REFLECTION OF ELECTROMAGNETIC WAVES FROM SOUND WAVES

reportActive / Technical Report | Accession Number: AD0226886 | Open PDF

Abstract:

The reflection of electromagnetic waves normally incident on the wavefronts of a semi-infinite standing sound wave is discussed. By analogy with the Bragg reflection in optics, a maximum reflection occurs when the wavelength of the electromagnetic radiation in the sound perturbed region is twice the acoustic wavelength. Since the reflecting planes of maximum sound pressure disappear periodically, the reflected electromagnetic signal is modulated with the sound frequency. An experiment is described in which the Bragg reflection of 3 cm electromagnetic waves from a standing sound wave beneath a water surface is observed.

Author(s):
Schmitt, H. J.
Author Organization(s):
HARVARD UNIV CAMBRIDGE MA CRUFT LAB
Descriptive Note:
Technical rept.
Pagination:
0030

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release
Distribution Statement:
Approved For Public Release; Distribution Is Unlimited.

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
TR-310
Contract/Grant Number(s):
NONR-1866-32
Project Number(s):
NR-371-016
Monitor Series:
ONR
 Subject Terms
Joint Capability Areas:
JCA_1.2.7_Experimentation; JCA_1.2_Force Preparation; JCA_1_Force Support; JCA_3.2_Engagement; JCA_3_Force Application; JCA_1.2.3_Educating; JCA_3.2.1_Kinetic Means; JCA_5.3_Planning; JCA_5_Command and Control
Modernization Areas:
Microelectronics
Communities of Interest:
Advanced Electronics
Descriptor(s):
*ELECTROMAGNETIC WAVE REFLECTIONS, *SOUND WAVES, STANDING WAVES, SOUND PRESSURE, BRAGG ANGLE, PERTURBATIONS
Field(s)/Group(s):
Electricity and Magnetism
Keyword(s):
MOST PROJECT 5, DEBYE SEARS EXPERIMENT
Report Date:
1959 Aug 10