Prof. Chyan-Chyi Wu Profile

Prof. Chyan-Chyi Wu

Researcher at Tamkang Univ

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Author

Publications (11)

Proceedings Article | 1 January 2025 Paper

Reusable sensor for glucose concentration measurement with enzymatic no-core fiber

Shih-Han Hung, Chen-Ming Tsai, Cheng-Chih Hsu, Cheng-Ling Lee, Chyan-Chyi Wu, Ching-Liang Dai

Proceedings Volume 13487, 1348703 (2025) https://doi.org/10.1117/12.3029268

KEYWORDS: Sensors, Glucose, Calibration, Single mode fibers, Fiber optics sensors, Refractive index

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SPIE Journal Paper | 1 September 2021

Reusable enzymatic cuvette with heterodyne refractometer for in-vitro glucose concentration measurement

Cheng-Chih Hsu, Min-Rui Wu, Shih-Han Hung, Ju-Yi Lee, Chyan-Chyi Wu, Ching-Liang Dai

OE, Vol. 60, Issue 09, 094101, (September 2021) https://doi.org/10.1117/12.10.1117/1.OE.60.9.094101

KEYWORDS: Glucose, Sensors, Heterodyning, Refractive index, In vitro testing, Optical engineering, Chemical reactions, Birefringence, Error analysis, Calibration

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SPIE Journal Paper | 22 September 2015

Effective thermal expansion coefficient measurement of holographic material using total internal reflection heterodyne interferometry

Ching-Tang Meng, Chih-Ching Cheng, Cheng-Chih Hsu, Chyan-Chyi Wu

OE, Vol. 54, Issue 09, 094105, (September 2015) https://doi.org/10.1117/12.10.1117/1.OE.54.9.094105

KEYWORDS: Holographic materials, Diffraction gratings, Thermal effects, Diffraction, Holography, Heterodyning, Interferometry, Temperature metrology, Interferometers, Polarization

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Proceedings Article | 22 June 2013 Paper

Alternative displacement sensor with reflection type holographic grating

Yao-Yuan Ho, Zhi-Ru Lin, Cheng-Chih Hsu, Chyan-Chyi Wu, Ju-Yi Lee

Proceedings Volume 8769, 87693K (2013) https://doi.org/10.1117/12.2018657

KEYWORDS: Sensors, Holography, Diffraction gratings, Heterodyning, Holograms, Interferometers, Prisms, Interferometry, Position sensors, Volume holography

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Proceedings Article | 20 September 2011 Paper

Common-path laser encoder system for nanopositioning

Chyan-Chyi Wu, Cheng-Chih Hsu, Ju-Yi Lee, Chun-Yao Cheng

Proceedings Volume 8105, 81050I (2011) https://doi.org/10.1117/12.892792

KEYWORDS: Computer programming, Laser systems engineering, Interferometers, Environmental sensing, Laser sources, Manufacturing, Laser optics, Beam splitters, Photodetectors, Composites

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Proceedings Article | 2 August 2010 Paper

Optical homodyne common-path grating interferometer with sub-nanometer displacement resolution

Chyan-Chyi Wu, Chun-Yao Cheng, Zi-Yi Yang

Proceedings Volume 7791, 779105 (2010) https://doi.org/10.1117/12.860513

KEYWORDS: Interferometers, Diffraction gratings, Homodyne detection, Diffraction, Actuators, Environmental sensing, Nanotechnology, Sensors, Beam splitters, Interferometry

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Proceedings Article | 17 June 2009 Paper

Compensated laser encoder with symmetric and quasi-common-path heterodyne interferometry

Cheng-Chih Hsu, Ju-Yi Lee, Chyan-Chyi Wu

Proceedings Volume 7389, 73891M (2009) https://doi.org/10.1117/12.827453

KEYWORDS: Computer programming, Heterodyning, Diffraction gratings, Interferometry, Polarization, Error analysis, Interferometers, Laser interferometry, Calibration, Electro optical modeling

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Proceedings Article | 11 August 2008 Paper

Optical heterodyne laser encoder for in-plane nanopositioning

Chyan-Chyi Wu, Cheng-Chih Hsu, Ju-Yi Lee, Cheng-Yang Liu

Proceedings Volume 7063, 70631A (2008) https://doi.org/10.1117/12.793710

KEYWORDS: Computer programming, Heterodyning, Signal detection, Laser optics, Sensors, Interferometry, Beam splitters, Optics manufacturing, Scanning probe microscopy, Diffraction gratings

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Proceedings Article | 13 October 2006 Paper

Heterodyne interferometer for measurement of in-plane displacement with subnanometer resolution

Ju-Yi Lee, Hui-Yi Chen, Cheng-Chih Hsu, Chyan-Chyi Wu

Proceedings Volume 6280, 62800J (2006) https://doi.org/10.1117/12.716145

KEYWORDS: Heterodyning, Interferometers, Phase measurement, Light sources, Optical amplifiers, Sensors, Geometrical optics, Precision measurement, Electrooptic modulators, Amplifiers

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Proceedings Article | 3 November 2003 Paper

Novel planar laser encoder system for two-dimensional positioning with ultrahigh head-to-scale alignment tolerance

Chyan-Chyi Wu, Calvin Chang, Ching-Fen Kao, Gwo-Sheng Peng

Proceedings Volume 5173, 517307 (2003) https://doi.org/10.1117/12.504442

KEYWORDS: Computer programming, Tolerancing, Diffraction gratings, Optical design, Optical alignment, Laser development, Diffraction, Interferometers, Polarization, Lithography

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Laser encoders overcome the fundamental resolution limit of geometrical optical encoders by cleverly converting the diffraction limit to phase coded information so as to facilitate nanometer displacement measurement. As positioning information is coded within the optical wavefront of laser encoders, interferometry principles must be adopted in the design of the laser encoders. This effect has posed a very strong alignment tolerance among various components of the whole laser encoder, which in turn imposes a serious user adaptation bottleneck. Out of all alignment tolerances, the head-to-scale alignment tolerance represents the most important hindrance for wider ap-plications. This paper presents a novel laser planar encoder, which serves as a two-dimensional position detection apparatus for precision machine applications and can provide a measuring resolution less than 1 nm. Improving the IBM laser optical encoder design by taking into consideration manufacturing tolerance of various optical components, an innovative two-dimensional laser encoder with ultra high head-to-scale tolerance is presented. It was identified that this newly proposed laser encoder design could avoid the effect of differences in polarization diffraction efficiencies for the 2-D grating scale used. Optimizing the system performance by cleverly designing the profile of the 2-D grating scale was also detailed. The effect of non-uniform temperature field within the head-to-scale range that can yield a nonzero initial phase so as to decrease the system measurement accuracy was analyzed. In addition, misalignment of the polarizers located in front the photodiodes were identified to be the main cause for imperfect Lissajous circles, which may lower the measuring resolution when traditional arctangent algorithm was adopted for circular polarization interferometers. The resolution of the newly developed laser planar encoder was verified by experiments and was found to agree well with the theoretical predictions.

Proceedings Article | 5 October 1999 Paper

Design verifications of a linear laser encoder with high head-to-scale tolerance

Chyan-Chyi Wu, Yi-Chun Chen, Chih-Kung Lee, Chi-Tang Hsieh, Wen-Jack Wu, Sheyshi Lu

Proceedings Volume 3779, (1999) https://doi.org/10.1117/12.368194

KEYWORDS: Computer programming, Tolerancing, Optical design, Diffraction, Diffraction gratings, Laser development, Interferometers, Mirrors, Optical alignment, Optics manufacturing

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Showing 5 of 11 publications

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