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Laser doppler speed meter with atom Faraday frequency discrimination and stabilization

A Faraday effect, atomic technology, applied in the field of laser velocimeters, can solve the relative frequency drift, affecting the measurement accuracy of laser Doppler velocimeters, etc., to eliminate measurement errors, improve stability and accuracy, and improve measurement accuracy. Effect

Inactive Publication Date: 2006-08-02
WUHAN INST OF PHYSICS & MATHEMATICS CHINESE ACADEMY OF SCI
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Problems solved by technology

In this way, there will be irregular relative frequency drift between the discrimination frequency and the laser frequency
In addition, this laser Doppler velocimeter uses intensity detection to measure the Doppler frequency shift of the scattered echo, which affects the measurement accuracy of the laser Doppler velocimeter

Method used

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  • Laser doppler speed meter with atom Faraday frequency discrimination and stabilization
  • Laser doppler speed meter with atom Faraday frequency discrimination and stabilization
  • Laser doppler speed meter with atom Faraday frequency discrimination and stabilization

Examples

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Embodiment Construction

[0021] The invention consists of three parts: an atomic light feedback frequency-stabilized semiconductor laser 1 , an echo light receiving detector 2 and a signal processor 3 .

[0022] An atomic optical feedback frequency-stabilized semiconductor laser 1 is composed of a semiconductor laser component 4 , a collimator component 5 , an atomic Faraday effect device 6 and an output coupler 7 . The frequency of the semiconductor laser component 4 is stabilized on a transmission peak of the atomic Faraday effect frequency stabilization device 6 through optical feedback, and the output frequency of the frequency stabilization laser can be adjusted within a certain range by adjusting the magnetic field and temperature of the atomic Faraday effect frequency stabilization device 6 .

[0023] The scattered echo light receiving detector 2 is composed of a receiving telescope 10 , a beam splitter 8 , an atomic Faraday effect frequency discrimination device 9 , and photodetectors 11 and 1...

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Abstract

A tachometer is composed of semiconductor laser of atomic light feedback frequency stabilization mode, receiving detector of scattering return wave light and signal processor. The Faraday effect component is applied in frequency discrimination for frequency stabilization and scattering return wave light of the semiconductor laser to make frequencies of both establish on transit reference of atomic spectral line at both of stable and accurate way, simultaneously proportional detection method is used to measure Doppler frequency shiaft of scattering return wave light to eliminate error caused by strength variation of the scattering return wave light.

Description

Technical field: [0001] The invention relates to a laser velocimeter, in particular to a laser Doppler velocimeter with atomic Faraday effect frequency discrimination and frequency stabilization, which can be used to detect the speed of tangible objects and invisible objects (such as wind). Background technique: [0002] The principle of the laser Doppler velocimeter is: irradiate the measured object with a beam of laser light, measure the Doppler frequency shift of the echo light scattered from the moving object, and then obtain the moving speed of the measured object from this frequency shift. Let the laser frequency be f 0 , the Doppler frequency shift of the echo of the moving object is Δf, then the moving speed of the object is: υ = c 2 f 0 Δf , where c is the speed of light. In general, the Doppler shift Δf of the scatte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01P3/50G01S17/58
Inventor 龚顺生李发泉程学武戴阳王嘉珉
Owner WUHAN INST OF PHYSICS & MATHEMATICS CHINESE ACADEMY OF SCI
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