Temperature invariant infrared filter
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United States of America Patent
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Oct 22, 2019
Grant Date -
Nov 8, 2018
app pub date -
Sep 9, 2015
filing date -
Sep 15, 2014
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Abstract
A narrow bandpass filter that may be used in a mid-infrared sensor for monitoring a species, which may be a component of a fluid or a solid material. The filter comprises a cavity comprising a low refractive index material. By providing a high ratio of low refractive index material in the filter with respective to high refractive index material, the filter is configured so that wavelength transmission remains constant with varying temperature. Materials used for the low and/or high refractive index provide a temperature invariant filter that transmits mid-infrared spectra without serious degradation.
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