Understanding Optical Emission Spectrometer / AES ..

Understanding Optical Emission Spectrometer / AES – Applications, Techniques & How OES Works?

An optical emission spectrometer (OES) analyzes a light spectrum emitted by an excited sample, primarily metals, to identify elemental composition and concentrations. The sample is sparked in an argon-filled chamber, creating a plasma. Emitted photons are separated by a diffraction grating into a spectrum for analysis. Early OES used photomultiplier tubes (PMTs), but modern OES employs CCD/CMOS detectors, offering greater flexibility, accuracy, and cost-efficiency. Results are quantitative, expressed in weight percentages.

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