INDEX 



The subject indexes of all SIR volumes are combined in a master index printed in a separate volume. 

 For access to the index volume consult the Army or Navy Agency listed on the reverse of the half-title page. 



Absorbing paint. 122 



Acoustic axis, transducer, 21. 35 



Acoustic center, transducer, 13, 63 



Acoustic impedance, transducer. 12 



Acoustic lens, 11 1 



Acoustic materials testing. 100 



Acoustic measurements, theory 



see Calibration theory, transducer 

 Acoustic power of transducer, theory, 14 

 Acoustic pressure measurement. 58. 60 

 Acoustic radius, transducer, 31. 155 

 Acoustic screens, 15 

 Acoustic tests and equipment 



see Mountain Lakes Test Station: 

 Orlando Test Station 

 Air calibration of transducers, 59 

 Amplifier circuits. 72. 74. 75. 84, 104, 



100, 118, 119. 124 

 Automatic volume control circuit, 104 

 Available power, transducer. 20, 35. 114 



Baffles, acoustic, 44 



bubble screens, 163 



diffraction effects, 157 



transmission loss, 99. 157 

 Band-pass filter, variable, 137 

 Barge system, Orlando lest Station. 



133 

 BD1 transducer, symmetry tests. 96 

 Beat frequency oscillator. 71 

 Blocked impedance, transducer, 64 

 Broad-band transducer, calibration. 66 

 Hubble screens, 163 

 Bubble-layer paint, 122 

 Buffer-amplifier circuit, 76 



Calibration compulations, transducer, 

 138-148 



current charts. 1 16 



log sheets, 138 



receiving charts, 138 



reciprocity constant charts, 145 



transmitting charts, 143 

 Calibration equipment, recommenda- 

 tions for improvement, 134-137 



absorbing materials, 137 



directivity index measurement, 137 



phase measurement, 136 



pulse recorder, 137 



recording impedance bridge, 137 



transducer response equalizer, 135 



transient analyzer, 136 



variable bandpass filter, 137 



Calibration techniques, transducer 



111)1 transduce] symmetry, 96 



((inversion of air calibrations, 59 



coupling. 91 



directivity pattern, 95, 97, 150 



impedance, 64, 97. 150 



low frequency calibrations, 115—119 



motional impedance method, 01 



noise. 94 



proximity corrections. 52-58 



reciprocity method. 98 



reflection effects, 40-50, 150 



response, 94. 97 



sound-pressure measurements. 58, 60 



standard transducers, 65 



testing site requirements, 37-40 



use of acoustic tanks, 10. 109. 120. 150. 

 151 



wide-band calibration, 66 

 Calibration theory, transducer, 18-37 



directivity, 21-26, 35 



projector efficiency. 26 



receiving response, 27, 35 



relations between characteristics, 31- 

 33 



selectivity, 27 



threshold pressure. 28-30 



transmitting response, 20. 35 

 Capacitance bridge, high frequency, 126 

 Charts for transducer calibration. 138- 



146 

 Circuits, electronic 



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

 119, 124 



AVC. 104 



detector, 76, 106 



filters, 84 



gating, 81 



impedance bridge, 125 



modulator, 82 



noise generator, 107 



phase bridge, 136 



power supply, 107 



pulse rectifier, 81 



recorder, 78 



signal generator. 71. 81. 104, 127 



transducer coupling, 74, 105, 124 



transmission measuring. 84 

 Computations for transducer calibra- 

 tion. 138-118 

 Condenser-type hydrophone, 60 

 Converter circuit, 77 

 Coupling, theory of transducer. 1 1 



Coupling circuits, transducer. 71. 105, 



124 

 Coupling constant, transducer, II. II 

 Crest factor, acoustic wave, 67. 101 

 Crystal filter. 70 



Crystal transducer, charge on, 28 

 Current dunts. transducer calibration, 



146 



Detector circuits, 76, 106 

 Diaphragm motion, theory, 10 

 Diffraction around baliles. 157 

 Dipole source, directive pattern, II 

 Directional sources used in transducer 



calibration. II 

 Directivity factor, transducer. 15 

 Directivity index, transducer 

 computation from patterns, 21, 01, 



144 

 desirability for high directivity. 9 

 direct measuring device. 137 

 Directivity patterns, theory. 7. II 

 Directivity patterns, theory of measure- 

 ment. 21, 35 

 Dome design, transducer. 153-156 

 Dome tests, transducer. 99 



Echo-ranging system tests in lakes. 10.'! 

 Effective area, transducer, 16, 31 

 Efficiency, theory of transducer, 14, 26 

 Electrical impedance, effective trans- 

 ducer, 1 1 

 Electroacoustic transducer theory, 10-17 

 Electromechanical transducer theory, 10 

 Electronic switch, 127 

 Equipment, acoustic test 

 see Mountain Lakes Test Station; 

 Orlando Lest Station 

 Equivalent circuit for transducer, 27 



Filters, crystal, 70 



Filters, electrical, 84. 137 



Focussing in acoustic tanks. Ill 



Formulas 



acoustic pressure-gradient, 52 

 baffle transmission loss. 157 

 connections between transducer char- 

 acteristics, 31-33 

 diffraction, circular baffle, 157 

 directivity patterns, 53 

 dome reflection coefficient, 155 

 dome transmission loss, 154 

 interference pattern. 40. 50 



17.1 



