Reflective wetness detector

Details Reflective wetness detector Reflective wetness detector

1996-05-13

1998-01-13

Le, Que

Radiant energy

Photocells; circuits and apparatus

With circuit for evaluating a web, strand, strip, or sheet

250214A, G01N 2186

Patent

active

057082782

ABSTRACT:
A reflective wetting or spot detecting system incorporates a light emitting diode and a solid state photo sensor arranged on the same side of a medium being analyzed. The sensor is carried at one end of an elongated housing with a linear channel extending through. The channel is oriented on a line that is normal to the medium being analyzed. The channel functions as a lensless, passive focuser of reflected radiant energy. The source of radiant energy is located at an acute angle with respect to the medium. A conditioning circuit is coupled to the output of the sensor. The conditioning circuitry includes a current-to-voltage converter, a signal reducing stage, an amplifying stage and a comparator. The signal reducing stage reduces the voltage signal, produced by the current voltage converter, a predetermined amount, thereby effectively providing the amplifier stage with a greater dynamic range than it would have otherwise had. The output from the amplifier stage charges a capacitor with first and second different time constants depending on whether a medium to be analyzed is present or not. Output from the comparator circuitry drives output amplifiers to provide a digital signal indicative of a wetting or spotting event.

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