48 . Frontier IR Single-range Spectrometers User's Guide
Atmospheric (CO
2
/H
2
O) Suppression
Atmospheric suppression can be selected in the Setup Instrument Advanced tab (Figure 18).
Figure 18 Setup Instrument Advanced tab in Spectrum
What is atmospheric suppression?
This is an atmospheric correction routine. This routine is more powerful than simple
subtraction, overcoming the following issues:
•
Non-linearity due to resolution
•
The measured spectrum is temperature dependent
•
Lineshape and calibration are affected by J-stop and sample or accessory.
What does atmospheric suppression do?
When
CO2/H2O
is switched on, the software uses a single reference spectrum derived from
high resolution data and our understanding of the instrument to model the lineshape, then
finds the current real instrument parameters by least squares fitting to the measured
spectrum.
Figure 19 Correction of an MIR spectrum at 4 cm
−1
resolution
Содержание Frontier FT-IR
Страница 1: ...FRONTIER IR SINGLE RANGE SYSTEMS User s Guide MOLECULAR SPECTROSCOPY ...
Страница 5: ...Introduction ...
Страница 10: ...10 Frontier IR Single range Spectrometers User s Guide ...
Страница 11: ...Warnings and Safety Information ...
Страница 23: ...An Overview of the Frontier IR Single Range Spectrometers ...
Страница 32: ...32 Frontier IR Single range Spectrometers User s Guide ...
Страница 33: ...Unpacking and Installation ...
Страница 43: ...Using the Spectrometer with Spectrum ...
Страница 49: ...Using the Spectrometer with Spectrum 49 Figure 20 Atmospheric suppression ...
Страница 53: ...Routine Maintenance ...
Страница 68: ...68 Frontier IR Single range Spectrometers User s Guide ...
Страница 69: ...Advanced Maintenance ...
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Страница 89: ...Appendices ...
Страница 100: ...100 Frontier IR Single range Spectrometers User s Guide ...