| Autor: |
Zorin I; Research Center for Non-Destructive Testing, Linz, Austria., Kilgus J; Research Center for Non-Destructive Testing, Linz, Austria., Duswald K; Research Center for Non-Destructive Testing, Linz, Austria., Lendl B; Institute for Chemical Technologies and Analytics, TU Wien, Vienna, Austria., Heise B; Research Center for Non-Destructive Testing, Linz, Austria., Brandstetter M; Research Center for Non-Destructive Testing, Linz, Austria. |
| Jazyk: |
angličtina |
| Zdroj: |
Applied spectroscopy [Appl Spectrosc] 2020 Apr; Vol. 74 (4), pp. 485-493. Date of Electronic Publication: 2020 Feb 25. |
| DOI: |
10.1177/0003702819893364 |
| Abstrakt: |
Fourier transform infrared (FT-IR) spectrometers have been the dominant technology in the field of mid-infrared (mid-IR) spectroscopy for decades. Supercontinuum laser sources operating in the mid-IR spectral region now offer the potential to enrich the field of FT-IR spectroscopy due to their distinctive properties, such as high-brightness, broadband spectral coverage and enhanced stability. In our contribution, we introduce this advanced light source as a replacement for conventional thermal emitters. Furthermore, an approach to efficient coupling of pulsed mid-IR supercontinuum sources to FT-IR spectrometers is proposed and considered in detail. The experimental part is devoted to pulse-to-pulse energy fluctuations of the applied supercontinuum laser, performance of the system, as well as the noise and long-term stability. Comparative measurements performed with a conventional FT-IR instrument equipped with a thermal emitter illustrate that similar noise levels can be achieved with the supercontinuum-based system. The analytical performance of the supercontinuum-based FT-IR spectrometer was tested for a concentration series of aqueous formaldehyde solutions in a liquid flow cell (500 µm path length) and compared with the conventional FT-IR (130 µm path length). The results show a four-times-enhanced detection limit due to the extended path length enabled by the high brightness of the laser. In conclusion, FT-IR spectrometers equipped with novel broadband mid-IR supercontinuum lasers could outperform traditional systems providing superior performance, e.g., interaction path lengths formerly unattainable, while maintaining low noise levels known from highly stable thermal emitters. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
|
