Data processing: measuring – calibrating – or testing – Measurement system in a specific environment – Electrical signal parameter measurement system
Reexamination Certificate
2007-04-10
2007-04-10
Barlow, John (Department: 2863)
Data processing: measuring, calibrating, or testing
Measurement system in a specific environment
Electrical signal parameter measurement system
C361S155000
Reexamination Certificate
active
11096723
ABSTRACT:
When a sine wave is supplied from a sine wave oscillator through a resonant capacitor selection circuit, an alternating electric and magnetic field is generated on a loop coil. A magnetic intensity detection coil supplies an electromagnetic field signal to a control circuit when detecting electromagnetic intensity of the loop coil. The control circuit controls the resonant capacitor selection circuit based on the electromagnetic field signal and adjusts a maximum current to flow into the loop coil. Namely, a resonant capacitor with a suitable capacitance is selected in such a way that a resonance point (for example, 125 kHz) reaches a maximum level. Moreover, the control circuit adjusts a variable resistor to obtain a target electromagnetic field signal (intensity of electromagnetic field) in this state. Namely, automatic gain control is performed to obtain optimal electromagnetic field intensity on the loop coil.
REFERENCES:
patent: 4300183 (1981-11-01), Richardson
patent: 4328525 (1982-05-01), Allen et al.
patent: 6720771 (2004-04-01), Gupta et al.
patent: 7005935 (2006-02-01), Moore
patent: 08-221627 (1996-08-01), None
patent: 08221628 (1996-08-01), None
Barlow John
Le Toan M.
Seiko Precision Inc.
Townsend and Townsend / and Crew LLP
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