METHOD AND APPARATUS FOR MEASURING TRANSIENT THERMAL CHARACTERISTICS OF LIGHT-EMITTING DIODES Russian patent published in 2014 - IPC G01R31/28 G01J3/28 

FIELD: physics.

SUBSTANCE: disclosed is a method of measuring transient thermal characteristics of light-emitting diodes (LED), where injection current is supplied in form of a sequence of increasing-duration pulses with a period between pulses sufficient for cooling down the active region and not shorter than the time for reading the signal from the output of a photodetector line. Further, direct injection current is transmitted to the LED and the radiation spectrum is measured at given time instances during the measurement cycle up to complete heating of the LED. The apparatus for carrying out the method includes series-connected injection current generator, LED, electrooptical shutter, monochromator and receiving-conversion unit, which includes a multi-element photodetector line as a photodetector, a first and a second pulse generator, an analogue-to-digital converter and a microcontroller. Control outputs of the microcontroller are connected to the input of the injection current generator and the input of the first pulse generator, the output of which is connected to control inputs of the electrooptical shutter and the second pulse generator, the outputs of which are connected to control inputs of the photodetector and the analogue-to-digital converter.

EFFECT: high accuracy of determining transient thermal characteristics of light-emitting diodes.

2 cl, 2 dwg