以RFID 技術為基礎之可攜式眼睛保健無線紀錄裝置

Abstract

本論文介紹可靠、容易攜帶、且具備自動化調整的眼壓UHF RFID訊號接受器與應用程式 (IOP RFID Receiver and Application) 的研究與開發過程， 為了讀取眼壓訊號，我們使用以隱形眼鏡為基礎的裝置 (IOP Tag)，當病患戴著此隱形眼鏡裝置的時，可以藉由UHF RFID進行量測讀值，並回傳眼壓數值返回接受器。在本論文前，該裝置的接受器為CISC RFID Xplorer，因CISC RFID Xplorer接收體積龐大以及需要手動調整多項量測參數（例如：Baseline, Sensitivity 等），量測往往費時且非常不易攜帶。本論文為了解決此問題，開發了專屬IOP量測監控的手持式裝置(IOP RFID Receiver and Application)。開發主要為：RFID Receiver 韌體端與 IOP Android Application 手機軟體開發，RFID Receiver 藉由修改原先 AMS AS3993 提供的官方韌體 (FW Source 1.3.8)，定義並實現新的Protocol ID，使其支援IOP Tag 客製化的Commands；IOP Android Application 則為一支援 USB HID Protocol 的手機端應用程式，運行在支援 USB OTG 的 Android Smartphon裝置上，開發過程採用 Android Studio撰寫與RFID Receiver 溝通的HID Command，使得IOP Tag 讀值可以直接在手機上進行，由手機本身提供足夠的電力，不需要任何的外部供電，同時，為了讓使用更方便，原先在Xplorer 上面的量測必須要手動調整Baseline 和 Sensitivity 使得 IOP Tag 中的 C2D 落在可讀取範圍內（介於0 到飽和值），透過本論文設計的IOP Applcation，程式會執行自動Segment Adjustment 演算法，選取最適當的Baseline 與 Sensitivity，全部調整的過程自動化，節省量測者的時間，同時增加使用的方便性，最後，由於IOP Receiver 的供電來源為手機本身，節省電源是一個重要的工作，本IOP Application 亦自動偵測並且調整最小Power Gain，用最小的Power 使得IOP Tag 運作且回傳資料。

The thesis introduces our work on designing and implementation of a new UHF RFID Receiver for IOP Tag. The new receiver is portable, reliable and with auto adjustment feature. In order to read the intraocular pressure, or IOP from the eyes. We use a contact-lens-based device with sensor and chip built-in. As user wears the device, the receiver is able to read the intraocular pressure value and transfer the readout value back via UHF RFID transmission. Before the thesis, the measurement was conducted with CISC RFID Xplorer machine. The CISC Xplorer is a huge and not portable. Moreover, several initial adjustments (like baseline and sensitivity) are required every time before conducting a measurement. The thesis is about solving this problem by designing and implementing a new IOP RFID Receiver and Application. Mainly two parts, firmware on receiver and software application running on Android smartphone. Based on AMS AS3993 official firmware (FW Source 1.3.8), we define and implement a new protocol ID to supports IOP-customized commands. For the application software, we write a new Android application with USB OTG support. And execute an application on an Android smartphone. The communication between receiver and smartphone is based on USB HID protocol. By taking advantage of the protocol, the new IOP receiver is totally powered by smartphone USB socket. That requires no external power. Then, to make the receiver more friendly and easy to use, we also program auto segment adjustment algorithm. Previously, manual adjustment for baseline and sensitivity is time consuming. With the auto segment adjustment algorithm developed, a best fit baseline and sensitivity can be selected automatically without human involved. This not only saves user’s time, but also enhance its convenience. Last but not the least, since power for IOP receiver was taken from smartphone directly. Power saving is an important issue in order to provide longer durability. The new application also detects and adjusts a minimum power gain to boot IOP Tag. Thus, the receiver is able to work under highest energy efficiency.