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Rainbow schlieren measurement imaging system and method

An imaging system and rainbow pattern technology, which is used in measurement devices, testing of machine/structural components, instruments, etc., can solve the problems of poor image contrast, difficulty in eliminating optical path errors, and difficulty in quantitatively measuring airflow, and improve the signal-to-noise ratio. , the effect of high signal-to-noise ratio

Active Publication Date: 2016-11-30
INST OF MECHANICS - CHINESE ACAD OF SCI
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Problems solved by technology

The disadvantage is that it is difficult to eliminate the optical path error, the image contrast is poor, and it is difficult to quantitatively measure the airflow

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Embodiment Construction

[0037] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined arbitrarily with each other.

[0038] The present invention combines compressed sensing theory with rainbow schlieren measurement, and creatively proposes a sparse rainbow schlieren measurement method, which has the characteristics of high throughput, high signal-to-noise ratio, fast and flexible, and is suitable for conventional light intensity, weak light, and weak light , ultra-weak light and single-photon rainbow schlieren measurement method, which is a sparse rainbow schlieren measurement method with a large dynamic range. The rainbow schlieren measurement and imaging system and method based on compressed sensing of the present invention adopts the principle of compressed sensing (Compressive Sensing, re...

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Abstract

A rainbow schlieren measurement imaging system and method, the system includes a light source for outputting optical signals; and a first focusing lens, a slit stop, a first collimating lens, Flow field observation area, second focusing lens, rainbow filter, second collimating lens, digital microarray mirror, converging lens and three-color single-point photodetector; compression connected with electrical signal of three-color single-point photodetector The algorithm module is used for reconstructing the color image, and calculates the density change distribution of the observed flow field according to the rainbow schlieren calculation method of the image. The present invention combines compressed sensing theory with rainbow schlieren measurement, and creatively proposes a sparse rainbow schlieren measurement method, which has the characteristics of high throughput, high signal-to-noise ratio, fast and flexible, and is suitable for conventional light intensity, weak light, and weak light , ultra-weak light and single-photon rainbow schlieren measurement method, which is a sparse rainbow schlieren measurement method with a large dynamic range.

Description

technical field [0001] The invention relates to the field of rainbow schlieren measurement and imaging, in particular to a system and method for rainbow schlieren measurement and imaging based on compressed sensing. Background technique [0002] Since Topler first used the schlieren measurement technique to quantitatively measure the flow field, the schlieren has gradually become a routine measurement instrument in wind tunnel tests. Fluids are measured using schlieren, which offers high sensitivity and image resolution compared to shadow measurement techniques. The disadvantage is that it is difficult to eliminate the optical path error, the image contrast is poor, and it is difficult to quantitatively measure the airflow. However, color schlieren imaging systems and analysis methods are being developed as a measurement technique for schlieren deficiency. In 1952, British Holder, D.W. and North, R.J. first invented the color schlieren measurement method. Compared with the...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M9/06G01M10/00
Inventor 戴国亮孙志斌代斌王静
Owner INST OF MECHANICS - CHINESE ACAD OF SCI
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