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Electronic circuit design for reciprocal operation of transit-time ultrasonic flow meters

机译：时差式超声波流量计的往复操作的电子电路设计

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摘要

The reciprocal operation theory has been used in the circuit design of transit-time ultrasonic flow meters (USMs) to promote their zero flow performances. In this paper, the authors analyzed the transfer functions of the inter-conversion between acoustic and electric signals on each transducer, indicated that the equivalent load consistency for each transducer between the transmitting and the receiving phases would guarantee the transmitting and the receiving transfer functions equal, and thus guarantee the reciprocal operation of the USM system. In order to achieve the "load consistency" condition in practical systems with non-ideal parameters, a method of applying short pulse excitation and fixing the equivalent load in the "free oscillation period" of the transmitting transducer is proposed. Based on this method, several circuit designs are shown in the paper, the impedance preferences are also analyzed. Practical experiments done with these circuits show clear improvement in both promoting the accordance of the signals received in both directions and reducing the zero flow error in the measurement.
机译：往复操作理论已被用于瞬态超声流量计（USM）的电路设计中，以提高其零流量性能。在本文中，作者分析了每个换能器上声信号和电信号之间的相互转换的传递函数，表明在发射和接收相位之间，每个换能器的等效负载一致性将确保发射和接收的传递函数相等。 ，从而保证USM系统的相互操作。为了在具有非理想参数的实际系统中达到“负载一致性”条件，提出了一种在发送换能器的“自由振荡周期”中施加短脉冲激励并固定等效负载的方法。基于这种方法，本文显示了几种电路设计，并分析了阻抗偏好。用这些电路进行的实际实验表明，在促进双向接收信号的一致性以及减小测量中的零流量误差方面，都有明显的改进。

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