常用的高温高压液体声速透射测量方法及装置采用“固定”的探头间距，测量前需要刻度探头间距(液体层厚度)和探头零时(如有晶片保护壳)，使用不便。基于微分形式的速度定义和恒压舱设计，开发一种可保持测试液体温度、压力恒定的“变”探头间距的透射测量新方法和装置。通过由多个探头间距增量和走时增量比值的平均值或者应用图解法确定声速，能够避免探头零时和探头间距的刻度问题。应用结果表明，新方法测量的蒸馏水以及NaCl盐水溶液声速值与标准值和文献报导值的相对偏差小于0．5%，精度较为可靠。%A fixed distance between transmitting and receiving senor is widely adopted in measurement methods and devices for acoustic velocity of liquid under high temperature and high pressure conditions. The frequent calibration of the distance and delay time is necessary and complex thus makes it incontinent in the field measurement. A novel measurement method and device are developed based on differential velocity and isobaricchamber technology, in which the pressure and tempera-ture keep constant while the distance between transmitting and receiving senor can vary. The acoustic velocity of liquid can be measured by the average ratio of distance increment and travel time increment or through graphical method without the cal-ibration of distance and delay time. The results demonstrate that the device works well:the relative deviation between the ve-locities of distilled water and NaCl brine is less than 0. 5% compared with the published data.
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