期刊
SENSORS
卷 19, 期 23, 页码 -出版社
MDPI
DOI: 10.3390/s19235196
关键词
fiber-optic sensor; microfiber; microfiber knot resonator; fiber-optic sensor; relative humidity sensor; gas sensor; sensitive materials
资金
- Joint Research Project for Outstanding Research Institutions by the Gimhae Industry Promotion and Biomedical Foundation (GIBF)
Recent research and development progress of relative humidity sensors using microfiber knot resonators (MKRs) are reviewed by considering the physical parameters of the MKR and coating materials sensitive to improve the relative humidity sensitivity. The fabrication method of the MKR based on silica or polymer is briefly described. The many advantages of the MKR such as strong evanescent field, a high Q-factor, compact size, and high sensitivity can provide a great diversity of sensing applications. The relative humidity sensitivity of the MKR is enhanced by concerning the physical parameters of the MKR, including the waist or knot diameter, sensitive materials, and Vernier effect. Many techniques for depositing the sensitive materials on the MKR surface are discussed. The adsorption effects of water vapor molecules on variations in the resonant wavelength and the transmission output of the MKR are described regarding the materials sensitive to relative humidity. The sensing performance of the MKR-based relative humidity sensors is discussed, including sensitivity, resolution, and response time.
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