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- W2013156013 abstract "Spectral measurements of the directional hemispherical reflectance of samples exhibiting variant reflection behavior were performed in the near and mid infrared spectral region using the integrating sphere method. The main components of the experimental setup were a sphere with a diffuse gold coating and a commercial Fourier transform spectrometer for the spectral analysis of the radiation incident on and reflected by the sample which is located in the center of the sphere. The capability of the device to measure absolute reflectances was tested with polished slices of high purity silicon and germanium, the reflectances of which can be calculated from the refractive indices. Agreement between the measured and calculated values was found to be within 0.01. Diffuse reflectance standards are not yet available in the infrared. The uncertainty of absolute reflectance measurements is estimated to be ±0.02. Several examples of chemical and technical applications are presented. A relatively low spectral resolution, 16 cm −1 , was used to keep the measurement times short, within the range of a few minutes, thereby minimizing signal drifts. Higher resolution, sometimes necessary for special purposes in chemical analysis, can be attained by longer measurement times. No extensive sample preparation and adjustment is necessary besides the choice of the desired angle of incidence." @default.
- W2013156013 created "2016-06-24" @default.
- W2013156013 creator A5048684851 @default.
- W2013156013 date "1983-01-01" @default.
- W2013156013 modified "2023-10-03" @default.
- W2013156013 title "Fourier Transform Reflectance Spectrometry between 8000 cm<sup>−1</sup> (1.25 μm) and 800 cm<sup>−1</sup> (12.5 μm) Using an Integrating Sphere" @default.
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- W2013156013 doi "https://doi.org/10.1366/0003702834634163" @default.
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