Non-dispersive infrared (NDIR) spectroscopy analyzes the concentration of target gases based on their characteristic infrared absorption. In conventional NDIR gas sensors, an infrared detector has to pair with a bandpass filter to select the target gas. However, multiplexed NDIR gas sensing requires multiple pairs of bandpass filters and detectors, which makes the sensor bulky and expensive. Here, we propose a multiplexed NDIR gas sensing platform consisting of a narrowband infrared detector array as read-out. By integrating plasmonic metamaterial absorbers with pyroelectric detectors at the pixel level, the detectors exhibit spectrally tunable and narrowband photoresponses, circumventing the need for separate bandpass filter arrays. We demonstrate the sensing of H₂S, CH₄, CO₂, CO, NO, CH₂O, NO₂, SO₂. The detection limits of common gases such as CH₄, CO₂, and CO are 63 ppm, 2 ppm, and 11 ppm, respectively. We also demonstrate the deduction of the concentrations of two target gases in a mixture.

非分散红外（NDIR）光谱基于目标气体的特征红外吸收来分析目标气体的浓度。在传统的NDIR气体传感器中，红外检测器必须与带通滤光镜配对才能选择目标气体。但是，多路NDIR气体传感需要多对带通滤波器和检测器，这使传感器体积庞大且价格昂贵。在这里，我们提出了一个由窄带红外探测器阵列组成的多路NDIR气体传感平台，作为读出。通过将等离子超材料吸收体与热电探测器在像素级别集成在一起，探测器可以显示光谱可调和窄带光响应，从而避免了对单独的带通滤波器阵列的需求。我们展示了H ₂ S，CH ₄，CO的感测₂，CO，NO，CH ₂ O，NO ₂，SO ₂。CH ₄，CO ₂和CO等常见气体的检出限分别为63 ppm，2 ppm和11 ppm。我们还证明了可以减少混合物中两种目标气体的浓度。