PROBLEM 



Design, develop, and construct a pressure vessel 

 that will encapsulate a sonar transducer under test and 

 permit calibration under pressure. 



RESULTS 



1. A pressure vessel with favorable acoustical proper- 

 ties was built under contract. 



2. It was designed to house only the test transducer. 



3. Maximum operating pressure is 800 psig for long- 

 term cycling. 



4. Maximum operating frequency is 500 kc/s. 



5. The mounting mechanism holds the transducer on 

 the regular calibration column either inside or outside the 

 vessel. 



RECOMMENDATIONS 



1. Consider the use of acoustically transparent pres- 

 sure vessels for evaluating sonar transducers. 



2. Consider a mounting mechanism that holds the vessel 

 on the regular calibration column with the test transducer 

 inside the vessel. 



3. Consider the vessel as part of the rotating system to 

 obtain polar patterns of the transducer. 



MBL/WHOI 



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