Electricity: measuring and testing – Testing potential in specific environment
Reexamination Certificate
2006-09-19
2006-09-19
Deb, Anjan (Department: 2858)
Electricity: measuring and testing
Testing potential in specific environment
C324S458000
Reexamination Certificate
active
07109698
ABSTRACT:
An electric-field meter provided with a housing, an electrode assembly, a shield assembly, a movement assembly, a position detection assembly, a charge measurement circuit, and a leakage current compensation circuit. The electric-field meter can be characterized as a field mill, an induction voltmeter, an electrostatic fluxmeter or an agrimeter. The electrode assembly is selectively exposed to the electric field. The shield assembly alternately covers and exposes the electrode assembly to the electric field. The movement assembly has a source of motive force and a linkage operably connected to one of the shield assembly and the electrode assembly for alternately covering and exposing the electrode assembly to the electric field. The charge measurement circuit receives charge on the electrode assembly. The charge measurement circuit provides a charge detection signal indicative of the charge induced on the electrode assembly as the electrode assembly is selectively exposed to the electric field. A current compensation circuit is provided for offsetting an average leakage current at the input of the charge measurement circuit.
REFERENCES:
patent: 1919215 (1933-07-01), Gunn
patent: 2449068 (1948-09-01), Gunn
patent: 2587156 (1952-02-01), Havenhill et al.
patent: 2815483 (1957-12-01), Kaufman
patent: 2820947 (1958-01-01), Gunn
patent: 3121196 (1964-02-01), Kasemir
patent: 3188472 (1965-06-01), Whipple, Jr.
patent: 3273066 (1966-09-01), Ruhnke
patent: 3344344 (1967-09-01), Wales, Jr.
patent: 3370225 (1968-02-01), Winder
patent: 3449668 (1969-06-01), Blackwell, et al.
patent: 3458805 (1969-07-01), Kasemir
patent: 3519927 (1970-07-01), Holt
patent: 3564529 (1971-02-01), Kaufman et al.
patent: 3586973 (1971-06-01), Lawton et al.
patent: 3611127 (1971-10-01), Vosteen
patent: 3662250 (1972-05-01), Thomas et al.
patent: 3727125 (1973-04-01), Mourier
patent: 3812419 (1974-05-01), Kaunzinger et al.
patent: 3820095 (1974-06-01), Wojtasinski et al.
patent: 3824454 (1974-07-01), Stern et al.
patent: 3846700 (1974-11-01), Sasaki et al.
patent: 3868074 (1975-02-01), Hill
patent: 3916605 (1975-11-01), Richards et al.
patent: 3917996 (1975-11-01), Wagner et al.
patent: 3919636 (1975-11-01), Few
patent: 3921087 (1975-11-01), Vosteen
patent: 3925726 (1975-12-01), Few
patent: 3935532 (1976-01-01), Shuey et al.
patent: 4054835 (1977-10-01), Los et al.
patent: 4055798 (1977-10-01), Kato
patent: 4095221 (1978-06-01), Slocum, Jr.
patent: 4101825 (1978-07-01), Truax
patent: 4199715 (1980-04-01), Hill
patent: 4277745 (1981-07-01), Deno
patent: 4330749 (1982-05-01), Eda et al.
patent: 4370616 (1983-01-01), Williams
patent: 4422037 (1983-12-01), Coleman
patent: 4424481 (1984-01-01), Laroche et al.
patent: 4433297 (1984-02-01), Buchheit
patent: 4506211 (1985-03-01), Coleman
patent: 4553099 (1985-11-01), Kasahara et al.
patent: 4642559 (1987-02-01), Slough
patent: 4672305 (1987-06-01), Coleman
patent: 4683436 (1987-07-01), Suzuki
patent: 4803421 (1989-02-01), Ostrander
patent: 4836581 (1989-06-01), Peterson, Jr.
patent: 5065102 (1991-11-01), Takanashi et al.
patent: 5315232 (1994-05-01), Stewart
patent: 6353324 (2002-03-01), Uber et al.
patent: 6608483 (2003-08-01), Hill
patent: 6956417 (2005-10-01), Bernstein et al.
patent: 2003/0030446 (2003-02-01), Wang et al.
Wilson, C.T.R.; On a Portable Gold-leaf Electrometer for Low or High Potentials; Cambridge Philosophical Society; Jan. 31, 1906; pp. 184-189; vol. XIII, Part IV; Cambridge University Press.
Wilson, C.T.R.; On the Measurement of the Earth-Air Current and on the Origin of Atmospheric Electricity; Cambridge Philosophical Society; Nov. 5, 1906; pp. 363-382; vol. XIII, Part VI; Cambridge University Press.
Simpson, George C.; Earth-Air Electric Currents; The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science; May 1910; pp. 715-725; Sixth Series.
Wilson, C.T.R.; On Some Determinations of the Sign and Magnitude of Electric Discharges in Lightning Flashes; Proceedings of the Royal Society; Mathematical and Physical Sciences; Jun. 3, 1916; pp. 555-574; Ser. A, vol. 92, No. A 644.
Wilson, C.T.R.; Investigations of Lightning Discharges and on the Electric Field of Thunderstorms; Aug. 27, 1920; pp. 73-115; Philosophical Transactions of the Royal Society of London; Ser. A, vol. 221.
