G - Physics – 01 – F
Patent
G - Physics
01
F
340/140.1
G01F 23/26 (2006.01)
Patent
CA 1115806
AMPLITUDE RESPONSIVE DETECTOR ABSTRACT OF THE DISCLOSURE Disclosed are apparatus and methods for detecting the presence, or absence, of material at a predetermined location. A crystal controlled oscillator generates a constant-frequency, constant-amplitude signal which is fed through a load resistor to an antenna sensor circuit, in- cluding an antenna probe positioned at the sensing location. The amplitude of the signal fed to the sensor circuit varies as the impedence of the antenna probe is affected by material in its environment, or the lack thereof. The signal amplitude is converted to a d-c voltage level, which is added to a reference d-c voltage level preset with the antenna probe free of impedance-affecting material. The difference signal resulting from this comparison is fed to a switching circuit which provides an output signal depending on a comparison between the difference signal and a reference voltage level. A feedback loop in the switching circuit provides a hysteresis effect. In the 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 amplitude of the signal, thus altered according to the en- vironment of the antenna probe, is used to generate a d-c voltage level reflecting these amplitude changes, and which is added to a voltage reference level. The difference voltage level value thus obtained, and which reflects the environment of the antenna probe, is used to control a switching circuit whose output assumes one value or another, depending ultimately on the antenna probe's environment. The output from the switching circuit may be used to operate one or more devices indicating 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.
302014
Keystone International Inc.
Kirby Eades Gale Baker
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