US 6,981,405 B2
Moisture-detection device
Willi Wimmer, Hauzenberg (Germany)
Assigned to Vogt Electronic AG, Obernzell (Germany)
Filed on Jun. 07, 2002, as Appl. No. 10/163,503.
Claims priority of application No. 101 27 990 (DE), filed on Jun. 08, 2001.
Prior Publication US 2002/0189329 A1, Dec. 19, 2002
Int. Cl. G01N 5/02 (2006.01); G01N 25/56 (2006.01)
U.S. Cl. 73—74 19 Claims
OG exemplary drawing
 
1. A device for determining moisture, said device including an LC-oscillating circuit as a first transducer and a second LC-oscillating circuit as a second transducer;
an oscillator for exciting the first and second LC-oscillating circuits;
a tuning circuit for sweep-wise tuning the frequency of the oscillator; and
a measuring and evaluation circuit for recording a dampening or attenuation condition of the first LC-oscillator and for providing a signal that is dependent on an amount of moisture at or surrounding the first transducer;
wherein the first and second transducers are coupled to the oscillator by a contact-free energy coupling.