METHOD FOR MEASURING THE HEATING TEMPERATURE OF THE FILAMENTS OF LIGHTING LAMPS Russian patent published in 2022 - IPC G01K7/18 

FIELD: measuring equipment.

SUBSTANCE: invention relates to the field of thermometry and can be used to measure the temperature corresponding to the heating of the filament in incandescent lighting lamps. In the proposed method, a voltage U1 is applied to the filament, at which, as a result of heating, a visible glow of the surface of about half the length of the filament is detected visually or with the help of a video camera. Then the voltage U₁ and the current I₁ passing through the filament are measured, and the initial resistance R₁ of the filament is determined by these parameters. Next, the voltage U applied to the filament is set so that its heating corresponds to the required lamp glow level. Then the voltage U and current I are measured through the filament and the final electrical resistance R is calculated using these two parameters. Further, according to the initial and final resistance of the filament, its temperature T is determined by the formula

where α₀ is the temperature coefficient of resistance corresponding to the temperature T₀ = 273 K, α₁ is the temperature coefficient of resistance corresponding to the temperature T₁ = 800 K, at which the visible glow of the filament appears.

EFFECT: increase in the accuracy of measuring the average volume temperatures of the filament in incandescent lighting lamps in the temperature range of 800 K - 3000 K.

1 cl, 1 dwg