00000nam 2200000zi 4500 9.951551 CaOODSP 20250610092912 m o d f cr bn||||||||| 250529e199505##nscdo ob f000 0 eng d CaOODSP eng rda CaOODSP eng eng fre D68-21/44-1995E-PDF Osler, John C., author. Source level calibration of the DREA moving coil projector / John C. Osler - David M.F. Chapman ; approved by C.W. Bright. Dartmouth, N.S. : National Defence, Research and Development Branch = Défense nationale, Bureau de recherche et développement : Defence Research Establishment Atlantic = Centre de recherches pour la défense Atlantique, May 1995. 1 online resource (v, 30 pages) : graphs, photographs. text txt rdacontent computer c rdamedia online resource cr rdacarrier Technical memorandum ; 95/215 Digitized edition from print [produced by Defence Research and Development Canada]. Includes bibliographical references. "The Defence Research Establishment Atlantic moving coil projector (MCP) generates acoustic power at low frequencies (below 250 Hz) by displacing water with two pistons which oscillate in phase. The source level of the MCP must be continually monitored because it varies in accordance with the operating state of the projector. Source level as a function of time may be determined by combining measurements of the acceleration of the forward and aft pistons in an appropriate manner. This document establishes the methodology to use in this process by comparing at-sea measured transmission loss of CW signals to theoretical calculations. This comparison reveals that corrections are required to the source level derived from the MCP accelerometers at the higher end of its frequency range"--Abstract, page ii. Includes abstracts in English and French. Defence Research Establishment Atlantic. Centre de recherches pour la défense Atlantique. Acoustic localization Methodology. Projectors Calibration Methodology. Localisation acoustique Méthodologie. Projecteurs (Appareils de projection) Étalonnage Méthodologie. Defence Research Establishment Atlantic, issuing body. Canada. Department of National Defence. Research and Development Branch, issuing body. D.R.E.A. technical memorandum ; 95/215. (CaOODSP)9.941838 PDF 1.33 MB https://publications.gc.ca/collections/collection_2025/rddc-drdc/D68-21-44-1995-eng.pdf