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CMOS Light Field Image Sensor Building Block for Detection of Multicolor LED Blink Sequence From Heterogeneous Locations

机译:CMOS光场图像传感器构建块,用于检测异构位置的多色LED闪烁序列

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A light field image sensor is fabricated on a standard complementary metal-oxide-semiconductor (CMOS) process. The sensor uses two grating layers of various layer-to-layer distances to take advantage of Talbot effect. The horizontal placement of the upper grating relative to the lower one has three types of configurations. By shifting the upper grating to the left or right or aligned position relative to the lower grating, light incident from left, right, and center can be differentiated. Furthermore, color selectivity is analyzed by varying grating slit spacing to favor a particular color's wavelength to reach Talbot depth. We designed photodiodes each having area of 14 x 15 um(2). We used a 180-nm five-metal CMOS process and achieved an angle differentiation accuracy error within 1.8 degrees for the direct incidence on aligned configuration and within 3.6 degrees of the expected angle for the left- and right shifted configurations. In addition, we experimented with applying various wavelengths of light even to sensor structures favoring other wavelengths to analyze their effects. Combining these sensor characteristics, we show that red, green, and blue lights, clustered together at three different locations, can be recognized by a set of light field sensors. The sensor set can differentiate 6 different combinations of 3 different color blink sequences per cluster location, thus totaling 18 types of spatial temporal signals. Moreover, repeated measurements showed good immunity to noise. The standard deviation of the measured results between each repetition was less than 5 mV.
机译:在标准互补金属氧化物 - 半导体(CMOS)工艺上制造了光场图像传感器。该传感器使用各种层叠距离的两个光栅层,以利用Talbot效果。上部光栅相对于下部的水平放置具有三种类型的配置。通过将左侧或右侧或对准位置相对于下光栅转移到左侧或对准位置,可以区分从左,右侧和中心的光。此外,通过改变光栅狭缝间隔来分析颜色选择性,以帮助特定颜色的波长到达Talbot深度。我们设计了光电二极管,每个面积为14 x 15 um(2)。我们使用了180 nm五金CMOS过程,并在1.8度内实现了一个角度分化精度误差,以在对齐配置上的直接入射,在左右移动配置的预期角度的3.6度内。此外,我们还使用甚至有利于其他波长来分析它们的效果的传感器结构来应用各种波长光。结合这些传感器特性,我们显示红色,绿色和蓝色光线,在三个不同的位置聚集在一起,可以通过一组光场传感器识别。传感器集可以为每簇位置的3种不同颜色眨眼序列的6种不同组合区分,因此总共18种空间时间信号。此外,重复测量显示出对噪音的良好免疫力。每次重复之间测量结果的标准偏差小于5mV。

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