Microwave moisture/yield monitor with calibration on-the-go

Details Microwave moisture/yield monitor with calibration on-the-go Microwave moisture/yield monitor with calibration on-the-go

1996-11-05

1998-01-13

Regan, Maura K.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Distributive type parameters

324637, 324601, G01R 2704

Patent

active

057083665

ABSTRACT:
In a grain harvester having apparatus for measuring the moisture content of grain by directing a radio frequency signal along a measurement signal path through the grain and determining the moisture content from the phase shift and attenuation experienced by the measurement signal, calibration apparatus is provided for calibrating the moisture measurement apparatus without interrupting the grain harvesting operation. An attenuator, calibrated to a traceable standard, is selectively inserted into the measurement signal path to produce an expected attenuation of the measurement signal. The actual attenuation resulting from the insertion of the attenuator is compared with the expected attenuation and the difference is used to derive a control voltage for controlling the gain of the measurement signal path.

REFERENCES:
patent: 3644826 (1972-02-01), Cornetet, Jr.
patent: 5001434 (1991-03-01), Marrelli et al.
patent: 5103181 (1992-04-01), Gaisford
patent: 5576974 (1996-11-01), Marrelli et al.
patent: 5644244 (1997-07-01), Marrelli et al.
IEEE Transactions on Instrumentation and Measurement, vol. 41, No. 1, pp. 111-115, Feb. 1992.
Sensors, Sept. 1992, pp. 68-74.
Canadian Agricultural Engineering, vol. 34, No. 4, pp. 327-335 (Dec. 1992).

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