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Real-Time Measurement

EuroPhotonics
Oct 2009
ThetaMetrisis SARequest Info
 
ThetaMetrisis.jpgThetaMetrisis has launched FR-tools, turnkey solutions for real-time measurement and characterization of stacks of transparent and semiabsorbing thin and thick films. Providing reflectance, absorbance and transmittance measurements at the point of interest, they are based on white-light reflectance spectroscopy. Shipped ready for measurement, they include a light source, a spectrometer, a reflectance probe, optical fibre, a sample stage and Windows software.


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GLOSSARY
absorbance
The natural log of the ratio of absorbed intensity over the total intensity which gives a constant value assuming a stable volume as well as energy. In optical physics the absorbance may be defined as the absorption cross section multiplied by the absorbing material length.
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.
spectrometer
A kind of spectrograph in which some form of detector, other than a photographic film, is used to measure the distribution of radiation in a particular wavelength region.  
transmittance
The ratio of the radiant power transmitted by an object to the incident radiant power.
transparent
Capable of transmitting light with little absorption and no appreciable scattering or diffusion.
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