IEEE Transactions on Instrumentation and Measurement · 1993 · 47 citations · 11 references
EngineeringMeasurementUltrasonic SensorsEducationAcoustic SensorEngineering AcousticCalibrationEnvelope ZeroSystems EngineeringInstrumentationAcoustic Signal ProcessingTime-of-flight ImagingTime-of-flight CameraUltrasonicsAircraft NavigationAcoustic PropagationUltrasoundSignal ProcessingAcoustic TransducerAerospace EngineeringDigital Measurement
Most ultrasonic distance measurements are based on the determination of the time of flight. This paper presents a novel way for the measurement of the time of flight, based on the detection of the envelope zero in an ultrasonic wave. A particular wave form is produced by supplying two pulse trains subsequently to an acoustic transducer. Distance information is retrieved from the zero, so a fully digital measurement is possible, reducing signal-processing time and resulting in a fast and accurate distance measurement.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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