臺灣博碩士論文加值系統

本論文係以自我注入鎖定雷達原理，研製自振式主動天線雷達感測器量測生命徵象參數。設計一雙埠天線作為選頻器及進行發射、接收與注入鎖定，組成振盪器作為射頻訊號源。該感測器分別採用檢波器及鎖相迴路解調，將解調出的生理訊號再輸入訊號擷取模組進行類比-數位轉換以進行訊號處理，計算獲得手腕脈搏、心跳及呼吸頻率。使用微分器加檢波器解調生理訊號，應用於手腕脈搏、心肺、遠距非接觸式量測，三種情境心跳量測結果與醫療級血氧濃度計比較，心跳誤差比皆小於1.2 %。使用鎖相迴路解調生理訊號，應用於遠距非接觸式量測，心跳量測結果與醫療級血氧濃度計比較，心跳誤差比約為2.4 %。經測試後，本論文之自振式主動天線雷達感測器可準確量測生命徵象參數。

This thesis presents a radar sensor with the self-oscillating active integrated antenna based on the self-injection-locked principle for vital-sign monitoring. The two-port circular patch antenna is designed to be treated as a frequency-selective resonator, and then used to implement a self-oscillating active antenna, which is employed to simultaneously transmit radio-frequency signal and receive back-scattered injection wave from the human chest. In this study, the developed sensors use the amplitude and frequency demodulation techniques to acquire the vital sign signals. The measured vital sign is then sent into the analog-to-digital conversion module to obtain digital signals for further digital signal processing. By applying the fast Fourier transformation, the spectra of the wrist pulse, heartbeat, and respiration can be achieved, and the frequency peaks of the vital signs can be easily identified. The amplitude demodulation technique, namely the envelope detector with a microwave differentiator, is used to demodulate the vital signs of the wrist pulse, heartbeat, and respiration. As compared with the results measured by the finger pulse oximeter, the heartbeat error is less than 1.2 %. The frequency demodulation technique, namely the phase-locked loop, is also used to demodulate vital signs of the remote noncontact measurement. As compared with the results measured by the finger pulse oximeter, the heartbeat error is less than 2.4 %. The results presented in this thesis demonstrate that the vital sign can be accurately measured using the developed radar sensor with the self-oscillating active integrated antenna.

摘要 i
Abstract ii
目錄 iii
第一章 緒論 1
1-1研究動機與目的 1
1-2文獻探討 2
1-3章節說明 5
第二章 自振式主動天線雷達感測器研製 6
2-1自振式主動天線設計與量測 6
2-1-1天線設計與量測 6
2-1-2放大器設計與量測 10
2-2感測器檢波解調技術 18
2-2-1微分器 20
2-2-2運算放大器設計及量測 22
2-3自振式主動天線之感測極限測試 24
2-3-1最遠距離之感測極限測試 25
2-3-2近距離之最小可偵測振動測試 28
2-4生命徵象參數量測 31
第三章 使用鎖相迴路解調之雷達感測器研製 36
3-1可調自振式主動天線設計 36
3-1-1可調天線設計與量測 36
3-1-2放大器設計與量測 38
3-2鎖相迴路設計 43
3-2-1鎖相迴路原理 43
3-2-2鎖相迴路電路 44
3-2-3射頻訊號源量測 45
3-3遠距生命徵象參數量測 47
第四章 結論 51
參考文獻 52

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