JPS6421378A - Digital squid - Google Patents

Digital squid

Info

Publication number
JPS6421378A
JPS6421378A JP62177509A JP17750987A JPS6421378A JP S6421378 A JPS6421378 A JP S6421378A JP 62177509 A JP62177509 A JP 62177509A JP 17750987 A JP17750987 A JP 17750987A JP S6421378 A JPS6421378 A JP S6421378A
Authority
JP
Japan
Prior art keywords
squid
incremental
output
superconductive
current
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.)
Granted
Application number
JP62177509A
Other languages
Japanese (ja)
Other versions
JPH0690267B2 (en
Inventor
Norio Fujimaki
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP62177509A priority Critical patent/JPH0690267B2/en
Publication of JPS6421378A publication Critical patent/JPS6421378A/en
Publication of JPH0690267B2 publication Critical patent/JPH0690267B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Landscapes

  • Measuring Magnetic Variables (AREA)
  • Measurement Of Current Or Voltage (AREA)
  • Superconductor Devices And Manufacturing Methods Thereof (AREA)

Abstract

PURPOSE:To reduce the number of the bits of an incremental and decremental counter by allowing positive and negative to almost alternately appear in the output pulse of a digital SQUID, by applying a bias current having an amplitude modulated waveform to the SQUID. CONSTITUTION:A current to be measured is allowed to flow to a SQUID composed of a superconductive loop containing a superconductive inductance L and two Josephson junctions J1, J2 for coupling a magnetic field are provided to said SQUID. The output of an amplitude modulated waveform generator 1A is connected to the asymmetric injection terminal B of the SQUID to apply a bias current to said AQUID and output is taken out from the injection terminal B to be converted to a feedback current If by an incremental and decremental counter 3, an integrator 4 and a D/A converter 5 and fed back to a superconductive inductance Lf to be coupled with the SQUID. By this method, positive and negative output pulses are almost alternately obtained to suppress the number of the bits of the incremental and decremental counter.
JP62177509A 1987-07-16 1987-07-16 Digital squid Expired - Fee Related JPH0690267B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62177509A JPH0690267B2 (en) 1987-07-16 1987-07-16 Digital squid

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62177509A JPH0690267B2 (en) 1987-07-16 1987-07-16 Digital squid

Publications (2)

Publication Number Publication Date
JPS6421378A true JPS6421378A (en) 1989-01-24
JPH0690267B2 JPH0690267B2 (en) 1994-11-14

Family

ID=16032149

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62177509A Expired - Fee Related JPH0690267B2 (en) 1987-07-16 1987-07-16 Digital squid

Country Status (1)

Country Link
JP (1) JPH0690267B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02231579A (en) * 1989-03-03 1990-09-13 Nippon Telegr & Teleph Corp <Ntt> Metal conductor discrimination device
JPH06258360A (en) * 1992-07-22 1994-09-16 Trw Inc High-sensitivity superconducting digitizer

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62125469A (en) * 1985-11-27 1987-06-06 Hitachi Ltd Request system for inspection item

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62125469A (en) * 1985-11-27 1987-06-06 Hitachi Ltd Request system for inspection item

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02231579A (en) * 1989-03-03 1990-09-13 Nippon Telegr & Teleph Corp <Ntt> Metal conductor discrimination device
JPH06258360A (en) * 1992-07-22 1994-09-16 Trw Inc High-sensitivity superconducting digitizer

Also Published As

Publication number Publication date
JPH0690267B2 (en) 1994-11-14

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Legal Events

Date Code Title Description
LAPS Cancellation because of no payment of annual fees