Effect optical coatings

Resonant photoacoustic gas spectrometry was adapted to fiber optic sensor technology32 as early as in 1984. A Mach-Zehnder arrangement was combined with a resonant photoacoustic cell for gap analysis. The pollutant gas NO2 was detectable in a concentration of 0.5 ppm. In a smart optical fiber hydrogen sensor, the fiber is coated with palladium metal which expands on exposure to hydrogen. This changes the effective optical path length of the fiber, which is detected by interferometry33. 

The metal layers frequently consist of chromium (semitransparent absorber metal) or aluminum (opaque reflector metal). Silicon dioxide or magnesium fluoride are the materials mostly used for the dielectric layers. In the case of pigment particles, there is a symmetrical arrangement of the layers, as shown in Figure 5.28, whereas optical coatings can also consist of a system of unsymmetrical layers. All these arrangements are the basis for an optical phenomenon called the Fabry-Perot effect... 

One of the major drawbacks of the LIBS technique is the poor reproducibility of shot-to-shot spectra. This problem arises from various sources including laser instability variations in lens-to-lens distance optic coating or destruction matrix effects (e.g. of the sample composition, degree of homogeneity, colour, moisture content) and the atmospheric conditions. 

McFadden, M. G. and Donigian, D. W., Effects of coating structure and optics on inkjet printability, in Proceedings of the 1999 Coating Conference, Toronto, Canada, 2-5 May 1999, Tappi Press, Atlanta, A, 1999, pp. 169-178. 

Ultra-hydrophobicity, lotus effect, wetting, roughness, optical coating, self-organizing nanostmctures... 

LE Busse, ID Aggarwal. Design parameters for multimode fluoride fibers effects of coating and bending on loss. Optical Fiber Materials and Processing Symposium Mater. Res. Soc. 1990, pp.177-82. Pittsburgh, PA, USA. 

Optical coating(s) (optics) Single- and multilayer film structures used to obtain the desired transmittance and reflectance of radiation from surfaces. The property may be due to the intrinsic property of the material (Example an aluminum reflector) or due to interference effects. A multilayer optical coating is also called an Optical stack. 

Optical coating(s) (decorative, security) Single- and multilayer film structures used to obtain desired visual effects such as color, texture, light scattering, etc. 

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