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1. 发明专利

JPS6341804A OIL LEAKAGE DETECTING OPTICAL FIBER SENSOR AND ITS USING METHOD 失效
公开(公告)号：JPS6341804A
公开(公告)日：1988-02-23
申请号：JP18529686
申请日：1986-08-08
申请人： JAPAN STEEL & TUBE CONSTR , ONO YUTAKA
发明人： TANE AKIRA , KOSUGE TAKU , ONO YUTAKA
IPC分类号： G02B6/02 , G01M3/38
摘要： PURPOSE:To improve the detecting sensitivity of a liquid to be detected by setting up the diffractive index of a core part to a value higher than that of the liquid and setting up the diffractive index of a clad part to a value lower than that of the liquid. CONSTITUTION:In an oil leakage detecting optical fiber sensor provided with a cylindrical core part 1 and a clad part 2 surrounding the core part 1 over a semi-circle to detect a liquid to be detected, the diffractive index of the core part 1 is set up to a value higher than that of the liquid to be detected, on the contrary that of clad 2 is lower than that of liquid. Light with a propagation angle >= a critical propagation angle determined by the refractive indexes of the liquid and the core part 1 is mainly made incident on the sensor 5. Consequently, jet fuel or the like used as the liquid to be detected can be detected with high sensitivity.

2. 发明专利

JPS62293132A OPTICAL FIBER SENSOR FOR LEAK DETECTION 失效
公开(公告)号：JPS62293132A
公开(公告)日：1987-12-19
申请号：JP13614586
申请日：1986-06-13
申请人： JAPAN STEEL & TUBE CONSTR , ONO YUTAKA
发明人： TANE AKIRA , ONO YUTAKA , YOSHIKAWA HIROSHI , KOSUGE TAKU
IPC分类号： G02B6/02 , G01M3/04 , G01M3/38
摘要： PURPOSE:To detect leaking oil, etc., to the overall length of an optical fiber by providing a columnar clad part, a core part which is formed eccentrically with the center of the clad part, and a detection space nearby the core part. CONSTITUTION:The core part 12 is formed linearly and eccentrically with the center of the clad part 11. A leak detecting photosensor part 13 is provided on the surface of the clad part 11 to the overall length of the optical fiber and the shortest distance between the outer peripheral surface of the core part l2 and the outer peripheral surface of the clad part 11 is set a little bit smaller than the minimum thickness of the clad part 11 with which light propagated in the optical fiber does not leaks out, i.e. evanescent wave thickness (t). Here, if liquid having a higher refractive index than the core part 12, e.g. leaking oil sticks on a certain place of the sensor 13, light in propagation mode expected to be reflected at a certain angle and propagated in the absence of the oil is converted to a leak mode at the leaking oil sticking part in the core 12 and leaks out. Hence, a light pulse tester is used to measure backscattered light, and then the time and position of the leak occurrence are detected.

3. 发明专利

JPS62250324A OPTICAL FIBER SENSOR FOR DETECTING LEAKAGE 失效
公开(公告)号：JPS62250324A
公开(公告)日：1987-10-31
申请号：JP9222486
申请日：1986-04-23
申请人： JAPAN STEEL & TUBE CONSTR , ONO YUTAKA
发明人： TANE AKIRA , KOSUGE TAKU , ONO YUTAKA , YOSHIKAWA HIROSHI
IPC分类号： G02B6/02 , G01M3/04 , G01M3/38
摘要： PURPOSE:To detect a leakage when a liquid having a high refractive index such as oil is adhered without lowering a detection sensitivity, by forming a concentric cylindrical high refractive index part, of which the refractive index is made higher than that of a first low refractive index part, to the outer periphery of the first low refractive index part. CONSTITUTION:In this optical fiber sensor for detecting a leakage, a leakage detecting optical sensor part 14 is continuously formed to an optical fiber over the entire length thereof and, when a liquid having a refractive index higher than that of a concentric cylindrical high refractive index part 12, for example, leaked oil is adhered to the outer peripheral surface of the concentric cylindrical high refractive index part 12, light of a propagation mode reflected at a certain angle to have to propagate when there is no oil at the leaked oil adhered part of the high refractive index part 12 is converted to a leakage mode to leak to the outside. Therefore, if back scattering light due to said leaked light is measured using a light pulse tester, leak generating time and position can be detected. Further, because this optical fiber sensor is constituted so as to take in the light of a high order mode coming to the leakage mode, the quantity of light bringing about the leakage mode becomes much and leakage detection sensitivity is enhanced as compared with a conventional one.

