光电子快报(英文版), 2016, 12 (5): 379, Published Online: Oct. 12, 2017   

Design and fabrication of a mid-infrared carbon dioxide sensor for the application in greenhouse environment

Author Affiliations
State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, China
Abstract
A mid-infrared carbon dioxide (CO2) sensor is presented for the application in greenhouse environment. An integrated multi-pass gas chamber and a dual-channel differential detection method are adopted to decrease response time and suppress environmental influence, respectively. An optical module is developed using a cost-effective wideband mid-infrared light source, a dual-channel pyre electrical detector and a spherical mirror, and the moisture-proof function is specially designed for enabling the application of this sensor in greenhouse with high humidity. Experiments are carried out to evaluate the sensing performance on CO2concentration. According to the experimental results, the limit of detection (LoD) is about 3×10-5with an absorption length of 30 cm. The relative detection error is less than 5% within the measurement range of 3×10-5—5×10-3. Based on 10 h long-term stability measurement on 5×10-4and 2×10-3standard CO2 samples, the maximum fluctuations are 1.08% and 3.6%, respectively. By using a 2.4 GHz wireless network communication system for remote monitoring and data recording, a field measurement of this sensor in a greenhouse is conducted, and good performance is proven in such circumstance.

WANG Jia-ning, ZHENG Ling-jiao, NIU Xin-tao, ZHENG Chuan-tao, WANG Yi-ding. Design and fabrication of a mid-infrared carbon dioxide sensor for the application in greenhouse environment[J]. 光电子快报(英文版), 2016, 12(5): 379.

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