FTIR - Fourier transformed infrared spectroscopy (we just call it FTIR)
In simplest terms we shine infrared light – a certain type of light – through gas. Now when infrared light meets a gaseous molecule, the molecule starts vibrating. And because the vibration depends on the construct of the molecule, each molecule has a unique way of vibrating. Thereby the signal we get is different in each type of molecule, and this way we can identify which gas molecule it is.
Makes it possible to identify and measure almost all gases at once with one device.
CVAF – Cold Vapor Atomic Fluorescence
We shine ultraviolet (UV) light at gas, and this causes the mercury atoms in the gas to shine another type of light. By measuring how much of this other type of light there is, we can tell how much mercury there is in the sample.
Most accurate way to measure mercury emissions.