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(tn) and U2(tn) at a given time tn after warming up. Temperature Tpn active area of the LED at time tn calculated by the formula where
, Kλ – 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
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Authors
Dates
2018-12-26—Published
2017-11-14—Filed