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

A femtosecond laser, femtosecond laser technology, applied in the use of wave/particle radiation, measurement devices, measurement of ultrasonic/sonic/infrasonic waves, etc. Simple processing and high test sensitivity

Active Publication Date: 2017-01-04
BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA
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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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  • System for measuring micro vibration by using femtosecond laser and micro vibration measuring method
  • System for measuring micro vibration by using femtosecond laser and micro vibration measuring method
  • System for measuring micro vibration by using femtosecond laser and micro vibration measuring method

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with the embodiments and accompanying drawings.

[0026] Such as figure 2 As shown, a system using femtosecond laser to measure microvibration includes microwave atomic clock, fiber femtosecond laser, servo control equipment, data acquisition equipment, host computer and optical measurement components.

[0027] The microwave atomic clock provides a reference for the microwave frequency counter, and can realize the traceability of the measurement reference.

[0028] The fiber-optic femtosecond laser locks the repetition rate and offset frequency to the microwave atomic clock, thereby providing the stability of high-precision measurement for the microvibration device and providing a stable light source for the optical measurement system.

[0029] The servo control device adjusts the pulse interval to ensure that the balanced cross-correlation signal of the measurement pulse light and the reference puls...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H9/00
CPCG01H9/00
Inventor 武腾飞韩继博王宇
Owner BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA
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