Ultrasonic device in particular for detecting the presence of fo

Details Ultrasonic device in particular for detecting the presence of fo Ultrasonic device in particular for detecting the presence of fo

1997-05-08

1998-10-06

Lefkowitz, Edward

Communications: electrical

Condition responsive indicating system

Specific condition

367 93, 367140, 318483, G08B 2100

Patent

active

058183418

ABSTRACT:
The invention concerns an ultrasonic detection device intended to detect the presence of foreign bodies, on the surface of a window comprising a first sheet having a first thickness, comprising a transducer co-operating with a first face of said first sheet, said transducer being able to emit an ultrasonic signal of frequency f.sub.t and also able to receive a reflected ultrasonic signal on a second face of the first sheet, the variation in said reflected signal being representative of the presence or absence of foreign bodies on said second face facing said transducer. This device is characterized in that the frequency f.sub.t is selected to satisfy the following equation:

REFERENCES:
patent: 5203207 (1993-04-01), Sugiyama
patent: 5432415 (1995-07-01), Ittah et al.
patent: 5436060 (1995-07-01), Saurer et al.
patent: 5598380 (1997-01-01), Saurer et al.

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