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JPS6488382A - Dc type squid device - Google Patents

Dc type squid device

Info

Publication number
JPS6488382A
JPS6488382A JP62246860A JP24686087A JPS6488382A JP S6488382 A JPS6488382 A JP S6488382A JP 62246860 A JP62246860 A JP 62246860A JP 24686087 A JP24686087 A JP 24686087A JP S6488382 A JPS6488382 A JP S6488382A
Authority
JP
Japan
Prior art keywords
magnetic flux
voltage
signal
squid
modulation
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
JP62246860A
Other languages
Japanese (ja)
Other versions
JPH0638103B2 (en
Inventor
Shinya Kuriki
Kenichi Komatsu
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
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 Toshiba Corp filed Critical Toshiba Corp
Priority to JP62246860A priority Critical patent/JPH0638103B2/en
Publication of JPS6488382A publication Critical patent/JPS6488382A/en
Publication of JPH0638103B2 publication Critical patent/JPH0638103B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Landscapes

  • Superconductor Devices And Manufacturing Methods Thereof (AREA)
  • Measuring Magnetic Variables (AREA)

Abstract

PURPOSE:To remarkably reduce a noise by constituting the titled device so that a modulation voltage is demodulated, a continuous waveform is generated by using the respective voltages at the time of negative bias as reference signals and said voltage is fed back to a superconductive quantum interference element by using this demodulating signal as a magnetic flux. CONSTITUTION:From a modulated magnetic flux generating circuit 3, the AC magnetic flux phim of a frequency fm is generated and it is applied to a loop of a SQUID (superconductive quantum interference element) through a modulation coil L, and a terminal voltage is converted to an AC. Subsequently, by an AC amplifying circuit 4, such as amplifying signal Vfm(t) as only an (fm) component of a modulation voltage Vm(t) is continued is obtained. This signal Vfm(t) is demodulated 8 alternately by two reference signals Vr<+>(t) and the signal, the inverse of Vr<+>(t) obtained by bringing separately modulated magnetic flux phim(t) to phase adjustments 5, 6 and a continuous demodulation voltage Vd is obtained. This voltage Vd is converted to a current after (fm) and (fd) components are removed by an integrator 9, and fed back to the SQUID as a magnetic flux by the coil L. As a result, the magnetic flux in the SQUID loop is kept constant, and a feedback current becomes an output signal being proportional to a magnetic flux phi.
JP62246860A 1987-09-30 1987-09-30 DC type SQUID device Expired - Lifetime JPH0638103B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62246860A JPH0638103B2 (en) 1987-09-30 1987-09-30 DC type SQUID device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62246860A JPH0638103B2 (en) 1987-09-30 1987-09-30 DC type SQUID device

Publications (2)

Publication Number Publication Date
JPS6488382A true JPS6488382A (en) 1989-04-03
JPH0638103B2 JPH0638103B2 (en) 1994-05-18

Family

ID=17154803

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62246860A Expired - Lifetime JPH0638103B2 (en) 1987-09-30 1987-09-30 DC type SQUID device

Country Status (1)

Country Link
JP (1) JPH0638103B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5975778A (en) * 1992-06-10 1999-11-02 Canon Kabushiki Kaisha Recording apparatus having a recording material confining member

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5975778A (en) * 1992-06-10 1999-11-02 Canon Kabushiki Kaisha Recording apparatus having a recording material confining member

Also Published As

Publication number Publication date
JPH0638103B2 (en) 1994-05-18

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