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About UV and Visible Spectrometers

UV and visible spectrometers measure the amount of ultraviolet and visible light transmitted or absorbed by a sample placed in the spectrometer. The wavelength at which a chemical absorbs light is a function of its electronic structure and the intensity of the light absorption is related to the amount of the chemical between the light source and the detector, so a UV / Visible spectrum can be used to identify some chemical species.

UV and visible spectrometers may come with one of three common photometric design systems. Scanning single beam systems can be one of two types of instrument, either a single wavelength light source or a selector for a single wavelength. The light from the lamp is dispersed before reaching the sample cell.  A scanning double beam instrument measures both the transmittance of the sample and solvent at each wavelength simultaneously and computes the ratio. The light from the lamp is dispersed before reaching the sample cell.  All wavelengths pass through the sample and the dispersing element is between the sample and the array detector. This allows the detector to simultaneously record the transmitted light power at multiple wavelengths.  Commonly UV spectrometers and visible spectrometers will have a monochromator, which is used to separate the wavelengths of the light source before the light passes through the sample and enters the detector.

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Products & Services Related to UV and Visible Spectrometers

Atomic Absorption Spectrometers
Atomic absorption spectrometers (AA) use the absorption of light to measure the concentration of gas-phase atoms.
Atomic Emission and Optical Emission Spectrometers
Atomic emission and optical emission spectrometers determine analyte concentration via a quantitative measurement of the optical emission from excited atoms.
Fluorometers
Fluorometers measure the amount of fluorescent radiation produced by a sample exposed to monochromatic radiation.
Infrared Spectrometers
Infrared (IR) spectrometers measure the wavelength and intensity of the absorption of infrared light by a sample.
Mass Spectrometers
Mass spectrometers separate ions by their mass-to-charge (m/z) ratios. They are used to identify compounds by the mass of one or more elements in the compound. They are also used to determine the isotopic composition of one or more elements in a compound.
X-ray Fluorescence Spectrometers
X-ray fluorescence spectrometers (XRFs) use a spectroscopic technique that is commonly used with solids, in which X-rays are used to excite a sample and generate secondary X-rays. 

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Engineering Web: UV and Visible Spectrometers

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McPherson spectrometers, spectrographs and monochromators -...
Spectrometers, Spectrographs and Monochromators
See McPherson, Inc. Information
2000 Building Publications - Estimation of Absorbed Photolytic...
found to be very sensitive to initial UV-visible absorption of the coatings, coating degradation products, anomalous UV absorption of the substrate,
Visible Spectrum Calibration Set (UV Standard) from...
Home UV/Vis/Pharmaceutical Products & Services Accessories & Consumables Consumables UV/ Visible Spectroscopy Consumables for PC Controllable
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