A miniaturized photometric ozone sensor using ultraviolet LED with unbalance differential correction and 3D printing

Yunfei Meng; Ruiyan Han; Hongshen Wan; Zehua Wang; Zhenhui Du

doi:10.1016/j.saa.2023.123335

A miniaturized photometric ozone sensor using ultraviolet LED with unbalance differential correction and 3D printing

Spectrochim Acta A Mol Biomol Spectrosc. 2024 Jan 5:304:123335. doi: 10.1016/j.saa.2023.123335. Epub 2023 Sep 1.

Authors

Yunfei Meng¹, Ruiyan Han², Hongshen Wan¹, Zehua Wang¹, Zhenhui Du³

Affiliations

¹ State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, China.
² 718th Research Institute of China Shipbuilding Industry Corporation, Tianjin 056027, China.
³ State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, China. Electronic address: duzhenhui@tju.edu.cn.

PMID: 37678047
DOI: 10.1016/j.saa.2023.123335

Abstract

Ozone (O₃) sensing is of great significance to discern the ambient virulence from environmental deterioration. We developed a miniature, low power, low cost, and wide-temperature-range (-40 to +85 °C) photometric O₃ sensor for continuous and in-situ ambient O₃ monitoring. The primary innovation in this sensor is the combination of ultraviolet light emitting diodes (UV-LEDs) with unbalanced differential optical measurement with algorithm correction, sensitive electronic module, and 3D printing fabrication. The sensor operated in the Hartley band of O₃ with a UV-LED (258 nm, 1mw) and software phase-sensitive detection. Experimental results showed high performance of the sensor with detection limit of 8 ppb and relative error of 0.22%. The dimension, power, and weight of the sensor are as low as 11.4 × 5 × 2.4 cm, 0.5 W, and 0.1 kg, respectively, much lower than that of most O₃ sensors. We also demonstrated the feasibility of the sensor in continuously O₃ monitoring in an office.

Keywords: Multiple reflection gas cell; Ozone sensor; Software phase sensitive detector; Ultraviolet spectrophotometry.