Method and assembly for the multi-channel measurement of temperatures using the optical detection of energy gaps of solid bodies

摘要

The invention relates to a process and an arrangement for temperature measurement by means of optical detection of energy band gaps of solids with electrical light sources, measurement probes and a wavelength-sensitive detection system that measures the frequency of the light guided back by the measurement probe. ;The object of the invention to devise a process and a device with which the disadvantages of the prior art are avoided and with which the measurement accuracy, the possible length of the measurement probes, the measurement speed and flexibility can be increased in multichannel measurement arrangements, is achieved by a process for measurement of temperatures by means of optical detection of energy band gaps of solids with electrical light sources, measurement probes and a wavelength-sensitive detection system that measures the frequency of the light guided back by the measurement probe, from a number of at least two light sources by means of a control unit, one or more light sources are turned on over defined time intervals, the light emitted by the light sources that have been turned on being routed, via the optical fibers assigned to the respective light source, to a solid-state sensor assigned to the light source in which the optical signal is modified depending on temperature, the modified optical signal being routed via optical fibers to an optical mixer, in which the modified optical signals of all solid-state sensors are combined, and the resulting optical signal being routed from the mixer to an optical detection system, in which the spectral properties of the optical signal are converted with time resolution into electrical signals, and from the time-resolved electrical signals, an evaluation unit calculating one or more temperatures that are assigned to the light sources and to the associate solid-state sensors (measurement channels).