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Class 324/301 - Using a magnetometer


Subclass of Class 324 - Electricity: measuring and testing
Definition: Subject matter utilizing means to measure the effects of
No. of patents: 95
Last issue date: 11/08/2011


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NumberTitleIssue Date
4613816Cryogenic magnetic probe having new substrate
A magnetic probe for detecting the location of a magnetic anomaly. The probe includes an outer dewar jacket that defines a chamber maintained at cryogenic temperatures by a helium reservoir. Mounted on the reservoir in the chamber is a substrate which sup...
09/23/1986
4600886Apparatus for orienting a magnetometer
A system for measuring the earth's magnetic field includes a magnetometer and apparatus for maintaining a predetermined magnetometer tilt in the magnetic meridional plane regardless of changes in vehicle heading. The magnetometer is of the type whose opti...
07/15/1986
4567439Apparatus for measuring the magnitude of a magnetic field
An apparatus for measuring the magnitude of a magnetic field in one embodiment includes a 3 He cell having an oscillator connected thereto for producing an electrical discharge for metastable 3 He atoms, a 4 He lamp having...
01/28/1986
4546317Free nuclear precession gradiometer system
A free nuclear precession gradiometer uses a fluid sample surrounded by a il the fluid sample containing one or more nuclear species which display a magnetic moment. Current in the coil polarizes the nucleii, which when the current is abruptly terminated ...
10/08/1985
4544891Nuclear magnetic resonance gyroscope
A nuclear magnetic resonance gyroscope which derives angular rotation thef from the phases of precessing nuclear moments utilizes a single-resonance cell situated in the center of a uniform DC magnetic field. The field is generated by current flow throug...
10/01/1985
4525672Apparatus and method for laser pumping of nuclear magnetic resonance cell
A method and apparatus for optical pumping of an NMR cell by means of laser light. A current driver provides an a.c. current waveform as injection current to a laser diode. The resulting laser intensity spectrum closely approximates the absorption spectru...
06/25/1985
4514691Baggage inspection apparatus and method for determining presences of explosives
This method and apparatus are directed to baggage inspection, and more particularly, baggage inspection to locate explosives. In the preferred and illustrated embodiment, a conveyor system is utilized to transport a bag past a first magnet to achieve an i...
04/30/1985
4446428Magnetic resonance cell
There is disclosed a nuclear magnetic alignment device for use in a nuclear magnetic resonance gyroscope and the like. One embodiment includes a container for gas having a layer of rubidium hydride on its inner surface. The container comprising a spherica...
05/01/1984
4427943Apparatus and method for locating and tracking magnetic objects or sources
At least one pair of vector gradiometers is employed to locate (and track) magnetic objects or sources. A first signal, S, is produced as a function of the difference in the absolute values of output signals L and R from left and right gradiometers, respe...
01/24/1984
4418316Nuclear magnetic resonance apparatus
In nuclear magnetic resonance (NMR) imaging systems it is known to excite resonance in a slice of a body and then to sample the resonance signals in the presence of a field gradient across the slice. It has been proposed that the signals should be sampled...
11/29/1983
4209746Magnetic field gradient measuring device
Disclosure is made of a magnetic field gradient measuring device comprising two sensors arranged at points of a magnetic field which are to be investigated, and connected with their outputs to inputs of a phase detector. Each of the two sensors comprises ...
06/24/1980
4193029Pulsed helium magnetometer
1. A pulsed helium magnetometer comprising; a cell containing metastable helium adapted to be placed in a magnetic field to be measured, means including a helium lamp for optically pumping said metastable helium to produce atomic alignment of the helium atoms ...
03/11/1980
4147974Nuclear gyroscope with unequal fields
An optically pumped magnetic resonance gyroscope wherein the direction of the magnetic fields intersecting the absorption cells of two interconnected spin generators may be oriented in the same or opposite directions, but are of unequal magnitude. The out...
04/03/1979
4126823Magnetic field detection apparatus
A magnetic field detector for determining the presence of a magnetic field disturbance in the vicinity of the apparatus senses the difference in magnetic fields at two spaced-apart locations. A pair of field sensors, each including a body of polarizable l...
11/21/1978
4114087Magnetic or electric measuring devices
Apparatus for measuring magnetic field strength which comprises two Nuclear Magnetic Resonance cells (the NMR cells), a field generator for applying to the NMR cells bias magnetic field which is parallel and of substantially equal strength at each NMR cel...
09/12/1978
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