DETERMINATION OF TUNGSTEN WIRE TEMPERATURE
The article deals with issues related to the determination of the temperature of a tungsten wire. The urgency of the task is indicated in the development of heating and lighting devices for various purposes. Known tabular data on the correspondence between the temperature of tungsten and the change in its electrical resistivity are given. Several analytical functions are proposed and compared that describe the dependence of the temperature of tungsten on the change in the value of its electrical resistivity. From the considered linear and power functions, polynomial functions of the second and third order, the function that has the smallest discrepancies is selected. The relative error of the results is calculated. Determines the differential and integral discrepancy between the calculated data and the known results given in the literature. A setup diagram is proposed that allows measuring the resistance of incandescent lamps at various temperatures of the tungsten filament used in them. Based on the measured resistance values, the temperature of the tungsten filament is determined. The dependence of the temperature for vacuum and gas-filled lamps on the magnitude of the applied voltage is established. The results of measuring the resistance of lamps, calculating the temperature of the spiral by changing the resistance with the corresponding data given in the literature are compared. A conclusion is made about the possibility of determining the temperature by measuring the resistance value of tungsten wires using a third-order polynomial dependence.