超声流量计换能器测试和收发电路设计

目录

1绪论 (1)

1.1引言 (1)

1.2课题研究的背景和意义 (1)

1.3国内外研究状况和发展趋势 (2)

1.4本文主要工作内容和结构安排 (5)

2超声流量计的测量原理 (7)

2.1超声波简介 (7)

2.2超声流量计的测量原理 (8)

2.3影响超声流量计测量精度的因素 (10)

2.4本章小结 (12)

3压电换能器测试方法的研究 (13)

3.1压电换能器的基本原理及性能参数 (13)

3.2压电换能器的导纳特性 (15)

3.3压电换能器导纳圆的Multisim仿真测试 (21)

3.4压电换能器的谐振等效电路 (34)

3.5本章小结 (37)

4超声流量计的收发电路设计 (38)

4.1超声流量计收发电路设计总体方案 (38)

4.2驱动激励电路设计 (38)

4.3信号接收放大电路研究 (46)

4.4本章小结 (49)

5实验和结果分析 (50)

5.1压电换能器的等效电路参数测试 (50)

5.2收发电路测试 (62)

6总结和展望 (66)

参考文献 (67)

致谢 (71)

Contents

1Introduction (1)

1.1Introduction (1)

1.2The research background and significance (1)

1.3The situation of research at home and aboard and its development trend (2)

1.4The main content and structure arrangement (5)

2The measuring principle of ultrasonic flowmeter (7)

2.1The of ultrasonic (7)

2.2The measuring principle of ultrasonic flowmeter (8)

2.3Some factors affecting the accuracy of ultrasonic flowmeter (10)

2.4Conclusion of this chapter (12)

3Research of the test methods of piezoelectric transducer (13)

3.1The basic principle and performance parameters of piezoelectric transducer (13)

3.2The admittance characteristic of piezoelectric transducer (15)

3.3The simulation and test of admittance based on Multisim (21)

3.4The equivalent circuit of piezoelectric transducer (34)

3.5Conclusion of this chapte (37)

4Design of the transducer and transceiver circuit diagram (38)

4.1The general scheme of transducer and transceiver circuit (38)

4.2The drive excitation circuit (38)

4.3The signal receiving and amplifying circuit (46)

4.4Conclusion of this chapter (49)

5The experiments and result analysis (50)

5.1The parameter test of piezoelectric transducer (50)

5.2The test of the transducer and transceiver circuit (62)

6Summary and prospect (66)

Main Reference Documents (67)

Acknowlegement (71)