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NRL Arch Reflectivity Measurement
The NRL Arch is the industry standard for testing the reflectivity of materials. Originally designed at the Naval Research Laboratory, the NRL Arch allows for quick, repeatable non-destructive testing of microwave absorbent materials over a wide frequency range. Reflectivity is defined
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Emissivity Measurements of Common Construction Materials
of the emissivity,. absorptivity and reflectivity, the impact of each factor will affect the other factors of the equation. As well the. total absorptivity for solar radiation is different from total emissivity for low-temperature radiation, many. spectral hemispherical emissivity values will vary
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High Spatial Resolution Measurement of Volume Holographic Gratings
diffraction combined with the cyclical. interference from the surface reflections in order to increase the accuracy when measuring uncoated gratings. The. system is capable of simultaneously measuring diffraction efficiency, loss, surface reflectivity, Bragg angle, and. grating tilt in one plane
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Stability of Silicon Photodiodes for Laser Emission Measurements (.pdf)
compared the calibration of P.T.B. and the spectral. tenuation is usually required to prevent flux density satura-. irradiance lamp at two other wavelengths, 450nm and 880nm. tion. The reflectivity of an uncoated silicon photodiode var-. and find better than 2% agreement between the detectors @. ies from
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Gloss Measurement of Tin Films (.doc)
of the observer. It would be useful to the industry if a simple quantitative measurement system were developed to define reliable appearance standards. This can be easily facilitated by convenient measurement of the surface's specular reflectivity, "gloss." This work has been documented
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Anechoic Chamber Measurement Improvement-Microwave Journal
The well known and widely used "Termination-VSWR" method, used to measure the reflectivity of an absorber wall in an anechoic chamber, has been considerably modernized with the help of new vector network analyzers (VNA) and personal computers (PC), taking advantage of fast sweepers or synthesizers
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MICRO: Product Extra!
has developed deep ultraviolet (DUV) coating process improvements that enable excellent lifetime results. The company achieved a new pulse lifetime record for its DUV coatings on an optic produced on a fused silica substrate that is a high reflector for 193 nm, delivering reflectivity of 98.2%
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PAT Advances Freeze Dryer Control
technique but "reflectivity and depth are issues," says Oregon Freeze Dry's Pebley. "It's more a surface, than a penetrating technique." "RGA is usually done with mass spec analysis, to see vapor in the chamber," adds Joe Brower, director of Operations at Cardinal Health in Raleigh, N.C. However