Applications of the Integrating Sphere in the NIR Spectral Region
In the near-infrared (NIR) spectral region most materials develop characteristic and unique absorptions as in the mid-infrared. The specifi c absorbance of most bands is one-to-two orders of magnitude weaker than in the mid-infrared, thus permitting longer pathlength measurements. The relatively weaker absorption also allows materials to be sampled without dilution, which is a major advantage in most industrial and laboratory applications. Excellent light sources and highly sensitive detectors along with the use of rugged and non-hygroscopic optical materials also make NIR the method of choice for practical high throughput analyses.
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