4. 发明专利

JPS62115349A METHOD AND DEVICE FOR ABNORMALITY DETECTION BY OPTICAL FIBER 失效
公开(公告)号：JPS62115349A
公开(公告)日：1987-05-27
申请号：JP25379485
申请日：1985-11-14
申请人： JAPAN STEEL & TUBE CONSTR , ONO YUTAKA
发明人： TANE AKIRA , ONO YUTAKA , KOSUGE TAKU
IPC分类号： G01N21/84 , G01B11/16 , G01K11/12 , G01N21/88 , G02B6/00 , G08B17/00
摘要： PURPOSE:To detect a position where abnormality occurs automatically and accurately by light receiving the return light or transmitted light of continuous light sent out with low output to an optical fiber and judging abnormality, and then light receiving the return light of light pulses sent out thereafter. CONSTITUTION:The continuous light with constant output is sent out of a light emitting body 51 to the optical fiber 2 which has sensors 3 made of shape memory allow at a specific part and its return or transmitted light is received and converted 55 photoelectrically into the light receiving intensity, which is compared with reference light receiving intensity stored in a memory 75. If the abnormality is judged, an abnormality detection signal which is the output of a comparative decision circuit 77 is sent to the 1st and the 2nd switching means 79 and 81, which are switched automatically to the sides of a pulse oscillator 52 and the 1st logarithmic A/D converter 56. Then, the return light of light pulses transmitted from the light emitting body 51 to the optical fiber 2 is inputted to a photoelectric transducer 55 through a directional coupler 53 and A/D-converted 56. Then, light receiving data stored in a buffer memory 59 is processed by an abnormal position detecting circuit 60 to detect the position where the abnormality occurs automatically and accurately.

5. 发明专利

JPS6344609A OPTICAL FIBER INCIDENCE DEVICE 失效
公开(公告)号：JPS6344609A
公开(公告)日：1988-02-25
申请号：JP18859986
申请日：1986-08-13
申请人： JAPAN STEEL & TUBE CONSTR , ONO YUTAKA
发明人： TANE AKIRA , KOSUGE TAKU , ONO YUTAKA
IPC分类号： G02B6/00 , G02B6/42
摘要： PURPOSE:To improve oil leak detection sensitivity by providing a rotary fine adjusting table and a position fine adjusting table and making light which has an optional propagation angle incident on an optical fiber. CONSTITUTION:An optical fiber sensor 20 is set at a proper position by adjusting the front-rear setters 15, up-down setter 16, and right-left setter 17 which constitute the position fine adjusting table. The center of the core part 1 of an end surface 6 of the optical fiber sensor 20 is aligned with the center of rotation of a turntable 11a by said setting and a parallel light beam 19 emitted by a laser unit 13 set at a proper rotational position by the turntable 11a is incident on the end surface 6. Consequently, the light which has a proper propagation angle is incident on the optical fiber sensor 20 and the sensitivity of oil detection is improved.

6. 发明专利

JPS6247531A OPTICAL FIBER SENSOR FOR DETECTING LEAKAGE AND ITS MANUFACTURE 失效
公开(公告)号：JPS6247531A
公开(公告)日：1987-03-02
申请号：JP18656585
申请日：1985-08-27
申请人： JAPAN STEEL & TUBE CONSTR , ONO YUTAKA
发明人： TANE AKIRA , ARAKI MUTSURO , KOSUGE TAKU , ONO YUTAKA
IPC分类号： G02B6/00 , C03B37/012 , G01M3/04 , G01M3/38 , G02B6/02
摘要： PURPOSE:To improve the detecting sensitivity by constituting an optical fiber sensor, of a core part of a helical shape and a clad part for surrounding said part, and providing a sensor part extending over the overall length, which has formed the shortest distance of the outside peripheral surface of both of them to a specified thickness of below. CONSTITUTION:The periphery of a core part 12 which has been formed to a helical shape is surrounded by a clad part 11, and the shortest distance between a part of the outside peripheral surface of the core part 12 and the clad part 11 is formed to an evanescent wavelength thickness (t), and a sensor part 13 extending over the overall length of an optical fiber is constituted. When a leak oil adheres to a part of the clad part 11, light of a propagation mode is converted to a leakage mode and leaks to the outside, therefore, when its backscattering light is measured by using an optical pulse tester, a generation time and a generated position of the leakage can be detected. Also, in case the leak oil has adhered to two parts or more, the light of the propagation mode of a different angle becomes a leakage mode in the rear, and the leak oil can be detected without deteriorating the detecting sensitivity of the leak oil of the rear.

