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SPECTROPHOTOMETER

Photonics Spectra
Aug 2003
McPhersonRequest Info
 
SPECTROPHOTOMETER McPherson Inc. has released a spectrophotometer that measures reflectance, transmission, fluorescence, phosphorescence and lifetime of most samples. The Rotospec 1 can characterize metallic, pearlescent, multilayer and diffractive pigments. Background fluorescence can be measured or excluded from measurements to determine true colors. The device features monochromatic illumination and a goniometric sample mount surrounded by the revolving and detecting emission spectrometer, which allows transmission detection at any continuously tunable angle from about 10° to 180°. The company says the reflective optics ensure optimal throughput.


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GLOSSARY
fluorescence
The emission of light or other electromagnetic radiation of longer wavelengths by a substance as a result of the absorption of some other radiation of shorter wavelengths, provided the emission continues only as long as the stimulus producing it is maintained. In other words, fluorescence is the luminescence that persists for less than about 10-8 s after excitation.
phosphorescence
Luminescence is the emission of light from a source that is delayed by more than 10-8 s following excitation.
reflectance
The ratio of reflected flux to incident flux. Unless otherwise specified, the total reflectance is meant; it is sometimes convenient to divide this into the sum of the specular and the diffuse reflectance.
spectrophotometer
An instrument for measuring spectral transmittance or reflectance.
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