Speeded-Up Focus Control of Electrically Tunable Lens by Sparse Optimization
Speeded-Up Focus Control of Electrically Tunable Lens by Sparse Optimization
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DOI：
10.1038/s41598-019-48900-z
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发表时间：
2019-08-26
影响因子：
4.6
通讯作者：
Sato, Kosuke
中科院分区：
文献类型：
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作者：
Iwai, Daisuke;Izawa, Hidetoshi;Sato, Kosuke
电透镜（ETL），也称为液态透镜，可以通过更改在镜头上施加的电信号来聚焦在各个距离上。 ETL不需要机械结构，因此，与传统的计算机翻译阶段相比，ETL提供了更紧凑，更便宜的焦点控制。在过去几年中，它们在广泛的成像和显示系统中被利用，并启用了新颖的应用。然而，致动后ETL中的光流体被涟漪，从物理上限制了响应时间并显着缩小了适用性范围。为了减轻此问题，我们应用了一个稀疏的优化框架，该框架优化了对ETL的电信号输入的时间模式。在验证实验中，提出的方法加速了焦距与目标模式的收敛性。特别是，它以简单确定的输入信号的速度的两倍，将光功率收敛到目标，并提高了多核成像过程中捕获图像的质量。
Electrically tunable lenses (ETL), also known as liquid lenses, can be focused at various distances by changing the electric signal applied on the lens. ETLs require no mechanical structures, and therefore, provide a more compact and inexpensive focus control than conventional computerized translation stages. They have been exploited in a wide range of imaging and display systems and enabled novel applications for the last several years. However, the optical fluid in the ETL is rippled after the actuation, which physically limits the response time and significantly hampers the applicability range. To alleviate this problem, we apply a sparse optimization framework that optimizes the temporal pattern of the electrical signal input to the ETL. In verification experiments, the proposed method accelerated the convergence of the focal length to the target patterns. In particular, it converged the optical power to the target at twice the speed of the simply determined input signal, and increased the quality of the captured image during multi-focal imaging.