Tuesday, November 27, 2018

Working Principle of Flame Photometer

The flame photometer principle of operation is straightforward. Under analysis, the fluid is sprayed with a non-shiny flame in the form of fine mist, which becomes colored as per to the characteristic emissions of the elements, for example, Sodium (Na) 589 nm, Potassium (K) 768 nm, Calcium (Ca) 622 nm, and Lithium (Li) 671 nm. 

A photodetector that sees the flame through a particularly narrow-band optical filter which passes only the wavelength centered on the characteristic emission of the elected element observes the flame. The photo detector's output is fed to electronic modules, which offer digital readings of the concentration of the preferred element. 

The system is required to be standardized with the known concentrations of the solution for elements of interest, prior to analyzing the unknown fluid sample. In a measurement setup, with the help of a compressor, compressed air is provided to an atomizer, because of a draught of air at the tip of an atomizer, in the mixing chamber sample solution is sucked and entering into the mixing chamber. On a controlled pressure, liquid petroleum gas (LPG) is also used in the mixing chamber, Here the atomized sample and gas is travel to the burner and is ignited.

The light from the flame is emitted and is composed by the optical lenses and sent through a selected filter to the detector of the flame photometer. The output of the detector processed electronically and the results of the sample solution are displayed properly.


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