Moisture sensor with pre-demodulation gain and high-order filter

Details Moisture sensor with pre-demodulation gain and high-order filter Moisture sensor with pre-demodulation gain and high-order filter

1999-05-25

2000-09-26

Masih, Karen

Electricity: motive power systems

Automatic and/or with time-delay means

Moisture content or wetness

318444, 318480, 318DIG2, 15250C, 1525012, 1525016, 1525017, G05B 500

Patent

active

061246913

ABSTRACT:
A moisture sensor for detecting moisture on the surface of a transparent material. The moisture sensor includes one or more emitters for producing moisture sensing signals which are influenced by moisture on the transparent material, and one or more detectors for receiving the moisture sensing signals and producing a detector output signal. The moisture sensor further includes a pre-demodulation gain and filtering circuit having high order filtering for removing most of the unwanted ambient light noise and EMI interference from the detector output signal for the accurate detection of moisture in the presence of noise.

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