Sources of measurement error in laser Doppler vibrometers and proposal for unified specifications
Sources of measurement error in laser Doppler vibrometers and proposal for unified specifications
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激光多普勒测振仪测量误差来源及统一规范建议
DOI：
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发表时间：
2008
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影响因子：
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通讯作者：
G. Siegmund
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文献类型：
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作者：
G. Siegmund
本文的重点是揭示激光多普勒测振仪(LDV)的测量误差来源，并提出适合描述其对测量不确定度影响的指标。由于测量条件不理想或技术实现不完善，LDV的光学和电子学部分都可能造成测量误差。虽然光学部分的贡献在大多数情况下可以忽略，但后续的信号处理链可能会导致显著的误差。由干涉仪的非理想行为引起的测量误差主要是在极低的振动幅度下观察到的，并且取决于光学布置。本文组织如下：从光电探测器开始，分析电子信号处理块对测量不确定度的贡献。建议了一套规范，采用了传统振动测量设备中已知的词汇和定义。最后介绍了一种适用于使用标准电子测量设备测定大多数规格的测量装置。
The focus of this paper is to disclose sources of measurement error in laser Doppler vibrometers (LDV) and to suggest specifications, suitable to describe their impact on measurement uncertainty. Measurement errors may be caused by both the optics and electronics sections of an LDV, caused by non-ideal measurement conditions or imperfect technical realisation. While the contribution of the optics part can be neglected in most cases, the subsequent signal processing chain may cause significant errors. Measurement error due to non-ideal behaviour of the interferometer has been observed mainly at very low vibration amplitudes and depending on the optical arrangement. The paper is organized as follows: Electronic signal processing blocks, beginning with the photo detector, are analyzed with respect to their contribution to measurement uncertainty. A set of specifications is suggested, adopting vocabulary and definitions known from traditional vibration measurement equipment. Finally a measurement setup is introduced, suitable for determination of most specifications utilizing standard electronic measurement equipment.