Frequency Shift Due To Field Of View - ABB MB3000 Series Installation And User Manual

Frequency shift due to Field of View

view defining positions for the MB3000. The source is a SiC glowbar with a 3 x 3
mm hot emitting area.
Location
source focal plane
output focal plane
sample beam focal plane
detector focal plane
location
source focal plane
output focal plane
sample beam focal plane
detector focal plane
Frequency shift due to Field of View
The frequency scale of an FTIR is highly linear. Hence the frequency scale can be
calibrated with one reference frequency realizing that zero frequency is always
fixed. A quick verification of the frequency calibration of an FTIR is to measure a
raw spectrum of ambient air where fine absorption lines indicate the presence of
water vapor. At a resolution of 1 cm
have been identified for calibration verification. These are the lines at 1918 cm
mid IR and 7300 cm
64
Table 10.
Magnification
1
2
2.8
0.467
Table 11.
magnification
1
2
2.8
0.467
-1
-1
for Near IR
Appendix E FTIR Frequency scale calibration
Size limit
1x 2.5 mm partial limiting
3.1 mm partial limiting
sample accessory dependent
1 mm not limiting
size limit
3 x 3mm
4.5 mm
sample accessory dependent
1 mm
, two individual water vapor spectral lines
FOV limit
FOV limit
not limiting
limiting
not limiting
-1
AA003700-01 rev. G. 2.0
for