气体二氧化氯在空间消毒领域具有广阔的应用前景，但其浓度在线检测技术的不成熟在很大程度上限制了它的推广应用。本文基于吸光光度法的检测原理，采用 LED作为光源，设计了简化的单波长双光路差分吸收式浓度检测探头，研制了可在线检测 0~9 mg/L浓度范围的气体二氧化氯浓度传感器，采取多种措施避免气体二氧化氯在检测过程中发生光降解，提高传感器寿命和稳定性。并且设计搭建了标定实验平台进行传感器的标定。结果表明，本文设计的气体二氧化氯浓度传感器精度优于 2% F.S.，能够满足气体二氧化氯空间消毒对浓度检测的需求。

As is well known, gaseous chlorine dioxide holds great prospect for room disinfection, but the technology of on-line concentration monitoring is immature, which hinders its widely use to a great extent. Based on absorption photometry principle, using LED as a light source, the differential absorption type measuring unit with simplified single wavelength and double light paths was designed. This paper realized the concentration sensor of gaseous chlorine dioxide with a detection range of 0~9 mg/L. Various measures were taken to avoid the photochemical decomposition of gaseous chlorine dioxide in the detection process to improve the stability of the sensor. Additionally, the experiment platform was designed to calibrate the sensor. The result shows that the design can meet the demand of on-line concentration monitoring for room disinfection using gaseous chlorine dioxide, with the accuracy of better than 2% of full scale.