Modified Cranz-Shardin camera for both isochromatic and caustic patterns

Xian-Ji Su; Q. K. Zhu; Bingsang Fu; Z. Li; Jing Fang

doi:10.1117/12.161356

11 October 1993 Modified Cranz-Shardin camera for both isochromatic and caustic patterns

Xian-Ji Su, Q. K. Zhu, Bingsang Fu, Z. Li, Jing Fang

Proceedings Volume 2002, Ultrahigh- and High-Speed Photography, Videography, and Photonics '93; (1993) https://doi.org/10.1117/12.161356
Event: SPIE's 1993 International Symposium on Optics, Imaging, and Instrumentation, 1993, San Diego, CA, United States

Abstract

A modified Cranz-Schardin camera is presented that records simultaneously both the isochromatic patterns of dynamic photoelasticity and the shadow patterns of dynamic caustics, which are useful for the investigation of the interaction between the stress waves and the cracks in elastic structures. The system of spark gaps each of them consisting of four electrodes provides point flashes that are small enough in size to form the caustic patterns of good quality and intense enough in light for the recording of the isochromatic patterns of photoelasticity. A chip-microprocessor and some other hardware elements are used in the control system for the time setting of the first delay and variated frame intervals. With the help of a partial reflecting mirror the caustic pattern and the isochromatic patterns are recorded simultaneously with separated films. Some results of the recorded patterns are given to show the validity of this system.

Citation Download Citation

Xian-Ji Su, Q. K. Zhu, Bingsang Fu, Z. Li, and Jing Fang "Modified Cranz-Shardin camera for both isochromatic and caustic patterns", Proc. SPIE 2002, Ultrahigh- and High-Speed Photography, Videography, and Photonics '93, (11 October 1993); https://doi.org/10.1117/12.161356

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KEYWORDS

Silicon

Cameras

Control systems

Photoelasticity

Electrodes

Mirrors

Improvised explosive devices

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