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1. CA2771347 - FIBER OPTIC CURRENT SENSING SYSTEM WITH TEMPERATURE COMPENSATION

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[ EN ]
CLAIMS:
1. A fiber optic current sensing system comprising:
a fiber optic current transducer configured to sense a current flowing through an electrical conductor;
a temperature sensor configured to measure the operational temperature of the fiber optic current transduer; and
signal-processing electronics configured to adjust the sensed current measurement to substantially compensate for temperature induced errors associated with the sensed current measurement in response to the measured operational temperature of the fiber optic current transducer.
2. The fiber optic current sensing system according to claim 1, wherein the temperature sensor is configured to measure temperature at one or more discrete points along an optic fiber path.
3. The fiber optic current sensing system according to claim 1, wherein the temperature sensor is configured to measure temperature in a substantially
continuous path along an optic fiber.
4. The fiber optic current sensing system according to claim 1, wherein the fiber optic temperature sensor measurements are based on measurement techniques selected from fiber Bragg grating measurements, Raman scattering, Brillouin scattering, Fabry-Perot interferometric measurements, Mach-Zehnder interferometric measurements, Michelson interferometric measurements, Sagnac interferometric measurements, microbending measurements, macrobending measurements, polarimetric measurements, pyrometric measurements, reflectivity
measurements, and emissivity measurements.
5. The fiber optic current sensing system according to claim 1, wherein the fiber optic current transducer and the temperature sensor are together configured to operate on a single common optic fiber.
6. The fiber optic current sensing system according to claim 1, wherein the fiber optic current transducer comprises a first optic fiber and the temperature sensor comprises a second optic fiber.
7. The fiber optic current sensing system according to claim 1, further comprising a light source common to both the fiber optic current transducer and the temperature sensor.
8. The fiber optic current sensing system according to claim 1, further comprising one or more photodetectors common to both the fiber optic current transducer and the temperature sensor.
9. The fiber optic current sensing system according to claim 1, further comprising at least one detector responsive to at least one light characteristic selected from light intensity, light polarization, light wavelength, and light phase, such that the at least one detector is configured in combination with the temperature sensor to measure the operational temperature.
10. The fiber optic current sensing system according to claim 1, wherein the temperature sensor comprises semiconductor material.
11. The fiber optic current sensing sytem according to claim 10, wherein the temperature sensor is further configured to measure temperature at one or more discrete points along an optic fiber path.
12. The fiber optic current sensing system according to claim 10, wherein the semiconductor material comprises a direct-band edge material.
13. The fiber optic current sensing system according to claim 12, wherein the direct-band edge material is selected from type III-V and type II-VI semiconductor materials.
14. The fiber optic current sensing system according to claim 1, wherein the temperature sensor is a fiber optic sensor.
15. The fiber optic current sensing system according to claim 1, further comprising a temperature control system.
16. The fiber optic current sensing system according to claim 15, wherein the temperature control system is a passive control system.
17. The fiber optic current sensing system according to claim 16, wherein the passive temperature control system comprises an insulator configured to reduce the effects of environmental temperature changes surrounding the fiber optic current transducer.
18. The fiber optic current sensing system according to claim 15, wherein the temperature control system comprises both active control mechanisms and passive control mechanisms to control the operational temperature.
19. The fiber optic current sensing system according to claim 15, wherein the temperature control system is an active control system.
20. The fiber optic current sensing system according to claim 19, wherein the active temperature control system operates to control the operational temperature by heating or cooling.
21. The fiber optic current sensing system according to claim 20, wherein the active temperature control system is powered by optically or electrically delivered power.