A New Method for the Visualization and Measurement of Ultrasonic Fields

A new method for the observation of ultrasonic field distributions described, utilizing a starch plate in a dilute solution of iodine in a manner analogous to the use of photographic emulsions. Near‐field diffraction patterns are shown as illustrative of results, which appear to be superior to those of other methods, and the advantages of the new method over previous techniques are described.