Journal
APPLIED SCIENCES-BASEL
Volume 12, Issue 10, Pages -Publisher
MDPI
DOI: 10.3390/app12105057
Keywords
optical sensing; quantum cascade laser; laser absorptions spectroscopy
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Funding
- Central Innovation Programme (ZIM) of the Federal Ministry for Economic Affairs and Energy, Germany [KF2612803DF4]
- QuantumPascal project from the EMPIR programme [18SIB04]
- European Union
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This study presents a sensing technique using quantum cascade lasers for high-precision temperature and/or CO2 concentration measurements in gases at room temperature. By recording absorption spectra of CO2 transitions, the method achieves high measurement accuracy and sampling rates.
A quantum cascade laser-based sensing technique is presented which allows for in situ high-precision temperature and/or CO2 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 CO2 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 sigma) 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 CO2 concentration measurements on a breath simulator controlled gas flow were performed to demonstrate response-time and sensitivity for an application-driven test system.
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