Calibration of Underwater Acoustic Transducers at NRL/USRD
NAVAL RESEARCH LAB ORLANDO FL UNDERWATER SOUND REFERENCE DETACHMENT
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At the beginning of World War II, the United States recognized the need for establishing systematic methods for calibrating and evaluating sonar transducers and established the Underwater Sound Reference Laboratories. The Underwater Sound Reference Detachment of the Naval Research Laboratory evolved from this beginning and now serves as the focus for underwater acoustic metrology in the United States. It functions as a National Bureau of Standards for Underwater Acoustics by providing two types of reference services for a fee. Calibration, test, and evaluation services and standard transducer loan service cover the frequency of 0.2 Hz to 2 MHz. This paper describes the calibration, test, and evaluation services. It first covers the measurement facilities for performing the services. Measurement methods for calibrating transducers are then discussed. Next a description of ongoing research in calibration measurement methodology is presented. Finally, some comments are made about calibration system requirements for implementing new measurement techniques.
- Acoustic Detection and Detectors