Technical Background - ABB MB3000 Series Installation And User Manual

Appendix D Calibration Transfer from FTLA to MB3000
Appendix D Calibration Transfer from FTLA to
To transfer calibrations from your older FTLA system to the new MB3000 Series,
no adjustments are needed. However, the IR optical configuration has slightly
changed from the FTLA. The IR source image is a somewhat bigger and better
focused. And by using a Jacquinot stop, a more accurate and reproducible line shape
function is achieved.
The effect is that the accurate wavelength for narrow lines and for broad bands are
the same now while for the FTLA the line asymmetry made the wavelengths for
narrow lines a slightly different from those of broad bands. As a result the
wavelength calibration, based of the atmospheric water vapor, requires a slightly
different value (set at the factory) to insure that spectra of liquids with broad
features will be identical to the FTLA Series. For example, the position of the water
vapor line near 7300 cm
identical spectral response of liquid samples.

Technical background:

The MB3000 Series includes a solid state laser in place of the He-Ne laser in order
to reduce maintenance and improve the spectrometer life span. ABB already have
many years experience of using solid state lasers in his FTIR instruments for
satellites. It is with this expertise in hand that ABB has designed the MB3000
Series.
A "single longitudinal mode" solid state laser provides a single monochromatic
wavelength suitable for reference fringes of the interferometer, but contrary to a He-
Ne laser the wavelength of each solid state laser purchased is likely to be different
from the previous one. So there is no fixed wavelength for these lasers. As well the
wavelength will shift with temperature and applied current.
In the MB3000 Series, the applied current and temperature are carefully controlled.
The temperature is controlled with a small Peltier cooler. So once the MB3000 is up
and running the wavelength will remain stable.
AA003700-01 rev. G. 2.0
-1 -1
is 0.15 cm lower for the MB3600 than for the FTLA for
Technical background:
MB3000
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