Acoustic Characteristics of the ARL/FEU Ellipsoidal Reflecting Hydrophone.
PENNSYLVANIA STATE UNIV UNIVERSITY PARK APPLIED RESEARCH LAB
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Acoustic measurements in the Applied Research Laboratorys 48-inch water tunnel are often-times performed using an ellipsoidal reflecting hydrophone which is submerged in a water-filled tank located on the east side of the test section. Acoustic energy originating within the test section then propagates to the receiver via the acoustically transparent viewing windows. The reflector of this hydrophone system was originally fabricated by welding together two ellipsoidal-shaped spinnings along their perimeter while maintaining an air void between them. Recent indications were that leaks had developed, thus destroying the air void and, hence, the reflecting medium. The concave surface was then lined highly reflective bubble rubber as a substitute for the true air void. This memorandum describes the changes in acoustic characteristics as a result of this and other modifications to the system. Author
- Electrical and Electronic Equipment
- Test Facilities, Equipment and Methods