Electricity: measuring and testing – Conductor identification or location – Inaccessible
Patent
1982-04-14
1984-08-28
Krawczewicz, Stanley T.
Electricity: measuring and testing
Conductor identification or location
Inaccessible
G01R 2726
Patent
active
044686102
ABSTRACT:
Apparatus for measuring moisture content of gypsum board and like products as a function of dielectric constant comprising an rf signal source, an antenna disposed for rf field coupling to a test material, first and second reference inpedances, and a control circuit for selectively connecting the reference and antenna impedances to the output of the rf source. A rectifier is responsive to source output for providing the corresponding d.c. signal to measurement electronics. The measurement electronics first subtract a first reference signal indicative of the reference impedances from both a differing second reference signal indicative of the reference impedances and from a signal indicative of impedance at the antenna. Moisture content is then determined as a function of the ratio of the differences. A threshold detector is responsive to the difference between the antenna and reference signals for indicating the presence of test material adjacent the antenna.
REFERENCES:
patent: 3209247 (1965-09-01), Mead et al.
patent: 3443219 (1969-05-01), Adams
patent: 3523243 (1970-08-01), Wagner
patent: 3723865 (1973-03-01), Batey et al.
Krawczewicz Stanley T.
Penril Corp.
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