| Summary: | 碩士 === 國立清華大學 === 動力機械工程學系 === 100 === ABSTRACT
With the fast advancement in technology and progress in optoelectronics industry, various optical products, such as digital cameras, cellphones and micro projectors, are following the trends of compactness and miniaturization. For the purposes of volume and weight reduction without sacrificing image qualities, liquid lens technology has been developed for achieving the important variable focus function. To further perfecting the liquid lens technology and expediting the commercial applications, new metrological technology for fast, simple and low cost inspection has become the most critical development in the industry.
In the traditional non-contact metrological technology, measurement platform based upon interferometry is commonly adopted. However, the system needs more precision optical components for maintaining the measurement quality so that bulky and less cost effective instruments are necessary. Furthermore, interferometer is very sensitive to vibrations and air turbulences in environment. Therefore, the free form interfaces in liquid lens has been measured with the help of Shack-Hartmann wavefront sensors in this thesis. Since the wavefront has been measured via the positional difference of focal point of Shack-Hartmann sensors, less precision and complicated optical components have been necessary for high accuracy in the measurements. In the restoration of wavefront data, Zernike Polyminomials have been adopted for calculation of the phase of light in terms of aberration coefficients. The optical characteristics of the liquid lens under test have been obtained for comparisons between the simulation results from optics analysis and experimental data.
Keywords: Free Surface, Liquid Lens, Shack-Hartmann Sensors
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