US 11,723,134 B2
Illumination device and method for calibrating an illumination device over changes in temperature, drive current, and time
Horace C. Ho, Austin, TX (US); Jason E. Lewis, Driftwood, TX (US); and David J. Knapp, Austin, TX (US)
Assigned to Lutron Technology Company LLC, Coopersburg, PA (US)
Filed by Lutron Technology Company LLC, Coopersburg, PA (US)
Filed on Feb. 11, 2022, as Appl. No. 17/669,976.
Application 15/388,607 is a division of application No. 14/314,451, filed on Jun. 25, 2014, granted, now 9,557,214, issued on Jan. 31, 2017.
Application 17/669,976 is a continuation of application No. 16/819,497, filed on Mar. 16, 2020, granted, now 11,252,805.
Application 16/819,497 is a continuation of application No. 15/388,607, filed on Dec. 22, 2016, granted, now 10,595,372, issued on Mar. 17, 2020.
Prior Publication US 2022/0167479 A1, May 26, 2022
Int. Cl. G01J 1/02 (2006.01); H05B 45/18 (2020.01); H05B 47/10 (2020.01); G01J 3/46 (2006.01); G01J 3/50 (2006.01); G01J 3/02 (2006.01); H05B 45/22 (2020.01); H05B 45/24 (2020.01); H05B 47/24 (2020.01); H05B 47/21 (2020.01); H05B 45/12 (2020.01); G01J 1/32 (2006.01); G01J 1/42 (2006.01); G01R 31/44 (2020.01); G01J 1/44 (2006.01); H05B 47/105 (2020.01)
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
OG exemplary drawing
 
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.