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1. 发明专利

JPH0843450A LIGHT CURRENT TRANSFORMER 失效
公开(公告)号：JPH0843450A
公开(公告)日：1996-02-16
申请号：JP17819294
申请日：1994-07-29
申请人： TOSHIBA CORP
发明人： MIURA HIROSHI , TAMAGAWA TORU , IKUTA SAKAE , TERAI KIYOHISA , TAKAHASHI MASAO , NIWA KEIKO , MIZUTANI YUJI
IPC分类号： G01R15/24 , G01R19/00
摘要： PURPOSE:To obtain a light current transformer which can accurately measure current even under an environment with a large vibration and temperature change by preventing the reduction in accuracy due to beam fluctuation accompanied by current increase. CONSTITUTION:One sensing fiber 11 is wound around a circular-ring-shaped bobbin laid out at the outer-periphery part of a conduction conductor 2 in a plurality of times. An emission light reflected by a reflection material 24 provided at the other edge side of a sensing fiber 11 by applying a straight-line polarization obtained by inputting light from a light source 14 to a connection optical box 19 via a fiber 12 from one edge side of the sensing fiber 11 is detected by a detector 15 via a fiber 13. In a light current transformer for measuring the current flowing to the conduction conductor 2 by utilizing Faraday effect, a continuous fiber insertion groove is provided on the outer-periphery surface of the bobbin, the sensing fiber 11 is inserted and fixed along the fiber insertion groove, and at the same time the bobbin is laid out at the grounding side.

2. 发明专利

JPH07333257A OPTICAL CURRENT TRANSFORMER 失效
公开(公告)号：JPH07333257A
公开(公告)日：1995-12-22
申请号：JP12750094
申请日：1994-06-09
申请人： TOSHIBA CORP
发明人： TAKAHASHI MASAO , NIWA KEIKO , TERAI KIYOHISA , IKUTA SAKAE , TAMAGAWA TORU , MIURA HIROSHI
IPC分类号： G01R15/24 , G01R19/00 , G02F1/09
摘要： PURPOSE:To provide a superior optical current transformer capable of correcting the variation of a light quantity due to the vibration and executing the current measurement with high accuracy. CONSTITUTION:A measurement light from a first laser diode 1 is subjected to the linear polarization by a polarizer 2. A second laser diode 11 emits a random polarization light of which wavelength is different from that of the measurement light. The measurement light and reference light are coupled with each other by a beam-coupling device 12 to be allowed to fall on a Faraday element 3. A light getting a Faraday optical rotation at the Faraday element 3 is divided into two polarization components by an analyzer 5, then each is divided into the measurement light and reference light by a two- wavelength divider 14 to be converted to respective electric signals by a photodiode 6. Each of the electric signals of the measurement light and reference light is sequentially operated by an amplifier 16, a subtracter 8, an AGC amplifier 7 and an electronic circuit 17, thereby obtaining a measurement current value in which the variation of the optical quantity due to the vibration is roughly corrected.

3. 发明专利

JPH07333256A OPTICAL CURRENT TRANSFORMER 失效
公开(公告)号：JPH07333256A
公开(公告)日：1995-12-22
申请号：JP12749694
申请日：1994-06-09
申请人： TOSHIBA CORP
发明人： IKUTA SAKAE , TAMAGAWA TORU , TAKAHASHI MASAO , TERAI KIYOHISA , MIURA HIROSHI , NIWA KEIKO
IPC分类号： G01R15/24 , G01R19/00 , G02F1/09
摘要： PURPOSE:To provide a superior optical current transformer wherein drift of an optical axis and fluctuation of a space beam with respect to the temperature variation does not occur, the high accuracy can be stably maintained and it can be used in a power system of heavy current CONSTITUTION:A transmission optical fiber 1 and a lens 2 are united with each other by a bonding member 31 to form a fiber-lens assembly body 32. A sensor is wound around a conductor 9 to be measured to form a sensing optical fiber 34. Lenses 2 are provided to each of the input and output ends of the sensing optical fiber 34 and are united thereto by bonding members 31 to form respective fiber-lens assembly bodies 36. An optical system housing box 37 houses the fiber-lens assembly bodies 32, 36, a polarizer 3 and an analyzer 5 such that they are directly fixed thereto to form optical passages of the optical system. The optical system housing box 37 is made of a material of which thermal expansion coefficient is lower than that of each of the optical elements.

