Resonant sensor system and method

Details Resonant sensor system and method Resonant sensor system and method

1995-06-06

1999-08-24

Horabik, Michael

Communications: electrical

Continuously variable indicating

Condition responsive

340505, 34087031, 34082554, 324337, G08B 2100

Patent

active

059429917

ABSTRACT:
Apparatus, and related method, for remotely measuring at 1east one environmental condition includes an electromagnetically resonant sensor having a measurable resonance characteristic (e.g., center resonance frequency, quality factor, or bandwidth) that varies in correspondence to changes in the environmental condition present at the sensor. The sensor emits an electromagnetic return signal representative of a state of the resonance characteristic when an electromagnetic excitation signal impinges on the sensor. The electromagnetic excitation signal is generated by a generator located separate and away from the sensor, and the excitation signal is then directed at the remote sensor. The sensor thus remotely detects and measures the environmental condition. In one embodiment, the sensor is an electromagnetically resonant electrical circuit. In another embodiment, the sensor is an antenna resonator (e.g., a half-wavelength antenna) made of a conductive material.

REFERENCES:
patent: 3656132 (1972-04-01), Brumbelow
patent: 4160971 (1979-07-01), Jones et al.
patent: 4862088 (1989-08-01), Etienne et al.
patent: 5287059 (1994-02-01), Ando et al.

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