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Sensors 2016, 16(1), 45;

An Electrically Tunable Zoom System Using Liquid Lenses

School of Optoelectronics, Beijing Institute of Technology, Beijing 100081, China
Graduate School at Shenzhen, Department of Precision Instrument, Tsinghua University, Shenzhen 518055, China
These authors contributed equally to this work.
Author to whom correspondence should be addressed.
Academic Editor: Manuela Vieira
Received: 4 November 2015 / Revised: 27 December 2015 / Accepted: 28 December 2015 / Published: 31 December 2015
(This article belongs to the Section Physical Sensors)
Full-Text   |   PDF [2983 KB, uploaded 31 December 2015]   |  


A four-group stabilized zoom system using two liquid lenses and two fixed lens groups is proposed. We describe the design principle, realization, and the testing of a 5.06:1 zoom system. The realized effective focal length (EFL) range is 6.93 mm to 35.06 mm, and the field of view (FOV) range is 8° to 40°. The system can zoom fast when liquid lens 1’s (L1’s) optical power take the value from 0.0087 mm−1 to 0.0192 mm−1 and liquid lens 2’s (L2’s) optical power take the value from 0.0185 mm−1 to −0.01 mm−1. Response time of the realized zoom system was less than 2.5 ms, and the settling time was less than 15 ms.The analysis of elements’ parameters and the measurement of lens performance not only verify the design principle further, but also show the zooming process by the use of two liquid lenses. The system is useful for motion carriers e.g., robot, ground vehicle, and unmanned aerial vehicles considering that it is fast, reliable, and miniature. View Full-Text
Keywords: optical imaging; liquid lens; stabilized zoom system; Gaussian bracket optical imaging; liquid lens; stabilized zoom system; Gaussian bracket

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Li, H.; Cheng, X.; Hao, Q. An Electrically Tunable Zoom System Using Liquid Lenses. Sensors 2016, 16, 45.

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