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The use of GaAsP light emitting diodes as pulsed light sources for high-speed photography is discussed. Two applications are des-cribed: single-shot photography with pulses ca. 1 p,s long, and stroboscopic visualization of ultrasound with 50 ns flashes. The luminous efficiency and current capacity of the LEDs was considerably enhanced by cooling them to 77 K in liquid nitrogen.© (1979) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only. |
