Method for acoustic signal detection

Details Method for acoustic signal detection Method for acoustic signal detection

G - Physics

01

V

349/7

G01V 1/28 (2006.01) G01V 1/50 (2006.01)

Patent

CA 1116737

ABSTRACT OF THE DISCLOSURE Method and apparatus for detection of acoustic signals whereby errors due to "noise", "waveform stretch" and "cycle skipping" may be minimized. Detection of corresponding sequential half-cycle arrivals of each acoustic signal wave from transmitter at two spaced receivers activates zero crossing detectors to provide times of zero crossings A' and A in first half-cycles of waves from respective receivers and of corresponding zero crossings B' and B of succeeding half-cycles of waves from respective receivers. Difference of A'-A is used as most accurate indication of travel time if proved valid by tests such as evaluation against a predetermined reference time. Otherwise difference of B'-B may be used instead. Alternatively, B'-B may be subjected to similar tests for validity before using and, if found invalid, discarded in favor of the last previously used or recorded valid time difference. -1-

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