2. 2
How does a conventional FTIR spectrometer work
• A Michelson interferometer consists of two perpendicular mirrors and a
beamsplitter. One of the mirrors is stationary and another one is movable
• The beam splitter reflects half and transmits the other half of the light and the
light beams are subsequently recombined after being reflected by the mirrors
• Constructive interference between transmitted and reflected light beams
happens if path length of beams differ by 2*D= n*l where D = displacement of
mirror and n = 0,1,2,3..
Displacement is measured with respect to default position( zero path difference)
• Deconstructive interference occurs if 2*D= (n+1/2)*l
• Issues with conventional FTIR technology
• Slow, as for each wavelength l the moving mirror has to be repositioned
• Sensitive to vibrations as it effects accuracy of positioning of moving mirror
• Performance (Spectral resolution) depends on position accuracy of mirror
3. 3
How does our static FTIR spectrometer work
• Spectrolytic’s static FTIR spectrometer uses a patented optical design
to create the interference pattern.
• The optical design does not contain any moving parts and it is therefore
very robust and suitable for portable/harsh environment applications
• Spectrolytic’s technology is able to process all wavelengths in parallel with no
need for any mechanical positioning or tuning.
• The speed of the spectrometer (currently at 50Hz) is only limited by the
speed of the detector read-out and the emitter frequency
• The spectral resolution of the system is limited by the resolution of the
detector.
• Spectrolytic’s static FTIR is about a factor 10 faster then conventional FTIRs
4. 4
Key features of the static FTIR
• Configurations: Transmission, ATR, Gas, Reflection
• Spectral range: 2.5um – 15.5um or 7.0um – 15.5um
• Spectral resolution: 16cm-1 or 6cm-1
• Measurement time: 1Hz to 50Hz max
• A to D converter: 16 bit
• Operating temp: 0 - 50˚C
• Power: 12V DC,10W
• Therm. stabilization: Yes
• Protection class: IP54
• Interface: Ethernet, USB
• Software: Compatible with SphinxSuite
5. 5
Key performance parameter of static FTIR
• Excellent agreement between
measured polystyrene spectra
from sFTIR (solid line ) and
conventional high resolution FTIR
spectrometer (dotted line)
• Excellent SNR ratio for sFTIR
• Wavelength range can be extended
very easily
• High measurement speed and
good SNR makes the sFTIR an ideal
solution for many applications
6. 6
Key application of the static FTIR
All applications where the combination of measurement speed, robustness
and accuracy matters.
ATR Configuration
– High speed medical analysis (Bacterial analysis, Blood sample screening, etc)
– Real time process monitoring (Chemical process monitoring, Pharmaceutical industry, Brewing industry)
Transmission Configuration
– Measurement of fast moving samples (printing industry, paper, foils, etc)
– Liquid pumping systems
Gas Configuration
– Shipping container degassing
– Many other multi-gas application (semiconductor industry, MEMs Industry etc)
– Gas cell with up to 1,5m path length
– Open path implementation (Oil platform, Explosive detection, etc)
