单波束声学多普勒流速仪设计

Design of Single Beam Acoustic Doppler Velocity Meter

随着现代科技的发展,声学多普勒原理在高科技电子测量设备中得到广泛应用。利用声学多普勒原理进行测速具有测量范围大、测量数据准确、对流场影响小和可用于极低流速测量等特点。在单探头声学多普勒流速仪中,设计一套完整的以STM32F407为核心处理芯片,以及超声波发射电路和小信号超声波接收电路。但是水声环境相当复杂,在高干扰情况下测量结果和真实值存在较大误差。利用卡尔曼滤波技术对流速仪测量的数据进行实时的滤波处理,并且添加自相关算法提高实验数据精确度,进一步优化实验结果。在自然环境下的小河中实验,滤波效果令人满意。

With the development of modem science and technology, the principle of acoustic doppler has been widely used in high-tech electronic measuring equipment.Using the principle of acoustic,doppler velocity measurement has the characteristics of large measurement range, accurate measurement data, small impact of the convection field and can be used for very low velocity flow velocity measurement.The single probe acoustic doppler current meter was designed by a complete set of processing chip with STM32F407 as the core, and the ultrasonic transmitting circuit and the small signa! ultrasonic receiving circuit were designed.But the underwater acoustic environment was very complex, and there was a big error in the measurement results and the real value in high interference. Real time filtering processing was performed by using Caiman filtering technique to measure the data of the ve- locity measurement, and the self correlation algorithm was added to improve the accuracy of the experimental data, further optimize the experimental results.In the natural environment of the river experiment,the filtering effect is satisfactory.