4. 发明专利

JPH07280902A OPTICAL-FIBER SENSOR AND ITS MANUFACTURE 失效
公开(公告)号：JPH07280902A
公开(公告)日：1995-10-27
申请号：JP7609994
申请日：1994-04-14
申请人： TOSHIBA CORP
发明人： MIURA HIROSHI , TAMAGAWA TORU , IKUTA SAKAE , TERAI KIYOHISA , TAKAHASHI MASAO , NIWA KEIKO
IPC分类号： G01R33/032 , G01R15/24 , G02B6/00 , G02F1/09
摘要： PURPOSE:To obtain an optical-fiber sensor whose refractive index is small and which increases the accuracy of the measurement of a magnetic field without being affected by surroundings by forming a plurality of grooves on the outer circumferential face of a bobbin and inserting elastic holding bodies which bond and hold optical fibers, into the grooves so as to be fixed. CONSTITUTION:A plurality of U-shaped grooves 12 are formed on the outer circumference of a bobbin 11 along the peripheral face. Elastic holding bodies 13 are formed out of a silicone rubber which is inserted into the grooves 12, whose shape is identical to the shape of the grooves and which is provided with a heat-resistant property and a flexible property, and fiber holes 15 into which optical fibers 14 can be inserted, are formed in every central part. Breaks 16 which are passed to every upper edge from the fiber holes 15 are formed. While the optical fibers 14 are being twisted, they are inserted into the fiber holes 15 through the breaks 16 in the holding bodies 13 in the grooves 12, and, in this state, the holding bodies 13 are inserted up to the bottom part of the grooves 12. The holding bodies 13 are arranged at equal intervals on the outer circumference of the bobbin 11. The holes 15 and the breaks 16 are coated with a silicone rubber-based adhesive 17 so as to be thin and uniform, and also every inner-face side corresponding to the grooves 12 is coated with the adhesive. Every interval 18h is set at a size at which a stress due to the difference portion in thermal expansion between the bobbin 11 and the optical fibers 14 is not generated.

5. 发明专利

JPH07167931A OPTICAL FIBER SENSOR DEVICE 失效
公开(公告)号：JPH07167931A
公开(公告)日：1995-07-04
申请号：JP31391593
申请日：1993-12-15
申请人： TOSHIBA CORP
发明人： MIURA HIROSHI , TAMAGAWA TORU , IKUTA SAKAE , TERAI KIYOHISA , TAKAHASHI MASAO , NIWA KEIKO
IPC分类号： G01R33/032 , G01R15/24 , G02B6/00 , G02B26/08
摘要： PURPOSE:To provide an optical fiber sensor device excellent in practical application, in which complex refraction of optical fiber is small, by furnishing a circumferential groove at the periphery of a non-magnetic ring-shaped member, and winding a twined optical fiber on resilient pieces fastened into the groove. CONSTITUTION:To wind an optical fiber 1 in loop form, a groove 7 for insertion of the optical fiber 1 is furnished at the peripheral surface of a bobbin 5 as a, non-magnetic ring-shaped member. To the bottom of this groove 7, resilient pieces 6 are adhered at even intervals circumferentially. The optical fiber 1 is twined and inserted into this groove 7 while given a controlled tension. Because therein the optical fiber 1 lifts the resilient pieces 6 a little, the twine of the fiber is held by the friction of their contacting surfaces involving a repulsive force. The roles of the resilient pieces 6 are to separate the optical fiber 1 from the groove 7, absorb and relieve the tensile stress in the optical fiber 1 produced thermal expansion and contraction, and prevent generation of detrimental stresses resulting from the fiber touching the groove 7 which is hard.

