Diffraction of Spark-Produced Acoustic Impulses
作者:
Wayne M. Wright,
James L. McKittrick,
期刊:
American Journal of Physics
(AIP Available online 1967)
卷期:
Volume 35,
issue 2
页码: 124-128
ISSN:0002-9505
年代: 1967
DOI:10.1119/1.1973907
出版商: American Association of Physics Teachers
数据来源: AIP
摘要:
A transient electrical discharge in air serves as a convenient source of acoustic impulses for studies of wave diffraction. “Nwaves,” with initial shocks about 0.01 atm in magnitude and with durations of less than 30 μsec at 10 cm distance, are produced by sparks having discharge energies of 0.05 J. They are detected with wide-band condenser microphones, which utilize a14-mil metallized Mylar diaphragm supported partially by the thin layer of air trapped on a machined brass surface. The receiving response is nominally flat to above12MHz. Phenomena which are demonstrated here include the diffraction ofNwaves incident upon circular disks and narrow rectangular plates.
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