Laser Doppler speed measurement and calibration device based on dynamic radius measurement

A technology of Doppler velocimeter and dynamic radius, which is applied in the direction of measurement device, speed/acceleration/shock measurement equipment testing/calibration, speed/acceleration/shock measurement, etc. It can solve the problem that the traceability of wind speed calibration cannot be realized, etc. To achieve the effect of increasing the level of uncertainty

Inactive Publication Date: 2017-08-22
BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA
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Problems solved by technology

[0004] The purpose of the present invention is to solve the traceability problem that common wind speed calibration methods cannot realize wind speed calibration, and propose a laser Doppler speed measurement calibration device based on dynamic radius measurement

Method used

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  • Laser Doppler speed measurement and calibration device based on dynamic radius measurement
  • Laser Doppler speed measurement and calibration device based on dynamic radius measurement
  • Laser Doppler speed measurement and calibration device based on dynamic radius measurement

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Embodiment Construction

[0019] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0020] like figure 1 and image 3 As shown, a laser Doppler velocimetry calibration device based on dynamic radius measurement includes a first drive motor 1, a first measurement grating 2, an air bearing shaft system 3, a standard turntable 4, an air bearing guide rail 5, and a second measurement grating 6. Laser Doppler velocimeter 7, second driving motor 8, base 9, bolt 10, through hole 11, gold-plated tungsten wire 12 and computer.

[0021] like figure 2 As shown, the standard turntable 4 is made of aluminum alloy, with a diameter of 200-250mm, and the upper and lower ends are thin discs with a thickness of 5-10mm. The maximum speed reaches 4000r / min, and the maximum calibratable speed is 40m / s; The cylindrical portion has a through hole 11 along the radial direction of the standard turntable. The diameter of the through hole is determined ac...

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Abstract

The invention particularly relates to a laser Doppler speed measurement and calibration device based on dynamic radius measurement, and belongs to the field of wind speed measurement and calibration. The device comprises a driving motor, an air floating shaft system, an air floating guide rail, a laser Doppler speed measurement device, a standard rotary disc, a measurement optical grating, a substrate and a computer. According to the invention, by taking the dynamic radius measurement of a standard rotary disc under different rotation speeds as the core technology, the dynamic radius of the standard rotary disc is obtained by use of a laser Doppler speed measurement mode; standard linear speed generated by the standard rotary disc is acquired and compared with the speed measured by the laser Doppler speed measurement device, so calibration of the laser Doppler speed measurement device is finished; traceability of flow speed parameters can be achieved; the device is superior to a traditional speed measurement and calibration method; and meanwhile, by use of the high precision driving motor, and using the grinding technology to manufacture the precise air floating shaft system and the air floating guide rail, the uncertainty level of the calibration device is increased.

Description

technical field [0001] The invention specifically relates to a laser Doppler velocity measurement calibration device based on dynamic radius measurement, and belongs to the field of wind velocity measurement and calibration. Background technique [0002] Usually, the anemometer calibration is carried out in a normal temperature wind tunnel, and its reference standard is mostly a standard Pitot tube. Pitot tube velocity measurement has greater uncertainty at lower speeds, and is affected by fluid compressibility at higher flow rates, which cannot meet the needs of current velocity measurement. At present, the common practice at home and abroad is to use a set of Pitot tubes as a reference standard for regular mutual comparison, but this method cannot achieve traceability. [0003] The principle of laser Doppler speed measurement technology adopted in the present invention uses laser to collect the velocity of tracer particles in the fluid area, which greatly overcomes the sh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01P21/02
CPCG01P21/02
Inventor 李亚晋王毅武建红李海燕常蕾
Owner BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA
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