| 利用散斑空一时相关性测散射体的慢运动 |
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| 引用本文： | 彭翔,刘迎,叶声华,马世宁. 利用散斑空一时相关性测散射体的慢运动[J]. 光学学报, 1990, 10(5): 464-469 |
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| 作者姓名： | 彭翔 刘迎 叶声华 马世宁 |
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| 作者单位： | 天津大学精密仪器工程系(彭翔，刘迎，叶声华)，天津大学物理系(马世宁) |
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| 摘 要： | 本文研究了利用远场动态散斑的空-时相关性测量散射体运动速度矢量的理论和实验技术.作者在推导出远场动态散斑空-时相关函数的基础上,提出并建立了一种新的微机辅助检测系统.利用它从实验上证明了在单高斯光照明、散射体平动情况下运场动态散斑的空-时相关性,以及空-时相关的差分与运动速度之间的线性关系.通过测量动态散斑的空-时相关性获取散射体的运动速度矢量.实验结果与理论分析吻合.
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| 关 键 词： | 动态散斑 空-时相关 测速 |
| 收稿时间： | 1989-02-01 |
Motion measurement of a diffuser by using space-time correlation of dynamic speckle in far-field region |
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| PENG XIANG,LIU YING AND YE SHISNGHUA. Motion measurement of a diffuser by using space-time correlation of dynamic speckle in far-field region[J]. Acta Optica Sinica, 1990, 10(5): 464-469 |
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| Authors: | PENG XIANG LIU YING AND YE SHISNGHUA |
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| Abstract: | A technique is investigated which uses a laser to measure two components of the transverse velocity of diffuser.On the basis of the derivation of space-time correlation function on the far-field dynamic speckle, a computer-aided detection system is presented. The correlation properties are approached by using the system. The relationship between vector components of the transverse velocity of a diffuser and differentially spatial-temporalcorrelation function of dynamic speckle is shown to be linear. Hence it is possible to measure the velocity vector of a moving diffuser by evaluating the space-time correlation of dynamic speckle. The experimental resul ta are presented to illustrate the theory. |
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| Keywords: | dynamic speckle space-time correlation velocity measurement. |
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