CPC G01F 1/662 (2013.01) [G01F 1/667 (2013.01)] | 17 Claims |
1. A method of measuring time of flight, comprising:
correlating a signal comprising a reflected signal from a first transducer to a second transducer, or a subsequent reflected signal at the first transducer or the second transducer, with a previously received signal to produce a correlation for a measurement of a time of flight; and
measuring an absolute time of flight based on the correlation, wherein the absolute time of flight is proportional to a distance between the first transducer and the second transducer divided by a speed of sound or a speed of light.
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