Advanced Photonics

The Technologies and Power Plant Application of Concentration Photovoltaics [ 下載 PDF ]

Yen Chang Tzeng

The high concentration photovoltaics is one of the important technology options for the development of new and renewable energy resource in the support of the civilization of our mankind. It may play an important role in the upgrade of the industrial technology development, improving domestic energy structure, ensure energy safety, and environmental protection. This article describes the advantage of the HCPV against the Si PV technology, the development of HCPV modules, the development of solar trackers, the ISFOC 300 kW HCPV power Plant and the field testing site of the 12 kW HCPV system at Ordos, Inner Mongolia. It reports the technology and application from the modules design, testing and manufacturing and the field testing of the HCPV system down to the actual 300 kW power plant development. We anticipate to record an important milestone of the industrialization of HCPV technology in Taiwan during its developing process.

Applications of Laser-Induced Fluorescence to Atmospheric-Pressure Air Plasma [ 下載 PDF ]

Chia-Chiang Chang

The spatial distributions of N, O, and NO densities in an atmospheric-pressure air plasma jet are measured using laser-induced fluorescence (LIF). The three densities show completely different spatial profiles. The gas temperature is also measured using the LIF of NO. These results indicate that the composition of chemical species and the gas temperature strongly depend on the distance from the nozzle. It indicates that the optimum distance between the nozzle and a processing material considerably depends on the process; the optimum distance is determined by the required chemical species and the optimum temperature for the process.

New Generation Silicon Drift Energy Dispersive X Ray Spectrometer [ 下載 PDF ]

Yieng-Chieh Hung, Yu-Hsiu Kuo

A revolution in electron-microscopic micro-analysis is made by silicon drift detector EDS. With the advantage of low noise and high count rates, SDD improve the spatial resolution of analysis. Working at near room temperature, liquid nitrogen is no more necessary. This has significantly improved the efficiency and quality in analysis.

Cell Parameter Measurement of a Twisted Nematic Liquid Crystal Device Using Interferometric Polarimeter [ 下載 PDF ]

Meng-Han Liu, Yao-Teng Tseng, Chih-Jen Yu, Kuei-Chu Hsu, Chien Chou

Improving the display quality of liquid crystal display (LCD) is a very important topic for the rapid-growth LCD industry. The cell parameters, such as contrast ratio, response time, luminance and view angle, play important roles to identify the quality of a display. In this work, we demonstrate an experimental measurement setup to get the physical parameters of liquid crystal cells. Five cell parameters of a twisted nematic liquid crystal device, namely, cell gap, pretilt angle, twisted angle, rubbing angle, and phase retardation, are precisely measured by the proposed amplitude-sensitive heterodyne polarimeter (ASHP), which integrates Yeh and Gu's transfer matrix method with Lien's transfer matrix method simultaneously. This proposed method can characterize the five cell parameters under the arrangement of a single wavelength at normal incidence. This method presents the advantages of not only having a simple setup but also the possibility to simultaneously measure five cell parameters to characterize TN-LCD at high speed.

Optical Coherence Tomography: An Introduction to Current Clinical Applications [ 下載 PDF ]

Jai-Yen Chen

Optical coherence tomography (OCT) is an image capturing method to obtain and process optical signals from within optical scattering media. The resulting images are three-dimensional and with a resolution at micrometer level. In clinical applications, OCT has become a diagnostic standard in ophthalmology, has commercial products available for radiology use, and has been expected to have a great impact on cardiology in the near future.

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Current Development and Dilemma in Diagnosis of Mycobacterium Tuberculosis Infection and the Coping Strategy [ 下載 PDF ]

Chang-Chieh Chen, Hsin-Chih Lai

The diagnosis of Mycobacterium tuberculosis (Mtb) essentially depends on isolating the bacteria from tissue. In addition to sputum smears for acid fast bacilli staining (AFB), definitive diagnosis requires growing the bacteria and confirming that the culture is Mtb with biochemical tests or DNA probe. This can take up to eight weeks. Thus, traditional X-ray radiography, acid fast bacilli staining and culture methods will gradually not cope with the clinical requirements. Rapid detection of Mtb will ensure quick treatment for patients and could dramatically reduce the incidence and consequences of tuberculosis. Another problem encountered is the drug-resistance problems of MDR (multi-drug resistant)/XDR (extended drug-resistant) Mtb. Patients with multidrug-resistant Mtb who are on inadequate therapy or who have persistently positive sputum AFB smear or culture results might remain infectious for a prolonged period of time. Those patients, if not isolated effectively, should be reassessed for transmission as long as they remain infectious. More rapid and accurate drug resistance detection methods should be developed, besides the traditional antibiotics dilution methods. Furthermore, how to improve the efficacy of detection of latent infections from the community population is another important issue. In this article, we will introduce current developments and dilemma in diagnosis of Mtb infection, including active tuberculosis, drug-resistant tuberculosis, extrapulmonary tuberculosis and latent tuberculosis.

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Biomedical Signals Processing Technology: Medical Sensors Integrated in Wearable Fabric [ 下載 PDF ]

Gaung-Hui Gu

Smart clothing is a technology product that combines traditional industry like textile, and high-tech industry as electronics, information technology and material. The smart clothes, different from general living product, is applied on military, medical, sports and entertainment. It provides many kinds of information (parameters), e.g. breath, heart beat, body temp., arm swing, walking posture, GPS systems, calorie, and music services. Smart clothing system consists of smart clothes, control box and cell phone (computer). Smart clothe provides the requested monitor parameters; control box does the circuits operation and transfer information to users or monitor via Bluetooth to achieve proper suggestion, prediction, warning and alarming.

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Development of Programmable Control Interface Technique for High-Voltage Power Module [ 下載 PDF ]

Po-Jui Chen, Chien-Hung Chen, Tai-Shan Liao

Manual manipulation is the most common way to adjust the output voltage for high voltage power supplies. However, the manual manipulation interface can not control the voltage precisely, and is unable to connect with other automatic control systems. In this paper, we present a programmable interface which can implement to high voltage power systems easily. The HV control interface takes the digital potentiometer in place of traditional variable resistor and uses Agilent VEE to develop the computer graphic program. Preventing components from high-voltage breakdown, the HV control interface makes use of digital IO device U2121A and fiber detector/emitter adapters to separate the low-voltage module from the high-voltage circuit. A 10 kV high voltage power module is taken as the example to demonstrate the functions and the hardware structure of the control interface. Experiments verify that the HV control interface can work together with the high voltage system. Moreover, the interface does not bring any noise into the high voltage system since the variation of the output voltage is limit to 100 ppm equal to the primary value of noise.

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The Precision Glass Molding Technique Applied to the Manufacturing of Micro-Optical Components [ 下載 PDF ]

Chien-Yao Huang, Kuo-Cheng Huang, Chao-Hui Kuo, Jyh-Rou Sze, Shih-Feng Tseng, Chang-Pin Chou

The precision glass-molding technique (PGMT) can be applied to mass-production of high quality optical elements. The PGMT has several key processes, such as fabrication of mold, generation of preform, optimum of molding parameters and hard coating. This article presents all the processes of PGMT in planar integrated optical elements of micro-projector system, micro-cylindrical lens array (µ -CLA) of line generator and microfluidics of biochip, respectively.