3.3 - A miniaturized MID-IR-Spectrometer based on a linear variable filter and pyroelectric line array – Monitoring oil condition
- AMA Conferences 2013
2013-05-14 - 2013-05-16
- Proceedings IRS² 2013
- I3 - Spectroscopy and Gas Analysis
- B. Wiesent, D. Dorigo, A. Koch - Technische Universität München (Germany)
- 59 - 64
Miniaturized mid-IR spectrometers have an enormous potential to solve a plurality of different measurement problems. IR-Spectroscopy can be used for qualitative and quantitative measurements of chemical compounds and their concentrations in solid, gaseous and fluid phase. Building the IRspectrometer small, cost effective and robust without any moving parts enables an online or even inline measurement in process monitoring, health monitoring or quality control tasks.
In this paper we present a miniaturized MID-IR spectrometer without any moving parts that operates in the wavelength range from 5.5 - 11 μm (1800 – 900 cm-1). The miniaturized spectrometer is based on a linear variable filter (LVF) as dispersive element mounted on top of a pyroelectric line sensor. The performance of this miniaturized low cost MID-IR spectrometer is demonstrated in an online oil condition monitoring application. Therefore a number of representative used oil samples at different stages of degradation is measured and compared to a FTIR based complimentary analysis.