Measuring and testing – Vibration – By mechanical waves
Patent
1996-03-13
1998-01-06
Williams, Hezron E.
Measuring and testing
Vibration
By mechanical waves
73 6453, 73597, 73620, 73627, 7386424, 7386425, 222420, 422100, 422 681, G01N 2900, B01L 302
Patent
active
057057508
ABSTRACT:
An ultrasonic sensor detects the time of rise of the first of transmitted waves and also detects peak points Po appearing in the waveform of received waves to detect a waveform reference point where the time-base coordinate of a phantom envelope connecting these peak points Po is a minimum. The time T2 of rise of the first of the received waves is calculated by adding a predetermined period of offset time To to the time t2 of the waveform reference point of the received waves to calculate the elapsed time .DELTA.T from the time of rise of the first transmitted wave to the time of rise of the first received wave. The distance L to an object of measurement is calculated based on the result of calculation. The distance L to the object can be calculated alternatively based on the elapsed time .DELTA.T' from a waveform reference point of the transmitted waves to the waveform reference point of the received waves. The sensor thus realized gives measurements with high accuracy even with use of ultrasonic waves of relatively low frequency.
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Arakawa Hiroaki
Hojo Mikio
Matsuhashi Toshihiko
Mizukami Kazuaki
Ogawa Atsushi
Moller Richard A.
Sanyo Electric Co,. Ltd.
Williams Hezron E.
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