METHOD OF MEASURING TEMPERATURE OF LED ACTIVE AREA Russian patent published in 2018 - IPC G01J5/60 G01R31/265 

FIELD: measuring equipment.

SUBSTANCE: invention relates to the field of measurement technology and concerns a method for measuring the temperature of the active area of an LED. Method consists in that a heating current of a predetermined value is passed through the LED, the LED radiation is supplied to two photodetectors, and the active region of the LED is determined by the change in the central wavelength of the radiation. First photodetector is selected with Gaussian spectral sensitivity with a width many times larger than the width of the spectrum of the LED. Second photodetector has a uniform spectral sensitivity in a given range of radiation wavelengths. When measuring, the signals of photodetectors U₁(0) and U₂(0) are measured immediately after supplying heating current and U₁(t_n) and U₂(t_n) at a given time t_n after warming up. Temperature T_pn active area of the LED at time t_n calculated by the formula where , K_λ – temperature coefficient of the central radiation length of the LED, σ₁ – width of the spectral sensitivity of the first photodetector, T₀ – temperature of the active region of the LED before heating.

EFFECT: technical result is to simplify the method and reduce the time of measurement.

1 cl, 2 dwg