摘要
A differential carbon monoxide(CO) concentration sensing device using a self-fabricated spherical mirror(e.g.light-collector) and a multi-pass gas-chamber is presented in this paper.Single-source dual-channel detection method is adopted to suppress the interferences from light source,optical path and environmental changes.Detection principle of the device is described,and both the optical part and the electrical part are developed.Experiments are carried out to evaluate the sensing performance on CO concentration.The results indicate that at 1.013×10~5 Pa and 298 K,the limit of detection(LoD) is about 11.5 mg/m^3 with an absorption length of 40 cm.As the gas concentration gets larger than115 mg/m^3(1.013×10~5 Pa,298 K),the relative detection error falls into the range of-1.7%—+1.9%.Based on 12 h long-term measurement on the 115 mg/m^3 and 1 150 mg/m^3 CO samples,the maximum detection errors are about0.9%and 5.5%,respectively.Due to the low cost and competitive characteristics,the proposed device shows potential applications in CO detection in the circumstances of coal-mine production and environmental protection.
A differential carbon monoxide （CO） concentration sensing device using a self-fabricated spherical mirror （e.g. light-collector） and a multi-pass gas-chamber is presented in this paper. Single-source dual-channel detection method is adopted to suppress the interferences from light source, optical path and environmental changes. Detection principle of the device is described, and both the optical part and the electrical part are developed. Experiments are carried out to evaluate the sensing performance on CO concentration. The results indicate that at 1.013× 10^5 Pa and 298 K, the limit of detection （LoD） is about 11.5 mg/m3 with an absorption length of 40 cm. As the gas concentration gets larger than 115 mg/m3 （1.013×10^5 Pa, 298 K）, the relative detection error falls into the range of-1.7%-＋1.9%. Based on 12 h long-term measurement on the 115 mg/m3 and 1 150 mg/m3 CO samples, the maximum detection errors are about 0.9% and 5.5%, respectively. Due to the low cost and competitive characteristics, the proposed device shows potential applications in CO detection in the circumstances of coal-mine production and environmental protection.
基金
supported in part by the National Key Technology R&D Program of China(Nos.2013BAK06B04 and 2014BAD08B03)
the National Natural Science Foundation of China(Nos.61307124 and 11404129)
the Science and Technology Department of Jilin Province of China(Nos.20120707 and 20140307014SF)
the Changchun Municipal Science and Technology Bureau(Nos.11GH01 and 14KG022)
the State Key Laboratory of Integrated Optoelectronics,Jilin University(No.IOSKL2012ZZ12)
