Shape Measurements by Using a Liquid Crystal Lens

被引：3

作者：

Kawamura, Marenori ^{[1
]}

Toshima, Kuniki ^{[1
]}

机构：

[1] Akita Univ, Grad Sch Engn & Resource Sci, Akita 0108502, Japan

来源：

MOLECULAR CRYSTALS AND LIQUID CRYSTALS | 2011年 / 542卷

关键词：

Focal length; interference fringe; liquid crystal lens; microscope; three-dimensional measurement; FOCAL LENGTH; MANIPULATION; DEVICE; FOCUS;

D O I：

10.1080/15421406.2011.570575

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We propose a microscope system for continuously taking the magnification images of a three-dimensional object by using a composite lens of a liquid crystal (LC) lens in addition to a relay lens and objective lens. The variable focal length of the composite lens can easily be controlled at the range of 3mm by applying the voltages to both a circularly hole-patterned electrode and external flat electrode of the LC lens without any mechanical movements. The depth properties of the object can be estimated by using a Laplacian-Gaussian filter process of the all focused images.

引用

页码：190 / 195

页数：6

共 12 条

[1] Transient Properties of a Liquid Crystal Optical Device with an Elliptical Intensity Distribution [J].

Kawamura, Marenori ;

Ye, Mao ;

Sato, Susumu .

JAPANESE JOURNAL OF APPLIED PHYSICS, 2008, 47 (08) :6404-6406

[2] Optical particle manipulation using an LC device with eight-divided circularly hole-patterned electrodes [J].

Kawamura, Marenori ;

Ye, Mao ;

Sato, Susumu .

OPTICS EXPRESS, 2008, 16 (14) :10059-10065

[3] LASER MANIPULATION BY USING LIQUID CRYSTAL DEVICES WITH VARIABLE-FOCUSING AND BEAM-STEERING FUNCTIONS [J].

Kawamura, Marenori ;

Onishi, Junji ;

Sato, Susumu .

INTERNATIONAL JOURNAL OF OPTOMECHATRONICS, 2009, 3 (04) :264-276

[4]

Nayar S. K., 1992, Proceedings. 1992 IEEE Computer Society Conference on Computer Vision and Pattern Recognition (Cat. No.92CH3168-2), P302, DOI 10.1109/CVPR.1992.223259

[5] SHAPE FROM FOCUS [J].

NAYAR, SK ;

NAKAGAWA, Y .

IEEE TRANSACTIONS ON PATTERN ANALYSIS AND MACHINE INTELLIGENCE, 1994, 16 (08) :824-831

[6] A LIQUID-CRYSTAL MICROLENS OBTAINED WITH A NON-UNIFORM ELECTRIC-FIELD [J].

NOSE, T ;

SATO, S .

LIQUID CRYSTALS, 1989, 5 (05) :1425-1433

[7] Computer aided measurement and compensation system for focal length of lenses in camera manufacture based on the MTF performance using the line CCD sensor [J].

Pahk, HJ ;

Lee, SW ;

Lee, DS .

INTERNATIONAL JOURNAL OF MACHINE TOOLS & MANUFACTURE, 2000, 40 (10) :1493-1511

[8] LIQUID-CRYSTAL LENS-CELLS WITH VARIABLE FOCAL LENGTH [J].

SATO, S .

JAPANESE JOURNAL OF APPLIED PHYSICS, 1979, 18 (09) :1679-1684

[9] Rational filters for passive depth from defocus [J].

Watanabe, M ;

Nayar, SK .

INTERNATIONAL JOURNAL OF COMPUTER VISION, 1998, 27 (03) :203-225

[10] Liquid crystal anamorphic lens [J].

Ye, M ;

Yokoyama, Y ;

Sato, S .

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS, 2005, 44 (1A) :235-236

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