174 



INDEX 



Frequency response calibration, trans- 

 ducer, 66 

 Frequency scaling, 114 

 Fungicide for water, 109 



Gating circuit, 81 



Generator circuits, signal, 71, 81, 104, 



107. 127 

 Green's function, 12 



Harmonic analyzer, 125 

 High-frequency instruments, 126 

 High-frequency transducer tests, 104- 



115 

 High-power amplifier, 119 

 High-power transducer tests, 119 

 Hydrophone 

 see Transducer 



Impedance, transducer 



acoustic, 12 



blocked, 11, 64 



calibration techniques, 64, 97. 150 



coupling circuits. 74, 105. 124 



effective electrical. 11 



mechanical. 1 1 



motional. 12 



radiation. 1 1, 16-17, 59 



terminating, 1 1 



theory, 11. 36 

 Impedance bridges, 125, 137 

 Instruments, high-frequency 



capacitance bridge, 126 



peak voltmeter, 126 

 Interference pattern formulas, 40. 50 

 Interference-elimination in acoustic 

 testing. 40-50 



Lakes as acoustic test stations, 39 

 Lenses, acoustic, 44. Ill 

 Level recorder, polar acoustic. 80 

 Line source, directive pattern, 42 

 Listening system tactics, sonar. 9 

 Load impedance, transducer, 1 1 

 Load-run observations, transducer. 97 

 Log sheets, transducer calibration. 138 

 Low-frequency tests, transducer, 115- 

 119 



Materials tests, acoustic. 100 

 Mechanical impedance, transducer, 11 

 Meters, electrical test. 126, 127 

 Models, use in acoustic tests, 114 

 Modulator circuits. 82 

 Motional impedance, transducer. 12 

 Mountain Lakes Test Station. 68-129 

 Mountain Lakes Test Station, electrical 

 equipment, 71-84 

 amplifiers, 72, 74, 75, 84, 104. 106, 118, 

 119, 124 



co-axial lines, 73, 107 



detector circuits, 76. 106 



filters, 84 



impedance bridges, 125 



modulator circuits. 82 



noise generator. 107 



power supplies, 107 



recommendations for improvement, 

 134-137 



recorders, 78. 84, 107 



signal generator, 71, 81, 104. 127 



test meters, 126, 127 



transducer couplings. 74. 105. 121 



transmission measuring set, 84 



tuning indicator, 77 

 Mountain Lakes Test Station, mechani- 

 cal equipment, 84-90 

 Mountain Lakes Test Station, site 



characteristics, 68 

 Mountain Lakes Test Station, test sys- 

 tems 



high-frequency test system. 104-115 



high-power test system, 119 



low-frequency test system. 115-119 



preparations for test runs. 88-94 



test systems No. 1 and 2: 71-88 



testing tanks. 109. 120 

 Mountain Lakes Test Station, types of 

 tests 



analysis of transients, 123 



baffle studies, 99 



BD1 transducer, symmetry, 96 



dome studies. 99 



echo-ranging systems. 103 



frequency scaling. 1 14 



materials studies, 100 



signal generator tests, 100 



transducer coupling, 94 



transducer directivity, 95, 97 



transducer impedance, 97 



transducer noise, 94 



transducer reciprocity calibration, 98 



transducer response. 94. 97 



Noise generator, electronic, 107 



Open-circuit voltage, transducer, 28 

 Optical measurement of acoustic pres- 

 sure. 60 

 Orlando Test Station 



barge system, 133 



high-power amplifier. 119 



mechanical facilities. 129 



recommendations for improvement, 

 134-137 



recorder, 132 

 Oscillator, beat-frequency, 71 



Paint, absorbing. 122 

 Phase bridge, 136 



Phase measurements, acoustic, 136 

 Piston source, directive pattern, 41 

 Polar acoustic level recorder. 80 

 Power output of transducer, theory, 16 

 Power supplies, 107 

 Pressure gradient formulas, 52 

 Pressure measurement, acoustic, 58, 60 

 Production testing of transducers, 149- 



152 

 Projector, acoustic 



see Transducer 

 Proximity collections in transducer 



calibration, 52-58 

 Pulse generator circuit, 81 

 Pulse rectifier circuit, 81 



Q of transducer, 27, 47 



Radiation impedance, transducer, 11, 



16-17 

 in air, 59 

 Radiation pressure measurement, 58, 



61 

 Radius, transducer acoustic, 31 

 Rayleigh disk. 58. 60 

 Receiving charts, transducer, 138 

 Receiving efficiency of transducer, 



theory, 16 

 Receiving sensitivity, transducer, 13,27, 



35 

 Reciprocity calibration of transducer, 



61-62 

 Reciprocity constant charts, 145 

 Reciprocity theorem for transducers, 14, 



31 

 Recorders, acoustic level, 78. 106, 132, 



137 

 Rectifier circuit, pulse. 81 

 Reflection coefficient of dome, 155 

 Reflections, effect on transducer cali- 

 bration, 40-50 

 correcting for reflection, 48-50 

 interference pattern formulas, 40, 50 

 use of directional sources, 41 

 use of frequency variation, 46 

 use of pulse methods, 47 

 use of screens. 44 

 Relaxation oscillator. 81 

 Response of transducer, theory, 12. 20. 



27. 35 

 Response equalizer, transducer, 135 

 Rigging, definition. 38 

 Rotator mechanism, Mountain Lakes. 



85 



Scale model testing. 111 

 Screens, acoustic. 44, 86 

 Selectivity of transducer, theory, 27 

 Series connection of transducers, theory, 

 14 



