Abstract
The optical methods of investigating ultrasonic waves played an important role in the early investigations of finite-amplitude acoustics, particularly in experimental determinations of the nonlinear parameter B/A of water. However, after thermodynamic methods were discovered for obtaining B/A, the optical methods did not then, and have not as yet, yielded values in agreement. This paper discusses a new attempt to evaluate B/A for water, utilizing the optical techniques and taking in account a correction for the nearfield of the transducer. Assumptions made for smoothness of the second harmonic nearfield and the accepted value of the piezooptic coefficient are discussed.
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