Carbon Dioxide Sensor Module Based on NDIR Technology Article Swipe

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Lithium tantalate Carbon dioxide sensor Materials science Pyroelectricity Miniaturization Compensation (psychology) Detector Wafer Optoelectronics Infrared Optics Electronic engineering Carbon dioxide Ferroelectricity Dielectric Lithium niobate Chemistry Engineering Nanotechnology Psychology Psychoanalysis Physics Organic chemistry

Libing Zhou , Yaoyi He , Qing Zhang , Lei Zhang ·

YOU? · · 2021 · Open Access · · DOI: https://doi.org/10.3390/mi12070845 · OA: W3183417544

In this paper, a gas detection system with an environmental compensation algorithm based on nondispersive infrared (NDIR) technology was designed. The prepared infrared pyroelectric detector was a dual-channel type based on the lithium tantalate (LiTaO3) wafer. The design of the optical gas chamber adopted a combination of two ellipsoids and a spherical top surface, which not only enhanced the coupling efficiency of the light propagation but also facilitated the miniaturization of the sensor module. In addition to this, a temperature and humidity compensation algorithm based on the least square method was proposed to make the measurement accuracy up to ±0.9% full scale (FS).