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Interference Rayleigh scattering speed measurement device used for flow fields

A technology of Rayleigh scattering and speed measuring device, which is applied in the direction of measuring device, fluid speed measurement, speed/acceleration/shock measurement, etc. It can solve the problems of laser output wavelength jitter, weak signal, vibration influence, etc., to improve anti-vibration performance and Effects of environmental adaptability, improvement of signal strength, and improvement of measurement accuracy

Inactive Publication Date: 2014-02-05
NORTHWEST INST OF NUCLEAR TECH
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Problems solved by technology

[0007] The technical problem to be solved in the present invention is to develop a speed measuring device based on the interference method to detect the Doppler frequency shift of scattered light on the basis of Rayleigh scattering technology, so as to solve the problems of weak signal, vibration influence, laser output wavelength jitter, etc. in engineering applications. question

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  • Interference Rayleigh scattering speed measurement device used for flow fields
  • Interference Rayleigh scattering speed measurement device used for flow fields
  • Interference Rayleigh scattering speed measurement device used for flow fields

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Embodiment Construction

[0033] figure 1 The system composition diagram of the speed measuring device. The speed measurement system consists of a laser 1, a flow field interaction unit 2, a scattered light collection unit 3, a detection unit 4 and a reference unit 5.

[0034] The laser 1 adopts a narrow linewidth continuous or pulsed laser, and a tunable Nd:YAG laser with seed injection locking can be used, and the double frequency 532nm laser is used as the incident light.

[0035] The flow field interaction unit 2 includes a half-wave plate 6 and a focusing lens 7. After the laser is adjusted by the half-wave plate 6 in its polarization direction, it is focused by the focusing lens 7 to the vicinity of the detection point 9. The closer the detection point 9 is to the focus, the stronger the signal obtained , The outgoing laser is finally absorbed by the absorption trap 8.

[0036] The scattered light collection unit 3 is a lens group with a certain oblique angle to the laser incident direction. The scatte...

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Abstract

The invention discloses an interference Rayleigh scattering speed measurement device used for flow fields. The interference Rayleigh scattering speed measurement device comprises a laser, a flow-field interaction unit, a scattered light collection unit, a reference unit and a detection unit; the flow-field interaction unit comprises a half-wave plate and a focusing lens which are sequentially arranged along an outgoing light path of the laser, a detection point is arranged on the outgoing light path of the laser and close to the focal point of the focusing lens, the flow fields to be measured flow through the detection point, and the flow-field direction and the laser outgoing direction are arranged in an inclined mode; the scattered light collection unit is a lens set which is arranged in an inclined mode as for the flow-field direction; the reference unit comprises an incoming beam splitter, a reflector and an outgoing beam splitter, and the detection unit comprises a Fabry-Perot etalon and an ICCD camera which are arranged along a scattered light path. According to the interference Rayleigh scattering speed measurement device, by simultaneously measuring relative frequency shift between static reference light interference rings and flow-field scattered light interference spots, real-time frequency shift signals are obtained, influence on frequency shift detection from output wave length jitter of the laser is eliminated, and the interference Rayleigh scattering speed measurement device is suitable for the majority of diagnosis flow fields comprising a combustion flow field.

Description

Technical field [0001] The invention relates to a flow field velocity measurement device, in particular to an optical measurement device suitable for high-speed flow field velocity measurement such as engines and wind tunnels. Background technique [0002] Using laser-based non-contact optical diagnosis technology to diagnose the combustion flow field of various engines such as aero-engines and internal combustion engines, obtain various parameter information of the flow field, verify the optimization design of the engine and the verification of the simulation model, and improve the combustion efficiency and engine performance. Pollutant emission control has very important scientific significance and practical value. [0003] In the diagnosis parameters of the combustion flow field of the engine, temperature and speed are the two most basic parameters. Through the measurement of the static temperature and speed of the flow field, the total temperature of the flow field can be calcu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01P5/26
Inventor 邵珺胡志云叶景峰张振荣李国华黄梅生
Owner NORTHWEST INST OF NUCLEAR TECH
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