Dr. Chia-Ming Jan Profile

Dr. Chia-Ming Jan

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Publications (4)

Proceedings Article | 29 April 2016 Paper

Design and verification of the miniature optical system for small object surface profile fast scanning

Sheng Chi, Shu-Sheng Lee, Jen-Yu Huang, Jen, Ti-Yu Lai, Chia-Ming Jan, Po-Chi Hu

Proceedings Volume 9899, 989928 (2016) https://doi.org/10.1117/12.2227534

KEYWORDS: Fringe analysis, Phase shifting, Optical scanning systems, Phase shifts, 3D scanning, Projection systems, Optical design, Digital recording, CMOS cameras, Phase shifting, 3D modeling, Cameras, Image filtering, Light sources

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As the progress of optical technologies, different commercial 3D surface contour scanners are on the market nowadays. Most of them are used for reconstructing the surface profile of mold or mechanical objects which are larger than 50 mm×50 mm× 50 mm, and the scanning system size is about 300 mm×300 mm×100 mm. There are seldom optical systems commercialized for surface profile fast scanning for small object size less than 10 mm×10 mm×10 mm. Therefore, a miniature optical system has been designed and developed in this research work for this purpose. Since the most used scanning method of such system is line scan technology, we have developed pseudo-phase shifting digital projection technology by adopting projecting fringes and phase reconstruction method. A projector was used to project a digital fringe patterns on the object, and the fringes intensity images of the reference plane and of the sample object were recorded by a CMOS camera. The phase difference between the plane and object can be calculated from the fringes images, and the surface profile of the object was reconstructed by using the phase differences. The traditional phase shifting method was accomplished by using PZT actuator or precisely controlled motor to adjust the light source or grating and this is one of the limitations for high speed scanning. Compared with the traditional optical setup, we utilized a micro projector to project the digital fringe patterns on the sample. This diminished the phase shifting processing time and the controlled phase differences between the shifted phases become more precise. Besides, the optical path design based on a portable device scanning system was used to minimize the size and reduce the number of the system components. A screwdriver section about 7mm×5mm×5mm has been scanned and its surface profile was successfully restored. The experimental results showed that the measurement area of our system can be smaller than 10mm×10mm, the precision reached to ±10μm, and the scanning time for each surface of an object was less than 15 seconds. This has proved that our system own the potential to be a fast scanning scanner for small object surface profile scanning.

Proceedings Article | 7 March 2016 Paper

A portable intra-oral scanner based on sinusoidal pattern of fast phase-shifting

Chia-Ming Jan, Ying-Chieh Lin

Proceedings Volume 9770, 97700G (2016) https://doi.org/10.1117/12.2218483

KEYWORDS: Scanners, Phase shifts, CMOS sensors, Laser scanners, Teeth, Data modeling, Modulation, Projection systems, Fringe analysis, Laser dentistry

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Proceedings Article | 21 February 2013 Paper

An integrated platform for biomolecule interaction analysis

Chia-Ming Jan, Pei-I Tsai, Shin-Ting Chou, Shu-Sheng Lee, Chih-Kung Lee

Proceedings Volume 8597, 85970F (2013) https://doi.org/10.1117/12.2002006

KEYWORDS: Modulation, Sensors, Phase shift keying, Ellipsometry, Refractive index, Mirrors, Biological research, Phase measurement, Surface plasmons, Biosensors

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Proceedings Article | 17 February 2010 Paper

The circular polarization interferometer based surface plasmon biosensor

C.-M. Jan, Y.-H. Lee, C.-K. Lee

Proceedings Volume 7577, 75770B (2010) https://doi.org/10.1117/12.842037

KEYWORDS: Polarization, Surface plasmons, Interferometry, Refractive index, Algorithm development, Interferometers, Mirrors, Prisms, Tolerancing, Thin films

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