A Laser Technique for Calibration of Piezoelectric Transducers Used to Measure Underwater Shock Pressures.

摘要

A crossed beam laser Dopplermeter was used to measure particle velocity at an explosively generated shock front in water. The shock front velocity was measured by detecting the time interval required for the shock front to intersect two parallel laser beams a known distance apart. A tourmaline piezoelectric gage was positioned at the same distance from the explosive charge as was the point of intersection of the crossed beam system. The peak shock overpressure as indicated by the tourmaline transducer was the same as that calculated by the product of front velocity times particle velocity times density of the undisturbed water. Although the system is marginal for measuring particle velocity with existing equipment,it is anticipated that normal technological advances will eventually permit such a system to be used to calibrate underwater shock transducers. (Author)