27-02-2013
What you need to know about UV DOAS

The Ultra-Violet Differential Optic Absorption Spectroscopy (UV DOAS) is an instrument that can be used to determine the amount of trace gases and pollutants present in the air .Its ability to work as a gas detector is based on the Beer-Lambert 'Law of Absorption, which states that the amount of light that is absorbed on its path is directly related to the number of gas molecules it comes into contact with. Since all types of molecules and gases have their own unique absorption spectrum properties, concentrations of various gases in the light path at a particular time can be easily determined.
The instrument's operating system has been proven to be very efficient in detecting toluene , benzene and other trace gases in the air . Numerous tunnel experiments have been carried out to determine its effectiveness. In one such experiment, UV DOAS was used to measure the amount of Ammonia over a distance of a hundred meters. The results indicated that it is very effective in giving precise measurements of the content of Ammonia. Further experiments involving other gases are to be carried out.
Components
The system comprises of a light emitter, a receiver, a power supply, analyzer and fiber optic wire. The emitter's lamp has its own distinct electric supply. The light path includes both the emitter and the receiver. The receiver captures the light which is conducted to the analyzer via an optical fiber cable. The fiber allows installation of the analyzer far away from possible aggressive environments.
UV DOAS system can be applied in multi-path conditions where an optical multiplexer enables transfer of light to one receiver via multiple paths.
Application of UV DOAS
The instrument is widely used in industries and companies to keep track of concentrations of specific gases. It acts as a safety measure to prevent accidents involving chemicals, and also to comply with the requirements of the authorities.


can UV DOAS be calibrated to become an HF analyzer? when calibrated, does it detect any other gases or just the one?
Posted by: Guest | May 30, 2013, 4:42 pm
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