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Miniature Spectrometers

May 2011
Acal BFi UK Ltd.Request Info
Suitable for measuring color, the Torus concave grating miniature spectrometers from BFI Optilas International SAS are visible-range (360 to 825 nm) units that deliver stability and low stray light with optical bench throughput. They provide increased sensitivity and throughput for low-level applications. The concave grating improves their thermal stability. Wavelength drift is nearly eliminated, and peak shape stays the same over a wide temperature range. The devices enable precision metrology, fluorescence and absorbance applications with demanding stray light and thermal stability requirements. Other applications include measurement of trace gas amounts in the atmosphere, absorbance of optically dense solutions, fluorescence from solid surfaces and backscattering/fluorescence in solutions and powders, and LEDs, lasers and other light sources. The devices are also useful in medical dosimetry in tissue and biological media.


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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.
concave grating
A reflecting grating ruled on a concave spherical surface that not only disperses the light but focuses the spectrum. The great advantage of this grating lies in the fact that no separate collimating optics are needed.
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.
The science of measurement, particularly of lengths and angles.
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