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7576534 |
System and method to forecast the electrical conductivity of anodes for aluminum production before baking
The system ( 10 ) and the method are used for forecasting the electrical conductivity of an anode ( 12 ) for aluminum production before the anode ( 12 ) is baked. In the system ( 10 ), at least one...
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7545691 |
Measuring circuit for qualifying a memory located on a semiconductor device
A measuring circuit is provided for a memory integrated within a semiconductor device. The measuring circuit includes initializing means and an oscillating loop. The initializing means loadings two...
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7511585 |
Automatic page detector
The present invention discloses an automatic page detector, to determine which page of a book is open. The automatic page detector uses a sensor plate and an inductor as a sensor. In the invention,...
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7498804 |
Resonance current sensing
A current measurement system includes a magnetic core having an inside area through which a conductor carrying current to be measured extends. A measurement winding is wound on the magnetic core. A...
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7372255 |
Detection of the instantaneous position of a linearly reciprocating member using high frequency injection
A piston position sensing circuit for sensing the instantaneous position of a piston of a free piston Stirling machine or a compressor mechanically connected to a reciprocating member of a linear...
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7336069 |
Eddy current sensor and sensor coil for the same
The invention pertains to an eddy current sensor with a sensor circuit having a head portion, including a sensor coil, a base portion and a transmission cable connecting the head portion to the...
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7298261 |
Proximity sensor
An operation section 2 is provided to a proximity sensor including: a detection section having an oscillation circuit 10; and an amplification section 2 having a function detecting a metal...
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7265542 |
Process and device for contactless measurement of rotational speed
A process and a device for contactless measurement of rotational speed with a proximity sensor operating according to the eddy current principle. The proximity sensor comprises an inductor and a...
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7241630 |
Paramagnetic particle detection
A method of determining the number of magnetic particles within a sample using a tuned circuit having a capacitor and a coil. The method comprises:
a. determining the difference in the...
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7239133 |
Methods and systems for controlling the temperature stability of an inductor
Methods and systems a method of assembling a proximity probe are provided. The method includes determining a coil wire dimension and coil geometry for the probe such that a resistance versus...
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7113876 |
Technique and electronic circuitry for quantifying a transient signal using threshold-crossing counting to track signal amplitude
Circuitry adapted for carrying out associated techniques for: (a) calculating a damping factor, e.g., a damping ratio represented by ζ, or a quality factor Q, where ζ≈1/2Q, for a transient...
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6984994 |
Position and electromagnetic field sensor
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...
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6948388 |
Wireless remote sensor
A sensing system includes a ring oscillator that emits electromagnetic radiation at a characteristic frequency. The ring oscillator comprises an odd number plurality of inverters that are...
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6885277 |
Externally adjustable impedance transformer
An externally adjustable RF impedance matching mechanism comprises an upper lid and a base containing a circuit element board therebetween. One or more than one precise adjustment device for...
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6643909 |
Method of making a proximity probe
Method of making a proximity probe including providing a preform having an interior cavity accessible by an opened rearward end; coupling a coil to the preform proximate a forward most end of the...
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6600313 |
Device for reading an elongate magnetic data carrier
A device for reading an elongate magnetic data carrier attached to or embedded in an article, having an active read head adapted to have a lateral extent greater than the width of the data carrier,...
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6556090 |
Oscillator circuit for a validator
A coin validator tests a coin using a pair of coils coupled in an oscillator circuit which is arranged to drive both the coils concurrently at two separate frequencies without interference...
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6541964 |
Method and apparatus for determining hydride content in a measurement object
The invention concerns a method and apparatus for determining the hydride content in an electrically conductive substrate by generating a first electromagnetic alternating field that at least...
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6456067 |
Inductive product sensor for a refreshment center
A product sensor system for use in a refreshment center configured to sense a number of metal product containers. The sensor device can comprise a support shelf mounted in the refreshment center,...
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6437581 |
Two wire sensor device
Two-wire sensors for measuring physical quantities have only two connections (A 1 , A 2 ), which serve to connect the power supply and also to conduct the measuring signals. However, because...
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6356077 |
Method of and device for determining a time-dependent gradient of a shock wave in a ferromagnetic element subjected to a percussion load
A method of determining a time-dependent gradient of a shock wave in a percussion or subjected to a percussion load ferromagnetic element and including subjecting the ferromagnetic element to...
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6345228 |
Road vehicle sensing apparatus and signal processing apparatus therefor
A road vehicle sensor provides an output signal having a magnitude which varies with time through a plurality of values as a vehicle passes the sensor. Signal processing apparatus monitors the...
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6326790 |
Ground piercing metal detector having range, bearing and metal-type discrimination
A hand tool has a handgrip attached to a ground-piercing probe, which is manually insertable in the soil. The probe has a chamber in which at least one inductor is positioned and connected to metal...
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6304083 |
Magnetic field sensor with colossal magneto-resistive material contained within the coil of an oscillator
Sensors, systems and methods for measuring magnetic field strengths in both AC and DC magnetic fields by using CMR material in tunable, radio-frequency LC oscillators are disclosed.
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6281680 |
Method and apparatus for distinguishing synthetic diamonds from natural diamonds
A method and apparatus are provided for distinguishing synthetic diamonds from natural diamonds by detecting the effect the synthetic diamonds have on a magnetic field. A counter can be provided...
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6255810 |
Inductive angle sensor having coupled oscillators with similar inductive response
A redundant inductive angle sensor has two LC oscillators of at least approximately identical design. By inductively coupling the oscillators, the oscillators synchronize themselves with respect to...
