From gas analyzer to microsystem

Infrared spectroscopy: LED-based filter photometer

From gas analyzer to microsystem

Raman spectroscopy: fiber-coupled measurement system

From gas analyzer to microsystem

Gas analysis based on quantum cascade lasers

From gas analyzer to microsystem

Miniaturized photoacoustic sensor system

From gas analyzer to microsystem

Energy-efficient colorimetric gas sensors

From gas analyzer to microsystem

Autonomous microsystems with integrated sensor technology

Gas and particle measurement

Systems for gas analysis

Fraunhofer IPM has wide experience in the area of spectroscopy from the UV to the mid-infrared spectral range with the focus being on NIR and MIR laser spectroscopy. Supplementary techniques such as Fourier Transform IR spectroscopy (FTIR), photometry, Attenuated Total Reflection (ATR) and Raman spectroscopy are applied according to the measurement task. Decades of experience in the development of quantum cascade and interband cascade lasers (QCL/ ICL) supplement the institute’s expertise.

We develop measurement systems from the first conception to the actual construction of the system according to our customers’ needs. The scope of our work comprises laser characterization, housing, electronics and software development as well as process integration. Highly sensitive detection systems based on single detectors or imaging methods combined with rapid data acquisition and robust automatic data processing are the building blocks of gas measurement systems by Fraunhofer IPM. Reference models and chemometric analyses enable automatic calibration or differentiation in the case of complex gas matrices and spectrally overlapping samples.

The optics of our measurement systems are designed with view to the specific application. Multi-reflection measurement cells of different configurations are at the heart of sample taking in many of our spectroscopy gas measurement systems. Fraunhofer IPM boasts extensive experience in systems technology for individual fields of application such as, for instance, exhaust gas analysis. On that basis we develop rapid sample collection systems which live up to the standard procedures and typical test scenarios on engine test stands.

 

Microsystems

Fraunhofer IPM develops and produces miniature gas sensors, components and sensor systems in microsystems technology for specific applications. These MEMS (»Micro-Electro-Mechanical Systems«) or MOEMS (»Micro-Optoelectro-Mechanical Systems«) comprise application specific semi-conductor gas sensors and colorimetric gas sensors as well as tunable MIR emitters manufactured in thin-film and thick-film technology. Thanks to comprehensive knowledge of relevant materials and an excellent technical infrastructure, we are capable of developing rapid detectors, e.g. for the mid-infrared spectral range.

Miniature modular sensor systems developed by Fraunhofer IPM meet high demands on robustness, reliability and energy efficiency, which makes them suitable for application in mobile systems. A portable gas chromatography system, for instance, is realized by combining a capillary column with a semiconductor gas sensor array. Miniature system components such as IR emitters and absorption cells enable compact filter photometers or photoacoustic measurement systems. A novel compact photoacoustic system, which detects carbon dioxide (CO2) indoors, may serve as an example. Measurement systems by Fraunhofer IPM feature a modular design and comprise evaluation software and control electronics.

Compact, light-weight and energy efficient sensors are required for energy self-sufficient, battery-powered or wireless systems. They are employed for applications as different as sensor networks in disaster control or intelligent labelling of goods. Fraunhofer IPM develops custom-made, energy self-sufficient gas sensors, e.g. for food chain monitoring or the detection of fire gas.

A question of the appropriate wavelength

© Photo Fraunhofer IPM

Spectroscopic methods can be used to examine solids, liquids and gases: light of a certain wavelength is reflected, scattered or emitted by a specimen. This takes place in a specific way, according to the chemical substance, thus permitting qualitative and quantitative information to be derived about the compound under investigation.

In the field of gas and process technology, Fraunhofer IPM uses a wide range of spectroscopic methods. In addition to laser spectroscopy, the expertise of the insitute also extends to many classic methods such as Fourier transform IR spectroscopy (FTIR), photometry, filter, UV and Raman spectroscopy and photoacoustics Thanks to chemometrical evaluation methods, we gain a maximum of information from our measurement data.