Whipple, F.J.W.; On the Association of the Diurnal Variation of Electric Potential Gradient in Fine Weather with the Distribution of Thunderstorms Over the Globe; Quarterly Journal of the Royal Meteorological Society; Jan. 1929; pp. 1-15; vol. 55, No. 229.
Whipple, F.J.W.; Potential Gradient and Atmospheric Pollution: The Influence of “Summer Time”; Aug. 6, 1929; pp. 351-362.
Wilson, C.T.R.; Some Thundercloud Problems; Journal of the Franklin Institute; Jul. 1929; pp. 1-12; vol. 208, No. 1; Lancaster Press, Inc.
Kirkpatrick, Paul and Miyake, Iwao; A Generating Voltmeter for the Measurement of High Potentials; The Review of Scientific Instruments; Jan. 1932; pp. 1-8; vol. 3, No. 1.
Kirkpatrick, Paul; Further Development of the Rotary Voltmeter; Apr. 4, 1932; pp. 430-438.
Gunn, Ross; Principles of a New Portable Electrometer; Apr. 15, 1932; pp. 307-313; vol. 40.
Harnwell, G.P. and Van Voorhis, S.N.; An Electrostatic Generating Voltmeter; R.S.I.; Oct. 1933; pp. 540-541.
Henderson, Joseph E., Goss, Wilbur H., Rose, John E.; The Use of the Rotary Voltmeter for Measurements up to 830 kilovolts; R.S.I.; Mar. 1935; pp. 63-65; vol. 6.
Gunn, Ross; The Electricity of Rain and Thunderstorms; Terrestial Magnetism & Atmospheric Electricity; 1935; pp. 79-106; vol. 40, No. 1.
Van Atta, L.C., Northrup, D.L., Van Atta, C.M. and Van De Graaff, R.J.; The Design, Operation, and Performance of the Round Hill Electrostatic Generator; Physical Review; May 15, 1936; pp. 761-776; vol. 49.
Macky, W.A.; The Measurement of Normal Atmospheric-Electric Potential-Gradients Using a Valve-Electrometer; Terrestrial Magnetism and Atmospheric Electricity; Mar. 1937; pp. 77-86; vol. 42, No. 1.
Workman, E.J. and Holzer, R.E.; A Recording Generating Voltmeter for the Study of Atmospheric Electricity; R.S.I.; May 1939; pp. 160-163; vol. 10.
Gunn, Ross; The Electrical Charge on Precipitation at Various Altitudes and its Relation to Thunderstorms; Physical Review; Feb. 1, 1947; pp. 181-186; vol. 71, No. 3.
Waddel, R.C.; An Electric Field Meter for Use on Airplanes; The Review of Scientific Instruments; Jan. 1948; pp. 31-35; vol. 19, No. 1.
Simpson, G.C.; Atmospheric Electricity During Disturbed Weather; Terrestrial Magnetism and Atmospheric Electricity; Mar. 1948; pp. 27-33; vol. 53, No. 1.
Malan, D.J., and Schonland, B.F.J.; An Electrostatic Fluxmeter of Short Response-time for use in Studies of Transient Field-Changes; The Proceedings of The Physical Society, Section B; Jun. 1, 1950; pp. 402-408; vol. 63, Part 6, No. 366B.
Chalmers, J. Alan; Negative Electric Field in Mist and Fog; Journal of Atmospheric and Terrestrial Physics; 1952; pp. 155-159; vol. 2; Pergamon Press Ltd., London.
Cross, A.S.; Two Electrostatic Field-Meters; British Journal of Applied Physics; Mar. 1953; pp. S 47-S 50; Supplement No. 2.
Chalmers, J. Alan; The Agrimeter for Continuous Recording of the Atmospheric Electric Field; Journal of Atmospheric and Terrestrial Physics; 1953; pp. 124-128; vol. 4; Pergamon Press Ltd., London.
Smith, L.G.; An Electric Field Meter with Extended Frequency Range; The Review of Scientific Instruments; May 1954; pp. 510-513; vol. 25, No. 5.
Mapleson, W.W. and Whitlock, W.S.; Apparatus for the Accurate and Continuous Measurement of the Earth's Electric Field; Journal of Atmospheric and Terrestrial Physics; 1955; pp. 61-72; vol. 7; Pergamon Press Ltd., London.
Whitlock, W.S. and Chalmers, J. Alan; Short-Period Variations in the Atmospheric Electric Potential Gradient; 1956; pp. 325-336.
Clark, John F.; Airborne Measurement of Atmospheric Potential Gradient; Journal of Geophysical Research; Dec. 1957; pp. 617-628; vol. 62, No. 4.
Jones, O.C., Maddever, R.S. and Sanders, J.H.; Radiosonde Measurement of Vertical Electrical Field and Polar Conductivity; Journal of Scientific Instruments
Beasley William H.
Bogoev Ivan G.
Byerley Leon G.
Swenson Jody A.
Deb Anjan
Dunlap Codding & Rogers P.C.
The Board of Regents University of Oklahoma
LandOfFree
Electric-field meter having current compensation does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Electric-field meter having current compensation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electric-field meter having current compensation will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3572109