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Three-dimensional flow field image measurement device and method adopting single lens

A three-dimensional flow field and image measurement technology, which is used in measurement devices, testing of machine/structural components, fluid dynamics tests, etc. The effect of simplifying the measurement system and data processing process and reducing the cost of the system

Inactive Publication Date: 2012-11-28
UNIV OF SHANGHAI FOR SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is a synchronization problem between two or more sets of shooting systems, the adjustment is very difficult, and the data processing is complicated; and in order to shoot clear particle transient images or interference images, the exposure time is usually required to be extremely short, and high-speed cameras and High-energy pulsed laser light source, etc., the system cost is high

Method used

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  • Three-dimensional flow field image measurement device and method adopting single lens
  • Three-dimensional flow field image measurement device and method adopting single lens
  • Three-dimensional flow field image measurement device and method adopting single lens

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specific Embodiment approach

[0030] Embodiment 1 of a three-dimensional flow field image measurement device using a single lens, such as figure 1 As shown, it is characterized in that the device is composed of a polarized light source 1, a lens 2, a dichroic prism 3, a first polarizer 4, a second polarizer 5, a first image sensor 6, a second image sensor 7 and a computer 8, the described The polarized light source 1 is placed on the flow field to be measured to illuminate the flow field through the window, the beam splitting prism 3 is placed behind the lens 2, the incident surface A of the beam splitting prism 3 is opposite to the lens 2, and the first exit surface B of the beam splitting prism 3 The second image sensor 6 and the first image sensor 7 which are arranged at the same optical distance from one side of the second exit surface C respectively, and the first polarizer 4 and the second polarizer 5 are arranged on the second side of the dichroic prism 3 respectively. The middle between the exit s...

Embodiment 2

[0046] For example, the first polarizer 4 and the second polarizer 5 in embodiment 1 are coated on the two surfaces of the second exit surface C and the first exit surface B of the dichroic prism by coating, as figure 2 As shown, the dichroic prism 3 , the first polarizer 4 and the second polarizer 5 in the first embodiment are integrated, and the measurement steps are the same as those in the first embodiment.

Embodiment 3

[0048] Such as image 3 As shown, the dichroic prism 3, the first polarizer 4 and the second polarizer 5 in the embodiment 1 can also be replaced by the polarization beam splitter prism 9, and the first image sensor 6 and the second image sensor 7 are then at an equal optical path distance They are respectively placed on the sides of the two outgoing surfaces of the polarizing beam splitter prism 9, and the measurement steps are the same as those in Embodiment 1.

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Abstract

The invention discloses a three-dimensional flow field image measurement device and method adopting a single lens, which are characterized in that a polarized light source is used for illuminating a flow field to be detected; light from a camera lens is divided into two paths through a light splitting prism and polaroids are respectively used for carrying out polarization detection for the two paths; two CCDs (Charge Coupled Device) or CMOS (Complementary Metal-Oxide-Semiconductor Transistor) image sensors are respectively used for imaging; a relative gray level of a corresponding tracer particle in two pictures can be used for judging whether the tracer particle is located in front of a focusing plane or in back of the focusing plane; the distance between the position of the tracer particle and the focusing plane is computed according to the size of a defocusing amount of the tracer particle of the single picture, so as to only determine a three-dimensional position of the tracer particle; and a movement fuzzy parameter is combined to further obtain a three-dimensional movement speed of the tracer particle, namely the information of a three-dimensional flow field is obtained. The three-dimensional flow field image measurement device and method adopting the single lens have the beneficial effects that the three-dimensional measurement of a transient flow field can be realized by only one camera lens, a measurement system and a data processing process are simplified, and the system cost is reduced.

Description

technical field [0001] The invention relates to an image measurement device and method for a three-dimensional flow field, in particular to a device and method for acquiring three-dimensional flow field information based on fuzzy image processing and using a single lens. Background technique [0002] In recent years, with the development of digital cameras and computer technology, flow field measuring instruments that use digital cameras to capture trace particles to obtain flow field information have been widely used. For the acquisition of three-dimensional flow field information, two or more sets of shooting systems are usually used to perform imaging from two or more perspectives. There are synchronization problems between two or more sets of shooting systems, the adjustment is very difficult, and the data processing is complicated; and in order to shoot clear particle transient images or interference images, the exposure time is usually required to be extremely short, a...

Claims

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Application Information

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IPC IPC(8): G01M10/00
Inventor 蔡小舒周骛
Owner UNIV OF SHANGHAI FOR SCI & TECH
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