Object vibration spectrum measurement system based on laser

Abstract

The invention provides a device for carrying out spectrum measurement on a vibration object by utilizing the laser triangle vibration measurement technology. The measurement mode belongs to the long-distance non-contact measurement mode and is characterized by high precision, high interference resistance and extending stability. The object vibration spectrum measurement system based on the laser mainly comprises a signal acquiring part, a signal processing part and a spectrum analyzing part; the signal acquiring part has the operating principle that a stable focusable laser generator is adopted for generating the laser, and the laser is irradiated on a vibration object to be measured; two photoelectric cell sensors are arranged at 45 degrees from each other and are used for receiving the reflected laser with the object vibration information, as well as implementing photovoltaic conversion; the signal processing part has the operating principle that an AD620 precision instrument amplifier, an NE5532 optional amplifier and a Cortex-M4 single chip microcomputer are adopted for carrying out differential amplification, filter and amplification and AD sampling and storing on the converted electric signal; and the spectrum analysis part has the operating principle that the Cortex-M4 single chip microcomputer is utilized for carrying out FFT (Fast Fourier Transform Algorithm) on the sampled signal so as to obtain a frequency domain signal, and displaying the frequency domain distribution data in a graphic form by utilizing a display. By adopting the object vibration spectrum measurement system based on the laser, a user can conveniently see the vibration information of the measured object.

Description

technical field [0001] The invention relates to a device for measuring the frequency spectrum of a vibrating object by using laser triangular vibration technology. In addition, the device can also store and restore the vibration information of the object. Background technique [0002] The measurement and analysis of vibration characteristics is an important means to identify and determine the reliability of machines and components; the commonly used vibration measurement technology is contact measurement; an acceleration sensor is installed on the measured object, and the acceleration sensor’s charge output signal is used to achieve acceleration- Velocity-displacement related measurement; if the vibration of an object with a small mass is measured, the quality of the additional acceleration sensor will often affect the vibration of the measured object, resulting in measurement errors; design and develop a new type of non-contact, high-precision, real-time Vibration measureme...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the measurement error caused by the vibration of the sensor along with the object in the contact vibration measurement technology or the problem that the acoustic wave method in the non-contact vibration measurement technology is susceptible to environmental interference, the invention provides a device that uses laser triangulation Vibration measurement technology belongs to long-distance non-contact measurement. This technology has the advantages of strong anti-interference and good stability. In addition, the device can also store the vibration information of objects in the form of data, and restore the vibration information when necessary.

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