Fraunhofer Institute for Physical Measurement Techniques IPM
Fraunhofer Institute for Physical Measurement Techniques IPM

Group Spectroscopy and Process Analytics

“Nitrous oxide is about 300 times more harmful to the climate than carbon dioxide. We develop measurement systems that can measure the gas in the field.“

The group’s research focus lies on developing spectroscopy systems for the detection and analysis of liquids and gases. Our primary method is laser spectroscopy, but we also use methods like Raman, FTIR and ATR spectroscopy. We use simulation tools as well as suitable analysis methods such as Fourier and energy dispersive X-ray spectroscopy (EDX) to develop optical components and electronics modules and to characterize them, for instance by inspecting degradation and stability. The group has many years of experience in exhaust gas measuring technology and calorific value analytics, covering rapid gas analyzers for engine test benches used in engine development and systems for monitoring calorific value in natural gas pipelines. Our remote gas detection systems rely on laser spectroscopy and infrared imaging measurement technology to locate leaks and are used in remote safety monitoring for industrial facilities and gas lines. In the area of liquid analysis, we develop ATR process spectrometers for quality control in beverage industry and fermenting processes.

Spectroscopy analytics

  • Optical trace gas analyzers based on laser spectroscopy: sensitivity in the ppb range for N2O and NH3, in the ppm range for O2
  • Raman spectroscopy: analysis of liquids, biological samples, solid-state materials, or gases
  • ATR spectroscopy: measurement of dissolved substances in liquids down to the ppm range
  • Photoacoustic measurement methods, individual acoustic resonator tuning

Optical systems

  • Simulations: optics, mechanics, flow, electronics
  • Detection of optical backscattering, imaging system
  • Systems for laser spectroscopy in the NIR and MIR based on mirror optics
  • Special optical setups: long-path absorption cells, EUV diffraction gratings, laser packages including collimators, reference systems
  • In-situ measurement methods

Evaluation methods

  • Chemometric methods for analyzing measurement data
  • Determining the measurement accuracy and reliability of gas sensors and laser systems under different conditions
  • Modeling as a basis for linearization and calibration-free spectroscopy