Two-dimensional flow velocity field measurement method and device of interlaced scanning CCD (charge coupled device)

A technology of interlaced scanning and measurement method, applied in the direction of fluid velocity measurement, measurement device, velocity/acceleration/shock measurement, etc., which can solve the problems of high price, complicated equipment, and limited application and development of PIV measuring instruments.

Active Publication Date: 2013-09-11
SOUTHEAST UNIV
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Problems solved by technology

[0003] However, the current commercialized PIV instruments are complex and expensive
The price of commercial PIV instruments in the international market is as high as 200,000-300,000 US dollars, which greatly limits the application and development of PIV measuring instruments

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  • Two-dimensional flow velocity field measurement method and device of interlaced scanning CCD (charge coupled device)
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  • Two-dimensional flow velocity field measurement method and device of interlaced scanning CCD (charge coupled device)

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Embodiment Construction

[0039] The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. After reading the present invention, those skilled in the art all fall into the appended claims of the present application to the amendments of various equivalent forms of the present invention limited range.

[0040]The working principle of the present invention: plant tracer particles in the fluid to be tested, and the tracer particles are irradiated by the laser sheet light source. Under the control of the computing software, the interlaced scanning CCD3 collects and obtains the flow field image by the image acquisition card, and stores it in the computer 4 Inside; in the computer 4, the data processing software first filters and binarizes the acquired image, and separates one frame ...

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Abstract

The invention discloses a two-dimensional flow velocity field measurement method and device of an interlaced scanning CCD (charge coupled device). Trace particles are implanted into a to-be-measured flowing object (gas or liquid) and can move together with fluid due to viscidity. For the measurement device, a continuously light-emitting gas laser (such as He-Ne laser) is used as a light source, and a common interlaced scanning CCD sensor is used as an image detector. A one-frame flowing image including the trace particles is captured transiently, then the flowing image is processed by means of filtering and binaryzation, the interlacedly scanned one-frame image is separated into two images according to odd-even lines, a cross-correlation technology is adopted to perform computation processing, and accordingly a two-dimensional flow velocity field can be obtained. PIV (particle image velocimetry) full-field velocity measurement can be achieved without a high-power laser, a high-resolution CCD and a complex synchronizer; and the two-dimensional flow velocity field measurement method and device is simple in equipment, low in cost and applicable to flow field measurement on different occasions.

Description

technical field [0001] The invention belongs to the technical field of flow field measurement, and in particular relates to the measurement technology of a two-dimensional instantaneous flow velocity field of an interlaced scanning CCD sensor. Background technique [0002] For the measurement of the two-dimensional plane velocity field, there are mainly Particle Tracer Velocimetry (PTV for short) and Particle Image Velocimetry (PIV for short). PTV / PIV is a very important instrument developed in the 1980s to study fluid mechanics. It spreads tracer particles with good followability and light reflection in the flow field, and irradiates the measured flow field with a sheet laser. Using the imaging recording system to continuously acquire the particle images of two or more exposures, and then using the image cross-correlation method to obtain the average displacement of the particle images in each small area, the velocity distribution of the whole field can be obtained. PIV te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01P5/22
Inventor 许传龙宋飞虎李健王胜南
Owner SOUTHEAST UNIV
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