Abstract

Radiative properties of fibers are wavelength and angular dependent. Cross sections of fibers depend on the direction of the incoming radiation. Measurements of the total and diffuse near-normal hemispherical spectral reflectances of polypropylene fibers over two wavelength ranges (0.25-2.5 μm and 2.5-15.5 μm) show that reflectance is higher when fibers are aligned parallel to the cell boundaries and lower when they are oriented perpendicular to the cell boundaries. The insulating property of the material is increased in the first case, and the radiative heat transfer is at a maximum in the second case. The effect of fiber diameter is also shown to give opposite variations for the two wavelength ranges.

Spectroscopic diagnostics of morphological changes arising in thermal processing of polypropylene

Donia Hakoume, Leonid A. Dombrovsky, Didier Delaunay, and Benoit Rousseau
Appl. Opt. 53(12) 2702-2710 (2014)

Anisotropic light propagation in bovine muscle tissue depends on the initial fiber orientation, muscle type and wavelength

Robbe Van Beers, Ben Aernouts, Marlon M. Reis, and Wouter Saeys
Opt. Express 25(18) 22082-22095 (2017)

Radiative properties of dense nanofluids

Wei Wei, Andrei G. Fedorov, Zhongyang Luo, and Mingjiang Ni
Appl. Opt. 51(25) 6159-6171 (2012)

Reflection scanning microscope: influence of the distance and the orientation between the fiber and the sample

N. Cerre, F. de Fornel, and J. P. Goudonnet
J. Opt. Soc. Am. A 10(9) 1909-1917 (1993)

Infrared radiative properties and thermal modeling of ceramic-embedded textile fabrics

David M. Anderson, John R. Fessler, Matthew A. Pooley, Scott Seidel, Michael R. Hamblin, Haskell W. Beckham, and James F. Brennan
Biomed. Opt. Express 8(3) 1698-1711 (2017)