Light based systems are frequently used in the field of medicine for diagnostic and surgical procedures, medical photography, phototherapy, etc. Phototherapy involves the use of light energy for the treatment of physical or mental illnesses. Illumination parameters such as wavelength and dose of therapy can be varied to have distinct effects on cells and tissues. This has necessitated the need to design a system which is programmable for various parameters related to therapy and can also be used by people at large for biomedical applications. The paper presents the design and implementation of a portable, hand-held and programmable Light Emitting Diode (LED) based phototherapy system using embedded technology. The system is designed around the ARM based TM4C123GH6PM microcontroller processor. The microcontroller has been programmed to allow for selection of various parameters such as frequency, duty cycle, and time of exposure. The matrix keypad interface and liquid crystal display (LCD) offer the ease of human interface. An LED driver circuit has been efficiently designed to modulate the output power of LED. Further, Super Bright LED (SLED) of wavelength 633 nm has been successfully tested and results of optical characterization including spectral and spatial response have been presented in the results section. The designed system successfully achieves the programmable parameters required for dose optimisation required for enhancing the therapeutic effects of a phototherapy system.

中文翻译：

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基于可编程LED的光疗系统设计

基于光的系统通常在医学领域中用于诊断和外科程序，医学摄影，光疗等。光疗涉及将光能用于身体或精神疾病的治疗。可以改变诸如波长和治疗剂量的照明参数，以对细胞和组织产生不同的影响。这就需要设计一种系统，该系统对于与治疗有关的各种参数是可编程的，并且也可以被整个人用于生物医学应用。本文介绍了使用嵌入式技术的基于便携式，可编程的可编程发光二极管（LED）的光疗系统的设计和实现。该系统围绕基于ARM的TM4C123GH6PM微控制器处理器而设计。对微控制器进行了编程，可以选择各种参数，例如频率，占空比和曝光时间。矩阵键盘界面和液晶显示器（LCD）简化了人机界面。LED驱动器电路已被有效地设计为调制LED的输出功率。此外，波长的超亮LED（SLED）633 nm已成功测试，结果部分介绍了包括光谱和空间响应在内的光学表征结果。设计的系统成功实现了增强光疗系统治疗效果所需的剂量优化所需的可编程参数。