Polarization beam splitting device for sequential laser laser shadow photography

Abstract

The invention belongs to the field of ultra-high-speed transient imaging, and relates to a polarization beam splitting device for sequential laser shadow photography, including a polarizing device and a polarization beam splitting device. The components of the device include a polarizer, a polarizing sleeve, a first optical protection glass, a second optical protection glass and a protection sleeve. The present invention utilizes the principle that polarizers can only transmit light that is consistent with the polarization direction. In the multi-sequence laser shadow photography system, the polarization characteristics of different sequences of laser beams that come out of the multi-sequence laser shadow photography system through the multi-light source space separation device have disappeared, and come out through the multi-light source space separation device. A polarizer is placed at the position of the focal spot of the beam, and the polarization direction of the beam passing through the polarizer is consistent with the polarization direction of the polarizer, and the polarization directions of the polarizers placed by different sequences of beams are sequentially different by 90°.

Description

technical field [0001] The invention belongs to the field of ultra-high-speed transient imaging, and relates to a polarization beam splitting device for sequential laser shadow photography. Background technique [0002] With the development of my country's aerospace technology, weapons and equipment, and basic disciplines, research in the fields of ultra-high-speed aerodynamics, ultra-high-speed collisions, explosions and impacts, combustion and chemical reactions has continued to deepen. In these research works, many phenomena are ultra-high-speed transient change processes with a duration of only microseconds or even nanoseconds. It is necessary to have a camera system that can clearly and continuously image and record this process in order to grasp the physical phenomena. Nature. In addition to requiring the amplitude and frequency to reach 10 million frames per second (that is, the shortest exposure and imaging time is 100ns), this camera system can perform sequential i...

AI Technical Summary

Problems solved by technology

When the multi-sequence laser shadow photography system is imaging the test area, the information of the area that does not completely overlap will be lost when it is imaged in different sequences. Therefore, the smaller the overlap of the test area, the more the test information will be lost, which is not conducive to multi-sequence imaging

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