Shirakawa Yuya, Yasutomi Keita, Kagawa Keiichiro, Aoyama Satoshi, Kawahito Shoji
Graduate School of Medical Photonics, Shizuoka University, Hamamatsu 432-8011, Japan.
Research Institute of Electronics, Shizuoka University, Hamamatsu 432-8011, Japan.
Sensors (Basel). 2020 Feb 14;20(4):1040. doi: 10.3390/s20041040.
An 8-tap CMOS lock-in pixel image sensor that has seven carrier-capturing and a draining time window was developed for short-pulse time-of-flight (TOF) measurements. The proposed pixel for the short-pulse TOF measurements has seven consecutive time-gating windows, each of which has the width of 6 ns, which is advantageous for high-resolution range imaging, particularly for relatively longer distances (>5 m) and under high ambient light operations. In order to enhance the depth resolution, a technique for the depth-adaptive time-gating-number assignment (DATA) for the short-pulse TOF measurement is proposed. A prototype of the 8-tap CMOS lock-in pixel image sensor is implemented with a 1POLY 4METAL 0.11-μm CIS process. The maximum non-linearity error of 1.56%FS for the range of 1-6.4 m and the depth resolution of 6.4 mm was obtained at 6.2 m using the DATA technique.
为短脉冲飞行时间（TOF）测量开发了一种具有八个抽头的CMOS锁定像素图像传感器，该传感器有七个载流子捕获和一个耗尽时间窗口。所提出的用于短脉冲TOF测量的像素有七个连续的时间选通窗口，每个窗口宽度为6 ns，这有利于高分辨率距离成像，特别是对于相对较长的距离（>5 m）以及在高环境光操作下。为了提高深度分辨率，提出了一种用于短脉冲TOF测量的深度自适应时间选通数分配（DATA）技术。采用1POLY 4METAL 0.11-μm CIS工艺实现了8抽头CMOS锁定像素图像传感器的原型。使用DATA技术在6.2 m处获得了1 - 6.4 m范围内1.56%FS的最大非线性误差和6.4 mm的深度分辨率。
