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Laser Doppler velocity-measuring system with all-optical fiber light-frequency modulation

A technology of Doppler speed measurement and laser modulation, which is applied in the field of optical measurement, can solve the problems of low accuracy of laser speed measurement and unreasonable optical system structure, etc., and achieve the effect of low environmental cleanliness requirements, light weight and small volume

Inactive Publication Date: 2013-01-02
11TH RES INST OF CHINA ELECTRONICS TECH GROUP CORP
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  • Abstract
  • Description
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Problems solved by technology

[0019] In view of the above analysis, the present invention aims to provide an all-fiber optical frequency modulation laser Doppler velocity measurement system to solve the problems of low laser velocity measurement accuracy and unreasonable optical system structure in the prior art

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  • Laser Doppler velocity-measuring system with all-optical fiber light-frequency modulation
  • Laser Doppler velocity-measuring system with all-optical fiber light-frequency modulation
  • Laser Doppler velocity-measuring system with all-optical fiber light-frequency modulation

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Embodiment Construction

[0053]Preferred embodiments of the present invention will be specifically described below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the application and are used together with the embodiments of the present invention to explain the principles of the present invention. For the sake of clarity and simplicity, detailed descriptions of known functions and constructions in the devices described herein will be omitted when it may obscure the subject matter of the present invention.

[0054] Such as figure 1 as shown, figure 1 It is a schematic structural diagram of the system described in the embodiment of the present invention, which may specifically include: a laser emitting unit, a λ / 2 wave plate, a beam combiner, a transceiver isolator, a λ / 4 wave plate, a laser lens, a beam combiner, and a receiving detector And a computing unit, wherein the laser emitting unit specifically includes: a laser, a frequency modulator, a b...

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Abstract

The invention discloses a laser Doppler velocity-measuring system with all-optical fiber light-frequency modulation. The system comprises a laser emission unit, a transceiving isolator, a laser lens, a beam combiner, a receiving detector and a computation unit, and the all optical functional units or devices are connected mutually by optical fibers. By using the system, the detection sensitivity of a laser Doppler velocity-measuring technology reaches quantum noise theory limit, and an optical system of the laser Doppler velocity-measuring technology is upgraded completely. A laser Doppler velocity-measuring meter using a new technology has the advantages that the power consumption is lower, the volume is smaller, the weight is lighter, the structure layout is more reasonable, the construction is more convenient, a transmitting lens and a receiving lens become one, no sensitiveness to impact vibration and high-low temperature changes exists, and requirement for cleanness degree of environment is low.

Description

technical field [0001] The invention relates to the technical field of optical measurement, in particular to an all-fiber optical frequency modulated laser Doppler velocity measuring system. Background technique [0002] Laser Doppler velocity measurement technology is recognized as the best method for non-contact measurement, whether it is solid, fluid or gas velocity can be measured, widely used in aerospace, ground monitoring, hydraulics, fluid mechanics, wind tunnel diagnosis, etc. In many fields, it has broad application prospects in both military and civilian fields. [0003] Laser Doppler velocimetry technology is one of the comprehensive applications of laser measurement, interferometry, photoelectric measurement and optical metrology, and is a bright spot of photoelectric instruments. Laser Doppler speed measurement technology uses a laser beam to irradiate the measured target. When the measured target moves, the Doppler effect is generated in the reflected light w...

Claims

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Application Information

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IPC IPC(8): G01S17/58G01P5/26
Inventor 吴健眭晓林
Owner 11TH RES INST OF CHINA ELECTRONICS TECH GROUP CORP
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