440 



MECHANICAL AND ACOUSTICAL SENSES 



CIRCUIT 

 MODULE 



^ 



"""W 



Lv^*a<1 



BATTERY 

 MODULE 



5 rmf 



1.05 in 



± 



3.5 - 4.0 in. 



]^ 



SENSOR 

 MODULE 



V 



rc 



CIRCUIT 

 MODULE 



SSSS' 





x 



BATTERY 

 MODULE 



PZT 



TOP 

 VIEW 



SIDE 

 VIEW 



3.5 in 



Figure 11 Various packaging arrangements for tubular, air-filled, O-ring sealed ultrasonic 

 transmitters: (A) Single tube with plain end caps, removable circuit and battery. (B) 

 Single tube with separate modules for battery and sensors, allowing use of various types 

 of sensors and/or batteries with the basic transmitter module. (C) Single tube with PZT 

 transducer mounted vertically for more omnidirectional radiation in the horizontal plane. 

 (D) Twin-tube configuration for mounting on dorsal fin of shark (or to avoid a single tube 

 of excessive length). (E) Sealing detail (simple push-in connection, held in by hydrostatic 

 pressure and/or by tightness of the press-fit). (F) Sealing detail (two-turn threaded 

 system, showing type of electrical contacts usable with a rotating connection). Diagrams 

 not to scale. 



a. PZT acoustic transducer 



b. Transformer (in ferrite-cup core) 



c. Epoxy potting (between PZT and inside of tube) 



d. Miniature pin connectors (male and female) 



e. Neoprene O-ring 



f. Printed-circuit board with copper contact areas (outer ring, center disk) 



g. Spring-loaded electrical contacts 



h. Route of two long registration pins used as tools to align connectors when inserting 

 circuit module. 



