Apparatus and method for marker verification

Details Apparatus and method for marker verification Apparatus and method for marker verification

1985-02-11

1987-06-23

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

With particular system function

340551, 34082534, 235380, G08B 2600, G06K 500

Patent

active

046756558

ABSTRACT:
A unit and method are provided for the short range scanning of magnetic markers. The scanning unit includes an antenna adapted to provide a narrow interrogation field of short overall range. Control circuitry is provided for establishing the applied magnetic interrogation field and detecting and processing the response signal of the marker. A light emitting diode then provides a signal to the operator indicating whether a response signal is received from the marker being interrogated. The scanning unit is also equipped with a ferromagnetic plate of high magnetic coercivity for producing a dc bias field and activating the marker.

REFERENCES:
patent: 3790945 (1974-02-01), Fearon
patent: 3836842 (1974-09-01), Zimmermann et al.
patent: 4510489 (1985-04-01), Anderson, III et al.
patent: 4510490 (1985-04-01), Anderson, III et al.

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