用激光技术测定液体中的声速和等熵压缩性系数

Sound Velocity and Isoentropic Compressibility Measurments in Liquid with Laser Photoacoustic Technique

本文应用根据激光光声原理和技术建立的流体热力学性质测量实验装置，测定了七个温度下苯、四氯化碳液体中，苯与四氯化碳二元溶液中的声速（ｕ）、密度（ρ），计算了等熵压缩性系数（Ｋ＿ｓ）等热力学数据。用多项幂级数，以最小二乘法拟合声速ｕ与温度ｔ的数学关系。实测的声速值与文献值比较，相对误差小于０．０４％，等熵压缩性系数与文献数据也相当吻合。

A laser photoacoustic deflection technique has been used for measuring speeds of sound and isoentropic compressibilities of benzene. carbon tetrachloride, and benzene +carbon tetrachloride. Their densities were also measured. Speeds of sound were expressed by polynomials as function of temperature. The results obtained are in good agreement with that of literature.