LOSSLESS REAL-TIME MEASUREMENT METHOD FOR JUNCTION TEMPERATURE OF LED LIGHT SOURCE

摘要

The present invention provides a lossless real-time measurement method for the junction temperature of an LED light source. The method comprises the following steps: S1, energizing an LED light source to be detected, and projecting, onto a screen, an optical image formed by a light beam emitted by the energized LED light source after passing through an optical element; S2, establishing a position correlation between each LED chip in the LED light source and the optical image; S3, according to the established correlation, respectively collecting a light beam at each position in the optical image, carrying out spectral analysis on light emitted by the LED chip in the light beam, and obtaining an optical frequency peak value and width information of each LED chip including a corresponding position; and S4, establishing a standard curve of a spectrum-temperature relationship, and combining the standard curve and an obtained spectrum to determine the junction temperature of each LED chip in the LED light source. By means of the present invention, the junction temperature of each LED chip can be measured in a real-time and lossless manner, and according to a measurement result, the quality and the service life of an LED light source are evaluated.