Evaluating Applications of Field Spectroscopy Devices to Fingerprint Commonly Used Construction Materials (2013) / Chapter Skim
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67 A p p e n d i x d Field Operation Manual for portable Attenuated Total Reflectance Fourier Transform infrared Spectroscopy 1. Scope and Overview 1.1 This manual covers the use of field-portable attenuated total reflectance Fourier transform infrared (ATR-FTIR)
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68 that protrudes a very small distance (on the order of microns) above the IRE; thus close contact of the sample with the IRE is required to obtain a high-quality spectrum.
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69 5.7 Perform spectral processing as needed. Such tasks can be completed on most spectroscopy programs and typically include baseline subtraction, conversion of ATR units to absorbance units, and atmospheric correction, which involves removal of bands associated with water vapor and carbon dioxide.
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70 4. Sampling 4.1 Use precaution to ensure that sample selection is random and that measurements are an accurate representation of the true composition of the entire quantity of material in question.
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