Accession Number : AD0725865

Title :   Studies of N Waves from Weak Sparks in Air.

Descriptive Note : Final rept.,

Corporate Author : KALAMAZOO COLL MICH DEPT OF PHYSICS

Personal Author(s) : Wright,Wayne M.

Report Date : JUN 1971

Pagination or Media Count : 63

Abstract : The report summarizes work performed at Kalamazoo College during the period 1962-1970 on the study of acoustic transients in air. The major portion of this research was a many faceted study of the acoustic transients produced in air by weak sparks. The spark energies were in the range 0.0016 - 0.56 J, and the acoustic waveforms resembled N waves with durations of 10 - 40 microseconds and amplitudes of the order of 0.01 atmosphere. These waveforms were observed by means of wide-band condenser microphones. It was possible to reproduce a weak shock with a rise time as short as 1/2 microseconds. Topics investigated include the dependence of acoustic waveform upon propagation direction, spark length, and discharge energy; the distortion of the wave profile with propagation distance; and the diffraction and scattering of N waves from rectangular plates, circular discs, and cylindrical rods. (Author)

Descriptors :   (*ELECTRIC DISCHARGES, ACOUSTIC PROPERTIES), SOUND TRANSMISSION, GAS DISCHARGES, SHOCK WAVES, SONIC BOOM, TRANSIENTS

Subject Categories : Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE