| 用LCR波检测零件内部切向应力的实验研究 |
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| 引用本文： | 刘凡,丁杰雄.用LCR波检测零件内部切向应力的实验研究[J].仪器仪表用户,2006,13(3):118-120. |
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| 作者姓名： | 刘凡 丁杰雄 |
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| 作者单位： | 电子科技大学,机械电子工程学院,四川,成都,610054 |
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| 摘 要： | 本文介绍了一种基于声弹性理论,利用临界折射纵波（Critically Refracted Longitudinal．LCR）从表面测量零件内部切向应力的方法．依据固体中超声波传播特性与应力状态的关系,搭建了基于传播声时的实验测量系统．在传播声时的测量中采用“过零检测”方式减小由超声波信号幅度变化造成的误差,利用时间-数字芯片实现高精度的时间间隔测量。
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| 关 键 词： | LCR波 应力检测 声弹性理论 时间-数字转换 |
| 文章编号： | 1671-1041（2006）03-0118-03 |
| 收稿时间： | 2006-03-21 |
| 修稿时间： | 2006年3月21日 |
The experimental study of measuring the longitudinal stress in accessory using LCR wave |
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| LIU Fan,DING Jie-xiong.The experimental study of measuring the longitudinal stress in accessory using LCR wave[J].Electronic Instrumentation Customer,2006,13(3):118-120. |
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| Authors: | LIU Fan DING Jie-xiong |
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| Abstract: | A method for measuring the longitudinal stress of accessory is presented in this paper. Based on the acoustoelastic theory, this method can measure the stress from the surface of accessory using Critically Refracted Longitudinal (LCR) wave. According to the relation ship between the ultrasonic propagation characteristic and stress condition, an experimental measurement system based on the travel -time was constructed. The "Zero-Crossing" method was adopted in measuring the travel-time to reduce the errors coused by amplitude change of the ultrasonic signals. The travel-time of LCR wave is measured by Time to Digital Converter (TDC) with high accuracy. |
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| Keywords: | LCR wave Stress measurement Acoustoelastic theory TDC |
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