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IR Narrow Bandpass Filters

Photonics.com
Nov 2010
Deposition Sciences Inc. (DSI)Request Info
 
SANTA ROSA, Calif., Nov. 30, 2010 — Deposition Sciences Inc. has introduced infrared narrow bandpass filters for industrial, medical and biological sciences instrumentation.

The filters offer high spectral performance with accurate center wavelength placement and good temperature stability, rendering them suitable for spectroscopic applications such as gas sensing. The IR spectral range enables the user to detect a particular gas and to identify the concentration levels of gases such as CO2, CH4, hydrogen oxygen and more. The detection of gas concentrations by spectroscopic techniques is the basis for a variety of applications.

The absorption of infrared radiation at wavelengths between 2 and 20 µm provides a definitive signature of the bending, stretching and/or twisting of the atomic bonds in a particular gas molecule. The IR narrow bandpass filters allow discretization of the spectra through a gas sample at multiple detection wavelengths, inside and/or outside the absorption band of interest.

Thin-film optical coatings are widely used for nondiffractive infrared sensing systems and other measurement tasks. The filters are calibrated for center wavelength placement to offset temperature shifts that are native to this spectroscopic measurement technique.

They also feature reliable and repeatable transmittance characteristics which are essential for high performance in any gas-sensing application in the infrared.


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