采用单像素桶探测器的数字全息成像方法

Digital Holographic Imaging with Single Pixel Bucket Detector

针对面阵探测器的靶面尺寸较小、分辨率较低,并且某些波段的面阵探测器难以制作等问题,提出基于单像素桶探测器的数字全息成像方法。该方法采用光寻址空间光调制器(OASLM)作为数字全息与计算幻影成像的中间转换器件,待成像物体的全息图作为写入光直接写入OASLM;用可以动态刷新、携带有参考矩阵编码信息的结构光作为电寻址空间光调制器的读出光读出全息图,并由单像素桶探测器探测其光强;该光强信号与参考矩阵进行关联运算,经由计算幻影成像算法得到重建全息图;再根据数字全息成像再现算法得到待成像物体的再现像。通过原理分析和模拟实验验证了该方法的可行性。

In order to solve the problem that the plane-array detectors have small size of target surface, low resolution and difficult to make in certain wavelengths, a digital holographic imaging method with single pixel bucket detector is proposed. In this scheme, an optically addressed spatial light modulator （OASLM） works as a conversion device between the digital holography system and computational ghost imaging system. The hologram of object to be imaged is used as the writing light and written directly into the OASLM. The written hologram is readout and retrieved by using computational ghost imaging procedure, in which an electrically addressed spatial light modulator is utilized to produce a sequence of updateable, computer-generated, and independent reference matrix. And a single pixel bucket detector is used to collect the intensity of the readout beam. The associated operation of light intensity signal and reference matrix is conducted, the reconstructed hologram is obtained through calculating the phantom imaging algorithm. The reproductive image of the object is obtained using the digital holographic reconstruction algorithm. The feasibility of the proposed method is proved by theory analysis and simulation experiment.