- 學位論文
建構可攜式低功耗藍牙足壓裝置
Development of a portable Bluetooth Low Energy device for plantar pressure measurement
摘要
足底壓力可以提供一個有用的工具用來評估病人的行走狀態。雖然近幾年來，在移動醫療設備的廣泛發展下，可攜式的裝置漸漸融入生活，但至目前為止，一般足壓量測裝置仍採用個數眾多的傳感器以及有線的裝置進行量測，因而造成資料量太大且不舒適的問題有待解決。 本研究建構一無線的足壓量測系統以5個壓力傳感器量測在不同階段的行走狀態，以取得週期性的足底壓力訊號。此足壓量測裝置採用低功號藍牙傳輸的整合性晶片(CC2650)為核心，進行數位訊號採集與資料傳輸，進而減少在電池電量上的消耗。另一方面，本研究以智慧型手機作為接收訊號端，接收來自雙腳的壓力數據，並進行壓力特徵值的抓取及顯示壓力訊號，最後計算出步數、步頻、平均壓力以及最大壓力。 本研究之裝置測試分成前、中、後三期，前期驗證足壓訊號是否能正確的量測、傳輸與讀解；同時測試本研究提議的預處理是否正確。中期則測試無任何足部患疾的受測者在不同的行走速度下的壓力訊號。後期為每一次實驗中測試不同足疾患者。測試結果顯示除了證明本研究的系統可以成功紀錄到足壓訊號外，也證明本系統可以量測到足疾患者的行走會影響到訊號大小。 在MATLAB演算法驗證部分利用所擷取實際訊號進行步態特徵判斷與準確率計算，並同時以專家與影片比較本研究之演算法準確度。結果顯示本研究演算法能夠正確判斷出特徵且準確度達96.46%。 本研究成功開發以壓力感測器建構可攜式低功耗藍牙足壓系統，利用少量的壓力感測器成功的量測步態週期，並且實際應用在受試者足底量測，最後搭配Android智慧型手機傳輸、接收與紀錄。最後成功計算出步數、步頻、平均壓力以及最大壓力。
並列摘要
Plantar pressure can provide doctor a useful tool to evaluate patient’s walking status. Although portable device have gradually accepted in everyday living due to the development of the mobile medical devices in the recent years, but until now, most foot pressure measurement devices still use a large number of sensors and wired devices for measurement, resulting in issues such as too much data and uncomfortable yet to be solved. In this study, a wireless foot pressure measurement system was developed that integrated five pressure sensors to measure the walking status at different phase of gait to obtain the periodic plantar pressure signals. This device uses the integrated chip (CC2650) with Low Power Bluetooth to acquire digitalized signal then to transmit the data, thereby reducing the consumption of battery power. On the other hand, this study uses a smart phone to receive pressure data from both foot obtain pressure features and to display pressure signals. Finally, the step, step cadence, mean pressure, and the max pressure are calculated. The validation was divided into three stages in this study: the first, middle, and final stages. In the first stage, whether the foot pressure signal could be correctly measured, transmitted, and read was verified. At the same time, whether the preprocessing functions correctly in this study. In the middle stage, we tested the foot pressure of people who did not have any foot disease at different walking speeds. In the final stage, different foot patients were tested in each experiment. The results of validation indicate that the proposed system can record plantar pressure and prove that the system can obtain the signal amplitude change in patient with foot disease. In the area of MATLAB algorithm verification, using the acquired real signal, the obtained gait features are compared with the experts. The results show that our algorithm can correctly determine the features and the accuracy can reach 96.46 %. In conclusion, this study accomplishes a portable Bluetooth Low Power foot pressure system using five pressure sensors. The device successfully measured the gait cycle using a small number of pressure sensors and it was applied to subjects for plantar pressures measurement. Finally, using Android smartphones to transmit, receive and record signals and successfully calculated the steps, step cadence, mean pressure, and the max pressure.
參考文獻
延伸閱讀
- 黃柏燁（2016）。基於低功耗藍牙之群組證明〔碩士論文，中原大學〕。華藝線上圖書館。https://doi.org/10.6840/cycu201600812
- 陳政霖（2020）。實作封包轉換器用於藍牙網狀網路與長距離低功耗之封包轉換〔碩士論文，健行科技大學〕。華藝線上圖書館。https://www.airitilibrary.com/Article/Detail?DocID=U0022-2607202016534800
- 魏溥辰、黃奕展、林慶達（2004）。透過Bluetooth Specification 1. 2實現多功能藍牙遙控器。電腦與通訊，(107)，23-37。https://doi.org/10.29917/CCLTJ.200403.0004
- 羅旭峰（2020）。Development of Portable Breath Measurement Device Based on LabVIEW Program〔碩士論文，國立臺灣師範大學〕。華藝線上圖書館。https://doi.org/10.6345/NTNU202000587
- 林敬致（2006）。Portable device for wireless biochemical measurement〔碩士論文，國立臺灣大學〕。華藝線上圖書館。https://doi.org/10.6342/NTU.2006.01463