7. 发明专利

JPS61120295A Controller for disaster prevention system 失效
标题翻译：灾害预防系统控制器
公开(公告)号：JPS61120295A
公开(公告)日：1986-06-07
申请号：JP24079084
申请日：1984-11-16
申请人： Japan Steel & Tube Constr , Yutaka Ono
发明人： TANE AKIRA , ONO YUTAKA
IPC分类号： G08B17/00

8. 发明专利

JPS61115197A Temperature detector for disaster prevention system 失效
标题翻译：用于灾害预防系统的温度探测器
公开(公告)号：JPS61115197A
公开(公告)日：1986-06-02
申请号：JP23524884
申请日：1984-11-09
申请人： Japan Steel & Tube Constr , Yutaka Ono
发明人： TANE AKIRA , ONO YUTAKA
IPC分类号： G01D21/00 , G01M11/00 , G01R31/08 , G08B17/02

9. 发明专利

JPH10185963A CURRENT MEASURING DEVICE USING FARADAY EFFECT OPTICAL FIBER 失效
公开(公告)号：JPH10185963A
公开(公告)日：1998-07-14
申请号：JP35040896
申请日：1996-12-27
申请人： ASAHI DENSHI KK , ONO YUTAKA
发明人： WATANABE SAKAE , SATO JUN , ONO YUTAKA
IPC分类号： G01R33/032 , G01R15/24 , G01R19/00
摘要： PROBLEM TO BE SOLVED: To eliminate necessity of treating an energized part for measurement by simplifying the fixing and removing of sensor part to the part of the energized part for measurement (bus). SOLUTION: A forward path 4F and a return path 4R are bent in U-shape. The U-shaped space 4U formed by the forward path 4F and the return path 4R is set as a position to arrange a bus 1. To the return path 4R, a pipe 5 with a high permeability is placed around to magnetically shield. Thus simply by arranging a sensor from one side of the bus 1 fixing and removal of the sensor part to the bus 1 become very easy. Furthermore, it is unnecessary to cut the bus 1, so there is no fear of damaging the reliability of the bus 1, such as heating and imperfect contact, and it becomes economical.

10. 发明专利

JPH09292415A PHOTOELECTRIC AND MAGNETIC SENSOR 失效
公开(公告)号：JPH09292415A
公开(公告)日：1997-11-11
申请号：JP10919496
申请日：1996-04-30
申请人： ASAHI DENSHI KK , ONO YUTAKA
发明人： SUGANO SHUJI , YOSHIDA TETSURO , SAITO YUJI , ONO YUTAKA
IPC分类号： G01R33/02 , G01R15/24 , G01R33/032
摘要： PROBLEM TO BE SOLVED: To enable assembling easily in a short time and lowering cost by making an expensive cabinet unnecessary. SOLUTION: Electrods 19-1 and 19-2 are provided at opposing locations to sandwich an electro-optic element 15. In this case, the electrode 19-2 serves as a substrate and the electro-optic element 15, a polarizer 13, wavelength plate 14, an analyzer 16 and optical lenses 12 and 17 are provided on this substrate. A photosensor comprising body formed of these electro-optic element 15, electrodes 19-1, 19-2, polarizer 13, wavelength plate 14, analyzer 16 and optical lenses 12 and 17 are coated with a UV-curing resin and covered with a heat-shrinkable tube 20 which is heat shrunk. At this time, the heat-shrinkable tube 20 is filled with an insulating gas.

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