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Time-stretch spectroscopy for fast infrared absorption spectra of acetylene and hydroxyl radicals during combustion

Journal Article · · Optics Express
DOI:https://doi.org/10.1364/OE.401737· OSTI ID:1842368

We have developed a diagnostic that uses time-domain spectroscopy to measure transient infrared absorption spectra in gases. Using a time-stretch Fourier transform approach, we can determine pressure, temperature, and gas concentrations with sub-microsecond time resolution for over two milliseconds. We demonstrate high-resolution (0.015 nm), time-resolved spectral measurements in an acetylene-oxygen gas mixture undergoing combustion. Within a 5 µs period during the reaction, the acetylene line intensities decrease substantially, and new spectra appear that are consistent with the hydroxyl (OH) radical, a common by-product in the combustion, deflagration, and detonation of fuels and explosives. Post-reaction pressures and temperatures were estimated from the OH spectra. The technique measures spectra from 1520 to 1620 nm using fiber optics, photodetectors, and digitizers. No cameras or spectrometers are required.

Research Organization:
Mission Support And Test Services LLC, Las Vegas, NV (United States). Nevada National Security Site
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); USDOE National Nuclear Security Administration (NNSA), Office of Defense Programs (DP)
Grant/Contract Number:
NA0003624
OSTI ID:
1842368
Alternate ID(s):
OSTI ID: 1724073
Report Number(s):
DOE/NV/03624--0794
Journal Information:
Optics Express, Journal Name: Optics Express Journal Issue: 20 Vol. 28; ISSN 1094-4087; ISSN OPEXFF
Publisher:
Optical Society of AmericaCopyright Statement
Country of Publication:
United States
Language:
English

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