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首页> 外文期刊>Applied optics >METHODS FOR THE DECONVOLUTION OF DEFOCUSED-IMAGE PAIRS RECORDED SEPARATELY ON TWO CCD CAMERAS - APPLICATION TO PARTICLE SIZING
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METHODS FOR THE DECONVOLUTION OF DEFOCUSED-IMAGE PAIRS RECORDED SEPARATELY ON TWO CCD CAMERAS - APPLICATION TO PARTICLE SIZING

机译：对分别记录在两个CCD摄像机上的去焦图像对进行去卷积的方法-应用于粒子大小

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摘要

An optoelectronic in-line imaging system for particle sizing is described. The images are scanned by two CCD cameras viewing the same object field that is illuminated with two pulses. One of the cameras is double exposed and the other is activated only during the second pulse. Two successive analogical subtractions between the video output signals gives the sign of the transverse velocity vector. Out-of-focus images are deconvolved with the assumption of a Gaussian point-spread function (PSF) whose spatial parameter a increases with the defocusing distance z. In the case of low particle density, an algorithm based on the exploitation of the power spectral density is used to estimate the particle diameter. This method can be applied to the case of fast-moving particles (e.g., v < 500 m/s). The accuracy of the size measurement is better than 10% in the diameter range 20-160 mu m. The main result is that this accuracy is obtained with an amount of defocusing in the range [-2, 2] mm. Thus, the depth of field is significantly extended in comparison with a conventional microscopic imaging system. (C) 1996 Optical Society of America [References: 19]
机译：描述了一种用于颗粒尺寸调整的光电在线成像系统。图像由两台CCD摄像机扫描，观察同一物体场，该物体场被两个脉冲照亮。其中一个摄像机是双重曝光的，另一个摄像机仅在第二个脉冲期间被激活。视频输出信号之间的两个连续的类比减法给出了横向速度矢量的符号。使用高斯点扩展函数（PSF）的假设对散焦图像进行反卷积，其空间参数a随着散焦距离z的增加而增加。在低颗粒密度的情况下，使用基于利用功率谱密度的算法来估计颗粒直径。该方法可以应用于快速移动的粒子（例如，v <500 m / s）的情况。在20-160微米的直径范围内，尺寸测量的精度优于10％。主要结果是通过在[-2，2] mm范围内的散焦量可以获得此精度。因此，与传统的显微成像系统相比，景深大大扩展了。 （C）1996年美国眼镜学会[参考文献：19]

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