专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明专利

JPH09222470A LATCH-FREE SQUID FLUXMETER 失效
公开(公告)号：JPH09222470A
公开(公告)日：1997-08-26
申请号：JP5368596
申请日：1996-02-19
申请人： CHODENDO SENSOR KENKYUSHO KK
发明人： KAZAMI KUNIO
IPC分类号： G01R33/035
摘要： PROBLEM TO BE SOLVED: To provide a latch-free SQUID fluxmeter which achieves a continuous measurement without loss of a flux lock against excessive input signals and moreover with a lower noise. SOLUTION: This apparatus comprises a sensor SQUID 1, an SQUID array 8 for amplifying an output thereof, an amplifier 15 for flux locking, an integrator 16, a feedback circuit and a voltage limiter 18 for limiting a feedback value. In SQUIDs, to expand a linear area, the sensor SQUID 1 is provided with a negative feedback circuit comprising a negative feedback resistance 2 and a coupling coil 3 and the SQUID array 8 provided with a negative feedback circuit comprising a negative feedback resistance 9 and an input coil 10. The limiter width is set so that the maximum feedback value of an FLL circuit is below a linear range of the SQUIDs. Thus, the maximum quantity of a magnetic flux to be transmitted to the SQUID 8 is kept from exceeding the linear operation range of the SQUID array 8.

2. 发明专利

JP2586999B2 失效
公开(公告)号：JP2586999B2
公开(公告)日：1997-03-05
申请号：JP7780694
申请日：1994-03-25
申请人： CHODENDO SENSOR KENKYUSHO KK
发明人： TANAKA SABURO , ITOZAKI HIDEO
IPC分类号： G01R31/26 , G01R31/00 , G01R31/30 , H01L21/66

3. 发明专利

JPH08334555A SQUID FLUXMETER AND CALIBRATION METHOD OF SQUID FLUXMETER 失效
公开(公告)号：JPH08334555A
公开(公告)日：1996-12-17
申请号：JP16160195
申请日：1995-06-06
申请人： CHODENDO SENSOR KENKYUSHO KK
发明人： KAZAMI KUNIO , KAWAI ATSUSHI , UEHARA GEN
IPC分类号： G01R33/02 , G01R33/035 , G01R35/00 , H01L39/22
摘要： PURPOSE: To obtain a SQUID fluxmeter by which the frequency characteristic and the noise-resistant characteristic of a superconducting quantum interference device (SQUID) are enhanced by arranging magnetometers whose magnetic-field sensitivites are in opposite directions and whose number is equal so as to be operated as gradiometers. CONSTITUTION: A SQUID fluxmeter 101 is constituted of a SQUID array Aa (N pieces of series-connected ds SQUIDs Sa1 to SsN), a SQUID array Ab (dc SQUIDs Sb1 to SbN) connected to the array Aa, and negative-feedback circuits Na, Nb. The array Aa (or Ab) is connected to terminals Ta, Tb, (or Tb, Tc), the array As and the circuit Na constitute a first magnetometer, and the array Ab and the circuit Nb constitute a second magnetometer of an opposite polarity. In addition, in the circuit Na (or Nb), a negative-feedback resistance Rn is connected directly to coils La1 to LaN (or Lb1 to LbN) for negative feedback. A magnetic flux to be detected is transmitted directly to a SQUID ring. That is to say, the magnetic flux to be detected is negatively fed back so as to be linearlized, it is connected to a magnetometer of an opposite polarity, a gradiometer can be constituted easily, and an excellent frequency characteristic from which an in-phase noise has been removed, can be obtained.

4. 发明专利

JPH08313610A SQUID FLUXMETER 失效
公开(公告)号：JPH08313610A
公开(公告)日：1996-11-29
申请号：JP14688095
申请日：1995-05-23
申请人： CHODENDO SENSOR KENKYUSHO KK
发明人： KAZAMI KUNIO , KAWAI ATSUSHI
IPC分类号： G01R33/035 , H01L39/22
摘要： PURPOSE: To enhance the dynamic characteristics, especially the frequency characteristics and noise resistance, of a superconducting quantum interference device SQUID by providing a plurality of input coils having different flux transmittance connected in series for transmitting a flux to a plurality of SQUIDs. CONSTITUTION: A phase detecting section comprises two SQUIDs S1 , S2 and input coils L1 , L2 coupled through mutual inductances M1 , M2 . The detecting section constitutes the positive feedback circuit for SQUID and reduces the effect of noise of preamplifier. Since the phase relationship is determined by the input current and the coupling inductance, disturbance of phase due to instantaneous interruption of power supply or mixture of noise is recovered instantaneously. When the dynamic range is ensured, reproducibility can be sustained for the recovered output even after long time power interruption. Since the phase is matched between SQUIDs under zero field regardless of whether it can be corrected once under absolute zero field, the SQUID fluxmeter can be used as an absolute fluxmeter even in this case.

