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Reflectance measurements using Integrating spheres



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Well suited for reflection measurements on solid or viscous samples, our integrating spheres are nowadays installed in a lot of laboratory applications. The figure above shows exemplary the different components needed for these assemblies of spectral analysis. The light coming from the light source is guided by an optical fibre cable (or an optical fibre bundle - a cluster of optical fibres with round, square or rectangular geometric arrangement at each end to accomplish the transport of light from one place to another or several others) to the illumination port of the integrating sphere. The sample is positioned at the sample port of the sphere and is illuminated directionally by a beam of light. The light reflected from the sample surface is collected by the sphere, and, by means of multiple diffuse reflections, transfers a representative portion of this flux to a detection system. In addition to the directional/hemispherical geometry described above you can analyse the specimen in the hemispherical/directional geometry, in which a lamp inside the sphere is used to provide diffuse illumination on the sample surface, and the detection system views the sample directionally. Via a second fibre or fibre bundle (detection fibres) the reflected light is guided to the fibre optic coupled spectrometer for spectral analysis.



Advantages:
    • Easy handling and fast measurement time
    • Measurement of diffuse and total reflectance of unknown specimens
    • Calculation of directional reflectance
    • Set-up in d/8° as well as in 8°/d - geometry



Principle design of an integrating sphere

An integrating sphere is used to ‘magnify’ light intensity reaching the detectors. The interior walls of the integrating sphere are coated with a nearly perfect diffuse reflectance material such as barium sulphate. Radiation reflected from the sample ultimately reaches the detectors after multiple reflections off the walls of the sphere. A tilting mirror permits measurement of the ratio of the intensity of the radiation reflected from the sample and that reflected off the wall. The figure below shows the general construction of an integrating sphere.




Should you have questions concerninxg the technical specification; our application scientists will be pleased to consult you.




Last change 09/27/2007 11:39 AM
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