Light field imaging-based chromatographic PIV measuring device and method

A light field imaging and measurement device technology, which is applied in the direction of measurement devices, fluid velocity measurement, velocity/acceleration/impact measurement, etc., can solve the problems of increasing the cost, complexity and reconstruction calculation amount of tomographic PIV technology, and achieve convenient calibration , Reduce system error and compact system

Active Publication Date: 2017-06-30
SOUTHEAST UNIV
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Problems solved by technology

However, the tomographic PIV technology often requires 3 to 6 cameras to capture the flow field, which

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  • Light field imaging-based chromatographic PIV measuring device and method
  • Light field imaging-based chromatographic PIV measuring device and method
  • Light field imaging-based chromatographic PIV measuring device and method

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Embodiment Construction

[0045] The present invention will be further illustrated below in conjunction with specific embodiments, and it should be understood that the following specific embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention.

[0046] The working principle of the tomographic PIV device based on light field imaging of the present invention is as follows: since the flow field itself does not emit light, tracer particles with good followability and scattering properties are added to the flow field to be measured, and the laser beam with a certain thickness Incident into the flow field, the tracer particles produce scattered light. Set the light field camera in the double-frame working mode, and use the timing synchronization controller to adjust the time interval of the double pulse signal of the laser, so that the two laser pulses fall on the double exposure time of the light field camera respectively, so that the lig...

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Abstract

The present invention provides a light field imaging-based chromatographic PIV measuring device and a method. The device includes a light source apparatus for generating double-pulse laser light and illuminating a three-dimensional flow field and an imaging apparatus for photographing the three-dimensional flow field; the light emitting end of the light source apparatus is provided with a lens group; the light source apparatus and the imaging apparatus are connected with a time sequence synchronous controller; the imaging apparatus is connected with a computer; the lens group is used for developing the double-pulse laser generated by the light source apparatus into a body light source of a certain thickness and a two-dimensional sheet light source of 1 mm and illuminating the flow field; and the image forming apparatus comprises a main lens, a CCD detector and a microlens array positioned between the main lens and the CCD detector. With the device and the method of the invention adopted, a weight matrix can be can quickly calculated, the calibration of the internal and external parameters of a light field camera is not required, and system error caused by multi-camera synchronous coupling can be reduced. The device is simple.

Description

Technical field: [0001] The invention relates to a tomographic PIV measurement device and method based on light field imaging, belonging to the technical field of fluid measurement and visualization. Background technique: [0002] Flow velocity is one of the important parameters to describe the characteristics of flow field. Both the scientific research field and the industrial field involve the measurement of the flow field velocity. For example, the control of the fuel transmission speed in the combustion process of the boiler is of great significance to the combustion efficiency, safe and stable combustion; the heat transfer efficiency of microfluid is related to the flow field velocity, etc. . It is one of the hotspots in experimental fluid mechanics to realize non-contact, transient and three-dimensional full-field flow velocity measurement. [0003] With the rapid development of computer technology, sensor technology, and photoelectric technology, PIV technology has ...

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Application Information

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IPC IPC(8): G01P5/26
CPCG01P5/26
Inventor 许传龙曹丽霞张彪宋祥磊
Owner SOUTHEAST UNIV
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