. Basic methods for the calibration of sonar equipment. MANOMETER -PROJECTOR -TO Lto air VACUUM COMPRESSOR PUMP WATER HEATER Figure 52. Opcialiny ul li\(li;iiilu ananyeiiieiil lor lou IreciiieiKV s\sitiii. lo ilic \entiiig cock at tlic top. When tlii' sxsleni is Ircslih lilkd. the ^vaici ma) be heated and eiiciihited imder \aeuuni lo decrease the amount ol air in sohi- tion. ihoiigii tile chamber and instrument are care- lidly del3iil)l)led by hand Ijelore each test. Hydrostatir Prt'ssiire Cluuulwr. Hxclrostatic pres- stncs lip to 100 ])oiinds per stjiiare inch are olitained by the
. Basic methods for the calibration of sonar equipment. MANOMETER -PROJECTOR -TO Lto air VACUUM COMPRESSOR PUMP WATER HEATER Figure 52. Opcialiny ul li\(li;iiilu ananyeiiieiil lor lou IreciiieiKV s\sitiii. lo ilic \entiiig cock at tlic top. When tlii' sxsleni is Ircslih lilkd. the ^vaici ma) be heated and eiiciihited imder \aeuuni lo decrease the amount ol air in sohi- tion. ihoiigii tile chamber and instrument are care- lidly del3iil)l)led by hand Ijelore each test. Hydrostatir Prt'ssiire Cluuulwr. Hxclrostatic pres- stncs lip to 100 ])oiinds per stjiiare inch are olitained by the use of air from a small compressor unit. The pressure is transmitted throngli a moulded rubber bag of negligible stiffness, mounted in a Ijronze chamber. As may be seen in Figure 52, the water side of the Ijag connects to the calibration cliamber through a line with high acoustic impedance. The air line connects to both the pressure chamber and the rear cliamber of the sound source through suit- able control valves, thus etjualizing the pressures on the sound source diaphragm. A manometer is con- nected to the system in such a way that the pressure differential may be checked at all times. Since there is need during a liydrophone calibration to read the mercury column to within ± mm, an optical sys- tem was used which allows displacements of less than 1 cm to be read within ± mm without D LIFTING MECHANISM FOR TOP l"DIA STEEL SHAFT o, 1^—SCREW-MALE ff^ /SCREW-FEMALE OIA STEEL BAU. SEMI-POLISHED SURFACE !i?i. Calibialion seclioii ot low-tiequciicy system tank, shouini; lop lifting mechanism and major di- Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Office of Scientific Research and Development. National Defense Research Committee. Washington,
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