臺灣博碩士論文加值系統

摘要

　 人工電子眼的研發，可為視障者找回一絲光明，藉由電流刺激視網膜所剩餘的感光細胞，讓因感光細胞壞死而導致失明的患者得以恢復部分視覺。對於無線人工電子眼系統中，電力與訊號無線傳輸之品質為決定該系統穩健度的關鍵因素。本論文研製人工電子眼中電力與訊號無線傳輸元件及分析評估元件電磁輻射對人體之影響。電力傳輸元件設計利用線圈磁耦合原理，而訊號無線傳輸元件設計利用電磁輻射結構。電力無線傳輸元件之操作頻率為2MHz，元件藉由双線圈結構中磁場耦合的方式達到電力傳輸效果，以提供人工電子眼中系統晶片運作。訊號無線傳輸元件之操作頻帶為402~405MHz，元件經由小型化折疊型式偶極天線輻射之電磁波傳輸晶片資訊。元件電磁輻射影響經由人體組織SAR值與溫度評估，以確保元件電磁輻射對人體組織之影響在規範之安全範圍值內。

Abstract

The research and development of retinal prosthesis aims for restoration of sight in patients suffering from degenerative retinal diseases such as Retinitis Pigmentosa and Age-Related Macular Degeneration. In a wireless retinal prosthesis system, the quality of the wireless power and signal transmission appears to be the key to the system robustness. In this thesis, the design and analysis of the power and signal wireless-transmission components are demonstrated. Also, the evaluation of the impact of electromagnetic radiation from the components on a patient’s head is provided. The design concept of the power wireless-transmission component is based on the magnetic coupling, while the design concept of the signal wireless-transmission component exploits the electromagnetic radiating structure. Specifically, the power wireless transmission at 2 MHz is realized using a pair of coils, and the chip signal of the frequencies from 402 to 405 MHz is transmitted through a miniaturized zig-zag dipole. The impact of the electromagnetic radiation on a patient’s head is evaluated through the simulated SAR and temperature rise of the tissues in the head. It is essential to assure that the SAR and temperature rise meet the safety requirements.

目錄
頁次
第一章 序論................................. 1
1.1 前言..................................... 1
1.2 研究動機與目的........................... 2
1.3 論文提要................................. 3
第二章 人工電子眼中無線傳輸元件原理..... ....4
2.1 簡介..................................... 4
2.2 電力無線傳輸元件原理..................... 4
2.2.1 電流磁效應與安培右手定則............... 4
2.2.2 磁通量................................. 5
2.2.3 畢歐沙瓦定律........................... 5
2.2.4 法拉第定律............................. 6
2.3 訊號無線傳輸元件原理..................... 7
2.3.1 偶極天線原理........................... 8
2.3.2 天線饋入構.............................13
第三章 人工電子眼中電力無線傳輸元件研製.....15
3.1 設計工具與方法.......................15
3.2 電力無線傳輸元件設計.................15
3.2.1 單層線圈結構中兩線圈間距對耦合量之影響.......... 16
3.2.2 單層線圈結構中接收端線圈半徑對耦合量之影響...... 19
3.2.3 發送端線圈總圈數對耦合量之影響..........22
3.2.4 接收端線圈總圈數對耦合量之影響..........28
3.2.5 接收端線圈導線半徑和圈與圈距離對耦合量之影響.... 31
3.2.6 介質對耦合量之影響..................... 33
3.3 線圈特性量測............................. 36
3.4 線圈電磁效應對人體之影響................. 38
3.4.1 人體頭部模型 ...........................38
3.4.2 人體對電磁波能量吸收率(SAR)............ 40
3.4.3 電磁波對人體溫度變化影響............... 41
3.4.4 介質中線圈產生的電磁場對人體組織之SAR值與溫度影響..42
3.4.5 線圈設計............................... 49
第四章 人工電子眼中訊號無線傳輸元件研製.......53
4.1 設計工具與方法 53
4.2 訊號無線傳輸元件設計....................55
4.3 天線實體結構............................71
4.4 共平面Zigzag偶極天線訊號間傳送與接收....73
4.5 天線電磁波輻射對人體之影響 .............79
第五章 結論與未來研究方向.....................81
參考文獻..................................... 82
附錄......................................... 85

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