GB1233822A - An electric current monitoring device - Google Patents
An electric current monitoring deviceInfo
- Publication number
- GB1233822A GB1233822A GB1233822DA GB1233822A GB 1233822 A GB1233822 A GB 1233822A GB 1233822D A GB1233822D A GB 1233822DA GB 1233822 A GB1233822 A GB 1233822A
- Authority
- GB
- United Kingdom
- Prior art keywords
- current
- mirror
- rod
- light
- responsive
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/24—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices
- G01R15/248—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices using a constant light source and electro-mechanically driven deflectors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
- H01S3/139—Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling the mutual position or the reflecting properties of the reflectors of the cavity, e.g. by controlling the cavity length
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Lasers (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
1,233,822. 822. Current and magnetic field measurement. COMPAGNIE GENERALE D'ELECTRICITE. Feb.26, 1969 [Feb.27, 1968; Oct.3, 1968; Dec.3, 1968], No.10248/69. Headings GIA, G1N and G1U. In an electric current transforming arrangement a magnetostrictive rod is placed in the field of the current to be transformed or measured and has a mirror (grating or diffuser) mounted thereon whereby light from a source falling on a detector is modulated by changes in the current. The line conductor may be looped into one or more turns and the rod may be polarized by a coil or a permanent magnet, the former of which may be energized by A. C. for the apparatus to serve as a D.C. transformer. Two identical rods one of which is screened from the magnetic field may be used for temperature compensation and the rods which may be cylindrical may be interconnected by a good heat conductor. In a null arrangement Fig. light from a source 2 which may be a sodium vapour lamp or a laser is split by a mirror 3 and supplied to a pair of interferometers 4, 5 the former having a mirror carried by a rod responsive to the current to be transformed and the latter having a similar rod responsive to a field proportional to the error current developed by a comparison in unit 6 of the two interferometer outputs. The current affecting the rod in interferometer 4 may be indicated by ammeter 8. The use of Michelson, Twyman Green, Fabry- Perot and Jamin interferometers is referred to and in a null system described with reference to Fig.4 (not shown) the output light from one current responsive interferometer arrangement is applied to a succeeding differential pair having a common nulling coil around a magnetostrictive rod. Embodiments in which the rod is a tube surrounding the conductor and is supported at one of its ends or at its centre are also described, the tube carrying at its free end or ends a concave mirror and deforming torsionally with changes of current. Further arrangements in which the movable mirror is rotated relative to the fixed mirror or in which the two mirrors are rotated and the light source is a particular wavelength or group of wavelengths have light guides and a vibrating slot aperture whereby pulses corresponding to the number of fringes may be counted. In a further null method Fig.10 in which mirror 142 is mounted on the magnetostrictive rod, the light from mirror 142 is split by a separator 143 and the compensating wedge 147 is adjusted to maintain equality of pulses directed alternately by a mixer 150 on to a photo-cell 152. A further embodiment uses variations in the reflection of diffused light and two still further embodiments are directed to the automatic control of the output power of a laser by a permanent magnet biased rod carrying a mirror in the beam path in which the current derived by a photo-cell from the beam is passed through the rod itself.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR141470 | 1968-02-27 | ||
FR168688A FR94992E (en) | 1968-02-27 | 1968-10-03 | Optical link current transformer. |
FR176293 | 1968-12-03 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1233822A true GB1233822A (en) | 1971-06-03 |
Family
ID=27244795
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1233822D Expired GB1233822A (en) | 1968-02-27 | 1969-02-26 | An electric current monitoring device |
Country Status (5)
Country | Link |
---|---|
BE (1) | BE728485A (en) |
CH (2) | CH498400A (en) |
DE (1) | DE1909671A1 (en) |
GB (1) | GB1233822A (en) |
NL (1) | NL6902975A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112014623A (en) * | 2020-09-01 | 2020-12-01 | 上海艾为电子技术股份有限公司 | Current sampling circuit and power supply converter |
CN113049867A (en) * | 2019-12-26 | 2021-06-29 | 通用电器技术有限公司 | Measuring device for measuring a DC component of a current and associated measuring method |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3504945A1 (en) * | 1984-05-24 | 1985-11-28 | MITEC Moderne Industrietechnik GmbH, 8012 Ottobrunn | ARRANGEMENT FOR MEASURING THE ELECTRICAL VOLTAGE PARAMETERS OF A HIGH VOLTAGE LADDER |
DE3509356A1 (en) * | 1985-03-15 | 1989-08-10 | Licentia Gmbh | Method and arrangement for detecting electromagnetic waves |
-
1969
- 1969-02-17 BE BE728485A patent/BE728485A/xx unknown
- 1969-02-18 CH CH240369A patent/CH498400A/en not_active IP Right Cessation
- 1969-02-18 CH CH770A patent/CH499215A/en not_active IP Right Cessation
- 1969-02-26 GB GB1233822D patent/GB1233822A/en not_active Expired
- 1969-02-26 NL NL6902975A patent/NL6902975A/xx unknown
- 1969-02-26 DE DE19691909671 patent/DE1909671A1/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113049867A (en) * | 2019-12-26 | 2021-06-29 | 通用电器技术有限公司 | Measuring device for measuring a DC component of a current and associated measuring method |
CN113049867B (en) * | 2019-12-26 | 2024-05-28 | 通用电器技术有限公司 | Measuring device for measuring DC component of current and associated measuring method |
CN112014623A (en) * | 2020-09-01 | 2020-12-01 | 上海艾为电子技术股份有限公司 | Current sampling circuit and power supply converter |
CN112014623B (en) * | 2020-09-01 | 2023-05-23 | 上海艾为电子技术股份有限公司 | Current sampling circuit and power supply changer |
Also Published As
Publication number | Publication date |
---|---|
BE728485A (en) | 1969-08-18 |
NL6902975A (en) | 1969-08-29 |
DE1909671A1 (en) | 1969-09-18 |
CH498400A (en) | 1970-10-31 |
CH499215A (en) | 1970-11-15 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
CSNS | Application of which complete specification have been accepted and published, but patent is not sealed |