Pulse width modulation of continuum sources for determination of chemical composition
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United States of America Patent
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Oct 13, 2015
Grant Date -
Sep 3, 2015
app pub date -
May 14, 2015
filing date -
Dec 28, 2012
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Abstract
A light source and a method for its use in an optical sensor are provided, the light source including a resistively heated element. The light source includes a power circuit configured to provide a pulse width modulated voltage to the resistively heated element, the pulse width modulated voltage including: a duty cycle with a first voltage; and a pulse period including a period with a second voltage, wherein: the duty cycle, the first voltage, and the pulse period are selected so that the resistively heated element is heated to a first temperature; and the first temperature is selected to emit black body radiation in a continuum spectral range. Also provided is an optical sensor for determining a chemical composition including a light source as above.
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