Physics
Scientific paper
Nov 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975p%26ss...23.1519e&link_type=abstract
Planetary and Space Science, vol. 23, Nov. 1975, p. 1519-1525.
Physics
15
Hypervelocity Impact, Light Emission, Metal Particles, Microparticles, Optical Measurement, Cosmic Dust, Iron, Meteoritic Damage, Micrometeoroids, Projectile Cratering, Radiant Flux Density
Scientific paper
The impact light flash produced by electrostatically accelerated iron particles with diameters ranging from 5 to 0.05 micron and velocities lying between 1 km/sec and 30 km/sec has been investigated by means of photomultipliers. A target materials, mainly gold and tungsten were used. The pulse of the multiplier was registered directly and after electronic integration. The pulse height of the multiplier signal, the amplitude of the integrated signal as well as its rise time were found to be unique functions of the mass and velocity of the impacting particle. Using the spectral distribution of the light intensity, measured by means of calibrated photomultipliers, the total amount of light energy emitted in the visible range could be calculated. The variation of the impact flash intensity with the target material and the measured spectral distribution allowed the temperature of the crater after the impact to be estimated.
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