Chaban Ievgeniia, Shin Hyun D, Klieber Christoph, Busselez Rémi, Gusev Vitalyi E, Nelson Keith A, Pezeril Thomas
Institut Molécules et Matériaux du Mans, UMR CNRS 6283, Université du Maine, 72085 Le Mans, France.
Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
Rev Sci Instrum. 2017 Jul;88(7):074904. doi: 10.1063/1.4993132.
We present an optical technique based on ultrafast photoacoustics to determine the local temperature distribution profile in liquid samples in contact with a laser heated optical transducer. This ultrafast pump-probe experiment uses time-domain Brillouin scattering (TDBS) to locally determine the light scattering frequency shift. As the temperature influences the Brillouin scattering frequency, the TDBS signal probes the local laser-induced temperature distribution in the liquid. We demonstrate the relevance and the sensitivity of this technique for the measurement of the absolute laser-induced temperature gradient of a glass forming liquid prototype, glycerol, at different laser pump powers-i.e., different steady state background temperatures. Complementarily, our experiments illustrate how this TDBS technique can be applied to measure thermal diffusion in complex multilayer systems in contact with a surrounding liquid.
我们提出了一种基于超快光声的光学技术，用于确定与激光加热光学换能器接触的液体样品中的局部温度分布曲线。这个超快泵浦-探测实验利用时域布里渊散射（TDBS）来局部确定光散射频移。由于温度会影响布里渊散射频率，TDBS信号可探测液体中局部激光诱导的温度分布。我们证明了该技术对于测量玻璃形成液体原型甘油在不同激光泵浦功率（即不同稳态背景温度）下的绝对激光诱导温度梯度的相关性和灵敏度。此外，我们的实验还说明了这种TDBS技术如何应用于测量与周围液体接触的复杂多层系统中的热扩散。
