We have demonstrated that stimulated Brillouin scattering can be used to measure the velocity of sound in shock-compressed fluids with 1% precision. We have constructed a ruby laser which can be triggered by a Pockels cell as the shock wave reaches a predetermined point in the sample. The primary limit of accuracy is the lack of precise data for the refractive index at higher pressure. We have also measured the shock velocity U s in terms of the material velocity U p. The data have been fitted to the relation Us=1.4932+1.9615Up+0.0750Up2 km/sec for water below 15-kbar shock stress.
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Bloom et al. (1974) studied this question.
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