Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters
Reexamination Certificate
2006-01-10
2006-01-10
Deb, Anjan (Department: 2858)
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Lumped type parameters
C324S236000, C324S207260
Reexamination Certificate
active
06984994
ABSTRACT:
A position and electromagnetic field sensor is provided. The sensor relies upon an oscillator such as a Robinson marginal oscillator to generate an rf or microwave electromagnetic field. As an inhomogeneously shaped object, such as a metallic toothed wheel, for example, moves through the resultant field, the field experiences a change in electric or magnetic susceptibility. This in turn causes energy losses in the oscillator the magnitude of which can be output as a d.c. signal related thereto. To detect non-moving objects which nevertheless generate an electromagnetic field or have attached to them a source thereof, the sensor also includes a giant or colossal magnetoresistive structure located adjacent the oscillator coil, the structure having an imaginary magnetic susceptibility which is strongly dependent upon the magnitude and direction of the field generated by or at the object to be sensed.
REFERENCES:
patent: 4112365 (1978-09-01), Larson et al.
patent: 4791355 (1988-12-01), Coulter et al.
patent: 4914610 (1990-04-01), Shimizu et al.
patent: 5065093 (1991-11-01), Nauta et al.
patent: 5166679 (1992-11-01), Vranish et al.
patent: 5670886 (1997-09-01), Wolff et al.
patent: 5834709 (1998-11-01), Blonder et al.
patent: 5841621 (1998-11-01), Dean et al.
patent: 6323641 (2001-11-01), Allwine
patent: 6593738 (2003-07-01), Kesil et al.
patent: 2003/0067310 (2003-04-01), Blank
patent: 0339983 (1989-11-01), None
patent: 0684454 (1994-05-01), None
patent: 0769699 (1997-04-01), None
patent: 1510034 (1978-05-01), None
patent: 1530358 (1978-10-01), None
patent: 2034479 (1980-06-01), None
patent: 2034483 (1980-06-01), None
patent: 2067295 (1981-07-01), None
patent: 2222257 (1990-02-01), None
patent: 2333845 (1999-08-01), None
patent: WO 2004/004113 (2004-01-01), None
Hahle-F, “Frequency-analogue strain measurement”, Radio-Fernsehen-Elektronik (East Germany), vol. 33, No. 4, p. 223-5, Apr. 1984. (abstract attached).
Hahnemann-H, “Capacitive volume measurement of conductive liquids”, Radio-Fernsehen-Elektronik (East Germany), vol. 34, No. 8, p. 493-5, Aug. 1985. (abstract attached).
Mutabzija-R, “Comparative analysis of two types of marginal oscillators as detectors”, Tehnika (Yugoslavia), vol. 41, No. 10, p. 1011-14, 1986. (abstract attached).
Dai-Ming-Yuan, “The Wien-Robinson oscillator for metering small variations in capacities” Elektronik (West Germany), vol. 37, No. 9, p. 86-9, Apr. 1988. (abstract attached).
UK Search Report GB 0006144.0, dated Jul. 8, 2000.
Deb Anjan
ISIS Innovation Limited
Wolf, Greennfield & Sacks, P.C.
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