Object detecting switch device

Details Object detecting switch device Object detecting switch device

1991-04-16

1993-01-05

Swann, Tod R.

Communications, electrical: acoustic wave systems and devices

Echo systems

Distance or direction finding

367 99, 367135, 367901, 367903, G01S 1508

Patent

active

051777118

ABSTRACT:
This switch device for detecting an object comprises a transducer for emitting and receiving ultrasonic signals to and from an object, a transmitter for driving the transducer, a receiver for receiving a signal from the transducer, a gate for detecting a short-distant object, a gate for detecting a long-distant object, and a circuit for setting the timings of the gates in accordance with the detecting ranges of the object.
Another switch device is disclosed for detecting an object which comprises a transducer for emitting and receiving ultrasonic signals to and from an object, a transmitter for driving the transducer, a receiver for receiving a signal from the transducer, a suppression gate for preventing detection of a reflected ultrasonic pulse during the transducer residual vibration period, a detectable distance gate for determining the range of detectable distances, an amplitude comparator for preventing detection of reflected ultrasonic pulses having an amplitude below a threshold value, and a plurality of window pulses for enabling detection of a reflected ultrasonic pulses at various distances.

REFERENCES:
patent: 4169255 (1979-09-01), Hulsman et al.
patent: 4561064 (1985-12-01), Bruggen et al.
patent: 4606015 (1986-08-01), Yamaguchi
patent: 4785429 (1988-11-01), Folwell et al.
patent: 5008862 (1991-04-01), Shimamoto et al.

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