6. 发明专利

JP2004069710A Optical application measuring apparatus and optical application electric current measuring apparatus 审中-公开
公开(公告)号：JP2004069710A
公开(公告)日：2004-03-04
申请号：JP2003300811
申请日：2003-08-26
申请人： Toshiba Corp , 株式会社東芝
发明人： IKUTA SAKAE , TERAI KIYOHISA , TAKAHASHI MASAO , NIWA KEIKO
IPC分类号： G01R15/24 , G01M11/00
摘要： PROBLEM TO BE SOLVED: To provide a practical optical application measuring apparatus and an optical application electric current measuring apparatus having high precision and moreover stability over a long term. SOLUTION: An optical system includes a collimator of a transmission fiber 3, a polarizer 4, a sensor fiber 5 and a collimator thereof, an analyzer 7, and a collimator of a receiving fiber 8. The optical components, except the sensor fiber 5, are housed in an optical system housing box 21. A fiber connector 15, constituting each collimator, a mounting member 16 constituting the collimators of the transmitting fiber 3 and the receiving fiber 8, a lens holder 22 constituting the collimator of the sensor fiber 5, an adjustment sleeve 23, fixing members such as a connector holder 24, and the optical system housing box 21 are made of nickel alloy steel with a nickel content of 30 to 40%. The parts between each fixing member and between each fixing member and the optical system housing box 21 are fixed by laser welding (a laser welding part WL). COPYRIGHT: (C)2004,JPO

7. 发明专利

JPH08201440A OPTICAL CURRENT TRANSFORMER AND ITS MANUFACTURE 失效
公开(公告)号：JPH08201440A
公开(公告)日：1996-08-09
申请号：JP1111695
申请日：1995-01-27
申请人： TOSHIBA CORP
发明人： MIURA HIROSHI , TAMAGAWA TORU , TERAI KIYOHISA , TAKAHASHI MASAO , IKUTA SAKAE , NIWA KEIKO , SAITO MINORU
IPC分类号： G01R15/24 , G02B6/00 , H02B13/065
摘要： PURPOSE: To measure an electric current with high accuracy even under a bad condition by airtightly inserting a rod lens into the through hole of an airtight optical connector so that light can be introduced to an arithmetic and output section. CONSTITUTION: A rod lens 29 made of low-strain glass is inserted into a through hole 19 and fixed with an adhesive 20. Since the low-strain glass which is optical glass produced by eliminating residual stresses from the inside of the glass by performing annealing, etc., is used for the lens 29, the occurrence of the double refraction of light can be suppressed to an extremely low level. Since the rod lens 29, in addition, is formed by uniting a lens and glass rod in one body, excellent optical coupling can be obtained when the optical axis of the lens 29 is aligned with that of a capillary section 22, because light is condensed to an optical fiber 23. In addition, the lens 29 has a high vibration resistance and impact resistance. When a silicone rubber adhesive having a Young's modulus of 0.05-100 kg/mm is used as the sticking means between the lens 29 and connector 8, the accuracy of an optical current transformer can be improved further, because the impact, vibration, thermal stress, etc., impressed upon the transformer are absorbed by the elasticity of the adhesive.

