Abstract
In order to improve the performance of fiber sensors and fully tap the potential of optical fiber sensors, various optical materials have been selectively coated on optical fiber sensors under the background of the rapid development of various optical materials. On the basis of retaining the original characteristics of the optical fiber sensors, the coated sensors are endowed with new characteristics, such as high sensitivity, strong structure, and specific recognition. Many materials with a large thermal optical coefficient and thermal expansion coefficients are applied to optical fibers, and the temperature sensitivities are improved several times after coating. At the same time, fiber sensors have more intelligent sensing capabilities when coated with specific recognition materials. The same/different kinds of materials combined with the same/different fiber structures can produce different measurements, which is interesting. This paper summarizes and compares the fiber sensors treated by different coating materials.
Highlights
With the wide application of optical fiber sensors in industrial production and environmental detection, the advantages of optical fiber sensors have been fully reflected
In the first part of this review, we summarize the optical fiber sensors coated with PDMS
hollow core fiber (HCF) directly, a hollow will be created by heating the paraffin, which is coated between the optical fiber and PDMS [38]
Summary
With the wide application of optical fiber sensors in industrial production and environmental detection, the advantages of optical fiber sensors have been fully reflected. In order to meet the requirements of different applications and improve the performance of optical fiber sensors, a variety of sensors with different structures have emerged. To improve the sensitivities of the sensors, many materials with a higher thermo-optical coefficient are coated on the fiber. The same optical fiber structure coated with different materials will have different response characteristics. In the first part of this review, we summarize the optical fiber sensors coated with PDMS and discuss them according to the optical fiber structure. The advantages of PDMS as a coating material and its sensing function in different applications are introduced. In the third part of the review, the different applications of UV-sensitive materials in optical fiber sensing are briefly introduced. The performance of graphene, metal ions and other coating materials in sensing is described
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