BS 7041:1989 - Specification for characteristics and calibration of hydrophones for operation in the frequency range 0.5 MHz to 15 MHz
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The British Standard BS 7041:1989, titled "Specification for Characteristics and Calibration of Hydrophones for Operation in the Frequency Range 0.5 MHz to 15 MHz", establishes standardized requirements for the performance characteristics and calibration procedures of hydrophones used in ultrasonic measurements, particularly within the medical diagnostic field.