Water drop detector or transparent substrate and initiating meth

Details Water drop detector or transparent substrate and initiating meth Water drop detector or transparent substrate and initiating meth

1998-07-22

2000-08-01

Sircus, Brian

Electricity: motive power systems

Automatic and/or with time-delay means

Moisture content or wetness

318480, G05B 500

Patent

active

060971673

ABSTRACT:
A water drop detection device for detecting an amount of water drops present upon a surface of a transparent substrate in which a light source with a driver circuit guides light into the substrate so as to cause the light to under go internal reflection within the substrate. The light source has a light emitting element and a receiving light sensing element for detecting the light output from the emitting element. The light outputted from the light emitting element is modulated by a predetermined frequency. A signal corresponding to the modulated component is separated from the output signal of the receiving light sensing element. The output light emission of the light emitting element is controlled as a desired value by feeding the separated signal back to the driver circuit of the light emitting element.

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