Method for magnetooptic current measurement and magnetooptic current-measuring device
US5834933A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 7, 1994 |
| Grant date | Nov 10, 1998 |
| Priority date | — |
| Expiry date | Dec 7, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R15/246
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Simple methods for magnetooptic current measurement and magnetooptic current-measuring devices are specified, which are independent of temperature influences on the measurement result and require no compensation device for the light intensity of light sources (LD1, LD2) employed. Light beams (1, 2) from the two laser light sources (LD1, LD2) are alternately polarized orthogonally relative to one another by means of a beam splitter (3), and are transmitted to light detectors (D.sub.A, D.sub.B) via collimators (4, 6), which are connected via a polarization-maintaining high-index birefringent HI fiber (5), through a magnetooptic current sensor (7), an analyzer (10), 2 collimators (11, 12) and multimode fibers (13) and (14). 1st and 2nd light output signals S.sub.A1 and S.sub.B1 as well as 3rd and 4th light output signals S.sub.A2 and S.sub.B2 are derived sequentially in time from the light detectors (D.sub.A, D.sub.B). A signal characterizer (232) of a control and evaluation device (15) is used to calculate a current intensity I detected by means of the magnetooptic current sensor (7), in accordance with I=S.sub.A1 .multidot.S.sub.B2 /(S.sub.A2 .multidot.S.sub.B1)-1!/(8.multidot.V), V…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.