There are some faults for the current ultrasonic pressure measurement system,such as large volume,high-energy consumption,inconvenience,and it can not measure the pressure of liquid in tubule. A minitype integrative equipment in ultrasonic pressure measurement outside tubule is presented. Low-consumption design of emitting circuit and high-speed data collection-storage circuit were used to decrease the energy consumption of system, and a new kind of clamp was designed to improve the stability of e-cho signal.Lithium batteries as the power, and denoising with empirical mode decomposition (EMD) were used to improve the quality of ecio signal. At last,the pressure measurement model was established to calculate the pressure of liquid in tubule.The liquid in multiple tubules in different size were measured to test the measurement precision of system, and experimental results show that the equipment shows advantage on small volume,low-energy consumption and convenience. When we measure the pressure of liquid in tubule with diameter 14mm, the maximal measurement error is less than 8% .%针对当前超声波管外测压设备体积较大、能耗高、使用不方便、不能测量小管径内流体压力的难题,研制了一种小型一体化小管径超声波管外测压装置.该装置通过发射电路、高速采集与存储电路的超低功耗设计,大幅降低了设备功耗；设计了一种新型探头夹具提高了回波信号的稳定性；通过锂电池供电、EMD( Empirical Mode Decomposition)去噪等方式增强了回波信号的质量；建立了较为精确的测压模型,实现小管径内流体的压力测量.对多种不同尺寸的小管径内流体进行了压力测量精度验证试验,试验结果表明:该装置体积小巧、功耗低、使用方便,以内径14mm的小管径内流体压力测量为例,最大测量误差不超过8％.
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