Which lamp is used in UV?
Two kinds of lamps, a Deuterium for measurement in the ultraviolet range and a tungsten lamp for measurement in the visible and near-infrared ranges, are used as the light sources of a spectrophotometer. A continuous spectrum of 300 – 3,000 nm is emitted.
Which light source is used in UV spectroscopy?
The light source consists of a Xenon flash lamp for the ultraviolet (UV) as well as for the visible (VIS) and near-infrared wavelength regions covering a spectral range from 190 up to 1100 nm.
What is used in UV spectroscopy?
Ultraviolet Spectroscopy (UVS)
Ultraviolet spectroscopy requires somewhat more costly quartz glass sample holders and quartz or fluoride optical components as well as a different light source than VISS but has become equally accessible and easy to use.
Why do we use a tungsten lamp for UV VIS spectroscopy?
The tungsten filament lamp is commonly employed as a source of visible light. This type of lamp is used in the wavelength range of 350 – 2500 nm. … Tungsten/halogen lamps are very efficient, and their output extends well into the ultra-violet. They are used in many modern spectrophotometers.
What is a hydrogen lamp?
The Hydrogen lamp is a long glass tube filled with Hydrogen gas that is stimulated electrically. … Hydrogen lamp can be used for wavelength calibration in the UV range as it radiates continuously in that range. By contrast, the Hydrogen lamp does not produce a continuous visible spectrum, but discrete lines.
Why do we use deuterium lamps in UV spectroscopy?
(2) Deuterium Lamps
A deuterium lamp requires a large and complex power supply, making it more expensive than a halogen lamp. However, it is one of the few continuous spectrum light sources that is stable in the ultraviolet range. The deuterium lamp has a short emission wavelength of 400 nm, or less.
Which lamp is used in visible region?
Fluorescent lamps are about two to four times more efficient at emitting visible light, produce less waste heat, and typically last ten to twenty times longer than incandescent lamps.
Do deuterium lamps contain mercury?
Deuterium lamps. Deuterium lamps contain deuterium gas and emit UV light; the wavelength range depends on the lamp’s glass material. The lamps emit in one direction only, unlike xenon and mercury-xenon lamps which emit in all directions.
Why is UV used?
UV radiation is widely used in industrial processes and in medical and dental practices for a variety of purposes, such as killing bacteria, creating fluorescent effects, curing inks and resins, phototherapy and suntanning. Different UV wavelengths and intensities are used for different purposes.