Deposition Sciences has introduced advanced Infrared Narrow Bandpass (IR NBP) Filters for industrial, medical and biological sciences instrumentation.
The improved narrow bandpass optical filters offer high spectral performance, with accurate centre wavelength placement and good temperature stability, which makes the infrared NBPs suitable for spectroscopic applications such as advanced gas sensing.
The NBP filters' IR spectral range enables the user to detect a particular gas and to identify the concentration levels of gases such as CO2, CH4 and HOx.
'The detection of gas concentrations by spectroscopic techniques is the basis for a variety of applications,' said Lucas Alves, thin film design engineer, Deposition Sciences.
'The absorption of infrared radiation at wavelengths of 2-20um provides a definitive signature of the bending, stretching and/or twisting of the atomic bonds in a particular gas molecule,' he said.
'These IR narrow bandpass filters allow discretisation of the spectra through a gas sample at multiple detection wavelengths - inside and/or outside the absorption band of interest,' Alves added.
The NBP filters are calibrated for centre wavelength (CWL) 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.
