Bomem-GRAMS User's Guide
Bomem-GRAMS User's Guide
Bomem-GRAMS User's Guide
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APPENDIX D<br />
GLOSSARY<br />
Note: The following terms are defined as they are used in ABB manuals.<br />
absorbance (also called optical density or extinction)<br />
A measure of the amount of light absorbed as it passes through a sample.<br />
The absorbance A is the logarithm of the ratio of the intensity I 0 of the light<br />
striking the sample to the intensity I of the light which passes through<br />
the sample.<br />
I<br />
0 1<br />
A = log10 = log10<br />
I T<br />
The absorbance is equal to the logarithm of the reciprocal of<br />
the transmittance T.<br />
absorbance spectrum<br />
The absorbance of a sample as a function of the frequency or wavelength<br />
over a given spectral range.<br />
The absorbance spectrum is calculated point-by-point from the sample and<br />
reference spectra as follows:<br />
analyzer<br />
⎛<br />
Absorbance = −log<br />
10⎜<br />
⎝<br />
sample<br />
reference<br />
A complete system for FT-IR or FT-NIR analysis (see Figure D-1).<br />
⎞<br />
⎟<br />
⎠<br />
<strong>Bomem</strong>-<strong>GRAMS</strong> <strong>User's</strong> <strong>Guide</strong> 47
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