A device for temperature measurement in electromagnetic fields, use of this apparatus and associated measuring arrangement

For temperature measurement in areas with electromagnetic fields shielding devices must be provided. According to the invention, a temperature sensor as a fiber optic sensor with Bragg gratings (FBG) is at least formed, wherein the sensor in a non-metallic housing (1) is disposed, the expansion effects for the individual FBG sensors (1, 1 ', 1' ', ...) excludes. Such a device can advantageously be used for measuring the temperature distribution in oil sand deposits, including a suitable measuring arrangement is required. A measurement arrangement having a plurality of such devices forms a distributed temperature sensor (1, 1 ', 1' ', ...), wherein the devices in parallel in holes (120, 120') of the reservoir (100) are guided.