Sensing temperature of a light emitting diode
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United States of America Patent
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Sep 25, 2012
Grant Date -
May 27, 2010
app pub date -
Aug 15, 2006
filing date -
Aug 15, 2006
priority date (Note) -
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status (Latency Note)
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Abstract
A system (100) for sensing a temperature of a light emitting diode (LED). The system may comprise an LED having a spectral output centered at a first wavelength, a first filter (104) that transitions from attenuation to transmission at about the first wavelength, and a second filter (106) that transitions from transmission to attenuation at about the first wavelength. The system may also comprise a first sensor (108) positioned to sense a first intensity of the LED through the first filter and a second sensor (110) positioned to sense a second intensity of the LED through the second filter. It will be appreciated that a single sensor may be substituted instead of the first and second sensors, provided that the single sensor is capable of selectively viewing the LED through the first and the second filters. The system may also comprise a computer (112) configured to derive a temperature of the LED considering the first intensity and the second intensity.
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