一种最优码宽的Barker码超声液位测量技术研究

A New Ultrasonic Liquid Level Measurement Based on the Optimal Code-width of Barker Code

超声编码发射技术是一种有效的提高超声测量精度的方法。通过实验验证,提出了在超声测量中,采用最优码宽的13位Barker数字编码激励,并结合匹配滤波解码压缩的方法替代传统的单脉冲激励的方法,通过对回波信号能量压缩以及对测量系统的优化。并且在实验的基础上加入渡越时间的修正量,形成了新的超声液位测量技术;并通过实验进行验证。仿真和实验结果表明,液面静止状态下,巴克码激励方式渡越时间修正前与修正后测量绝对误差比单脉冲激励方式,分别最少减小0.631 mm和1.617 mm。与传统的单脉冲测量在分辨率、信噪比等方面比较,编码激励技术能有效地改善超声测量的精度,具有较强的实际应用价值和市场前景。

Ultrasonic coding excited technology is an effective method that improves the accuracy of ultrasonic measuring. A new ultrasonic liquid level measurement technology was formed which was verified through experi- ments by using 13-Bit Barker encoding excited with the method of decoding compression matched filtering , instead of using the traditional single pulse excited as the wave transmission, echo signal energy compression technology, measurement system optimization and revising the escape time by experiment. The experimental results showed that the measuring absolute error decreased at least 0. 631 mm of the Barker code wave driving method and decreased at least 1. 617 mm after revising the escape time compared with the single impulse modulated wave driving method when the liquid was at rest, compared with the traditional single pulse excited on resolution, signal-to-noise ratio （SNR） and so on. The encoding excited technology could improve the accuracy of ultrasonic liquid level measur- ing, and it had strong practical applied value and market prospect.