5. 发明专利

JP2552250B2 失效
公开(公告)号：JP2552250B2
公开(公告)日：1996-11-06
申请号：JP7920694
申请日：1994-03-28
申请人： CHODENDO SENSOR KENKYUSHO KK
发明人： KAZAMI KUNIO , KAWAI ATSUSHI
IPC分类号： G01R33/035 , H01L39/22

6. 发明专利

JPH08242090A METHOD AND APPARATUS FOR DEMAGNETIZING MAGNETIC SHIELDING ROOM 失效
公开(公告)号：JPH08242090A
公开(公告)日：1996-09-17
申请号：JP6893795
申请日：1995-03-03
申请人： CHODENDO SENSOR KENKYUSHO KK
发明人： KAJIWARA AKIRA
IPC分类号： H01F13/00 , H05K9/00
摘要： PURPOSE: To obtain a reliable demagnetization action using an exciting coil by a method wherein the exciting coil is carried into the interior of a magnetic shielding room and set in there and then the current in the exciting coil is gradually grown from zero until the exciting coil is magnetically saturated and after that the current is gradually decayed and thereby the exciting coil is demagnetized. CONSTITUTION: A coil wire 17 is continuously wound around each coil frame 11 so that adjacent poles may have opposite polarities to each other. Each of the wire-wound coil frames 11 constitutes each coil section 16a of an exciting coil for demagnetization. A winding end of each coil section is connected to a plug 19 through a current controller 18. The current controller 18 is so set that it may gradually grow ac current to be supplied to the exciting coil for demagnetization from zero until the exciting coil is magnetically saturated and after that it may gradually decay the current from the magnetically saturated condition to zero. By this method, a reliable demagnetization action using the exciting coil can be obtained.

7. 发明专利

JPH08240650A REGULATING DEVICE OF PHASE OF SQUID ARRAY 失效
公开(公告)号：JPH08240650A
公开(公告)日：1996-09-17
申请号：JP7047795
申请日：1995-03-06
申请人： AGENCY IND SCIENCE TECHN , CHODENDO SENSOR KENKYUSHO KK
发明人： KAZAMI KUNIO , KAWAI ATSUSHI , UEHARA GEN , KATO HISASHI
IPC分类号： G01R33/035
摘要： PURPOSE: To provide a regulating device of a phase of a SQUID array which can make the phase coincident among discrete SQUIDs in the SQUID array. CONSTITUTION: This regulating device is equipped with a bias coil Li provided for each single dcSQUID Si of an SQUID array A1 or in other ways, a monitor signal source 3 and others for supplying a sine wave current or others to each bias coil Li independently and resistors Rt1-Rtn for current regulation, and the resistors Rt1 Rtn for current regulation are regulated so that every output voltage of each single dcSQUID Si of the SQUID array Al becomes maximum.

8. 发明专利

JP2509150B2 失效
公开(公告)号：JP2509150B2
公开(公告)日：1996-06-19
申请号：JP34898693
申请日：1993-12-28
申请人： CHODENDO SENSOR KENKYUSHO KK
发明人： KOMURO TAKANORI
IPC分类号： G01R33/035 , A61B5/05 , G01R33/10

9. 发明专利

JPH07294614A SQUID ELEMENT 失效
公开(公告)号：JPH07294614A
公开(公告)日：1995-11-10
申请号：JP10746194
申请日：1994-04-25
申请人： CHODENDO SENSOR KENKYUSHO KK
发明人： MATSUDA NAOKI
IPC分类号： G01R33/035
摘要： PURPOSE:To provide a SQUID element showing a high reliability in shock- resistant properties, etc., in a simple constitution. CONSTITUTION:A SQUID loop 3, a pickup coil 5 for detecting an external magnetic flux, and an input coil 6 formed to make a loop together with the pickup coil 5 and magnetically coupling the external, magnetic flux detected by the pickup coil 5 to the SQUID loop 3 are integrally formed on a substrate 2. The pickup coil 5 is formed, for example, in the vicinity of an outer periphery of the substrate 2, with electrodes formed thereinside. The pickup coil 5 and the input coil 6 are arranged to be connected via the SQUID loop 3.

10. 发明专利

JPH07280904A CALIBRATION METHOD FOR SQUID MAGNETIC FLUXMETER 失效
公开(公告)号：JPH07280904A
公开(公告)日：1995-10-27
申请号：JP9702394
申请日：1994-04-12
申请人： AGENCY IND SCIENCE TECHN , CHODENDO SENSOR KENKYUSHO KK
发明人： YOSHIDA TETSUO , HIGUCHI MASANORI , KATO HISASHI
IPC分类号： G01R33/02 , G01R33/035 , G01R35/00 , H01L39/22
摘要： PURPOSE:To provide a calibration method in which the accuracy of the position estimation of a SQUID magnetic fluxmeter inside a heat-insulating container or the like is enhanced and in which the magnetic-field sensitivity of the SQUID magnetic fluxmeter can be calibrated precisely. CONSTITUTION:N pieces of magnetic-field generation coils C1 to CN whose installation positions are known are installed near a SQUID magnetic fluxmeter to be calibrated, and known currents are applied sequentially. In this case, on the basis of the difference between the theoretical value of the output value of the SQUID magnetic fluxmeter which is computed from the theoretical value of a magnetic field which is generated by the arbitrary magnetic-field generation coil Cj in the position of the SQUID magnetic fluxmeter and the measured value of the output value, individual parameters for the vector position rp, the detected magnetic-field-direction vector np and the magnetic-field sensitivity scalar value of the SQUID magnetic fluxmeter are estimated by the method of least squares.

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式