8. 发明专利

JPH0850212A OPTICAL FIBER AND ITS PRODUCTION 失效
公开(公告)号：JPH0850212A
公开(公告)日：1996-02-20
申请号：JP18446094
申请日：1994-08-05
申请人： TOSHIBA CORP
发明人： TAKAHASHI MASAO , NIWA KEIKO , TERAI KIYOHISA , IKUTA SAKAE , TAMAGAWA TORU , MIURA HIROSHI
IPC分类号： G02B6/02 , G02B6/10
摘要： PURPOSE:To obtain an optical fiber having an end reflection mirror improved in durability by subjecting the end at the core end of an optical fiber together with an adapter to end face polishing and forming a light reflection film at the polished end face. CONSTITUTION:After a projective film 2 the axial direction of the optical fiber core 1 is removed, the optical fiber core 1 is inserted into the adapter 3 of the bore slightly larger than the bore of the optical fiber core 1 and is joined to the adapter 3. The end face is thereafter polished together with the adapter 3 and the reflection mirror deposited with a reflection film 5 by evaporation is stuck by adhesion to the end face at the rear. As a result, the vapor deposition on the bulk material having the larger bore is made possible and since the coating at a high temp. is possible, the durability of the reflection film 5 is greatly improved at the time of forming the reflection film 5. The need for using an adhesive on an optical path is eliminated by using the adapter 3 and adhering the adapter 3 to the reflection film 5 and, therefore, the optical fiber is hardly affected by the deterioration of the adhesive with lapse of time.

9. 发明专利

JPH07234252A OPTICAL CURRENT MEASURING DEVICE 失效
公开(公告)号：JPH07234252A
公开(公告)日：1995-09-05
申请号：JP2710894
申请日：1994-02-25
申请人： TOSHIBA CORP
发明人： MIURA HIROSHI , TAMAGAWA TORU , IKUTA SAKAE , TERAI KIYOHISA , TAKAHASHI MASAO , NIWA KEIKO
IPC分类号： G01R15/24
摘要： PURPOSE:To provide an optical current measuring device whose measuring accuracy is enhanced. CONSTITUTION:A plurality of cylindrical, metallic tanks 1 are joined together via flanges provided at the end of each tank 1, and a current-carrying conductor 2 is disposed along the axis of the metallic tanks l, and the tanks 1 are each filled with an insulating gas and a current that the current-carrying conductor 2 carries is measured by detecting the polarized state of light passing through an optical fiber 11 going around the current-carrying conductor 2. A cylindrical shield 17, disposed in such a way as to allow the current-carrying conductor 2 to pass through it, and having a flange at its end that is joined between the metallic tank flanges, is provided inside each metallic tank 1, and an insulating or nonmagnetic ring-shaped member is disposed between the outer surface of the cylindrical shield 17 and the inner surface of each metallic tank 1 via a cushioning material 18 in such a way as to surround the current- carrying conductor 2. A groove circling the outer peripheral surface of the ring-shaped member is provided and the optical fiber 11 is secured in the groove, with the end of the optical fiber 11 connected to predetermined optical equipment provided outside the tanks 1, and the ring-shaped member is held in place via an elastic member 20 disposed between the ring-shaped member and the inner surface of each metallic tank 1.

10. 发明专利

JPH07209338A OPTICAL CURRENT MEASUREMENT DEVICE 失效
公开(公告)号：JPH07209338A
公开(公告)日：1995-08-11
申请号：JP107394
申请日：1994-01-11
申请人： TOSHIBA CORP
发明人： TERAI KIYOHISA , TAMAGAWA TORU , TAKAHASHI MASAO , IKUTA SAKAE , NIWA KEIKO , MIURA HIROSHI
IPC分类号： G01R15/24
摘要： PURPOSE:To measure electric current with precision even in the atmosphere with large vibration and fluctuation in temperature by assigning an annular insulation member between end part flanges of a tubular tank and then winding and fixing the periphery of the member with an optical fiber. CONSTITUTION:At the seam of a GIS tank 1, an insulation spacer for fixing a sensing fiber 23 is attached, and on the upper surface of the insulation spacer, an insulation cover 31 for protecting a fiber 23 is attached with a space 23 kept. Further, above the cover 31, with an insulation material 33 in between, a conductive cover 34 encloses it so that the both parts of the tank 1 are connected. Further, outside the tank 1, a sensing fiber part 11 is so arranged that it encloses the conductor 2, and a light emitting fiber 12 and a photo-detecting fiber 13 extend from the fiber part 11, connected to a light source 14 and a detector 15, respectively. The output signal of detector 15 is calculated by a signal processor circuit 16, and its result is outputted from an output terminal 17.

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