Shock wave detection by light deflection technique

Min Gon Kim; Sung Soo Jung; Yong Tae Kim

doi:10.1117/12.145790

1 January 1993 Shock wave detection by light deflection technique

Min Gon Kim, Sung Soo Jung, Yong Tae Kim

Proceedings Volume 1801, 20th International Congress on High Speed Photography and Photonics; (1993) https://doi.org/10.1117/12.145790
Event: 20th International Congress on High Speed Photography and Photonics, 1992, Victoria, BC, Canada

Abstract

A noncontact shock (or acoustic) pulse detection system has been developed using optical probing of the refractive-index change associated with the pulse. The pulse profiles are monitored by the transient photorefractive deflection of collimated He-Ne probe laser beams. An increase in sensitivity of detection is achieved by an angular magnification of the deflection by refracting the deflected laser beam through a peripheral section of a converging lens. The transient deflection is observed by using a knife-edge to block half of the probe beam and detecting the deflection signal with a fast photodiode. By using two or more probe beams at different displacements from the pulse source and detecting their deflection at different times, the pulse velocity and attenuation in the medium can be determined. A demonstration of the capability of this system is made by the velocity measurements for shocks in a tube and for spark generated sound pulses in various media such as gas, liquids, and solid. Results agree well with those obtained by conventional technique. The proposed technique is superior to the conventional methods in that it is noncontact and easily applied to any hostile environment.

Citation Download Citation

Min Gon Kim, Sung Soo Jung, and Yong Tae Kim "Shock wave detection by light deflection technique", Proc. SPIE 1801, 20th International Congress on High Speed Photography and Photonics, (1 January 1993); https://doi.org/10.1117/12.145790

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