Spectrophotometer and method
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United States of America Patent
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Oct 2, 2012
Grant Date -
Jun 17, 2010
app pub date -
Apr 3, 2008
filing date -
Apr 3, 2007
priority date (Note) -
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Abstract
A spectrophotometer includes a plurality of LEDs arranged in a circular array, each having a calibrated power input determined by the use of pulse width modulation and each having a unique wavelength band determined by the utilization of a unique fluorescent phosphor coating or lens. At least one of the LEDs comprising a phosphor-free high energy UV LED. Light reflected to the spectrophotometer is divided into predetermined wavelength ranges through the utilization of a linear variable filter and photo detectors wherein the analog signal from a photo detector is converted to a digital value through the use of auto-ranging gain technique.
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