VCSEL-based, high-speed, in situ TDLAS for in-cylinder water vapor measurements in IC engines | Zendy

Oliver Witzel | Zendy; Alexander Klein | Zendy; C. Meffert | Zendy; Steven Wagner | Zendy; Sebastian A. Kaiser | Zendy; Christof Schulz | Zendy; Volker Ebert | Zendy

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VCSEL-based, high-speed, in situ TDLAS for in-cylinder water vapor measurements in IC engines

Author(s) -

Oliver Witzel,

Alexander Klein,

C. Meffert,

Steven Wagner,

Sebastian A. Kaiser,

Christof Schulz,

Volker Ebert

Publication year - 2013

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.21.019951

Subject(s) - tunable diode laser absorption spectroscopy , vertical cavity surface emitting laser , optics , materials science , laser , tunable laser , calibration , water vapor , diode , semiconductor laser theory , noise (video) , absorption (acoustics) , cylinder , optoelectronics , physics , mechanical engineering , quantum mechanics , artificial intelligence , meteorology , computer science , image (mathematics) , engineering

We report the first application of a vertical-cavity surfaceemitting laser (VCSEL) for calibration- and sampling-free, high-speed, in situ H2O concentration measurements in IC engines using direct TDLAS (tunable diode laser absorption spectroscopy). Measurements were performed in a single-cylinder research engine operated under motored conditions with a time resolution down to 100 μs (i.e., 1.2 crank angle degrees at 2000 rpm). Signal-to-noise ratios (1σ) up to 29 were achieved, corresponding to a H2O precision of 0.046 vol.% H2O or 39 ppm · m. The modulation frequency dependence of the performance was investigated at different engine operating points in order to quantify the advantages of VCSEL against DFB lasers.

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