IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0052775
(2002-01-23)
|
우선권정보 |
JP-0014142 (2001-01-23) |
발명자
/ 주소 |
- Tateishi, Ichiro
- Nishikawa, Hisashi
- Ichimura, Takashi
- Fukui, Satoru
- Nakade, Yoshiyuki
- Onishi, Masahide
|
출원인 / 주소 |
- Matsushita Electric Industrial Co., Ltd.
|
대리인 / 주소 |
Wenderoth, Lind & Ponack L.L.P.
|
인용정보 |
피인용 횟수 :
7 인용 특허 :
3 |
초록
▼
In a rotation-angle detector, a first detector detects a movement of a driven body following the rotation of a change gear engaged with a rotary gear of a rotary body, and outputs the detection result as a detection signal which gradually increases or decreases. At the same time, a second detector d
In a rotation-angle detector, a first detector detects a movement of a driven body following the rotation of a change gear engaged with a rotary gear of a rotary body, and outputs the detection result as a detection signal which gradually increases or decreases. At the same time, a second detector detects a rotation of a detecting gear engaged with the change gear or directly with the rotary gear of the rotary body and outputs the detection result as a detection signal which repeats continuously. A detecting circuit detects a rotation angle of the rotary body based on these two detection signals. This structure allows the rotation-angle detector to produce a smaller detection error, and be downsized. Further, only a simple calculation in the detecting circuit is necessary.
대표청구항
▼
In a rotation-angle detector, a first detector detects a movement of a driven body following the rotation of a change gear engaged with a rotary gear of a rotary body, and outputs the detection result as a detection signal which gradually increases or decreases. At the same time, a second detector d
In a rotation-angle detector, a first detector detects a movement of a driven body following the rotation of a change gear engaged with a rotary gear of a rotary body, and outputs the detection result as a detection signal which gradually increases or decreases. At the same time, a second detector detects a rotation of a detecting gear engaged with the change gear or directly with the rotary gear of the rotary body and outputs the detection result as a detection signal which repeats continuously. A detecting circuit detects a rotation angle of the rotary body based on these two detection signals. This structure allows the rotation-angle detector to produce a smaller detection error, and be downsized. Further, only a simple calculation in the detecting circuit is necessary. ical cable comprises multi-mode optical fiber. 13. The optical current transducer of claim 2, wherein the light source provides at least two distinct wavelengths of light. 14. The optical current transducer of claim 13, wherein the light source comprises at least two LEDs. 15. The optical current transducer of claim 13, wherein the light source comprises a halogen lamp. 16. The optical current transducer of claim 1, further comprising: at least one photodetector, receiving light from the analyzer. 17. The optical current transducer of claim 16, further comprising; a data collection apparatus, receiving an electrical signal from the at least one photodetector. 18. The optical current transducer of claim 1, wherein the magneto-optic garnet rotates the direction of polarization by an angle substantially represented by the relationship α=V(λ,T)Hd, where V is the temperature and wavelength dependent Verdet Constant, H is the component of a magnetic field generated by the current in the conductor that is perpendicular to the plane of the magneto-optic garnet, and d is the thickness of the active material. 19. A method of measuring current in a conductor, comprising: providing a single light source supplying light with at least a first, a second, and a third wavelength; communicating light from the light source to a polarizer configured to generate linearly polarized light; communicating the linearly polarized light from the polarizer to a magneto-optic garnet comprising Bismuth (Bi), Iron (Fe), and Oxygen (O), the magneto-optic garnet configured adjacent the conductor so that the magnetic field vector, caused by the conductor current, is perpendicular to the garnet film surface, the magneto-optic garnet configured to rotate the polarization of the linearly polarized light received from the polarizer; communicating the rotated light from the magneto-optic garnet to an analyzer in optical communication with the magneto-optic garnet, the analyzer configured to detect the rotation of the linearly polarized light caused by the magneto-optic garnet; and generating a temperature compensation factor for the magneto-optic garnet, based on light intensities of the first, and third second wavelengths. 20. The method of claim 19, further comprising; providing light from the analyzer to a first beam splitter. 21. The method of claim 20, further comprising: providing at least some of the light from the first beam splitter to a second beam splitter. 22. The method of claim 21, further comprising; receiving, by a detector a first light component from the first beam splitter and a second light component from the second beam splitter. 23. An optical current transducer configured to sense current in a conductor, comprising: a single light source supplying light with at least a first, a second, and a third wavelength; a sensor head, the sensor head including, a polarizer configured to generate linearly polarized light received from the light source; a magneto-optic garnet comprising Bismuth (Bi), Iron (Fe), and Oxygen (O), configured to be coupled to the conductor and in optical communication with the polarizer, the magneto-optic garnet configured to rotate the polarization of the linearly polarized light received from the polarizer, and an analyzer in optical communication with the magneto-optic garnet, the analyzer configured to detect the rotation of the linearly polarized light caused by the magneto-optic garnet; and a temperature compensation circuit for detecting sensor head temperature based on light intensities of the first second, and third wavelengths. 24. The optical current transducer of claim 23, wherein the sensor head is attached to the conductor. 25. The optical current transducer of claim 24, wherein the sensor head is attached to the conductor at a location on the conductor where the cross section of the conductor has the substantially smallest overall radius of curvature. 26. The optica
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