CPC H05B 47/10 (2020.01) [G01J 1/0252 (2013.01); G01J 1/32 (2013.01); G01J 1/42 (2013.01); G01J 3/0286 (2013.01); G01J 3/465 (2013.01); G01J 3/505 (2013.01); G01R 31/44 (2013.01); H05B 45/12 (2020.01); H05B 45/22 (2020.01); H05B 45/24 (2020.01); H05B 47/22 (2020.01); H05B 47/24 (2020.01); G01J 2001/4252 (2013.01); G01J 2001/444 (2013.01); H05B 45/18 (2020.01); H05B 47/105 (2020.01)] | 24 Claims |
1. A method of calibrating an illumination device that includes a plurality of LED chains and a photodetector, the method comprising
supplying operative drive currents to each of at least a portion of the plurality of LED chains during each of a plurality of sequential operative periods; and
interrupting the operative drive currents to all the LED chains for a non-operative period between successive, sequential, operative periods, and during the non-operative period:
successively applying, at a first illumination device operating temperature, at least three different LED drive currents to one of the plurality of LED chains to produce illumination at three or more different levels of brightness;
receiving optical measurement data using the illumination produced by the respective LED chain at the first illumination device operating temperature at each of the at least three different LED drive currents;
receiving electrical measurement data generated by the photodetector at the first illumination device operating temperature at each of the at least three different LED drive currents; and
storing the received optical measurement data and the received electrical measurement data associated with the respective LED chain in memory circuitry disposed in the illumination device.
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