INDIA 



175 



Shielding of circuits, 10H 



Signal generator circuits, 71, 81, 104, 

 107. 127 



Signal generator performance testing, 

 101 



Site requirements for acoustic calibra- 

 tions, 37-to 



Sono buoy, 9 



Sound-pressure measurement, 58, (iO 



Spherical wave correction chart, I II 



Square-wave generator, 127 



Standard hydrophones and projectors, 

 1 , 58, 65 



Still transducer, calibration, 59 



Stillness of acoustic calibration cham- 

 ber, 116 



Tanks for acoustic tests. 10, 109, 120, 



150, 151 

 Tapered transducers, 25 

 Termination, transducer. 11 

 Test equipment and lest stations, acous- 

 tic 

 see Mountain Takes Test Station: 

 Orlando Test Station 

 Testing, transducer 

 see Calibration techniques, transduc- 

 er; Calibration theory, transducer 

 Theory of acoustic calibrations 

 see Calibration theory, transducer 



Theory of electroacoustic transducers, 



10-17 

 Thermal noise, 16, 28 



use for transducer calibration, 16 

 Thermocouple voltmeter, 126 

 Thermocouple wattmeter, 127 

 Threshold pressure, transducer. 16, 28- 



30 

 Time constant, transducer, 48 

 Time constant formulas, circuit. 17 

 Transducer calibration 

 see Calibration techniques, transduc- 

 er; Calibration theory, transducer 

 Transducer calibration computations. 



138-118 

 Transducer coupling circuits, 71, 105, 



124 

 Transducer dome design, 153-151) 

 Transducer response equalizer, 135 

 Transducer theory, electroacoustic, 10- 

 17 

 complex diaphragm motion, 16 

 connections between characteristics, 



31-33 

 coupling conditions. I 1 

 directivity, 7. 1 1 

 efficiency, 14, 26 

 equivalent circuit. 27 

 impedances, 1 1, 36 

 power output, 16 

 reciprocity theorem, 14, 62 



sensitivities, 12-14 

 transducers in series, 14 

 Transducer theory, electromechanical, 



10 

 Transducer time constant, 18 

 Transducer types, 1, 5 

 Transfer constant, transducer, 11,11 

 Transients, analysis of acoustic, 123, 136 

 Transition loss, transducer. 20 

 Transmission lines, coaxial. 73, 107 

 Transmission loss in baffles, 157 

 Transmission loss in domes. 153 

 Transmission measuring set. 84 

 Transmitting charts, transducer, 143 

 "Transmitting sensitivity, transducer, 12, 



14.20,35 

 Tuning indicator. 77 



USRL Test Stations 

 see Mountain Takes Test Station; 

 Orlando Test Station 



Voltmeter, peak, 126 

 Voltmeter, thermocouple, 126 



Warbled signal lor transducer calibra- 

 tion, 46 

 Water, fungicide for, 109 

 Wattmeter, recording, 128 

 Wattmeter, thermocouple, 127 

 Wide-band transducers, calibration, 66 



