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3973191 |
Inductive displacement sensor apparatus
A variable inductor having a U-shaped magnetic core with a short-circuiting plate providing a short-circuiting ring for both legs of the core movable along the core legs in response to a...
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3971982 |
Plural frequency multi-phase transducer arrangement for detecting the presence and location of faults in a metal body and compensating for body movements
Improved apparatus for detecting and locating defects in metal bodies of the type in which the body under test is difficult to keep centered in which a multi-phase transducer coil induces currents...
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3962627 |
Electronic apparatus for testing moving coins employing successive time significant sensings of the effects of proximity of a coin under test to inductive impedance elements upon the effective impedances thereof
An improved method and apparatus for testing coins, metallic credit tokens and similar objects, capable of determining both type or denomination and genuineness thereof, utilize the effect upon the...
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3953791 |
Apparatus for and method for testing the number of turns on a coil
Apparatus and method for testing the number of turns on a coil by magnetically energizing a rod through an energizing coil and with compensating coils modifying the flux about the rod to provide a...
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3949293 |
Apparatus and method for detecting a moving metal mass including means to discriminate signals having a particular period
In an electronic detection system, signals indicative of a detected mass of material are related to a selected mass velocity and a detection aperture through which the mass is moved. The pulse...
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3936734 |
Method for contactless measurement of conductivity and/or temperature on metals by means of eddy currents
A method for contactless measurement of conductivity and/or temperature on metals by means of the eddy current effect induced within the metal by an alternating magnetic field produced by an...
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3936739 |
Method and apparatus for generating error corrected signals
A method and apparatus for automatically generating error corrected pulses in response to particle pulses which are subject to error due to coincidence. The subject apparatus includes a generator...
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3926053 |
Apparatus for non-contact, accurate and continuous determination of surface temperature on a part
Apparatus for non-contact, accurate, and continuous determination of the surface temperature on a rotatable part which includes a sensing probe unit containing detecting means for both temperature...
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3925725 |
Oscilloscopic ferrometer
An oscilloscopic ferrometer comprising a magnetizing system in the form of a stepdown transformer having a single-turn secondary winding and at least two ellipsoidal solenoids connected thereto and...
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3890564 |
Apparatus for inducing eddy current in a semiconductor wafer for measuring the electric conductivity or resistivity thereof
An apparatus for measuring electric conductivity or resistivity of a semiconductor wafer with no electric contact to the wafer, which comprises an exciting circuit including a first exciting coil...
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3863141 |
Frequency analyzing apparatus for use with an eddy current detector
A frequency analyzing apparatus comprising an amplifier, a negative feedback circuit connected between the input and output terminals of the amplifier and a positive feedback circuit having a...
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3835374 |
METHOD AND APPARATUS FOR PROVIDING SPEED COMPENSATION FOR INFORMATION CONTAINING SIGNALS IN WHICH THE THRESHOLD LEVEL OF THE DETECTOR IS VARIED PROPORTIONAL TO SPEED
Certain types of equipment, for example, certain types of instrument pigs used for detecting flaws in or other characteristics of pipelines, employ sensing devices that derive...
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3758849 |
METAL DETECTOR SYSTEM HAVING IDENTICAL BALANCED FIELD COIL SYSTEM ON OPPOSITE SIDES OF A DETECTION ZONE
A balanced field metal detector apparatus comprising a coil assembly including planar, generally rectangular loop configured multi-turn field and sensor coils disposed in partially overlapping...
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3750010 |
VIBRATION ANALYZER PROBE WITH REDUCED TEMPERATURE SENSITIVITY
Disclosed is a simplified and inexpensive probe for non-contacting vibration analyzers, and an analyzer employing the probe, which probe is substantially insensitive to temperature variations. The...
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3745449 |
METHOD AND APPARATUS FOR TESTING WELDED PIPE FOR ANOMALIES WITH MEANS TO CHANGE THE SENSITIVITY WHEN TESTING THE WELDED AREA
Apparatus and method for nondestructively inspecting a tubular member of uniform wall thickness having a weld line extending throughout its length. Complete circumferential inspection is...
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3721859 |
METAL OBJECT SENSOR, PARTICULARLY FOR RAILWAY WHEELS
A sensor for sensing movement of a metal object, such as a railway wheel, along a given path, comprising three sensing coils, all tuned to the same operating frequency, spaced along the path with...
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3715659 |
INDUCTIVE NON-CONTACT VIBRATION ANALYZER WHICH IS INDEPENDENT OF STANDOFF DISTANCE
Disclosed is a non-contact vibration analyzer that is substantially independent of standoff distance. An inductive probe produces an electrical output having AC and DC components that vary...
