output end of the spectrograph is connected with the computer with the data acquisition and processing system through a communication bus. The device can realize that the vibration, especially the micron-sized vibration of the structure can be accurately monitored in real time on line. The device is used for directly measuring the vibration displacement of the structure with detection accuracy reaching submicron size.

Description

technical field [0001] The invention belongs to the technical fields of photomechanics, vibration state monitoring and analysis, etc., and particularly relates to a non-contact structure micro-vibration monitoring device. Background technique [0002] Existing vibration monitoring mostly adopts contact measurement, such as the measurement method of piezoelectric acceleration sensor. This type of acceleration sensor is usually fixed by wax or small bolt structure when installing. In general, wax will affect the measurement of structural damping; the additional weight of the small bolt structure and the acceleration sensor itself will affect the mode of the structure and cause errors in structural vibration measurement, especially for lighter structures. Moreover, the frequency range that the acceleration sensor can measure has a minimum value, the so-called "cut-off frequency", generally at 0.1 ~ 1 Hz, which limits the measurement of ultra-low frequency vibrations. In the ...

AI Technical Summary

Problems solved by technology

In general, wax will affect the measurement of structural damping; the additional weight of the small bolt structure and the acceleration sensor itself will affect the mode of the structure and cause errors in structural vibration measurement, especially for lighter structures

Moreover, the frequency range that the acceleration sensor can measure has a minimum value, the so-called "cut-off frequency", generally at 0.1 ~ 1 Hz, which limits the measurement of ultra-low frequency vibration

Images