利用空间复用技术提高散斑相关光杠杆的动态范围
Improving Dynamic Range of Speckle Correlation based Optical Lever by spatial multiplexing
摘要：
基于散斑相关的光学杠杆SC OptLev具有吸引人的特性，适合于感测表面角取向的微小变化。在这项研究中，我们提出并证明了一种空间复用技术，用于提高SC OptLev的动态范围。当表面处于其初始位置时，通过横向移动图像传感器并记录较大散斑图案的不同部分来创建大于图像传感器的面积的合成散斑强度图案。然后，通过计算机程序将获取的图像拼接在一起，形成一个相对较大的合成散斑图案。在校准阶段之后，使用合成散斑强度图案来感测表面角取向的变化。通过记录位于传感器区域内的散斑图案的一部分来实时监测表面。接着，记录的散斑图案与计算机中的合成散斑图案互相关。相关峰的所得移位指示测试下的反射表面的角定向。这种空间复用技术使得能够感测超过图像传感器的物理尺寸所施加的限制的表面的角取向的变化。
英文摘要：
Speckle correlation based optical levers SC OptLev possess attractive characteristics suitable for sensing small changes in the angular orientations of surfaces. In this study, we propose and demonstrate a spatial multiplexing technique for improving the dynamic range of SC OptLev. When the surface is in its initial position, a synthetic speckle intensity pattern, larger than the area of the image sensor is created by transversely shifting the image sensor and recording different sections of a larger speckle pattern. Then, the acquired images are stitched together by a computer program into one relatively large synthetic speckle pattern. Following the calibration stage, the synthetic speckle intensity pattern is used to sense changes in the surfaces angular orientation. The surface is monitored in realtime by recording part of the speckle pattern which lies within the sensor area. Next, the recorded speckle pattern is a cross correlated with the synthetic speckle pattern in the computer. The resulting shift of the correlation peak indicates the angular orientations of the reflective surface under test. This spatial multiplexing technique enables sensing changes in the angular orientation of the surface beyond the limit imposed by the physical size of the image sensor.
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