450 CPS Electro-Hydroacoustic Transducer Tests in Seneca Lake
GENERAL DYNAMICS/ELECTRONICS ROCHESTER NY
Pagination or Media Count:
Low level measurements on the 450 cps Electro-hydroacoustic Research Source indicate remarkably good agreement with the theoretical directivity pattern and radiation impedance as provided by the U.S. Navy Underwater Sound Lab. The transducer piston resonant frequency in water is 1 lower than design value. The in-air Q of the piston assembly is approximately 43, and the in- water Q approximately 3.2. On the basis of these Q measurements, the mechano- acoustic efficiency of the piston circuit should be in excess of 90. From direct measurements of power radiated to the far field and power in-put to the piston circuit the actual mechano-acoustic efficiency appears to be closer to 55 to 60. An anomalous loss is therefore in evidence when the transducer is submerged in water.
- Acoustic Detection and Detectors