Title :
A new optical accessory for simultaneous measurements of reflectance and transmittance at continuously variable angles
Author_Institution :
Nat. Inst. of adv. Ind. Sci. & Technol., Japan
fDate :
27 Sept.-1 Oct. 2004
Abstract :
A new optical accessory is equipped with two spheroidal mirrors, which completely cover a sample on the equatorial plane. It is possible to make simultaneous measurements of reflectance and transmittance at continuously variable angles. The geometric mean of two reflectance (or transmittance) values gives us the absolute reflectance (or transmittance) because of the independence of the reflectance difference of the individual mirrors and the optical loss at each mirror. The accessory achieves spectral measurements with high accuracy and within a short period of time and is designed as it can be incorporated into commercial spectrometers.
Keywords :
mirrors; optical losses; optical variables measurement; absolute reflectance; commercial spectrometers; continuously variable angles; equatorial plane; geometric mean; optical accessory; optical loss; reflectance measurements; spectral measurements; spheroidal mirrors; transmittance measurements; Geometrical optics; Goniometers; Infrared spectra; Mirrors; Optical attenuators; Optical beams; Optical devices; Optical losses; Reflectivity; Spectroscopy;
Conference_Titel :
Infrared and Millimeter Waves, 2004 and 12th International Conference on Terahertz Electronics, 2004. Conference Digest of the 2004 Joint 29th International Conference on
Print_ISBN :
0-7803-8490-3
DOI :
10.1109/ICIMW.2004.1422009
