Patent ID: 8427176

Claim:
A low power measurement system for measuring a parameter comprising: a medium where the parameter to be measured affects the medium; a first transducer coupled to the medium at a first location where the first transducer emits a pulsed energy wave into the medium in response to a pulse; a second transducer coupled to the medium at a second location where the pulsed energy wave propagates through the medium to the second location and where the second transducer generates a signal in response to the pulsed energy wave; and a pulsed system including: an edge detect circuit for detecting an edge of the signal from the second transducer; and a first pulse circuit for generating a pulse to initiate a subsequent measurement sequence in response to a detected edge by the edge detect circuit where a transit time of the pulsed energy wave propagating from the first location to the second location is measured and the transit time or change in transit time corresponds to the parameter where the system includes an amplifier having an input coupled to an output of the edge detect circuit and an output coupled to the first transducer.