J. G. Mance
Journal of Applied Physics
Researchers at DOE (Department of Energy, United States) undertook experiments to compare temperatures measured simultaneously by pyrometry and Raman spectroscopy in shock-wave-compressed toluene. Comparisons of this type are necessary to validate pyrometry as a temperature diagnostic in dynamic experiments. Additionally, this is also helpful for opaque samples where pyrometric signal is contaminated with possible nonthermal sources of light emission, such as window fractoluminescence.
Temperature dependence of the intensity ratios of anti-Stokes to Stokes Ramanscattered lines of various vibration modes are utilized for the purpose of temperature calculations of the sample. 12 ns pulse length of excitation laser was used to excite the sample and Raman-scattered signal from sample was imaged onto a 300mm long by 1.5mm core quartz optical fiber. After passing through a filter assembly the light entered a fiber-optic bundle that formed a line on its output end at the entrance to an IsoPlane 160 spectrometer paired with an intensified charge-coupled device (ICCD) detector (PI-MAX4). ICCD was useful obtaining desired gain and gating around 12ns laser pulse.