Spectrophotometric Analysis Applications

SpectrumSpectrophotometric Process Analysis

 

The fundamental principle of spectrophotometric analyzers is based on the fact that molecules in a process stream absorb light (more in general, electromagnetic energy) at specific frequencies. In a stream of known composition, it is possible to select one or more electromagnetic spectrum wavelengths that are unique to a component within the stream. An appropriate technique is then employed in which the absorption of energy at the specific frequency from the component is measured.

The Photodiode Array (PDA) detectors are able to detect multiple wavelengths, therefore enabling the analyzers to measure several stream components simultaneously. A common application of PDA detectors includes the measurement of several gases, such as H2O, CO2 and CO in process heater stacks (a measurement typically required as a part of the regulatory permit to operate the heater).

 


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