According to the Fresnel formula,the law of the natural light energy distribution is derived in the process of reflection and refraction.And the distribution of energy is also discussed when light acts by especial angle of incidence.At last,the energy distribution of natural light is simply narrated in uniaxial crystal.

Icing on aircraft skin brings a serious risk to aircraft safety. At present, removing ice is usually conducted by spraying deicing fluid. Even so, the ice on the skin cannot be eliminated completely. Therefore, it is needed to find a fast and accurate detection method to detect the location and area of the residual ice on the aircraft skin. Among numerous nondestructive testing methods, optical fiber detection is an effective method. However, the impact of aircraft coatings has not been considered by the existing fiber detection methods. In fact, coatings have great influences on the icing detection result if optical sensors are used. To solve this problem, a fiber endface echo model based on the dual-flux theory is established, and the reflection characteristics of coatings on aircraft skin are studied in this article. The detection principle of aircraft residual icing based on optical fibers and the model are introduced. Characteristics of aircraft skin coatings and possible impacts on detection of residual ice are described. The reflection law of the fiber end face is discussed. The experiments are carried out and the obtained reflection law of different color painting is validated. The impact of aircraft skin coatings on the aircraft residual ice detection can be effectively eliminated, and the detection accuracy can be improved. Keywords-fiber optical sensor; aircraft skin; coatings; reflection characteristic

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Energy Distribution of Natural Light in the Process of Reflection and Refraction

Citations

Study on Reflective Characters of Aircraft Skin Coating Based on Fiber End - face Echoes

References

Study on Reflective Characters of Aircraft Skin Coating Based on Fiber End - face Echoes

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