Optical pin apparatus for measuring the arrival time and velocit

Details Optical pin apparatus for measuring the arrival time and velocit Optical pin apparatus for measuring the arrival time and velocit

1983-10-18

1987-03-10

Tarcza, Thomas H.

Communications, electrical: acoustic wave systems and devices

Signal transducers

Underwater type

367191, H04R 2300

Patent

active

046495282

ABSTRACT:
An apparatus for the detection of the arrival and for the determination of the velocity of disturbances such as shock-wave fronts and/or projectiles. Optical pins using fluid-filled microballoons as the light source and an optical fiber as a link to a photodetector have been used to investigate shock-waves and projectiles. A microballoon filled with a noble gas is affixed to one end of a fiber-optic cable, and the other end of the cable is attached to a high-speed streak camera. As the shock-front or projectile compresses the microballoon, the gas inside is heated and compressed producing a bright flash of light. The flash of light is transmitted via the optic cable to the streak camera where it is recorded. One image-converter streak camera is capable of recording information from more than 100 microballoon-cable combinations simultaneously.

REFERENCES:
"Nanosecond Hydrodynamic Diagnostics . . . " Proc. 12th International Congress on High Speed Photo., SPIE vol. 97, Aug. 1-7, 1976.
"New Measuring Use for Microballoons," Los Alamos News Bulletin, pp. 1 and 3, 8/83.
"Plasma Physics and Controlled . . . " Reprint, Int. Atomic Energy Agency, Vienna, 1975.
"Fabrication of Glass Microballoons . . . " VCRL-51609, 7/74.

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