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Plasma Emission, Wave Speeds, and Temperatures of Laser-Supported Plasmas in Air

Journal Article · · AIAA Journal
DOI:https://doi.org/10.2514/1.j062334· OSTI ID:2418115
 [1];  [2]
  1. Purdue University, West Lafayette, Indiana 47907; OSTI
  2. Purdue University, West Lafayette, Indiana 47907

A study of the generation and subsequent expansion of plasmas using a single beam (532 nm) from the second harmonic generator of a Q-switched Nd:YAG laser is described. The plasmas in air are studied using an intensified charge-coupled device camera over periods of 1000 ns following the laser pulses. The plasma experimental results are interpreted in terms of wave speeds and plasma temperatures. Energy balance equations are considered to estimate the plasma temperatures and the laser-supported radiation (LSR) and the laser-supported detonation (LSD) wave speeds. Within 1000 ns observation time, the circular spectral images turn elliptical because of plasma expansion toward the laser beam. The plasma expansion increases with increasing laser irradiance. A laser irradiance range of [Formula: see text] yields LSR wave speeds between 45 and 170 km/s and LSD wave speeds of 90–130 km/s. The measured wave speeds are compared with the LSR and the LSR wave speed models. The plasma temperatures are between 90,000 and 120,000 K at 15 ns after the laser pulse based on measured emission spectra and are between 640,000 and 760,000 K at 3 ns based on the LSR model.

Research Organization:
Purdue Univ., West Lafayette, IN (United States)
Sponsoring Organization:
USDOE Office of Fossil Energy (FE)
DOE Contract Number:
FE0011822; FG02-03ER15391
OSTI ID:
2418115
Journal Information:
AIAA Journal, Journal Name: AIAA Journal Journal Issue: 5 Vol. 61; ISSN 0001-1452
Publisher:
AIAA
Country of Publication:
United States
Language:
English

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