CO and CO₂ dual-gas detection based on mid-infrared wideband absorption spectroscopy

Abstract

A dual-gas sensor system is developed for CO and CO₂ detection using a single broadband light source, pyroelectric detectors and time-division multiplexing (TDM) technique. A stepper motor based rotating system and a single-reflection spherical optical mirror are designed and adopted for realizing and enhancing dual-gas detection. Detailed measurements under static detection mode (without rotation) and dynamic mode (with rotation) are performed to study the performance of the sensor system for the two gas samples. The detection period is 7.9 s in one round of detection by scanning the two detectors. Based on an Allan deviation analysis, the 1σ detection limits under static operation are 3.0 parts per million (ppm) in volume and 2.6 ppm for CO and CO₂, respectively, and those under dynamic operation are 9.4 ppm and 10.8 ppm for CO and CO₂, respectively. The reported sensor has potential applications in various fields requiring CO and CO₂ detection such as in the coal mine.

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