提出了一种基于Co-四（4-羧苯基卟吩）（Co-TCPP）金属有机框架的马赫-曾德尔结构CO传感器。该传感结构在两段薄芯光纤以及薄芯光纤与单模光纤之间熔接粗锥，将Co-TCPP涂覆在薄芯光纤表面。Co-TCPP的纳米片状形貌和多孔微结构，使该传感器不仅易于与光纤粘附，还对CO有较强的吸附能力。通过X射线衍射、扫描电子显微镜、红外光谱、热重分析等表征分析敏感材料Co-TCPP的结构、形貌和性质。结果表明，该传感器对CO质量分数的灵敏度为0.0497 dB/10^-6，对质量分数-光强的拟合度高达0.99148，CO质量分数为40×10^-6时的响应时间约为120 s，且对CO具有良好的选择性和时间稳定性。

A Mach-Zehnder-structured CO sensor based on Co-tetrakis(4-carboxy- phenyl) porphyrin (Co-TCPP) metal-organic framework is proposed in this study. In the sensing structure, a thick taper is fused between two sections of thin-core optical fiber and between the thin-core fiber and the single-mode fiber, and Co-TCPP is coated on the thin-core fiber's surface. The nanosheet-like morphology and porous microstructure of Co-TCPP make the sensor not only easy to adhere to the fiber but also have a strong adsorption capacity for CO. The structure, morphology, and properties of the sensitive material Co-TCPP are characterized and analyzed by X-ray diffraction, scanning electron microscopy, infrared spectroscopy, and thermogravimetric analysis. The findings demonstrate that the sensor's sensitivity to CO mass fraction is 0.0497 dB/10^-6, the fitting degree to mass fraction-light intensity is as high as 0.99148, and the response time is around 120 s when the CO mass fraction is 40 × 10^-6, and it has good selectivity and time stability to CO.