使用并联电阻改善螺栓夹紧式兰姆波换能器的瞬态响应。

Improving the transient response of a bolt-clamped Langevin transducer using a parallel resistor.

作者信息

Chang Kuo Tsi

机构信息

Department of Electrical Engineering, National United University, 1 Lien-Kung Road, Kungjing Li, 36012, ROC, Miaoli, Taiwan.

出版信息

Ultrasonics. 2003 Aug;41(6):427-36. doi: 10.1016/s0041-624x(03)00149-5.

DOI:10.1016/s0041-624x(03)00149-5

PMID:12853079

Abstract

This paper suggests a parallel resistor to reduce DC time constant and DC response time of the transient response, induced immediately after an AC voltage connected to a bolt-clamped Langevin transducer (BLT) is switched off. An equivalent circuit is first expressed. Then, an open-circuit transient response at the terminals induced by initial states is derived and measured, and thus parameters for losses of the BLT device are estimated by DC and AC time constants of the transient response. Moreover, a driving and measuring system is designed to determine transient response and steady-state responses of the BLT device, and a parallel resistor is connected to the BLT device to reduce the DC time constant. Experimental results indicate that the DC time constant greatly exceeds the AC time constant without the parallel resistor, and greatly decreases from 42 to 1 ms by a 100-kOmega parallel resistor.

摘要

本文提出了一种并联电阻，以减小瞬态响应的直流时间常数和直流响应时间，该瞬态响应是在连接到螺栓夹紧兰姆波换能器（BLT）的交流电压关闭后立即产生的。首先给出了等效电路。然后，推导并测量了由初始状态在终端引起的开路瞬态响应，从而通过瞬态响应的直流和交流时间常数估算了BLT器件的损耗参数。此外，设计了一个驱动和测量系统来确定BLT器件的瞬态响应和稳态响应，并将一个并联电阻连接到BLT器件上以减小直流时间常数。实验结果表明，在没有并联电阻的情况下，直流时间常数大大超过交流时间常数，而通过一个100 kΩ的并联电阻，直流时间常数从42 ms大幅降至1 ms。