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Bruker Optik GmbH IFS 125M User Manual
2 General
The IFS 125M spectrometer is a mobile high resolution FT-IR spectrometer and has
been designed to perform field operation and precise stratospheric analysis, generate
atmospheric emission studies, and remotely monitor atmospheric pollutants.
Atmospheric pollution can be measured in transmittance, using the sun as active IR
radiation source.
For stratospheric transmittance measurements, the solar radiation is collected by a solar
tracker system, which automatically follows the position of the solar source. It has been
proven that this technique can also be used with the moon as IR source, despite the
orders of magnitude lower radiation power.
2.1 Design
• Compact optics housing
• Detachable interferometer scanning arm
• Purgeable enclosure for interferometer, scanner and detectors
2.2 Optics
• Spectral range starting from the mid-infrared (MIR) region at 450 up to the ultra-
violet range of 45000 cm
-1
• Spectral resolution of 0.008 cm
-1
(optionally: 0.0035 cm
-1
) in the MIR region
• Resolving power of >10
6
• Up to 2 internal detectors
• Permanently aligned, 30° cube-corner mirror interferometer
2.3 Electronics
The spectrometer is equipped with a mobile (separate) electronics unit which uses
Ethernet connectivity, and a 24
V DC power supply. Any modern data system (PC work-
station, laptop etc.), with the OPUS spectroscopy software installed, can be used to con-
trol the spectrometer and perform data processing.
Analog to Digital Conversion (ADC) electronics allow high resolution measurements
from the MIR through the near-infrared (NIR) region, up to the visible and ultraviolet
(VIS/UV) spectral ranges.
Functions such as checking measurement parameters allow fast and reliable FT-IR
spectroscopic measurements. Optical components, e.g, source and beamsplitter, are
electronically coded so that the spectrometer firmware can recognize them.
In addition, the permanent online check of spectrometer components facilitates error
diagnostics and maintenance.