In this study, we conducted a fundamental study on non-contact simultaneous measurement of electrocardiogram (ECG) and pulse beat (PB) using capacitive in-bed electrode sensors. In the studied system, ECG were measured via clothing by conductive fabric electrodes placed under the upper back and the lower back, respectively. Also, by laying conductive strips under the calf and the heel, two capacitive coupling composed of strip-clothing-body surface were formed, and change in coupling capacitance caused by PB was detected. In this system, however, the signal-to-noise ratio (SNR) of the PB was poor and obtained output was unstable. In the new system, SNR was improved by changing sensor's dimension (strip width). Simultaneous measurement of ECG and PB was conducted for three males in supine position and wearing a commercial cotton sleepwear. As the result, the SNR of PB improved by about 15% on average in the new system.
"},{"@language":"ja","@value":"本研究では，容量型電極センサを用いて，ベッド上で心電図と脈動を非接触同時計測する装置について基礎的な検討を行った。検討システムでは上背部の2ヶ所に敷いた導電布電極により，衣類を介して心電図を計測した。また，腓腹部と踵部の下に導電布を敷くことで，シーツを介して導電布－衣類－体表面からなる容量結合を形成し，脈動による結合容量の変化を検出した。ただし，従来システムでは脈動信号のS/Nが悪く，計測が不安定であった。新システムではセンサ形状の変更（2つのセンサ面積比の変更）によりS/Nの向上を図った。20代の男性3名を対象に市販の寝間着（綿100%）を着てもらい，仰臥位で心電図と脈動の同時計測を行った結果，新システムでは脈動のS/Nが平均で約15%向上した。
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