323,548 research outputs found
Measurement of Thermal Noise in Multilayer Coatings with Optimized Layer Thickness
A standard quarter-wavelength multilayer optical coating will produce the
highest reflectivity for a given number of coating layers, but in general it
will not yield the lowest thermal noise for a prescribed reflectivity. Coatings
with the layer thicknesses optimized to minimize thermal noise could be useful
in future generation interferometric gravitational wave detectors where coating
thermal noise is expected to limit the sensitivity of the instrument. We
present the results of direct measurements of the thermal noise of a standard
quarter-wavelength coating and a low noise optimized coating. The measurements
indicate a reduction in thermal noise in line with modeling predictions.Comment: 8 pages, 14 figure
Photoemissive coating
Polystyrene coating is applied to holographic storage tube substrate via glow discharge polymerization in an inert environment. After deposition of styrene coating, antimony and then cesium are added to produce photoemissive layer. Technique is utilized in preparing perfectly organized polymeric films useful as single-crystal membranes
A method of determining combustion gas flow
Zirconium oxide coating enables the determination of hot gas flow patterns on liquid rocket injector face and baffle surfaces to indicate modifications that will increase performance and improve combustion stability. The coating withstands combustion temperatures and due to the coarse surface and coloring of the coating, shows the hot gas patterns
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