ASA 124th Meeting New Orleans 1992 October

4pEA9. Acoustic test facilities at the Applied Research Lab/Penn State.

W. Jack Hughes

Appl. Res. Lab., Penn State Univ., P.O. Box 30, State College, PA 16804

The acoustic test facilities at ARL/PSU consists of an anechoic tank and a high-pressure tank. The anechoic tank is isolated from the building and is used for acoustic measurements such as calibrated frequency responses, directivity patterns, impedance parameters, target strength, echo reduction, etc., over a frequency range of 300 Hz to 500 kHz. The 5-ft-diam high-pressure tank is used to perform frequency response calibrations up to a pressure of 15 000 psi. A computer-controlled measurement system (based on an HP3570/HP3330 combination and an HP series 9000 model 320 computer) typically generates short-pulsed gated signals and a time-delayed gate for testing. Long pulse or continuous wave operation is also used to calibrate transducers at close distances and low frequencies. A description of the printed data output and thoughts on a replacement data collection system will be presented.