00000nam 2200000zi 4500 9.942895 CaOODSP 20240916150842 m o d f cr mn||||||||| 240905e197611##nscd ob f000 0 eng d CaOODSP eng rda CaOODSP eng eng fre D68-21/1-1976E-PDF Hodson, C., author. Hydrophone calibration by the substitution method using pseudo-gaussian white noise / C. Hodson, G.W. McMahon ; approved by R.A. Kendall. Dartmouth, N.S. : Canada Research and Development Branch, Department of National Defence, Defence Research Establishment Atlantic, November 1976. 1 online resource (v, 18 pages, 2 unnumbered pages) : graphs. text txt rdacontent computer c rdamedia online resource cr rdacarrier D.R.E.A. technical memorandum ; 76/B Digitized edition from print [produced by Defence Research and Development Canada]. Includes bibliographical references (page 16). "A computer-based procedure has been developed for calibrating hydrophones by the substitution method using a pseudo-gaussian white noise signal. The technique has been shown to be a viable alternative to the more conventional CW and pulsed CW substitution methods. Owing to the wideband nature of the noise signal, the effects of boundary conditions are reduced considerably. Software routines for a Honeywell H-316 minicomputer are used to generate the noise signal, perform the analog-to-digital sampling and carry out the calibration computations. This method is particularly useful for low frequency wideband calibration and would allow measurement to less than one Hertz"--Abstract, page ii. Includes abstracts in English and French. Hydrophone Calibration. Underwater acoustics Instruments. Random noise theory. Hydrophones Étalonnage. Acoustique sous-marine Instruments. Théorie du bruit aléatoire. Defence Research Establishment Atlantic, issuing body. D.R.E.A. technical memorandum ; 76/B. (CaOODSP)9.941838 PDF 1.11 MB https://publications.gc.ca/collections/collection_2024/rddc-drdc/D68-21-1-1976-eng.pdf