Precise time-resolved mid-infrared radiometry of shocked CCl[sub 4]

Fat’yanov, Oleg V.; Ogura, Toshiyuki; Nicol, Malcolm F.; Kondo, Ken-ichi
April 2000
AIP Conference Proceedings;2000, Vol. 505 Issue 1, p959
Academic Journal
We present the first accurate time-resolved infrared (IR) radiance measurements in two slightly overlapping bands, approximately 7 to 9.5 μm and 9 to 12 μm, for a shock compressed partially transparent inert liquid, CCl[SUB4]. The main features of the two-channel radiometer were fast liquid N[SUB2] cooled, reverse-biased HgCdTe photovoltaic detectors with cut-off frequencies of 100 MHz at 3 dB. Careful analysis of radiance histories based on detailed spectral information allowed us to derive values of the temperature, average absorption coefficients for the shocked material, and reflectivity of the shock front. Shock pressures varied from 3.3 to 9.4 GPa, and the corresponding temperatures ranged from 680 to 1370 K with an uncertainty of 2.5-3% except the lowest temperature which was accurate to ±4.5%. Our equilibrium vibrational temperatures are very consistent with results other groups obtained by pyrometry in the visible and near-infrared. The dependence of the temperature and linear absorption coefficients on pressure clearly indicate the chemical decomposition threshold at 7 GPa reported earlier by other research groups from the data on electrical conductivity and visible light absorption measurements.


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