| Autor: |
Eslami Jahromi K, Nematollahi M, Pan Q, Abbas MA, Cristescu SM, Harren FJM, Khodabakhsh A |
| Jazyk: |
angličtina |
| Zdroj: |
Optics express [Opt Express] 2020 Aug 31; Vol. 28 (18), pp. 26091-26101. |
| DOI: |
10.1364/OE.396884 |
| Abstrakt: |
We present a multi-species trace gas sensor based on a high-repetition-rate mid-infrared supercontinuum source, in combination with a 30 m multipass absorption cell, and a scanning grating spectrometer. The output of the spectrometer is demodulated by a digital lock-in amplifier, referenced to the repetition rate of the supercontinuum source. This improved the detection sensitivity of the system by a factor 5, as compared to direct baseband operation. The spectrometer provides a spectral coverage of 950 cm -1 (between 2.85-3.90 µm) with a resolution of 2.5 cm -1 in 100 ms. It can achieve noise equivalent detection limits in the order of 100 ppbv Hz -1/2 for various hydrocarbons, alcohols, and aldehydes. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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