Blar i Fiskeridirektoratets skrifter, Serie Havundersøkelser (1900-1990) på forfatter "Knudsen, Hans Petter"
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Standard calibration of echo sounders and integrators with optimal copper spheres
Foote, Kenneth G.; Knudsen, Hans Petter; Vestnes, Gudmund (Fiskeridirektoratets skrifter, Serie Havundersøkelser, Research report, 1983)Calibration of fisheries echo sounders and integrators by means of optimal copper spheres is reviewed. The standard procedure is elaborated. Maintenance of O.1 dB precision is described for a wide range of temperatures ... -
Time-Amplitude-Frequency (T-A-F) - A special electronic unit for measuring the TVG function of research echo sounders
Knudsen, Hans Petter (Fiskeridirektoratets skrifter, Serie Havundersøkelser, Research report, 1985)High precision in hydroacoustic instruments for fisheries research demands high precision and reliability in the test instruments. To simplify the test measurements, a special test unit has been developed. The operating ...