Time-of-flight imaging based on resonant photoelastic modulation
Time-of-flight imaging based on resonant photoelastic modulation
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DOI：
10.1364/ao.58.002235
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发表时间：
2019-03-20
期刊：
影响因子：
1.9
通讯作者：
Arbabian, Amin
中科院分区：
文献类型：
--
作者：
Atalar, Okan;Van Laer, Raphael;Arbabian, Amin
提出了一种飞行时间成像系统，并阐述了其工作原理。为了实现这一系统，我们设计并制作了一种新的器件--自由空间光混频器。用兆赫级调幅光源照亮（闪光）场景，并由接收器收集来自场景的反射光。接收器由自由空间光混频器组成，包括夹在偏振器之间的光弹性调制器，放置在标准互补金属氧化物半导体（CMOS）图像传感器的前面。该自由空间光混频器将兆赫级幅度调制频率下变频到图像传感器的时间带宽。演示系统的全面扩展将能够测量拍频的相位和多普勒频移，并使用信号处理技术来高精度地估计照明场景中每个点的距离和速度。(C)2019美国光学学会
A time-of-flight imaging system is proposed and its working principle demonstrated. To realize this system, a new device, a free-space optical mixer, is designed and fabricated. A scene is illuminated (flashed) with a megahertz-level amplitude-modulated light source, and the reflected light from the scene is collected by a receiver. The receiver consists of the free-space optical mixer, comprising a photoelastic modulator sandwiched between polarizers, placed in front of a standard complementary metal-oxide-semiconductor (CMOS) image sensor. This free-space optical mixer downconverts the megahertz-level amplitude modulation frequencies into the temporal bandwidth of the image sensor. A full-scale extension of the demonstrated system will be able to measure phases and Doppler shifts for the beat tones and use signal processing techniques to estimate the distance and velocity of each point in the illuminated scene with high accuracy. (C) 2019 Optical Society of America