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HIGH PERFORMANCE UV/VIS
CCD SPECTROPHOTOMETERS
and FIBER OPTIC ACCESSORIES
www.si-photonics.com
UV/Vis spectrophotometers and fiber optic sampling accessories for spectroscopy UV/Vis software, quantitation, colorimetry, radiometry and kinetics software options spectroscopy related research and UV/Vis spectrophotometer product information S.I. Photonics company information S.I. Photonics contact information
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CCD Detection in Spectroscopy
CCDs (Charge Coupled Devices) offer state of the art scientific detection in a remarkably compact package. These integrated circuit silicon imagers offer the ultimate in spectroscopic performance including high speed, low noise and outstanding sensitivity. Additionally these devices are extremely rugged and durable unlike PMTs (Photo-multiplier Tubes) and unlike PMTs, a CCD allows for simultaneous data acquisition over the entire wavelength region.
Spectroscopy array detector
CCD detectors have revolutionized the field of spectroscopy and have become the detector of choice in UV/Vis, Emission spectroscopy and Raman spectroscopy. CCDs are multi-channel, silicon array detectors in which photosensitive semiconducting silicon pixels collect incident light and transfer this charge in a step wise process. The CCD imagers used in the 400 Series Spectrophotometers are high performance linear arrays. A CCD array detector provides the ability to acquire a full spectrum in the time it takes a scanning unit to sample a single wavelength.

The standard CCD used in the Model 410 and Model 420 UV/Vis spectrophotometers is a 2048 pixel device. The device used in the Model 430 and Model 440 spectrophotometers is a low noise, high sensitivity 3,648 pixel device offering improved resolution. Both detectors offer high-speed, full spectrum data acquisition. Additionally, both detectors are fitted with order sorting filters for elimination of unwanted second and third order emissions. These detectors exhibits high quantum efficiency and readout noise which is 100 x lower than conventional photodiode array detectors. This high sensitivity, coupled with an efficient spectrometer design, means that far less light is necessary for accurate absorption measurements, which in turns results in lower potential for sample heating and photo-oxidation.

Key features to look for are when choosing a detector include the number of pixels, pixel dimensions, detector sensitivity and associated noise.
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