G - Physics – 01 – F
Patent
G - Physics
01
F
340/140.1
G01F 23/26 (2006.01)
Patent
CA 1129033
DETECTOR CIRCUIT ABSTRACT OF THE DISCLOSURE Disclosed are apparatus and methods for detecting the presence, or absence, of material at a predetermined location. An oscillator generates a constant-frequency, constant-amplitude signal which is fed through a load resistor to an antenna probe positioned at the sensing location. The amplitude of the signal fed to the antenna probe varies as the impedance of the antenna probe is affected by material in its environment, or lack thereof. The signal amplitude is converted into a d-c voltage level, and is transmitted to a switching circuit which provides an output signal depending on a comparison between the d-c voltage level and a reference voltage level. The sensitivity of the switching circuit is adjustable to accommodate the degree to which the particular material, whose presence or absence is to be detected, affects the impedance of the antenna probe. In a method of the invention, a constant-amplitude signal is fed to an impedance bridge which includes an antenna probe whose impedance is affected by its environment. The resulting amplitude-modulated signal is used to generate a d-c voltage level reflecting the impedance changes. The voltage level is used to control a switching circuit. The switching circuit is provided with a sensitivity adjustment whereby the sensitivity of the switching circuit response is varied to reflect the degree of impedance change that may be effected by the particular change in environment, of the antenna probe, to be detected. The output from the switching circuit may be used to operate one or more devices indicative of the environment of the antenna probe and/or affecting the environment by adding to and/or removing therefrom material affecting the impedance of the antenna probe.
302057
Keystone International Inc.
Kirby Eades Gale Baker
LandOfFree
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