News | March 28, 2017

Five New Bandpass Filters For Pyroelectric Detectors

Source: Laser Components USA, Inc.
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Five New Bandpass Filters For Pyroelectric Detectors

Bedford, NH - LASER COMPONENTS introduces five new bandpass filters for pyroelectric detectors, increasing the number of standard filters available to an outstanding seventeen versions. The new filters include reference filters (B) and filters for the detection of CO2 (A), water vapor (M), methane (S), and alcohol (O), and are either mounted directly inside the fixed cap of the detector or available as a separate cap, which is then mounted to an existing pyroelectric detector.
A reference filter should not have any gas absorption. Filter B can be used when SO2 is part of the gas mixture (peak wavelength = 3.86 µm, Full Width-Half Max (FWHM) = 90 nm).
The CO2 filter A with a peak wavelength of 4.265 µm is the filter with the best possible signal and simple linearization (FWHM = 110 nm).
Water vapor is in almost every gas mixture, which often leads to a disturbing background noise. An attempt to measure this with a 2.94 µm filter, for example, leads to problems of cross-sensitivity with CO2. The M filter has proven more reliable in such practical applications: peak wavelength = 5.78 µm, FWHM = 180 nm.
Methane is primarily measured at 3.33 µm; however, this is not particularly specific. An excellent alternative is the S filter, which operates at a longer-wave band: peak wavelength = 7.91 µm, FWHM = 160 nm.
With the increased popularity of breath alcohol measurement, the new standard filter S (peak wavelength = 9.50 µm, FWHM = 450 nm) has become beneficial.
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The Company
LASER COMPONENTS USA – part of the LASER COMPONENTS GROUP – specializes in sales, distribution and marketing of components in the laser and optoelectronics industry. We have been serving customers over 15 years in North America with products from our manufacturing sites in Germany, Canada and the US, as well as from well-selected international suppliers.
We serve a wide variety of photonics applications with avalanche photodiodes and modules (Si and InGaAs), IR detectors (InGaAs, PbS, PbSe, pyroelectric), photon counting modules, laser diodes and modules (at different wavelengths and power), pulsed laser diodes (905 and 1550 nm), laser diode drivers, laser optics (standard or custom dielectric coated) and polarizers.
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SOURCE: Laser Components USA