Speed measurement method and system based on double etalons

An etalon and speed measurement technology, which is applied in the direction of radio wave measurement system, test/calibration of speed/acceleration/shock measurement equipment, measurement device, etc., can solve the problems that the pulse frequency jitter cannot be corrected, the cost is expensive, and the system is huge , to achieve the effects of reducing pulse frequency jitter, easy measurement, and cost reduction

Inactive Publication Date: 2016-09-28
NANJING UNIV OF INFORMATION SCI & TECH
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Problems solved by technology

Unfortunately, in lidar applications, since the system uses the average lidar signal, the pulse frequency

Method used

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  • Speed measurement method and system based on double etalons
  • Speed measurement method and system based on double etalons

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Embodiment Construction

[0020] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0021] Such as figure 1 As shown, the dual etalon-based speed measuring system of the present invention includes a laser emitting system, a laser receiving system and a photoelectric detection system. The laser emitting system includes a laser 1 , a beam expander 2 , a mirror M1 , and an emitting etalon 3 . The laser receiving system includes a receiving lens 4, a collimating mirror 5, a beam splitting mirror 6, a reflecting mirror M2, a receiving etalon 7, a converging mirror b8, and a converging mirror a9. The photoelectric detection system includes a photomultiplier tube a 11 , a photomultiplier tube b 10 , a high-speed AD acquisition card 12 and a computer 13 . The laser 1 emits the laser beam and expands the laser beam through the beam expander 2. The laser beam is incident on the emitting etalon 3 through the mirror M1, and then the laser is calibrated and sh...

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Abstract

The invention discloses a speed measurement method and system based on double etalons. The method comprises the steps: carrying out the inversion of the speed of a to-be-measured target object through measuring the Doppler frequency shift of an echo signal, returned by the to-be-measured target object, of a laser beam; enabling the laser beam to form a plurality of narrow band laser beams with the split frequencies through a receiving etalon, and irradiating the to-be-measured target object; enabling the echo signal to be divided into two ways, wherein one way passes through the receiving etalon and a Doppler frequency shift detection signal is obtained, and the other way serves as a reference light signal; and obtaining the speed of the to-be-measured target object through the comparison of the Doppler frequency shift detection signal and the reference light signal. The system is simple in structure, and exerts low requirements on the laser line width and the frequency stability.

Description

technical field [0001] The invention relates to a method and system for measuring Doppler frequency shift by using double etalons. Background technique [0002] Doppler wind lidar uses the Doppler effect of light to measure the Doppler frequency shift of the echo signal transmitted by the laser beam in the atmosphere to retrieve the spatial wind speed distribution. There are two detection methods of Doppler wind lidar: coherent (heterodyne) detection and incoherent (direct) detection. Heterodyne detection uses the beat frequency signal of local oscillator light and signal light to measure the Doppler frequency shift of the laser. The measurement accuracy is relatively high, but the requirements for laser linewidth, frequency stability and optical alignment are quite strict. The direct detection method is mainly based on the edge technology laser Doppler frequency shift measurement method of the Fabry-Perot (F-P) interferometer, which converts the measurement of the light wa...

Claims

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Application Information

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IPC IPC(8): G01S7/497G01S17/58G01P5/26G01P21/02
CPCG01S7/497G01P5/26G01P21/025G01S17/58
Inventor 卜令兵张晋茹黄兴友郜海阳
Owner NANJING UNIV OF INFORMATION SCI & TECH
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