Characteristic Analysis and Application of Far Infrared Emission Diode

• Main Authors: Pei-Yun Yang, 楊珮昀
• Other Authors: 陳文瑞
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/5dvgs4

碩士 === 國立虎尾科技大學 === 電子工程系碩士班 === 106 === In this paper, the LED grains are used as heat sources to design a thermal emission diode emitting far infrared rays. The operation electricity and far infrared temperature characteristics were studied. In the final, the thermal emission diode was applied to a seven-digital display with visible and thermal view, and also used to develop a far-infrared vacuum cupping device. The structure of this paper is shown that the first chapter introduces the concept of motivation and basic, the second chapter introduces the theory of surface temperature and related to the application of measurement equipment, the third chapter introduces the overall packaging process and related application circuit design, the fourth chapter is a complete experimental results and discussions, and the fifth chapter is the conclusion. In order to use as a display, the temperature of a thermal emission diode must be maintained at a high and a low temperature level. So the pulse width modulation (PWM) method and the thermoelectric cooler (TEC) are used to optimize the design. In the reliability study, the junction temperature is a key factor. When the temperature of the thermal emission diode is lower than that of the 0.08A~0.2A, the limit of the operating voltage is an important figure-of-merit to design the circuit, and the limit of the corresponding far infrared radiation temperature is found. The Vf (min) of the TED is about 1.8V which is the minimum boundary requiring to have a safe operation. In addition, when the operating current is greater than 0.2A, the thermal emission diodes are prone to burn. Finally, the thermal emission diodes were used in the seven-digital display, so that the visible light and the far infrared radiation can be displayed at the same time. The counter number could be varied from zero to nine as people seen, and the counter number could be varied from nine to zero with the far Infrared Thermal Imager Recorder. In addition, in the far infrared vacuum cupping application, the temperature of the thermal emission diode can be heated up to 40~50oC. The blood circulation with the far infrared assistance was expected to improve the effect during the cupping treatment.