Abstract
An optical method for measurement of the sound pressure amplitude in the standing-wave field of an ultrasonic hydrogen bubble chamber is described. Although this method gives only an average value of the sound pressure amplitude along the light path in the liquid, the amplitude at the center part in the standing-wave field can be estimated by measuring the lateral distribution of the average value. In this experiment, such a lateral distribution has been measured in the liquid of CCl 4, in which the sound velocity is almost the same as that in liquid hydrogen, and the ratio of the sound pressure amplitude at the center part to the average value along the light path has been obtained. Assuming that the ratio is applicable to an ultrasonic hydrogen bubble chamber having the same geometrical conditions as in experiment for CCl 4, the sound pressure amplitude at the center part is determined.
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