Calibration device and method of laser Doppler velocimeter based on lithium niobate modulator

A technology of Doppler velocimeter and calibration device, which is applied in the direction of measuring device, testing/calibration of velocity/acceleration/shock measurement equipment, instruments, etc., and can solve problems such as difficult to meet the detection and calibration of laser Doppler velocimeter, Achieve the effect of simple structure, high detection and calibration accuracy, and wide speed range

Active Publication Date: 2022-03-08
XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0005] In order to solve the problem that the existing technology is difficult to meet the detection and calibration of the laser Doppler velocimeter with a higher speed measurement range, the present invention provides a high-precision, traceable and easy-to-operate method for the detection and calibration of the laser Doppler velocimeter. Detection and calibration device and method

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  • Calibration device and method of laser Doppler velocimeter based on lithium niobate modulator
  • Calibration device and method of laser Doppler velocimeter based on lithium niobate modulator
  • Calibration device and method of laser Doppler velocimeter based on lithium niobate modulator

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[0028] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention, and are not intended to limit the protection scope of the present invention.

[0029] Such as figure 1 As shown, the calibration device of the laser Doppler velocimeter based on the lithium niobate modulator provided by the present invention includes a lithium niobate modulator 7, a radio frequency signal amplifier 8, a signal source 10, an optical fiber isolator 6, a first optical fiber coupler 4. The second fiber coupler 11 , the third fiber coupler 12 and the fiber beam expander 3 . The laser Doppler velocimeter 1 to be detected is arranged at one end of the optical fiber beam expander 3, and the other end of the optical fiber beam expander 3 is connected with one end of the first optical fiber couple...

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Abstract

The invention provides a calibration device and method for a laser Doppler velocimeter based on a lithium niobate modulator. The calibration device and method mainly solve the problem that in the prior art, detection and calibration of the laser Doppler velocimeter in a high speed measurement range are difficult to meet. The calibration device comprises a lithium niobate modulator, a radio frequency signal amplifier, a signal source, an optical fiber isolator, a first optical fiber coupler, a second optical fiber coupler, a third optical fiber coupler and an optical fiber beam expander. According to the device and the method, the standard speed is generated through a Doppler signal simulation method, the measurement precision can be obtained according to the standard speed and the measurement speed, the detected laser Doppler velocimeter is calibrated, and the highest standard speed which can be simulated theoretically exceeds 10km / s.

Description

technical field [0001] The invention belongs to the field of laser Doppler velocity, acceleration, vibration and displacement measurement, and specifically relates to a laser Doppler velocimeter calibration device and method based on a lithium niobate modulator, which is used to realize the laser Doppler velocimeter High-precision, traceable and easy-to-operate testing and calibration. Background technique [0002] Laser Doppler speed measurement technology is a high-precision non-contact speed measurement technology based on the optical Doppler effect. At the same time, based on the speed measurement data, it can perform indirect measurement of acceleration, vibration and displacement. It has high measurement accuracy, non-contact and Anti-electromagnetic interference and other advantages are widely used in various occasions. [0003] When the laser Doppler velocimeter is used, it needs to be calibrated. The conventional detection and calibration method of the laser Dopple...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01P21/02
CPCG01P21/02Y02A90/10
Inventor 郝歌扬吴国俊杨钰城吕小鹏
Owner XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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