Raindrop sensor

Details Raindrop sensor Raindrop sensor

1990-10-26

1993-04-20

Razavi, Michael T.

Measuring and testing

Meteorology

Precipitation

340602, G01N 114, G08B 2100

Patent

active

052032078

ABSTRACT:
A raindrop sensor attached to a plate such as a windshield of a car. A first piezoelectric element as an ultrasonic generator is fitted to the plate via a first coupler. The coupler fixes the first element in an inclined state by a predetermined angle relative to the plate. Thereby, elastic waves or ultrasonic waves from the first element are transmitted while being repeatedly reflected in the plate. A second piezoelectric element as an electro-acoustic transducer is fitted to the plate via a second coupler. The second element detects amplitude of the ultrasonic waves transmitted in the plate.

REFERENCES:
patent: 4461178 (1984-07-01), Chamuel
patent: 4604612 (1986-08-01), Watkins et al.
patent: 4652745 (1987-03-01), Zanardelli

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