Internal structure of laser supported detonation waves by two-wavelength Mach-Zehnder interferometer

Journal Article · Fri Apr 15 00:00:00 EDT 2011 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.3574922· OSTI ID:21560194

Shimamura, Kohei; Kawamura, Koichi; Fukuda, Akio; Bin, Wang; Yamaguchi, Toshikazu; Komurasaki, Kimiya ^[1]; Hatai, Keigo; Fukui, Akihiro; Arakawa, Yoshihiro ^[2]

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1. Department of Advanced Energy, University of Tokyo, 5-1-5 Kashiwa-no-ha, Kashiwa, Chiba 277-8561 (Japan)
2. Department of Aeronautics and Astronautics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-8656 (Japan)

Characteristics of the internal structure of the laser supported detonation (LSD) waves, such as the electron density n{sub e} and the electron temperature T{sub e} profiles behind the shock wave were measured using a two-wavelength Mach-Zehnder interferometer along with emission spectroscopy. A TEA CO{sub 2} laser with energy of 10 J/pulse produced explosive laser heating in atmospheric air. Results show that the peak values of n{sub e} and T{sub e} were, respectively, about 2 x 10{sup 24} m{sup -3} and 30 000 K, during the LSD regime. The temporal variation of the laser absorption coefficient profile estimated from the measured properties reveals that the laser energy was absorbed perfectly in a thin layer behind the shock wave during the LSD regime, as predicted by Raizer's LSD model. However, the absorption layer was much thinner than a plasma layer, the situation of which was not considered in Raizer's model. The measured n{sub e} at the shock front was not zero while the LSD was supported, which implies that the precursor electrons exist ahead of the shock wave.

• OSTI ID: 21560194
• Journal Information: Journal of Applied Physics, Vol. 109, Issue 8; Other Information: DOI: 10.1063/1.3574922; (c) 2011 American Institute of Physics; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ABSORPTION
BEVERAGES
CARBON DIOXIDE LASERS
DETONATION WAVES
ELECTRON DENSITY
ELECTRON TEMPERATURE
EMISSION SPECTROSCOPY
EXPLOSIONS
EXPLOSIVES
LASER-RADIATION HEATING
LAYERS
MACH-ZEHNDER INTERFEROMETER
PEAKS
PLASMA
PLASMA PRODUCTION
PRECURSOR
PULSES
THIN FILMS
VARIATIONS
WAVELENGTHS
FILMS
FOOD
GAS LASERS
HEATING
INTERFEROMETERS
LASERS
MEASURING INSTRUMENTS
PLASMA HEATING
SHOCK WAVES
SORPTION
SPECTROSCOPY