Ultrasonic object detecting apparatus

Details Ultrasonic object detecting apparatus Ultrasonic object detecting apparatus

1991-06-19

1993-07-27

Mullen, Thomas

Communications, electrical: acoustic wave systems and devices

Echo systems

Presence or movement only detection

340511, G01S 1500

Patent

active

052316084

ABSTRACT:
In an ultrasonic object detecting apparatus which detects the presence of an object by emitting ultrasonic tone bursts and by receiving the reflected wave, an attenuator is provided at the rear stage of a reception and amplification circuit and an attenuation control circuit for controlling the attenuation in the attenuation circuit is added so that the attenuation is increased at a timing when a reflected wave from a short distance object is received and the attenuation is decreased at a timing when a reflected wave from a long distance object is received. An object in a wide range from the short distance to the long distance may be thus stably detected.

REFERENCES:
patent: 3740704 (1973-06-01), Suter
patent: 4337527 (1982-06-01), Delagrange et al.
patent: 4542489 (1985-09-01), Naruse
patent: 4852576 (1989-08-01), Inbar et al.
patent: 5047752 (1991-09-01), Schorn

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