Target Strength Measurements on Metal Spheres
نویسنده
چکیده
Introduction The estimation of fish abundance by the echo-integrator method requires a sonar that has been accurately calibrated. This may be done by measuring the signal received from a target whose acoustic properties are known. Several kinds of metal spheres have been used as calibration targets, in particular brass (Forbes, Simmonds and Edwards, 19801, copper (Foote, et a/., 1981) and tungsten carbide spheres (Dragonette, Numrich and Frank, 1981).
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