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 |
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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.
Principle of the image rotating mechanism based on Pechan prism
Optical schematic of the high speed rotating mirror streak camera equipped with the Pechan prism. ① Object; Main ② objective lens; Slit ③; Second objective lens ④; Rotating mirror ⑤; Image plane ⑥ Image plane; ⑦ Pechan prism
Optical schematic of the high speed rotating mirror framing camera equipped with the Pechan prism. ① Object; Main ② objective lens; Eyesight diaphragm; Second objective lens; Aperture diaphragm; Rotating mirror; Framing di ③ Eyesight diaphragm; ④ Second objective lens; ⑤ Aperture diaphragm; ⑥ Rotating mirror; ⑦ Framing diaphragm; ⑧ Framing lens; ⑨ Camera image plane; ⑩ Pechan prism
Structure design and profile of the image rotating mechanism of prism. Prism shell cover; ① Prism shell cover; ② Loop spacer; ③ Prism shell; ④ Image rotating shell; ⑤ Lock-screw; ⑥ Spacer; ⑦ Prism pedestal; ⑧ Pechan prism; ⑨ Screw; ⑩ Screw; ⑪ Connection pedestal
Dynamic resolution image of framing camera. (a) Without Pechan prism; (b) With Pechan prism
Dynamic resolution image of streak camera. (a) Without Pechan prism; (b) With Pechan prism
Schematic of the experiment device
Layout of the photography experiment
Ahead phenomenon of jet between gap recorded by streak camera with the image rotating mechanism
Picture recorded by framing camera