Passive transmitting sensor

Communications: directive radio wave systems and devices (e.g. – Radar transponder system – Radar transponder only

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Details

342 44, G01S 1380

Patent

active

052277984

ABSTRACT:
The disclosed system comprises a receiver that is inductively coupled to one or more passive transmitters by means of a receiving inductor. The receiver comprises a sweep signal source which is coupled equally to the receiving inductor and a reference inductor. The receiving inductor is coupled to a passive transmitter which includes an L-R-C circuit comprised of a transmitting inductor, a temperature-dependent capacitor, and a resistor that may be variable or fixed, depending upon the application. As the sweep signal source passes through the resonant frequency of the passive transmitter, the passive transmitter forms a low impedance load magnetically coupled to the receiving inductor by means of the near or induction electromagnetic field produced by the inductor. Changes in the resonant frequency are used to determine temperature variation. Changes in the peak voltages are a determinant of resistor variation resulting from changes in pressure or strain, or they are a determinant of changes in proximity of the passive transmitter to the receiver, or the resistor variation resulting from changes in pressure or strain.

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Warnagiris, Thomas J., "Induction Field Pssive Transmitter", dated Apr. 4, 1990.
Swinyard, W. O., "Measurement of Loop-Antenna Receivers", Proceedings of the I.R.E., Jul. 1941, pp. 382-387.
Przedpelski, Andrzej B., "Near Field" Communication, R & D Laboratory, A.F.R. Products, Inc. Boulder, CO 80301, Mar./Apr.

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