Wang Huaiyang, Hu Shanshan, Liu Zhengshi, Wang Yong
School of Mechanical Engineering, Hefei University of Technology, Hefei, Anhui 230009, China.
Rev Sci Instrum. 2020 Aug 1;91(8):085106. doi: 10.1063/5.0007415.
A combined measurement method on the basis of liquid compressibility and the characteristics of deep sea pressure compensators and pistons is proposed to solve the difficulty in measuring the large pressure of several kilometers of water depth and the small fluctuation pressure of several centimeters of water depth in ocean pressure detection. First, the working principle of the proposed method is introduced. Second, the force of piston is evaluated under static and dynamic pressure measurement conditions, and the corresponding mathematical models are established. Third, the measurement accuracy of static and dynamic pressures is analyzed. Finally, a test platform is built. The results show that the maximum dynamic pressure of 0.025 bar is realized at a pressure changing speed of 0.2 bar/s, and the small fluctuation pressure of 2.8 × 10 bars is realized at a pressure of 20 bars. The measurement system can track the changing ambient pressure in real time, and the measurement accuracy of the small fluctuation pressure is only related to the characteristics of the measurement system itself but not to the external large pressure. The accuracy and feasibility of the proposed method are verified. This study provides a new approach for measuring deep sea large pressure and its small fluctuation pressure.
为解决海洋压力检测中几千米水深的大压力和几厘米水深的小波动压力测量难题，提出了一种基于液体可压缩性以及深海压力补偿器和活塞特性的组合测量方法。首先，介绍了该方法的工作原理。其次，评估了静态和动态压力测量条件下活塞的受力情况，并建立了相应的数学模型。第三，分析了静态和动态压力的测量精度。最后，搭建了测试平台。结果表明，在压力变化速度为0.2 bar/s时实现了0.025 bar的最大动态压力，在20 bar压力下实现了2.8×10 bar的小波动压力。该测量系统能够实时跟踪变化的环境压力，小波动压力的测量精度仅与测量系统本身的特性有关，而与外部大压力无关。验证了所提方法的准确性和可行性。本研究为深海大压力及其小波动压力的测量提供了一种新途径。
