| 摘要 |
A temperature measuring device for a metal caster comprises a radiation pyrometer including an IR diode for measuring the head radiation of the metal melt in the crucible of the metal caster. For this purpose, a graphite body dips into the metal melt. The graphite body is seated coaxially around one end of a hollow tube to whose other end is coupled a glass fiber cable which is connected with the IR evaluation diode. The graphite body which dips into the metal melt and simultaneously serves in a known manner as a closing plug for the crucible, now emits thermal radiation into the interior of the tube, such radiation substantially corresponding to the composition of the thermal radiation of a blackbody having the temperature of the metal melt. This thermal radiation is coupled into the glass fiber cable at the other end of the tube and fed to the IR diode for evaluation. This solution permits a relatively inertia-free and very precise measurement, since the measured thermal radiation no longer depends on the type of metal melt employed and, on the other hand, the IR diode employed for the measurement has a certain distance from the caster and is thus free of radiation influences on the part of the caster which could falsify the measuring result.
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