Mid-infrared high-sensitive cavity-free in-situ CO gas sensing based on up-conversion detection
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arXiv
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| Auteurs principaux: | , , , , , , , , , , |
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| Format: | Preprint |
| Publié: |
2026
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| _version_ | 1866914582975479808 |
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| author | Han, Zhao-Qi-Zhi Zhang, He Yang, Fan Wang, Xiao-Hua Liu, Bo-Wen Li, Jin-Peng Zhou, Zheng-He Li, Yin-Hai Li, Yan Zhou, Zhi-Yuan Shi, Bao-Sen |
| author_facet | Han, Zhao-Qi-Zhi Zhang, He Yang, Fan Wang, Xiao-Hua Liu, Bo-Wen Li, Jin-Peng Zhou, Zheng-He Li, Yin-Hai Li, Yan Zhou, Zhi-Yuan Shi, Bao-Sen |
| contents | Carbon monoxide (CO) is a significant indicator gas with considerable application value in atmospheric monitoring, industrial production and medical diagnosis. Its fundamental vibrational band locates around 4.6 $\upmu$m and has larger absorption line strength than that of overtone band, which is more suitable for the precise identification and concentration detection of CO. In this paper, the up-conversion detection is employed to convert the mid-infrared absorption signal obtained by TDLAS to the visible light band, then a silicon-based detector is utilized for detection. By which, we can achieve the highest sensitivity of 79.6 ppb under the condition of cavity-free in-situ with an absorption range length of only 0.14 m. Furthermore, the single-photon level real-time detection of CO concentration after the diffuse reflection is realized by using SPAD. This work demonstrates the merits of the up-conversion detection in terms of its functionality at room temperature and capacity for sensitivity detection. Furthermore, it presents a design and optimization methodology that has the potential to underpin the advancement of the method towards more practical applications, like industrial process monitoring, medical diagnosis and so on. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_15981 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Mid-infrared high-sensitive cavity-free in-situ CO gas sensing based on up-conversion detection Han, Zhao-Qi-Zhi Zhang, He Yang, Fan Wang, Xiao-Hua Liu, Bo-Wen Li, Jin-Peng Zhou, Zheng-He Li, Yin-Hai Li, Yan Zhou, Zhi-Yuan Shi, Bao-Sen Optics Instrumentation and Detectors Carbon monoxide (CO) is a significant indicator gas with considerable application value in atmospheric monitoring, industrial production and medical diagnosis. Its fundamental vibrational band locates around 4.6 $\upmu$m and has larger absorption line strength than that of overtone band, which is more suitable for the precise identification and concentration detection of CO. In this paper, the up-conversion detection is employed to convert the mid-infrared absorption signal obtained by TDLAS to the visible light band, then a silicon-based detector is utilized for detection. By which, we can achieve the highest sensitivity of 79.6 ppb under the condition of cavity-free in-situ with an absorption range length of only 0.14 m. Furthermore, the single-photon level real-time detection of CO concentration after the diffuse reflection is realized by using SPAD. This work demonstrates the merits of the up-conversion detection in terms of its functionality at room temperature and capacity for sensitivity detection. Furthermore, it presents a design and optimization methodology that has the potential to underpin the advancement of the method towards more practical applications, like industrial process monitoring, medical diagnosis and so on. |
| title | Mid-infrared high-sensitive cavity-free in-situ CO gas sensing based on up-conversion detection |
| topic | Optics Instrumentation and Detectors |
| url | https://arxiv.org/abs/2601.15981 |