• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>Annual Symposium on Quantitative Nondestructive Evaluation; 19980719-24; Snowbird,UT(US) >CALIBRATION TECHNIQUES FOR ELECTRONIC-BASED SYSTEMS USED IN MEASUREMENT OF NONLINEARITY PARAMETERS
【24h】

CALIBRATION TECHNIQUES FOR ELECTRONIC-BASED SYSTEMS USED IN MEASUREMENT OF NONLINEARITY PARAMETERS

机译：用于测量非线性参数的基于电子的系统的校准技术

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Two measurement techniques to determine the nonlinearity parameter were presented and tested with capacitive detectors using a measurement system with stabilized and calibrated amplifiers. The first method discussed, the Linearity and Offset Adjustment Technique began with consideration of the of the acoustic fundamental and second harmonic signal amplitudes from measurements with amplifiers that were calibrated with a substitutional technique. By using results from a quadratic fit of the A_2 vs. A_1 data, we determine offsets to the data, which when used to correct the amplitude values, resulted in more accurate values of β. The necessity of correction at low amplitudes was found to be especially important since the effects of noise on β are most prevalent at the lower amplitudes. A second measurement method, the Reference Based Measurement Technique was also presented. The results clearly shows that measurements of the nonlinearity parameter may be made without elaborate calibration procedures. In this technique a set of band-pass linear amplifiers is stabilized by a constant temperature environment and constant line voltage. The good agreement between the measurements using this technique and the LOAT strongly suggests the viability of the RBMT as an alternative method of measuring acoustic nonlinearity parameters in solids.
机译：提出了两种确定非线性参数的测量技术，并使用了带有稳定和校准放大器的测量系统，并通过电容检测器对其进行了测试。讨论的第一种方法，线性度和偏移量调整技术，首先考虑了用替代技术校准的放大器的测量所产生的声学基波和二次谐波信号幅度的幅值。通过使用A_2与A_1数据的二次拟合得到的结果，我们确定了数据的偏移量，当用于校正振幅值时，可以得出更准确的β值。人们发现，在低振幅下进行校正的必要性尤其重要，因为噪声对β的影响在较低振幅下最为普遍。还介绍了第二种测量方法，即基于参考的测量技术。结果清楚地表明，无需复杂的校准程序即可进行非线性参数的测量。在这种技术中，一组带通线性放大器通过恒定的温度环境和恒定的线电压来稳定。使用此技术和LOAT进行的测量之间的良好一致性强烈表明RBMT的可行性，它是测量固体中声学非线性参数的替代方法。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号