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3714558 |
MAGNETIC SENSOR FOR DETECTING BREAKS IN A STEEL ROPE INCLUDING MULTIPLIER FOR ELIMINATING NOISE
Apparatus for detecting wires in a steel wire winding rope in which the rope is passed through a magnetic field and sensing coils are employed to detect any magnetic dipoles created between the...
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3696290 |
MAGNETIC NON-CONTACT THICKNESS GAUGE WITH MEANS TO COMPENSATE THE EFFECTS OF STRAY FIELDS ON THE GAUGE
A thickness measuring device wherein means are positioned at opposite sides of and in selected spacing relative to a work piece being measured and respectively include magnet responsive means...
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3686563 |
APPARATUS UTILIZING AN AIR CORE TRANSFORMER FOR DETERMINING MAGNETIC MATERIAL CONTENT OF A SUBSTANCE
An air-core transformer is adapted to receive a sample of the substance to be tested for content of magnetic material, e.g., the mineral magnetite. It is supplied, usually through load-isolating...
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3619805 |
NONCONTACTING DISPLACEMENT TRANSDUCER INCLUDING AN OSCILLATOR WITH CABLE-CONNECTED INDUCTIVE PROBE
Disclosed is an eddy-current-type noncontacting displacement transducer and gage for gaging the distance between a probe tip and a metallic surface. The transducer comprises a modified common base...
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3611120 |
EDDY CURRENT TESTING SYSTEMS WITH MEANS TO COMPENSATE FOR PROBE TO WORKPIECE SPACING
A nondestructive testing system is disclosed for inspecting the surface of a workpiece for hidden defects. The system includes a probe for creating eddy currents in the surface and precisely...
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3609735 |
INDUCTIVE-CAPACITIVE PROBE IN MACHINE FOR HANDLING SHEETLIKE MATERIAL
Machine for handling sheetlike material, such as a printing press and a sheet feeder therefor, having a combined inductive-capacitive probe for discriminating among the presence of a single...
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3573784 |
METAL DETECTING APPARATUS FOR CONVEYOR BELT
For detecting metal traveling along a conveyor belt, an excitation coil and a pair of pickup coils are positioned adjacent the belt. A signal voltage is induced in the pickup coils whenever a...
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3541394 |
PROXIMITY TRANSDUCER
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3532971 |
FEEDBACK SYSTEM FOR AUTOMATIC RANGE COMPENSATION OF A TRANSDUCER
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3502968 |
EDDY CURRENT INDUCTIVE FLATNESS MEASUREMENT DEVICE
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3496458 |
METHOD AND APPARATUS FOR DETECTING AND MEASURING CRACKS IN METAL STRUCTURES
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3496457 |
SIGNAL NORMALIZATION APPARATUS FOR PIPELINE LOGGING
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3449661 |
EDDY CURRENT TESTING SYSTEM HAVING LIFT-OFF COMPENSATION,AND UTILIZING A TUNED PLATE-TUNED GRID OSCILLATOR
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3424976 |
MAGNETIC DEVICE FOR DETERMINING DEFECTS IN ROD-LIKE ELEMENTS,CABLES,STEEL PIPES AND THE LIKE
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3394303 |
Eddy current inspection apparatus and method of calibrating
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3389333 |
Control system for maintaining a desired magnetic field in a given space
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3378763 |
Eddy current probe with temperature compensation
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3358225 |
Lift-off compensation for eddy current testers
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3346807 |
Reciprocating apparatus with means to maintain the reciprocation centered over an anomaly
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3345563 |
Method and apparatus for measuring true discontinuities in members of varying thickness by compensating for the effect of thickness on such measurements
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3328681 |
Electromagnetic flow detection apparatus with velocity compensation
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3244970 |
Electrical circuits for sockets usable with pluggable modules for flaw detection
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3197693 |
Nondestructive eddy current subsurface testing device providing compensation for variation in probe-to-specimen spacing and surface irregularities
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3170112 |
Magnetic circuit means and alloy components of constant magnetic permeability therefor
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3080507 |
Apparatus for stabilizing magnetic fields
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3078412 |
Apparatus for indicating the metal oxide content of a liquid metal
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3058058 |
Magnetic concentricity gage
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3052837 |
Pipe finder
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3042857 |
Electromagnetic prospecting apparatus
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3024412 |
Magnetic measuring instrument
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2980849 |
Sensing head for weld seam testing apparatus
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2945379 |
Accelerometer and magneto-resistive electromechanical transducer used therein
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2928044 |
Recording magnetometer
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