US4891579A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Voltage detector
Assignee: Hamamatsu Photonics KK
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Filing: 1988-06-29
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Granted: 1990-01-02
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Expires: 2008-06-29
Abstract
Abstract A voltage detector detects and indicates simultaneously the voltage levels at a plurality of parts of an object to be measured. A probe formed of electrooptic material having a refractive index changed in the presence of a voltage placed near the object and beams of polarized light are transmitted through the probe and reflected by a polarized beam splitter to a detector for indicating the voltage levels at the parts of the object.
Inventors
- 👤 Shinichiro Aoshima
- 👤 Yutaka Tsuchiya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:36
CPC Classifications
G; G01; G01R; G01R15/00; G01R15/14; G01R15/24; G01R15/241; G01R15/242; G01R1/00; G01R1/02; G01R1/06; G01R1/067; G01R1/07; G01R1/071; G01R31/00; G01R31/28; G01R31/302; G01R31/308
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
130 words
A voltage detector for detecting the voltage at the parts of an object to be measured, comprising: an electro-optic material having a plurality of portions whose refractive indexes are changed according to the voltages at a corresponding plurality of parts of said object, respectively; means for applying parallel light beams having a first predetermined polarization component to said electro-optic material, the polarizations of said parallel light beams applied to said electro-optic material being changed according to said refractive indexes of said plurality of portions; and guide means for extracting emergent light beams having a second predetermined polarization component from a plurality of emergent light beams which emerge from said electro-optic material, and applying said emergent light beams having said second predetermined polarization component to a photo-electric detector in parallel, one-dimensionally.
Claim 2
Dependent Claim
130 words
A voltage detector for detecting the voltage at the parts of an object to be measured, comprising: an electro-optic material having a plurality of portions whose refractive indexes are changed according to the voltages at a corresponding plurality of parts of said object, respectively; means for applying parallel light beams having a first predetermined polarization component to said electro-optic material, the polarizations of said parallel light beams applied to said electro-optic material being changed according to said refractive indexes of said plurality of portions; and guide means for extracting emergent light beams having a second predetermined polarization component from a plurality of emergent light beams which emerge from said electro-optic material, and applying said emergent light beams having said second predetermined polarization component to a photo-electric detector in parallel, one-dimensionally.
Claim 3
Dependent Claim
25 words
A voltage detector as claimed in claim 1, wherein said light beams are CW light beams, and said photoelectric detector is a high-speed response detector.
Claim 4
Dependent Claim
17 words
A voltage detector as claimed in claim 2, wherein said high-speed response detector is a streak camera.
Claim 5
Dependent Claim
19 words
A voltage detector as claimed in claim 2, wherein said high-speed response detector comprises a plurality of avalanche photo-diodes.
Claim 6
Dependent Claim
19 words
A voltage detector as claimed in claim 2, wherein said high-speed response detector comprises a plurality of PIN photo-diodes.
Claim 7
Dependent Claim
30 words
A voltage detector as claimed in claim 1, wherein said light beams are pulsed light beams, and said photoelectric detector comprises a CCD camera to accomplish voltage detection by sampling.
Claim 8
Dependent Claim
31 words
A voltage detector as claimed in claim 1, wherein said light beams are pulsed light beams, and said photoelectric detector comprises a plurality of photo-diodes to accomplish voltage detection by sampling.
Claim 9
Dependent Claim
132 words
A voltage detector for detector for detecting the voltage at the parts of an object to be measured, comprising: an electro-optic material having a plurality of portions whose refractive indexes are changed according to the voltages at a corresponding plurality of parts of said object, respectively; means for applying parallel light beams having a first predetermined polarization component to said electro-optic material, the polarizations of said parallel light beams applied to said electro-optic material being changed according to said refractive indexes of said plurality of portions; and guide means for extracting emergent light beams having a second predetermined polarization component from a plurality of emergent light beams which emerge from said electro-optic material, and applying said emergent light beams having said second predetermined polarization component to a photo-electric detector in parallel, two-dimensionally.
Claim 10
Dependent Claim
132 words
A voltage detector for detector for detecting the voltage at the parts of an object to be measured, comprising: an electro-optic material having a plurality of portions whose refractive indexes are changed according to the voltages at a corresponding plurality of parts of said object, respectively; means for applying parallel light beams having a first predetermined polarization component to said electro-optic material, the polarizations of said parallel light beams applied to said electro-optic material being changed according to said refractive indexes of said plurality of portions; and guide means for extracting emergent light beams having a second predetermined polarization component from a plurality of emergent light beams which emerge from said electro-optic material, and applying said emergent light beams having said second predetermined polarization component to a photo-electric detector in parallel, two-dimensionally.
Claim 11
Dependent Claim
25 words
A voltage detector as claimed in claim 8, wherein said light beams are CW light beams, and said photo-electric detector is a high-speed response detector.
Claim 12
Dependent Claim
17 words
A voltage detector as claimed in claim 9, wherein said high-speed response detector is a streak camera.
Claim 13
Dependent Claim
19 words
A voltage detector as claimed in claim 9, wherein said high-speed response detector comprises a plurality of avalanche photo-diodes.
Claim 14
Dependent Claim
19 words
A voltage detector as claimed in claim 9, wherein said high-speed response detector comprises a plurality of PIN photodiodes.
Claim 15
Dependent Claim
30 words
A voltage detector as claimed in claim 8, wherein said light beams are pulsed light beams, and said photo-electric detector comprises a CCD camera to accomplish voltage detection by sampling.
Claim 16
Dependent Claim
31 words
A voltage detector as claimed in claim 8, wherein said light beams are pulsed light beams, and said photo-electric detector comprises a plurality of photo-diodes to accomplish voltage detection by sampling.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-01-01 | 1993-07-03 | 1994-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-01 | 1997-07-03 | 1998-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-01 | 2001-07-03 | 2002-01-02 | $7700.00 | Window Closed / Lapsed |