Measuring and testing – Vibration – By mechanical waves
Patent
1991-01-24
1992-11-03
Arana, Louis
Measuring and testing
Vibration
By mechanical waves
340901, G01N 2900, G08G 100
Patent
active
051598370
ABSTRACT:
An ultrasonic wave type obstacle sensor which comprises a first ultrasonic microphone for transmitting intermittently ultrasonic waves to a road surface obliquely and forwardly at predetermined timing, a second ultrasonic microphone for receiving the ultrasonic waves reflected from the road surface side, a comparator for providing an obstacle detecting signal when a signal from the second ultrasonic microphone exceeds a predetermined level of judgement, and an obstacle discriminating device for generating an obstacle discriminating signal when the pulse width of the obstacle discriminating signal is a predetermined width or larger.
REFERENCES:
patent: 4551722 (1985-11-01), Tsuda et al.
patent: 4561064 (1985-12-01), Bruggen et al.
patent: 4674073 (1987-06-01), Naruse
"A New Method of Object Recognition and Sensory Feedback Control by High Accuracy Ultrasonic Sensor", by Ken Sasaki et al., Journal of the Faculty of Engineering, Univ. of Tokyo, vol. 39, No. 3 (1988) pp. 209-240.
Arana Louis
Mitsubishi Denki K.K.
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