Laser velocity measurement system and method based on non-injection laser and etalon
A laser speed measurement, non-injection technology, applied in the field of meteorology, can solve problems such as system complexity, achieve cost reduction, accurate and reliable speed measurement, and reduce complexity
Active Publication Date: 2017-12-05
郑州漫光科技有限公司
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Problems solved by technology
In terms of cost, the cost of seed injection lasers is often several times or even dozens of times that of non-injection lasers due to the complexity of the system
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[0030] Below in conjunction with accompanying drawing and specific embodiment the technical solution of the present invention is described in further detail:
[0031] In this embodiment, a laser velocimetry system based on non-injection lasers and Etalon, such as figure 1 As shown, it includes a non-injection pulsed laser as a system emitting light source, a beam expander, a polarizer, a half-wave plate, Etalon, a quarter-wave plate, a collimating mirror, a transmitting and receiving mirror, and the first to third total reflection mirrors , first to third polarization beam splitters PBS, beam splitter, first and second converging lenses, first and second photomultiplier tubes PMT and microprocessor. In this embodiment, according to the direction of the optical path, it can be divided into two parts: the emission system and the reflection system, wherein the emission system sequentially includes a non-injection pulsed laser, a beam expander, a first total reflection mirror M1, ...
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The invention discloses a system and method for laser speed measurement based on a non-injection laser and an Etalon. Based on light-transmission spectral features of the Etalon, wideband non-injection laser pulses are made to pass the Etalon; a series of narrow-band laser independent at frequencies is generated; and the narrow-band laser is sent out by an optical transmitting system. The laser speed measurement system receives back-scattering echoes of a to-be-tested object; after collimation, a polarization optical system is used to make back-scattering light enter the Etalon again at a certain incidence angle. Photomultipliers are disposed on the front face and the rear face of the Etalon respectively, wherein the photomultipliers are called as a reference channel and a signal channel respectively; a ratio between the two channels is in direct proportion to a speed of the to-be-tested object; and the motion speed of the to-be-tested object can be acquired based on an actually measured ratio between the two channels in combination with a calibration result of the speed measurement system. In comparison with existing systems, the system disclosed by the invention has the advantages of low cost and stable work, etc.
Description
technical field [0001] The invention relates to a laser speed measurement system and method based on non-injection lasers and Etalon, belonging to the field of meteorological technology. Background technique [0002] Due to its unique advantages, Doppler wind lidar has received more and more attention and applications. At present, the Doppler wind lidar technology can be divided into direct detection technology and coherent detection technology from the Doppler frequency shift detection method. Direct detection technology uses high-resolution spectroscopic equipment, such as atomic molecular absorption cell, Fabry-Perot interferometer, and uses the steep spectral curve of high-resolution spectroscopic equipment to convert the change of laser frequency into the change of passing light intensity. Coherent detection technology uses the principle of optical mixing to mix the backscattered optical signal containing Doppler frequency shift with the local optical signal to obtain ...
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IPC IPC(8): G01S7/481G01S17/58G01S17/95G01P5/26
CPCG01P5/26G01S7/481G01S7/4811G01S17/58G01S17/95Y02A90/10
Inventor 单坤玲萨日娜卜令兵王楠张衡衡
Owner 郑州漫光科技有限公司