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GB1146820A - Magnetic field senser - Google Patents

Magnetic field senser

Info

Publication number
GB1146820A
GB1146820A GB1010568A GB1010568A GB1146820A GB 1146820 A GB1146820 A GB 1146820A GB 1010568 A GB1010568 A GB 1010568A GB 1010568 A GB1010568 A GB 1010568A GB 1146820 A GB1146820 A GB 1146820A
Authority
GB
United Kingdom
Prior art keywords
rings
magnetic field
minima
output
pair
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB1010568A
Inventor
Anton Karel Niessen
Frederick Warren Smith
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Philips Components Ltd
Original Assignee
Mullard Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mullard Ltd filed Critical Mullard Ltd
Priority to GB1010568A priority Critical patent/GB1146820A/en
Publication of GB1146820A publication Critical patent/GB1146820A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
    • G01R33/022—Measuring gradient
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
    • G01R33/035—Measuring direction or magnitude of magnetic fields or magnetic flux using superconductive devices
    • G01R33/0354—SQUIDS

Landscapes

  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Magnetic Variables (AREA)

Abstract

1,146,820. Measuring magnetic fields. MULLARD Ltd. March 1, 1968, No.10105/68. Heading G1N. Apparatus for sensing perturbations in a weak magnetic field comprises a pair of rigidly connected spaced apart superconducting rings R 1 , R 2 , each ring comprising a pair of insulating barriers (Josephson junctions) J 1 , J 2 , the maximum tunnelling current through which varies as a periodic function of magnetic field strength. Terminals 1, 2 are connected to a D.C. or low frequency A.C. source and the voltage across resistor 3 is taken as the output from each ring and fed to a differential amplifier DA whereby, when the rings are displaced or rotated through a small angle about the centre of line RC, the number of minima (or maxima) in the output 6 is a function of the difference in the magnetic field strengths at the rings. The effective sharpness of the minima may be increased by arranging that the tunnelling maximum supercurrent be just exceeded, keeping the voltage constant, and counting the actual current minima. Two pairs of rings may be arranged with their lines RC at right angles, Fig. 5 (not shown). The output of one of the rings may be observed separately. Non- magnetic conductive shielding may enclose the apparatus. The rings should be of equal area or compensation circuits may be used.
GB1010568A 1968-03-01 1968-03-01 Magnetic field senser Expired GB1146820A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1010568A GB1146820A (en) 1968-03-01 1968-03-01 Magnetic field senser

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1010568A GB1146820A (en) 1968-03-01 1968-03-01 Magnetic field senser

Publications (1)

Publication Number Publication Date
GB1146820A true GB1146820A (en) 1969-03-26

Family

ID=9961589

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1010568A Expired GB1146820A (en) 1968-03-01 1968-03-01 Magnetic field senser

Country Status (1)

Country Link
GB (1) GB1146820A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5053706A (en) * 1987-07-06 1991-10-01 Mitsubishi Denki Kabushiki Kaisha Compact low-distortion squid magnetometer
GB2331157A (en) * 1985-08-23 1999-05-12 Licentia Gmbh An arrangement for determining the geometry and gradients of magnetic fields

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2331157A (en) * 1985-08-23 1999-05-12 Licentia Gmbh An arrangement for determining the geometry and gradients of magnetic fields
GB2331157B (en) * 1985-08-23 1999-09-22 Licentia Gmbh An arragement for determining the geometry and radients of magnetic fields
US5053706A (en) * 1987-07-06 1991-10-01 Mitsubishi Denki Kabushiki Kaisha Compact low-distortion squid magnetometer

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