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Laser Components USA, Inc.
116 South River Road
Building C
Bedford, NH 03110
USA
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Five New Bandpass Filters for Pyroelectric Detectors

15.03.2017

Set up Your Detector for Different Gas Measurements


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, Bandwidth at half-power point (FWHM) = 90 nm).

The CO2 filter A with an peak wavelength = 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, lead 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 (peak wavelength = 9.50 µm, FWHM = 450 nm) has become beneficial.



Further product information:
Choice of Filters for Pyroelectric Detectors

Contact:

Contact Person:    Jim Dell
Company:    LASER COMPONENTS USA Inc.
Address:    116 South River Road Building C
ZIP / City:    03110 Bedford, NH
Phone:    +1 603 821 7040
Fax:    +1 603 821 7041
Email:    ircomponents@laser-components.com
 

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Media Contact

Christy Houpis
Head of US Marketing
LASER COMPONENTS USA
Phone: 603-821-7040
Email: c.houpis@lasercomponents.com