Mazhar Mohsin A, Russell Conor, Amiri Mohammad, Riza Nabeel A
Appl Opt. 2019 Nov 20;58(33):9154-9162. doi: 10.1364/AO.58.009154.
Proposed and demonstrated is the coded access optical sensor (CAOS) line camera, a one-dimensional or line version of the two-dimensional (2D) digital-micromirror-device (DMD)-based CAOS camera. The proposed line camera design includes a precise dual-axis mirror scanning galvo system incorporating feedback control that eliminates the need for mechanical motion of either the camera or the target. CAOS line scan imaging experiments using a white light source with two test targets are conducted and compared with non-scan 2D CAOS imaging. Specifically, a 2D DMD operated as both a full-frame and a line modulator is used to demonstrate both full-frame (${127} \times {45}$127×45 pixels) and line (127 pixels) scan CAOS imaging. Also demonstrated is an increase in field of view (FOV) of the camera unit using the galvo system with FOV increased by factors of 2.87 and 1.67 in the horizontal and vertical directions, respectively. In addition, proposed for future implementation is a CAOS line camera design that allows analog and hybrid analog-digital time-frequency CAOS-mode irradiance coding for realizing improved inter-pixel cross talk. The CAOS line camera versus a 2D image sensor camera is suited for broad-spectrum large area/FOV imaging applications where high linear dynamic range and low contrast recovery are critical challenges, such as in active illumination inspection of archeological and art works and industrial machine parts.
提出并演示了编码访问光学传感器（CAOS）线相机，它是基于二维（2D）数字微镜器件（DMD）的CAOS相机的一维或线版本。所提出的线相机设计包括一个精确的双轴镜扫描振镜系统，该系统结合了反馈控制，无需相机或目标进行机械运动。使用具有两个测试目标的白光源进行了CAOS线扫描成像实验，并与非扫描2D CAOS成像进行了比较。具体而言，使用既作为全帧调制器又作为线调制器的2D DMD来演示全帧（127×45像素）和线（127像素）扫描CAOS成像。还展示了使用振镜系统的相机单元的视场（FOV）增加，在水平和垂直方向上的FOV分别增加了2.87倍和1.67倍。此外，还提出了一种CAOS线相机设计以供未来实施，该设计允许模拟和混合模拟-数字时频CAOS模式辐照度编码，以实现改进的像素间串扰。CAOS线相机与2D图像传感器相机相比，适用于宽光谱大面积/FOV成像应用，在这些应用中，高线性动态范围和低对比度恢复是关键挑战，例如在考古和艺术品以及工业机器零件的主动照明检测中。
