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1.清华大学 精密仪器系, 北京100084
2.清华大学 精密测试技术及仪器国家重点实验室, 北京 100084
Received:11 May 2021,
Revised:04 June 2021,
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白杨,赵开春,尤政.分焦平面偏振图像传感器偏振主轴方向的标定[J].光学精密工程,
BAI Yang,ZHAO Kai-chun,YOU Zheng.Calibration of polarization axis direction of sub focal plane polarization image sensor[J].Optics and Precision Engineering,
白杨,赵开春,尤政.分焦平面偏振图像传感器偏振主轴方向的标定[J].光学精密工程, DOI:10.37188/OPE..0001
BAI Yang,ZHAO Kai-chun,YOU Zheng.Calibration of polarization axis direction of sub focal plane polarization image sensor[J].Optics and Precision Engineering, DOI:10.37188/OPE..0001
分焦平面偏振图像传感器的偏振主轴方向对后续使用斯托克斯矢量进行偏振参数解算的结果准确性有重要影响,因此需要在使用该类型传感器前进行标定。针对这一需求,提出了一种基于测量分焦平面偏振图像传感器中各偏振主轴方向像素输出平均值所拟合曲线相位差的方法,并对该方法进行了仿真与实际测试。首先,控制照射到传感器表面的线偏振光按照设定步长旋转若干周期,传感器同时拍摄图片。然后,选定图片的感兴趣区域,并对该区域内同偏振主轴方向的像素值求平均,获得各偏振主轴方向像素平均值随旋转角度变化的序列。接着,使用傅里叶级数拟合法对各序列进行拟合,获得像素输出值随旋转角度变化的表达式。最后,选定一个偏振主轴方向为基准方向,其它偏振主轴方向为该方向表达式与基准方向表达式的相位差。实际测试结果表明:标定值与名义值相差不超过0.1°。该方法的标定精度高、可操作性好,能够较好的完成分焦平面偏振图像传感器偏振主轴方向的标定任务。
The polarization axis direction of the sub focal plane polarization image sensor has an important influence on the accuracy of the polarization parameter calculation using Stokes vector, so it is necessary to calibrate the sensor before using it. In order to meet this requirement, a method based on measuring the phase difference of the curve fitted by the average output value of pixels in each polarization axis direction of the sub focal plane polarization image sensor is proposed, and the simulation and actual test are carried out. Firstly, the linearly polarized light irradiating the surface of the sensor is rotated for several cycles according to a setting step size, and the sensor takes pictures at the same time. Then, the region of interest of the image is selected, and the pixel values in the same polarization axis direction in the region are averaged to obtain the sequence of the average values of the pixels in each polarization axis direction changing with the rotation angle. Then, the Fourier series fitting method is used to fit each sequence, and the expression of the pixel output value changing with the rotation angle is obtained. Finally, one polarization axis is selected as the reference direction, and the other polarization axis is the phase difference between the expression of this direction and that of the reference direction. The actual test result shows that the difference between the calibration value and the nominal value is not more than 0.1 °. This method has high calibration accuracy and good operability, and can complete the task of calibrating the polarization axis direction of the sub focal plane polarization image sensor.
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