(0)G01R:7/7:

(0)G01R:7/7:

IPC6

SECTION G - PHYSICS

MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES ...

G01R

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G01R033/00 - G01R035/04

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Arrangements or instruments for measuring magnetic variables

Measuring direction or magnitude of magnetic fields or magnetic flux (G 01 R 33/20 takes precedence; measuring direction or magnitude of the earth's field for navigation or surveying G 01 C; for prospecting, for measuring the magnetic field of the earth G 01 V 3/00) [4]

Note

Group G 01 R 33/022 or group G 01 R 33/10 takes precedence over groups G 01 R 33/025 to G 01 R 33/095.

Measuring gradient [3]

Compensating stray fields [3]

Electrodynamic magnetometers [3]

using magneto-optic devices, e.g. Faraday [3]

using superconductive devices [3]

using permanent magnets, e.g. balances, torsion devices [3]

using the flux-gate principle

in thin-film element [3]

using galvano-magnetic devices

Hall-effect devices [6]

Magneto-resistive devices [6]

Plotting field distribution

Measuring magnetic properties of articles or specimens of solids or fluids (involving magnetic resonance G 01 R 33/20) [4]

Measuring or plotting hysteresis curves

Measuring susceptibility

Measuring magnetostrictive properties

involving magnetic resonance (medical aspects A 61 B 5/055; magnetic resonance gyrometers G 01 C 19/60) [4,5]

for measuring direction or magnitude of magnetic fields or magnetic flux [4]

using optical pumping [4]

Details of apparatus provided for in groups G 01 R 33/44 to G 01 R 33/64 [5]

Sample handling arrangements, e.g. sample cells, spinning mechanisms [5]

Temperature control thereof [6]

Excitation or detection systems, e.g. using radiofrequency signals [5]

Constructional details, e.g. resonators [5]

comprising surface coils [6]

comprising arrays of sub-coils [6]

of slotted-tube or loop-gap type [6]

of waveguide type (G 01 R 33/343 takes precedence) [6]

Electrical details, e.g. matching or coupling of the coil to the receiver [5]

Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field [5]

Note

Groups G 01 R 33/385 to G 01 R 33/389 take precedence over groups G 01 R 33/381 to G 01 R 33/383. [6]

using electromagnets (electromagnets per se H 01 F 7/06) [6]

with superconducting coils, e.g. power supply therefor (superconductive magnets H 01 F 6/00) [6]

using permanent magnets (permanent magnets per se H 01 F 7/02) [6]

using gradient magnetic field coils [6]

Compensation of inhomogeneities (screening G 01 R 33/42) [6]

using ferromagnetic bodies [6]

using correction coil assemblies, e.g. active shimming [6]

Field stabilisation [6]

(transferred to G 01 R 33/3875)

Screening (screening in general H 05 K 9/00) [5,6]

of main or gradient magnetic field [6]

of the radiofrequency field [6]

using nuclear magnetic resonance (NMR) (G 01 R 33/24, G 01 R 33/62 take precedence) [5]

NMR spectroscopy [5]

applied to biological material, e.g. in vitro testing [6]

NMR imaging systems [5]

with selection of signal or spectra from particular regions of the volume, e.g. in vivo spectroscopy [6]

based on chemical shift information [6]

based on the determination of relaxation times [5]

(transferred to G 01 R 33/485)

Signal processing systems, e.g. using pulse sequences [5]

Image enhancement or correction, e.g. subtraction or averaging techniques [5]

by reduction of the scanning time, i.e. fast acquiring systems, e.g. using echo-planar pulse sequences [6]

of moving material, e.g. flow-contrast angiography [6]

Correction of image distortions, e.g. due to magnetic field inhomogeneities [6]

gated by physiological signals [6]

Calibration of imaging systems, e.g. using test probes [5]

using electron paramagnetic resonance (G 01 R 33/24, G 01 R 33/62 take precedence) [5]

using double resonance (G 01 R 33/24 takes precedence) [5]

using cyclotron resonance (G 01 R 33/24 takes precedence) [5]

Testing or calibrating of apparatus covered by the preceding groups [2]

of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating

of instruments for measuring time integral of power or current

by stroboscopic methods

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