Accession Number : AD0483926

Title :   SOUND VELOCITIES NEAR THE GROUND IN THE VICINITY OF AN ATOMIC EXPLOSION.

Descriptive Note : Report to the test director,

Corporate Author : NAVY ELECTRONICS LAB SAN DIEGO CA

Personal Author(s) : McLoughlin, R. C. ; Foushee, F. C.

Report Date : JAN 1955

Pagination or Media Count : 68

Abstract : Sound velocities in the air close to the ground near the nuclear detonations of Shots 9 and 10 were measured by determining the transit time of acoustic signals across air paths of known lengths. The regular velocity meters were oriented in such a way as to measure the sum total of wind velocity along the blast line and acoustic velocity due to temperature. A device called a particle velocity meter was also used and this was to measure both preshock and postshock wind velocities separating them into their components in three mutually perpendicular directions and giving the velocities due to temperature alone as well. Measurements were made at elevations of 3 1/2 and 10 ft over various types of terrain, namely desert soil, fir boughs, black iron, and sand covered with emulsified asphalt at intended ground zero. (Author)

Descriptors :   (*NUCLEAR EXPLOSIONS, SOUND TRANSMISSION), INSTRUMENTATION, NEVADA, AIRBURST, ACOUSTIC SIGNALS, SHOCK WAVES, WIND, VELOCITY, ATMOSPHERIC TEMPERATURE, RANGE(DISTANCE), TREES, DESERTS, HEAT TRANSFER, ASPHALT, SOUND.

Subject Categories : Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE