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Related Experiment Videos

Three dimensional measurement with an electrically tunable focused plenoptic camera.

Yu Lei1, Qing Tong1, Zhaowei Xin1

  • 1National Key Laboratory of Science and Technology on Multispectral Information Processing, Huazhong University of Science and Technology, Wuhan 430074, China.

The Review of Scientific Instruments
|April 5, 2017
PubMed
Summary
This summary is machine-generated.

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A novel liquid crystal microlens array (LCMLA) allows electrical tuning of focal length. This technology enables a focused plenoptic camera prototype for capturing 3D depth and motion information.

Area of Science:

  • Optics and Photonics
  • Materials Science
  • Microfabrication

Background:

  • Liquid crystal microlens arrays (LCMLAs) offer tunable optical properties.
  • Microhole pattern electrodes are crucial for precise LCMLA control.
  • Nematic liquid crystals are widely used for their electro-optic effects.

Purpose of the Study:

  • To develop and characterize a liquid crystal microlens array (LCMLA) with an arrayed microhole pattern electrode.
  • To integrate the LCMLA into a focused plenoptic camera (LCFPC) prototype.
  • To demonstrate the electrical tunability of the LCMLA and its application in 3D imaging.

Main Methods:

  • Fabrication of the LCMLA using UV-photolithography and wet etching.
  • Electrical characterization of the LCMLA's focusing performance by applying varying voltage signals.

Related Experiment Videos

  • Integration of the LCMLA with a main lens and imaging sensor to form an LCFPC.
  • Experimental acquisition of static and dynamic 3D object information.

    • Main Results:

    • The focal length of the LCMLA is easily tunable by adjusting the root mean square voltage.
    • The LCFPC prototype demonstrates electrically shiftable focusing range along the optical axis.
    • Key parameters for 3D depth, positioning, and motion expression were acquired.
    • Detailed analysis of depth resolution was performed.

    Conclusions:

    • The developed LCMLA provides a simple and effective method for electrical focal length tuning.
    • The LCMLA-based focused plenoptic camera (LCFPC) is a viable platform for 3D imaging applications.
    • The technology enables the acquisition of static and dynamic 3D information with adjustable depth resolution.