This work attempts to find values of thermal resistances for the heating simulation of an induction motor by measurement on this motor. This article works with the assumption of a special case in that it is not possible to bring up an external load torque on the shaft. Nevertheless it should be possible to measure temperatures according to the insulation class of the motor. These claims can be met by the reversing duty of the induction motor with different periods and duty factors. The very useful measurements of rotor temperatures were realised by a measurement transmission with silver sliprings. The base of the equivalent thermal network is a four body model. The thermal capacities were specified by measurement of the different masses and by calculation from drawings. The different losses are broken down by calculation in different parts and used as input for the equivalent thermal network in which only the thermal resistances are unknown. A set of several different measurements (and equations) are available which allow the specification of the thermal resistances.

The new method of measurement of true temperature and emissivity is considered. The method is based on use of redundancy of the information of Plank's radiation and changes of properties of substance finding the reflection in change of emissivity factor from temperature. The simultaneous application of relative spectroreflectometry allows to reduce quantity of used spectral components and to determine emissivity's meanings, including surfaces, which are not following Lambert law. It is shown, that the method allows to build a thermodynamic temperature scale without using of black body.

Photothermal radiometry has been proved being a versatile tool for the non-contact and non-destructive material inspection in near-surface zones. Although these near-surface areas represent only a few percent of the workpiece’s volume, they influence significantly its quality, functional behaviour, reliability and life time. In particular, they determine decisively the mechanical properties of precisely manufactured and/or surface finished parts. In photothermics, the propagation and penetration depths of optically excited thermal waves, the thermal response at the surfaces on optical excitation of opaque materials give sets of information about the outer and inner structures of the inspected materials. This paper focuses on photothermal radiometry and its potential to assess the thermal material properties and their changes which might be induced by a mechanical impact and/or by a thermal treatment. Special emphasis is given on the industrial applicability of the photothermal radiometric technique. Two problems of industrial relevance are illustrated: the thickness determination of optically opaque layers and the evaluation of hardness depths and profiles in steel specimens.

In the field of calibration of temperature measurement devices, the comparison method is usually used. To improve the uncertainty of the method, a number of specific conditions should be taken into account, such as temperature stability and the homogenous field inside the working area of the heating device. It is more difficult to realise those demands at higher temperatures in excess of 1000°C. We discuss the commercial heating furnace, carry out the reconstruction of the heating element and improve regulation, attaching importance to the location of the sensors. The isothermal 600-mm-long cylindrical block, with holes for testing and a reference probe, is linked with a special cylindrical heating element to compensate for heat flow at the front of the furnace and to improve uniformity.

The accurate measurement of temperature is very important to achieve high quality products in materials processing such as arc welding and thermal cutting. The IR(infrared) radiation thermometer has been applied to these processing, because it requires no physical contact with an object. Generally, the radiation thermometry leads to noticeable error in measuring temperature of molten pool under the welding where the emissivity is unknown. In the present paper, the molten pool temperature measurement by UV(ultra violet) thermal radiation has been discussed. In the experiment, stainless steel have been melted with TIG(tungsten inert gas)-arc, and the temperature distribution of molten pool has been measured with an UV sensor system and IR sensor.