JPS6421378A - Digital squid - Google Patents
Digital squidInfo
- 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
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.
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)
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62125469A (en) * | 1985-11-27 | 1987-06-06 | Hitachi Ltd | Request system for inspection item |
-
1987
- 1987-07-16 JP JP62177509A patent/JPH0690267B2/en not_active Expired - Fee Related
Patent Citations (1)
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)
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 |