D5.2 - IR-Spectroscopy: From Industrial Applications to Novel Integrated IR-Absorption Sensors

SENSOR+TEST Conferences 2011
2011-06-07 - 2011-06-09
Proceedings SENSOR 2011
D5 - Media Properties Sensors
J. Kasberger - Research Center for Non Destructive Testing GmbH, Linz, W. Märzinger - i-RED Infrarot Systeme GmbH, Linz (Austria)
601 - 606


Infrared (IR) spectroscopy is a widely used technique to characterize the composition of chemical substances. Even though IR-spectroscopy is a well established method in chemical labs with high fidelity as well as high flexibility, there is still a strong demand in industrial plants to introduce this powerful method for process monitoring.
Due to the high resolution and high sensitivity, FTNIR (Fourier transform near infrared) – spectroscopy is the most suitable technique for quantitative process monitoring and control. In the recent years, an FTNIR process spectrometer has been developed at the Sensor Technology Department of the Upper Austrian Research GmbH (now RECENDT) and is now distributed by the spinoff company i-RED Infrarot Systeme GmbH. Due to the close cooperation between i-RED and RECENDT, this unique constellation enables applied research projects in inline-process monitoring.
The implementation in a real world chemical process complicates the access to the spectral data, which results in high requirements in the measurement setup and the data processing. The long term experience in chemometrics and the know-how of typical requirements of real world industrial problems makes RECENDT a qualified partner for any kind of process monitoring - for fluids as well as for solids. In this contribution, we will give an overview about the competences in process monitoring existing at RECENDT and i-RED.
In addition to the applied research, focused on process monitoring, we have established fundamental research activities related to IRtechnology at RECENDT. Since the IR-spectroscopy is a well developed measurement method, no significant development at the system level is expected anymore. The situation is somewhat different at the interface sample/IR-radiation. Here, the combination of microsystems technology and IRspectroscopy could facilitate a measurement setup with significantly improved performance. In context with microsystems technology, we are working on a fully integrated IR-absorption sensor, which utilizes a mono-mode waveguide as transducer. Exploiting the IR-absorption in the evanescent field of a monomode waveguide could also be utilized as an alternative to conventional ATR-elements with significantly improved sensitivity. As part of this contribution, we will present an overview of the results obtained with the IR-absorption sensor.