System for measuring micro vibration by using femtosecond laser and micro vibration measuring method

Abstract

The invention specifically relates to a system for measuring micro vibration by using a femtosecond laser based on balanced optical cross-correlation and a micro vibration measuring method, and belongs to the field of photoelectric precision measurement. The system comprises a microwave atomic clock, an optical fiber femtosecond laser, servo control equipment, data acquisition equipment, an upper computer and an optical measurement assembly. The basic principle of the system is a balanced optical cross-correlation principle. Femtosecond pulses emitted by the locked femtosecond laser pass through the optical measurement assembly, the data acquisition equipment acquires optical signals, output signals respectively get into the servo control equipment and computer processing equipment, the servo control equipment controls the repetition frequency of the laser, and the computer outputs a measurement result in real time. The greatest advantage of the method lies in that the method is sensitive in measurement and simple in data processing, and the method is mainly used for realizing high-precision micro vibration measurement in real time. The system and the method provided by the invention can be applied to measurement for one-dimensional micro vibration signals and calibration for a micro vibration sensor, and can also be used for manufacturing vibration measurement instrument and equipment and the like.

Description

technical field [0001] The invention specifically relates to a micro-vibration measurement system and a micro-vibration measurement method using a femtosecond laser based on balanced optical cross-correlation, and belongs to the field of photoelectric precision measurement. Background technique [0002] Vibration is a basic physical phenomenon in nature, and many applications need to obtain velocity, displacement, and so on. Acceleration, etc. describe the physical quantity of vibration. The three parameters are both different and interrelated, and have a definite functional relationship. Velocity is a differential variable of displacement, while acceleration is a differential variable of velocity. Vibration amplitude, vibration frequency, and vibration phase delay are the end results of measurement concern. Being able to measure these parameters precisely is significant. [0003] Laser vibration measurement can realize long-distance and non-contact measurement, and has s...

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of low measurement accuracy, complex data processing process and difficult instrument debugging in the prior art, and to provide a high-precision, real-time micro-vibration micro-vibration system and micro-measurement system using femtosecond laser vibration method

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