Appendix E FTIR Frequency scale calibrationCalibration Transfer between FTLA2000 and MB3000 systems
AA003700-01 rev. G. 2.0 69
For broad spectral features or low resolution spectroscopy, the mean frequency for
figure 4 is 7299.8 cm-1. However, when measuring the frequency of narrow lines
such as water vapor at 1 cm-1 resolution, the apparent frequency will be higher than
the average frequency because of the strong skew in the curve.
Calibration Transfer between FTLA2000 and MB3000 systems
In the FTLA systems there is no “J” stop in the focal plane of an output focusing
mirror. As a result the illumination is further away from circular symmetric and the
illumination distribution as a function of frequency is more skew for the open beam
case than for the MB3600 when using the same size quartz halogen source
Figure E- 4. Illumination distribution as a function of frequency shift for figure 3
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