Pyroelectric detectors reduce crosstalk to other gases

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10th May 2016

Source: LASER COMPONENTS (UK) Ltd.

Pyroelectric detectors reduce crosstalk to other gases

Pyroelectric detectors are used in gas analysis. Each gas can be detected using a very specific wavelength – the so-called absorption wavelength. Moisture is often tested at the wavelengths 1.94 µm and 2.9 µm; however, in this case, the absorption wavelengths of CO₂ overlap the signal: with these wavelengths, the moisture of the gas mixtures can actually only be determined using complex measurement equipment.

With the right filters and a suitable light source it is also possible to achieve a reliable measurement with simple NDIR measurement devices.

Laser Components has launched three new filters that are selected in such a way as to significantly reduce the crosstalk to other gases to achieve uncomplicated measurements with NDIR measurement devices.

For the measurement of methane (CH₄): λ_CWL = 7.91 µm ± 160 nm For the measurement of alcohol mixtures: λ_CWL = 9.50 µm ± 450 nm For the measurement of moisture (water vapor): λ_CWL = 5.78 µm ± 180 nm

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