| Autor: |
Herklotz, Frank, Rubin, Tom, Sinnreich, Malte, Helmke, Alexander, von Haimberger, Theodore, Heyne, Karsten |
| Předmět: |
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| Zdroj: |
Applied Sciences (2076-3417); May2022, Vol. 12 Issue 10, p5057, 9p |
| Abstrakt: |
A quantum cascade laser-based sensing technique is presented which allows for in situ high-precision temperature and/or CO 2 concentration measurements of gases in the room temperature regime with sampling rates up to about 40 kHz. The method is based on Boltzmann-like thermally populated fundamental and hot-band rovibrational transitions of CO 2 with opposite temperature dependence. Single absorption spectra at about 2350 to 2352 cm − 1 are recorded by a nanosecond frequency down chirped IR pulse of a pulsed distributed feedback quantum cascade laser (intrapulse mode). The statistical uncertainty (1 σ) in the temperature measurement within one laser pulse is about 1 K and can be further reduced down to about 0.1 K by time averaging over 100 ms. Online temperature and CO 2 concentration measurements on a breath simulator controlled gas flow were performed to demonstrate response-time and sensitivity for an application-driven test system. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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