非接觸式生理訊號感測器之研製

The Design of a Non-contact Vital-sign Sensor

連奉先(Feng-Hsien Lien)

指導教授 ： 李健榮

國立臺北科技大學/電資學院/電資碩士班/碩士(2013年)

摘要

傳統呼吸心跳監測需使用電極和胸帶等接觸方式進行，長時間監測將造成受試者不舒服或皮膚刺激等問題，監測期間身體移動受限進而影響活動便利性。本論文所提出之非接觸式監測方法，能克服上述問題。非接觸式呼吸心跳感測乃是基於電磁波反射原理，裝置產生射頻訊號向人體發射，再接收由人體反射回來之受胸腔與心搏舒張而產生都普勒相位調變的訊號予以解調。進行相位解調後，計算出呼吸心跳之速率。相較於紅外線或可見光偵測，使用射頻非接觸偵測具有更遠感測距離及更好穿透能力。本論文所實現之感測器架構主要包含四個電路，分別為2.4 GHz射頻感測電路、基頻帶通濾波放大器電路、呼吸心跳感測之嵌入式系統電路以及液晶顯示模組。本論文所實現之非接觸式呼吸心跳監測器，其量測範圍半徑為0.001~1米並具有阻絕二次諧波效應之功能。

關鍵字

注入鎖定 ； 非接觸式呼吸心跳感測

並列摘要

Conventionally, the electrocardiography(ECG) and the cardiopulmonary monitors require the electrodes attached to the human body. This may discomfort the patients during a long period of time in monitoring their cardiopulmonary activities. On the other hand, the patient may be confined to the monitor by the connection from the monitor, and this may bring him great inconvenience. This work has implemented a vital-sign sensor to overcome such a problem by using a non-contact scheme, which is based on the reflection of the electromagnetic wave and the Doppler effect. The sensor transmits an RF signal toward the human body, and consequently receives the reflected wave from the human body. Since the reflected wave will be modulated with its phase (or frequency) by human beings cardiopulmonary movement, the sensor can simply demodulate the reflected wave to transduce the cardiopulmonary activities into electrical signals. The electrical signals can be further processed to diagnose the breathing- and the heartbeat-rate. In this work, the non-contact vital-sign sensor was implemented to operate at a frequency of 2.4 GHz. This sensor can successfully achieve a sensing distance ranging from 0.001 to 1 m.

並列關鍵字

injection locking ； vital-sign sensor

參考文獻

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