Application of image rotating mechanism of prism in ultra-high speed rotating mirror camera

Chang Lihua; Li Jian; Wang Wei; Wang Xu; Zhang Guangsheng; Gao Peng; Xiao Zhengfei; Shang Changshui

doi:10.12086/oee.2019.180399

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Chang Lihua, Li Jian, Wang Wei, et al. Application of image rotating mechanism of prism in ultra-high speed rotating mirror camera[J]. Opto-Electronic Engineering, 2019, 46(1): 180399. doi: 10.12086/oee.2019.180399

Citation:

Chang Lihua, Li Jian, Wang Wei, et al. Application of image rotating mechanism of prism in ultra-high speed rotating mirror camera[J]. Opto-Electronic Engineering, 2019, 46(1): 180399. doi: 10.12086/oee.2019.180399

Application of image rotating mechanism of prism in ultra-high speed rotating mirror camera

Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang, Sichuan 621900, China

Fund Project: Supported by National Science, Technology and Industry for National Defense Foundation of China (JSJL2016208A011) and National Significant Scientific Instruments Development Project of China (2011YQ130019)

More Information

Corresponding author: Wang Wei, E-mail:wwclhdd@163.com

Received Date 25 July 2018

Revised Date 18 October 2018

Published Date 01 January 2019

Abstract

Abstract

In this paper the principle of image rotating mechanism based on prism is introduced and the image rotating mechanism using Pechan prism matching the high speed rotating mirror camera is designed. The designed mechanism can be used in FJZ-250 or SJZ-15 type rotating mirror camera as a fixed part. Equipped with the designed mechanism, the rotating mirror cameras can rotate the image of the object by any angle in the range of 0°~360° before recording it. As a result, the measurement problem of different research directions of detonation test is solved when multiple cameras are used synchronously, which plays an important role in acquisition of experimental data and debugging of outdoors targets, thus, it is a great convenience for the camera. The results of the image quality specification experiment indicate that the equipment of the designed image rotating mechanism based on Pechan prism induced no degradation to the image quality and even slightly improved it.
- high speed photography /
- rotating mirror camera /
- image rotating mechanism /
- explosion

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References

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Overview

Overview

Overview: The rotating mirror high-speed framing camera and streak camera have the characteristics of high spatial resolution, large picture size, long recording time, high photographic frequency and so on. They have always been an important means of experimental research in nuclear weapons, conventional weapons, high-tech weapons and other fields. They are widely used in the measurement of explosive detonation parameters, shock wave velocity, expansion fracture of nuclear weapons and conventional weapons warheads, micro material ejection, and the speed of flyer and fragmentation. Moreover, they are also widely used in ballistics, lightning and high-pressure spark discharge, material decomposition and synthesis, transient spectral analysis, high-speed collision and safety protection. With the development of precision physics experiment, in addition to studying the waveform symmetry on a plane of the target, it is often necessary to capture the waveform symmetry of different directions, for example, it is required to measure the waveform of two special directions with an angle of θ. The image rotating mechanism using Pechan prism matching the high speed rotating mirror camera was designed. It is compact, simple and convenient to operate, and it can be used in FJZ-250 or SJZ-15 type rotating mirror camera as a fixed part. Equipped with the designed mechanism, the rotating mirror cameras can rotate the image of the object by any angle in the range of 0°~360° before recording it. As a result, the measurement problem of different research directions of detonation test is solved when multiple cameras are used synchronously, which plays an important role in acquisition of experimental data and debugging of outdoors targets, thus, it is a great convenience for the camera. Static visual resolution and dynamic photographic resolution were measured for the rotating mirror framing and streak cameras. The results of the image quality indicate that the equipment of the designed image rotating mechanism based on Pechan prism induced no degradation but even slight improved the image quality. The effects of explosive crack and gap on detonation propagation were studied by means of the rotating mirror framing and streak camera. One-dimensional ultra-high time resolution image of explosive detonation wave and the advance of the jet in the gap were captured by rotating mirror streak camera with image rotating mechanism of prism. The crack jet was clearly observed ahead of the explosion wave with about 1.31 µs. Two-dimensional high spatial resolution image of the explosive propagation process was captured by the rotating framing camera, and the effect of gap jet on blast wave was clearly observed at different times. The expected results were obtained.