Distance Measuring Device and Method.
DEPARTMENT OF THE NAVY WASHINGTON D C
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The patent describes a distance measuring device using a source of acoustic signals of at least a predetermined wavelength which is transmitted to a reference surface and the reflected acoustic signal is received in a detector. The transmitted and received signals are phase-mixed in a mixer to provide a signal responsive to the distance between the distance measuring device and the reflecting surface irrespective of the presence of a non-rigid intervening media, such as foliage, which obstructs the desired reflecting surface. An envelope detector and a threshold device provide a utilization signal when the distance between the distance measuring device and the reflecting surface reaches a predetermined value.
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