Intra-pulse laser absorption sensor with cavity enhancement for oxidation experiments in a rapid compression machine | Zendy

Ehson F. Nasir | Zendy; Aamir Farooq | Zendy

AI Assistant Blog Pricing

Home ZAIA Blog

Open Access

Intra-pulse laser absorption sensor with cavity enhancement for oxidation experiments in a rapid compression machine

Author(s) -

Ehson F. Nasir,

Aamir Farooq

Publication year - 2018

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.26.014601

Subject(s) - materials science , optics , laser , duty cycle , quantum cascade laser , absorption (acoustics) , spectroscopy , pulse compression , absorption spectroscopy , chirp , telecommunications , power (physics) , radar , physics , quantum mechanics , computer science , composite material

A sensor based on a mid-IR pulsed quantum cascade laser (QCL) and off-axis cavity enhanced absorption spectroscopy (OA-CEAS) has been developed for highly sensitive concentration measurements of carbon monoxide (CO) in a rapid compression machine. The duty cycle and the pulse repetition rate of the laser were optimized for increased tuning range, high chirp rate, and small line width to achieve effective laser-cavity coupling. This enabled spectrally resolved CO line-shape measurements at high pressures (P ~10 bar). A gain factor of 133 and a time resolution of 10 μs were demonstrated. CO concentration-time profiles during the oxidation of highly dilute n-octane/air mixtures were recorded, illustrating new opportunities in RCM experiments for chemical kinetics.

The content you want is available to Zendy users.

Already have an account? Click here to sign in.

Having issues? You can contact us here

Accelerating Research