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首页> 外文期刊>Optics Letters >Bit-efficient, sub-millisecond wavefront measurement using a lock-in camera for time-reversal based optical focusing inside scattering media
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Bit-efficient, sub-millisecond wavefront measurement using a lock-in camera for time-reversal based optical focusing inside scattering media

机译：使用锁定摄像头的位有效亚毫秒波前测量，用于散射介质内部基于时间反转的光学聚焦

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Time-reversed ultrasonically encoded optical focusing measures the wavefront of ultrasonically tagged light, and then phase conjugates the tagged light back to the ultrasonic focus, thus focusing light deep inside the scattering media. In previous works, the speed of wavefront measurement was limited by the low frame rates of conventional cameras. In addition, these cameras usedmost of their bits to represent an informationless background when the signal-to-background ratio was low, resulting in extremely low efficiencies in the use of bits. Here, using a lock-in camera, we increase the bit efficiency and reduce the data transfer load by digitizing only the signal after rejecting the background. With this camera, we obtained the wavefront of ultrasonically tagged light after a single frame of measurement taken within 0.3 ms, and focused light in between two diffusers. The phase sensitivity has reached 0.51 rad even when the SBR is 6 x 10(-4). (C) 2016 Optical Society of America
机译：时间反向超声编码的光学聚焦测量超声标记的光的波前，然后将标记的光相位共轭回到超声聚焦，从而将光聚焦在散射介质内部。在以前的工作中，波阵面测量的速度受到传统摄像机低帧速率的限制。另外，当信噪比低时，这些相机的大部分位都使用无信息背景来表示，导致位的使用效率极低。在这里，使用锁定相机，通过在拒绝背景后仅对信号进行数字化处理，可以提高位效率并减少数据传输负载。使用此相机，我们在0.3 ms内进行单帧测量后获得了超声标记的光的波前，并将光聚焦在两个扩散器之间。即使SBR为6 x 10（-4），相位灵敏度也达到0.51 rad。 （C）2016美国眼镜学会

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