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Description of the laser stroboscope and its applications

: Kleinschnittger, A.; Stilp, A.

41st Meeting of the Aeroballistic Range Association '90. Proceedings
15 S. : Abb.
Aeroballistic Range Association (Meeting) <41, 1990, San Diego/Calif.>
Fraunhofer EMI ()
breakthrough of projectile; distance-time behaviour; Drehspiegelkamera; Endballistik; high speed photography; Hochgeschwindigkeitsphotographie; initiation of explosive; laser stroboscope; Laserstroboskop; material behaviour; Materialverhalten; plate velocity; Plattengeschwindigkeit; Projektildurchbruch; residual velocity; Restgeschwindigkeit; rotating mirror camera; Schatten-Schlierenphotographie; shadow-schlieren photography; terminal ballistics; Weg-Zeit-Verhalten; Zündung von Sprengstoff

High speed photography is the most efficient method to get insight into terminal ballistics, explosive events etc., generally in processes with fast motions and deformations. Two basic operating principles are mostly applied: Continuous light source and image dissection and exposure time are established at the camera side or pulsed light source and only image dissection at the recording side. To get a large number of pictures (more than 20) with frequencies in the range of 50,000 - 500,000 and very short exposure times (less than 100 ns), the EMI developed a laser stroboscope with a simple rotating mirror camera for image dissection with the following technical data: - pulsed laser flashes with frequencies in the range from 50 - 500 kHz - short explosure time (less than 20 ns) with high flash intensities - duration of the flash series in the millisecond range - picture size of diam. 24 mm at a flashing frequency of 100 kHz - alternatively triggering of laser stroboscope and event. The stroboscope has been used for the following test objects: - study of the behaviour of reactive armors initiation of explosives, plate velocity etc. - breakthrough of projectiles and behind armor debris studies - initiation of HE by hypervelocity debris clouds - burst of liquid filled tanks by hypervelocity fragments.