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Class Information
Number: 324/234
Name: Electricity: measuring and testing > Magnetic > With means to create magnetic field to test material > Electrically energized nonforce type sensor
Description: Subject matter wherein the apparatus to sense and indicate the sensing of the magnetic field modified by the material includes a sensor which requires an electrical current to pass therethrough, and which senses and indicates the magnetic field other than by a force measurement.

Sub-classes under this class:

Class Number Class Name Patents
324/238 Material flaw testing 300
324/235 Noncoil type 241
324/236 Oscillator type 269

Patents under this class:
1 2 3 4

Patent Number Title Of Patent Date Issued
5045786 Circuit for measuring a variable inductance connected in series with a fixed inductance Sep. 3, 1991
5028870 Sensor system method and apparatus for discrimination of metallic objects based on a variation in self inductance Jul. 2, 1991
5021738 Field variable, electronically controlled, nested coil eddy current probe Jun. 4, 1991
5017869 Swept frequency eddy current system for measuring coating thickness May. 21, 1991
5010298 Variable inductance displacement measuring device with slidable metal sleeve and ferrite bead core Apr. 23, 1991
5003262 Eddy current system with interference signal rejection Mar. 26, 1991
4983914 Proximity measurement by inductive sensing using single turn UHF energized coil sensors incorporated into cutter head of sheep shearing device Jan. 8, 1991
4963118 Method and apparatus for coin sorting and counting Oct. 16, 1990
4947117 Nondestructive detection of an undesirable metallic phase, T.sub.1, during processing of aluminum-lithium alloys Aug. 7, 1990
4943771 Differential eddy current sensor measuring apparatus for use with movable mirror segments Jul. 24, 1990
4926123 Precision variable pitch compensation winding for displacement transducer May. 15, 1990
4906925 Apparatus for detecting conductive materials in a moving flow Mar. 6, 1990
4893079 Method and apparatus for correcting eddy current signal voltage for temperature effects Jan. 9, 1990
4891591 Nonintrusive method and apparatus for monitoring the cure of polymeric materials Jan. 2, 1990
4883264 Bill disbursing system Nov. 28, 1989
4878019 Electrical sensing system for measuring ferrous particles within a fluid with temperature compensation circuit Oct. 31, 1989
4875567 Coin validation device Oct. 24, 1989
4864236 Wire inhomogeneity detector having a core with opposing pole pieces and guide pieces adjacent the opposing pole pieces Sep. 5, 1989
4845429 Inductance divider sensor Jul. 4, 1989
4843259 Process for the non-contacting detection of eddy current-induced bodies, particularly metal objects, as well as to sensors based on the process Jun. 27, 1989
4837509 Method and apparatus for measuring diameter of a steel reinforcement rod embedded in concrete and the thickness of the concrete overlayer Jun. 6, 1989
4835471 Measuring device with oscillation circuit including an exciting coil and tuned to a specific resonant frequency, for determining content of magnetizable substances in materials May. 30, 1989
4764725 Apparatus for detecting counterfeit currency using two coils to produce a saturating magnetic field Aug. 16, 1988
4746858 Non destructive testing for creep damage of a ferromagnetic workpiece May. 24, 1988
4731578 Electrical sensing system for measuring ferrous particles within a fluid Mar. 15, 1988
4719422 Eddy-current probes especially for the scanning of non-flat profiled surfaces Jan. 12, 1988
4667158 Linear position transducer and signal processor May. 19, 1987
4629984 Ferromagnetic eddy current probe apparatus Dec. 16, 1986
4603295 Two-headed DC magnetic target proximity sensor Jul. 29, 1986
4593244 Determination of the thickness of a coating on a highly elongated article Jun. 3, 1986
4584529 Method and apparatus for discriminating between genuine and suspect paper money Apr. 22, 1986
4580097 Electronic proximity sensor which is responsive to induced resistance Apr. 1, 1986
4580096 Isotachophoresis analyzer for inductively detecting boundaries between adjoining substances having different conductivities Apr. 1, 1986
4555664 Process and device for inspecting a surface in simulated manner which differs from the real surface scanning by an eddy current transducer Nov. 26, 1985
4502006 Displacement measuring transducers and their use for sensing vehicle suspension displacements Feb. 26, 1985
4488113 Magnetic bridge proximity sensor Dec. 11, 1984
4485344 Apparatus for electromagnetically measuring the ovalization of a ferromagnetic pipe Nov. 27, 1984
4450405 Alloy testing apparatus using eddy current conductivity probe May. 22, 1984
4446427 Measuring and control device using the damping effect of a resistive effect element on the inductor of a tuned circuit May. 1, 1984
4361218 Coin testing apparatus Nov. 30, 1982
4306455 Apparatus for checking the geometrical features of mechanical pieces Dec. 22, 1981
4290017 Apparatus and method for nondestructive evaluation of surface flaws in conductive materials Sep. 15, 1981
4283680 Electrical bridge balancing circuit Aug. 11, 1981
4276539 Vehicle detection systems Jun. 30, 1981
4239415 Method of installing magnetic sensor loops in a multiple lane highway Dec. 16, 1980
4219774 Automatic eddy current surface probe for fastener holes Aug. 26, 1980
4150314 Level amplitude output rotary speed transducer Apr. 17, 1979
4092586 Temperature-sensing circuit May. 30, 1978
4074249 Magnetic detection means Feb. 14, 1978
4061968 Process of and apparatus for non-destructive eddy current testing involves the suppression of displayed lobes corresponding to fault parameters to be eliminated from the display Dec. 6, 1977

1 2 3 4

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