Abstract
A fluid suitable for use in all liquid-filled transducers has long been needed. Historically, castor oil has been the most satisfactory; however, it will no longer meet all requirements. Substitute fluids have been used in special cases, but these have serious limitations even under the best of conditions. Studies have been made on silicone fluids and polyglycols as well as castor oil to determine their eligibility as a sound energy transfer medium in sonar transducers. Acceptability criteria covering acoustical, chemical, physical, and environmental properties are discussed. A modified polyalkylene glycol has been found to possess compatible features with transducer materials and to meet the criteria for a fluid to use in all sonar transducers.
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