A laser-induced fluorescence focusing schlieren system

Abstract

The embodiment of the invention discloses a laser-induced fluorescence focusing schlieren system. The system comprises a laser induced fluorescence module and a focusing schlieren module, wherein thelaser induced fluorescence module is used for freezing a high-speed flow field and generating fluorescence for eliminating coherent noise; the focusing schlieren module is used for shooting and storing instantaneous two-dimensional flow field information of a specific focal plane in the high-speed flow field serving as a test area; and the fluorescent light is used as a light source of the focusing schlieren module. According to the invention, the laser induces the specific substance to generate fluorescence for eliminating coherent noise to serve as the light source of the focusing schlierenmodule, the focusing schlieren module is used for shooting and storing instantaneous two-dimensional information of the specific focal plane in the flow field, the high-speed high-temperature high-pressure flow field structure can be frozen while the coherent noise of the light source is eliminated, and the specific focal plane is recorded.

Description

technical field [0001] Embodiments of the present invention relate to the field of measurement technology, and in particular to a laser-induced fluorescence focusing schlieren system. Background technique [0002] The hypersonic combustion flow field structure is closely related to the flame combustion mode and fluid dynamics. In the research of hypersonic combustion field, the high temperature brought by combustion has brought great difficulties to contact visualization technology. In the non-contact optical measurement technology, there are problems such as high temperature makes the glass of the optical window deform and change the refractive index, the flow velocity is too fast to cause blurring, and the three-dimensional effect of the flow field is serious, which increases the difficulty of visualizing the hypersonic combustion flow field. Although the focus schlieren technique can solve the above difficulties, the coherent noise of the light source will affect the ima...

AI Technical Summary

Problems solved by technology

In the study of hypersonic combustion field, the high temperature brought by combustion has brought great difficulties to contact visualization technology

In the non-contact optical measurement technology, there are problems such as high temperature makes the glass of the optical window deform and change the refractive index, the flow velocity is too fast to cause blurring, and the three-dimensional effect of the flow field is serious, which increases the difficulty of visualizing the hypersonic combustion flow field.

Although focusing schlieren technology can solve the above difficulties, the coherent noise of the light source will affect the image quality

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