Investigation of high-speed impact phenomena /III/, volume I

Facilities, equipment, techniques, and experimental procedures for high speed meteoritic impact phenomen

Response of microphone meteorite detectors to the impact of high velocity particles

Response of microphone meteorite detectors to impact of high velocity particle

Particle parameter selection system for an electrostatic particle accelerator

Particle selection system for electrostatic accelerator for hypervelocity impact testin

Experiments on the impact-light-flash at high velocities

Impact-light-flash at high velocities - particle acceleration and analysis - two-color temperature measuremen

Impact ionization from fragile targets

Hypervelocity impact ionization from fragile target

Ionization probability of iron particles at meteoric velocities

Ion pairs produced by total ablation of iron particles in air and argon measured as function of particle velocit

Apparatus for handling micron size range particulate material

An apparatus for handling, transporting, or size classifying comminuted material was described in detail. Electrostatic acceleration techniques for classifying particles as to size in the particle range from 0.1 to about 100 microns diameter were employed

A novel high voltage pulse generator

High voltage pulse generator with solid state components - transistor circuit

Ionization probability of iron particles at meteoritic velocities

Ion production for ablation of micron size iron particles moving at supersonic speed in air and argo

Determination of meteor parameters using laboratory simulation techniques

Atmospheric entry of meteoritic bodies is conveniently and accurately simulated in the laboratory by techniques which employ the charging and electrostatic acceleration of macroscopic solid particles. Velocities from below 10 to above 50 km/s are achieved for particle materials which are elemental meteoroid constituents or mineral compounds with characteristics similar to those of meteoritic stone. The velocity, mass, and kinetic energy of each particle are measured nondestructively, after which the particle enters a target gas region. Because of the small particle size, free molecule flow is obtained. At typical operating pressures (0.1 to 0.5 torr), complete particle ablation occurs over distances of 25 to 50 cm; the spatial extent of the atmospheric interaction phenomena is correspondingly small. Procedures have been developed for measuring the spectrum of light from luminous trails and the values of fundamental quantities defined in meteor theory. It is shown that laboratory values for iron are in excellent agreement with those for 9 to 11 km/s artificial meteors produced by rocket injection of iron bodies into the atmosphere