Gas detection based on a mid-infrared super-pixel multi-spectral imaging device

Gas detection is an important application area in industry. The detection of CO₂ plays a crucial role in environmental protection. However, the primary challenges in achieving atmospheric CO₂ and other detection of other gases revolve around developing instrumentation featuring a broad detection range, heightened sensitivity, and dynamic real-time capabilities. To address these challenges, a four-channel multi-spectral imaging device utilizing a super-pixel filter array (SFA) for simultaneous detection of multiple gases in the mid-infrared (MIR) is introduced in this work. The device demonstrates selective transmittance at wavelengths of 3.92, 4.08, 4.29, and 4.40 µm, achieving a spectral resolution (δλ/λ) of 1%. The SFA’s narrowband filtering capability facilitates real-time imaging detection of multiple gases by its high spectral selectivity of each super-pixel unit. Multi-channel spectral detection capability means that our detectors can detect multiple target gases simultaneously according to the specific spectral channel of each unit. Finally, the great potential of this technique for CO₂ detection was verified by a demonstration experiment.