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6246229 |
Method and apparatus for controlling the temperature stability of an inductor using a magnetically coupled metallic object
A method and apparatus for controlling temperature stability of an inductor by using a magnetically coupled metallic object is disclosed in which a metallic object is magnetically coupled to the...
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6237418 |
Method and apparatus for detecting misapplied caps on containers
Method and apparatus by which misshapen crown caps on beverage containers, such as bottles traveling along high-speed bottling lines, may be detected. Bottles are arranged to travel directly...
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6215365 |
Inductive proximity sensor oscillator
An inductive proximity sensor oscillator having a differential comparator in combination with a negative feedback network and a positive feedback network connected to the comparator. The positive...
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6211672 |
Human appendage mounted metal detector
A metal detector that is to be attached to a human appendage and preferably the wrist and hand of a human. A metal detector includes a housing which is to be worn strictly by the human hand or the...
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6208134 |
Interference-tolerant proximity sensor system having a resonance-tracking impedance analyzer
A system to analyze the impedance of interference-tolerant proximity sensors. A lock-in amplifier (LIA) is implemented as a resonance-tracking oscillator. The control loop of the amplifier monitors...
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6191580 |
Configurable inductive proximity detector to detect ferrous or non-ferrous metal objects
An oscillator 12 outputs a constant frequency as a metal object is brought close and this frequency forces oscillation of an oscillating circuit 11 which is sensitive to this metal object, at a...
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6163149 |
Device for determining the dissolution time of medicaments in pressed form, like tablets, pills or capsules
The invention relates to a device for determining the dissolution time of medication in pressed form, like tablets and capsules, (especially to DAB 10, 3rd Supplement 1994, or the European...
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6145646 |
Device for checking the authenticity of coins, tokens or other flat metal objects
An apparatus for testing the authenticity of coins, tokens or other flat metal articles includes a coin passage with a lower and an upper side wall. A coin moves in a condition of bearing against...
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6087743 |
Position control system for use with micromechanical actuators
A positioning system adapted for use with micromechanical actuators provides feedback control of the position of the movable element of the actuator utilizing a low Q sensing coil. The effective...
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6057683 |
Induction sensor having conductive concentrator with measuring gap
An induction head for sensing a magnetic strip or other magnetically permeable security structures includes an exciting coil associated with an electrically conductive concentrator, which produces...
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6040694 |
Method and device for determining the thickness of an electrically conductive layer
The invention relates to a method according to the eddy-current testing principle, and to a device for determining the thickness of an electrically conductive protective layer which is applied to...
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6032110 |
Lateral positioning detecting apparatus for moving body
Markers each comprising an electromagnetic coil are installed on the surface of a road at a lateral center line of a running lane of the road at predetermined intervals. Provided for each of the...
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5994897 |
Frequency optimizing metal detector
A metal detector (10) which uses a metallic test sphere (5) to pass with the product through the detector head (2) at periodic intervals. The frequency generator (21) which generates the signal...
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5986549 |
Position and movement reasonant sensor
An object sensing system (10) employs a resonant sensor (20) that receives drive energy coupled from an oscillator (12) operating at a frequency equal or close to the resonant frequency of the...
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5977766 |
Method and device for inductive measurement of physical parameters of an object of metallic material with error compensation
A method and a device for inductive measurement of physical parameters of an object of metallic material by generating a time-varying magnetic field from a primary coil in a measurement range. The...
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5963030 |
Pipe inspection apparatus and process
An openable ring assembly is externally centered around and moved parallel to the centerline of a stationary pipe. As a low-frequency EM source signal is applied to the ring assembly, the time...
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5959451 |
Metal detector with vibrating tactile indicator mounted within a compact housing
A compact hand-held metal detector that detects small ferrous and non-ferrous metal objects, that has a detection pattern in three planes, and that includes a plurality of detection alarm...
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5949293 |
Integrated circuit for measuring the distance
An integrated circuit for measuring the distance houses an oscillator in a package. Further, a plane inductor is provided on the surface of the package housing the oscillator. The plane inductor is...
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5929635 |
Digital oscillator and supply circuit for an eddy current probe
The present invention relates to a digital oscillator comprising an oscillator (40), a counter (41), a memory (42), a digital-analog converter (43) and a low-pass filter (44). The memory is able to...
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5844502 |
Temperature-compensated object sensing device and method therefor
A device and method is provided for sensing an object or vehicle in proximity to a sensing zone, wherein the device is exposed to an environment temperature. The object sensing device comprises a...
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5801530 |
Proximity sensor having a non-ferrous metal shield for enhanced sensing range
A proximity sensor includes a transducer and a circuit having a switch that changes state in response to a presence of an object in spaced relation to the transducer. The transducer includes a...
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5767672 |
Inductive proximity sensor for detecting magnetic and non-magnetic metallic objects
A universal inductive proximity detector including an oscillator, whose oscillating circuit is powered by a current source. A fixed frequency master oscillator 16, which controls the current source...
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5764050 |
Method for the reliable determination of the distance of the conductive reaction track from a functional surface of a magnetic levitation vehicle moving relative to the reaction track and a sensor for performing the method
In a method for measuring a distance between a conducting reaction track and a functional surface moving relative to the reaction track a sensor with two signal transmitters is provided on the...
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5663642 |
Resonant inductive debris detector
Apparatus is disclosed for detecting the presence of the type of debris in a fluid system. The apparatus detects the presence of debris, measures the accumulation and identifies the specific types...
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