Infrared Detection Filters

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Infrared detection filter is a spectral gating element in infrared detection systems, which relies on material intrinsic absorption or multi-layer dielectric film interference to only allow the target infrared band to pass through, block visible light, stray light, and irrelevant infrared radiation, reduce detector noise, and improve detection signal-to-noise ratio. It is widely used in gas detection, infrared temperature measurement, thermal imaging, flame monitoring, and optical analysis equipment.

Infrared band division

1. Near infrared NIR: 0.75-3 μ m (750nm-3000nm)

Remote control, photoelectric sensing, blood oxygen, laser detection, spectral analysis

2. Mid infrared MWIR: 3-5 μ m (atmospheric window, gas characteristic absorption zone)

CO ₂ 、CO、 Methane VOC、 Flame detection and smoke monitoring

3. Far infrared LWIR: 8-14 μ m (room temperature object thermal radiation window)

Human body temperature measurement, industrial infrared temperature measurement, thermal imaging instrument

Narrowband pass filter: CO ₂: 4.26 μ m; CO：4.67 μm； CH₄：3.3 μm； SO₂：7.35 μm
Broadband pass filter: 8-14 μ m temperature measurement, 3-5 μ m flame monitoring
Long wave pass filter 8 μ m is commonly used as a pre filter for far-infrared temperature measurement
Short wave pass filters are commonly used in visible light cameras to eliminate infrared interference

Selection of commonly used base materials

Substrate Material Applicable Wave Range Typical Uses
Silicon Si 1.1～9 μm NDIR gas sensor, detection at 3-5 μ m and above 5 μ m
Zinc Selenide ZnSe 0.6～18 μm Mid infrared precision spectroscopy and laser infrared system
Zinc sulfide ZnS 0.4～14 μm Infrared detection in harsh industrial environments
Calcium fluoride CaF ₂ 0.2～8 μm High precision mid infrared spectrometer
Quartz/Optical Glass 0.2～2.7 μm Near infrared (<2.7 μ m) detection
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