- Author
- Billmeyer, F. W., Jr.
- Title
- Colorimetry of Fluorescent Specimens: A State-of-the-Art Report.
- Coporate
- Rensselaer Polytechnic Inst., Troy, NY
- Sponsor
- National Bureau of Standards, Washington, DC Department of Labor, Washington, DC
- Report
- NBS GCR 79-185, October 1979, 47 p.
- Distribution
- Available from National Technical Information Service
- Contract
- AB3306
- Keywords
- color | colorimetry | fluorescent | fluorescent specimens | measurement
- Abstract
- Accurate measurement of the color of fluorescent specimens, independent of instrument parameters, is very difficult because such materials absorb radiant power in one wavelength region (the excitation region) and emit power in a region of longer wavelengths (the emission region). There is a complicating overlapping wavelength region in which both excitation and emission take place. Measurement of the spectral radiance factors of fluorescent specimens, the quantity correlating with their visual appearance, requires the use of a spectrophotometer in which the specimen is irradiated by the exact source designed for the visual observations. Bidirectional illumination and viewing, normally 45 (deg)/O (deg) must be used, since in the more common intergrating-sphere arrangement the sample itself alters the irradiation away from that desired. Conformance to better color specifications require irradiation by an source identical to CIE standard daylight illuminant D65(Subscript), irradiation. A proposed field test method and instrument are described. Recommendations for implementing these techniques are made for both short-term and long-term time frames.