Rainbow schlieren measurement imaging system and method

Abstract

The invention discloses a rainbow schlieren measurement imaging system and method. The rainbow schlieren measurement imaging system comprises a light source, a first focusing lens, a slit diaphragm, a first collimating lens, a flow field observation area, a second focusing lens, a rainbow filtering piece, a second collimating lens, a digital micro array lens, a converge lens, a three-color single-point photoelectric detector and a compression algorithm module, wherein the first focusing lens, the slit diaphragm, the first collimating lens, the flow field observation area, the second focusing lens, the rainbow filtering piece, the second collimating lens, the digital micro array lens, the converge lens and the three-color single-point photoelectric detector are sequentially arranged along a light signal output route of the light source, and the compression algorithm module is connected with the three-color single-point photoelectric detector through electric signals and used for reconstructing colorful images and working out density fluctuation distribution of an observation flow field according to a rainbow schlieren calculation method of the images. The rainbow schlieren measurement imaging method combines the compressed sensing theory and rainbow schlieren measurement, creatively provides a sparse rainbow schlieren measurement method, has the advantages of being high in throughput and signal-to-noise ratio, rapid and flexible, is suitable for common light intensity, dim light, faint light, super-faint light and single-photon rainbow schlieren measurement methods, and is a large-dynamic-range sparse rainbow schlieren measurement method.

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...

AI Technical Summary

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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