Abstract
Theoretically, absolute measurement of the ultrasonic pressure amplitude in a plane progressive wave can be made using one or more optical methods. Three optical methods are described. Considerations for the use of the different methods are discussed. Experimental results obtained under identical conditions are given. These results show good internal agreement, but the accuracy of the absolute values of pressure is limited by the accuracy to which the piezo-optic coefficient is known. (This work was supported by the Office of Naval Research.)
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