Abstract
A method is described for measuring and recording the speed of a rapidly changing blast of air. The method depends on the change in phase of an acoustic signal received at a point, the phase shift being a function of the velocity of the air between the sound transmitter and receiver. Tested in a laboratory gallery with a series of steady air blasts ranging from 25 to 125 ft./sec., the method gave results closely corresponding with the air velocities measured by an independently calibrated orificemeter. It is capable of rapid response and of dealing with a wide range of air speeds. It is proposed to employ the method to record the changing speed of the air blast which precedes the flame of an explosion travelling along a gallery.
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