Theory of Operation DF-745SG
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10 Theory of Operation
10.1The Moisture Measurement
10.1.1
Moisture and the IR Spectrum
Figure 78: Schematic of Moisture Cell
The Nanotrace Moisture analyzer uses infrared (IR) absorption as its detection
method. IR absorption is but a subset of the overall field of “spectroscopy,” which
measures the interaction of light and matter.
The basis of absorption spectroscopy is when an electromagnetic wave (i.e., the
scientific description of “light”) with a particular wavelength impinges on a
substance that absorbs a fraction of the total electromagnetic radiation. The
wavelength of radiation is well known, for instance, in differentiating colors in the
visible light spectrum.
In the infrared spectral region, the wavelength of light overlaps with discrete
absorptions created by molecular vibrations. IR absorption is often used in
diagnosing molecular composition based on “fingerprints” of these absorptions
over a wide wavelength range. Conversely, if the strength of a single vibrational
absorbance is known, a single wavelength is often used to determine the amount of
a particular substance. This is how we measure moisture.
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