Moisture measuring apparatus

Details Moisture measuring apparatus Moisture measuring apparatus

1979-07-26

1981-04-14

Christian, Leonard D.

Winding, tensioning, or guiding

Coil holder or support

Spool or core

242 96, 242100, 2421252, B65H 7528, B65H 7540, B65H 1904

Patent

active

042615259

ABSTRACT:
A moisture measuring apparatus includes a tuned circuit, a moisture sensor, coaxial cable means between the sensor and the tuned circuit wherein the tuned circuit tunes the coaxial cable, and a circuit for ascertaining the loading presented by the sensor to the tuned circuit whereby moisture is measured. The sensor is alternately connected and disconnected to an end of the coaxial cable and the signal drive across the tuned circuit is standardized, when the sensor is disconnected, for zeroing the instrument. Also, the gain of the circuitry is adjusted by periodically providing a standard load to the tuned circuit while adjusting amplification to bring about a standard output. The apparatus is not as sensitive to cable changes as prior apparatus and a plurality of selectable coaxial cables are provided on reels adjacent the sensor console.

REFERENCES:
patent: 929889 (1909-08-01), Snyder
patent: 1130591 (1915-03-01), Gray
patent: 1920843 (1933-08-01), Counihan
patent: 3051446 (1962-08-01), Nelson et al.
patent: 3983977 (1976-10-01), Crabb
patent: 4165633 (1979-08-01), Raisanen

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