PROBLEM TO BE SOLVED: To provide a pulse wave sensor capable of highly accurately measuring pulse waves by reducing influence of noise components (called motion noise, hereinafter) due to the movement and vibrations of a subject.SOLUTION: The pulse wave sensor 1 includes: a first light sensor 10 provided with a first light emitting portion 11 to emit light of a first emission intensity P1 to a living body 2, and a first light receiving portion 12 to receive returning light which is emitted from the first light emitting portion 11 and then transmitted through the living body 2 and to generate a first light receiving signal S1 a second light sensor 20 provided with a second light emitting portion 21 to emit light of a second emission intensity P2 weaker than the first emission intensity P1 to the living body 2, and a second light receiving portion 22 to receive returning light which is emitted from the second light emitting portion 21 and then transmitted through the living body 2 and to generate a second light receiving signal S2 and an arithmetic circuit 30 to acquire pulse wave data by subtracting the second light receiving signal S2 from the first light receiving signal S2.COPYRIGHT: (C)2012,JPO&INPIT【課題】被験者の動きや振動に起因するノイズ成分(以下では、モーションノイズと呼ぶ)の影響を低減して高精度に脈波の測定を行うことが可能な脈波センサを提供すること。【解決手段】係る脈波センサ1は、第1発光強度P1の光を生体2に出射する第1発光部11と、第1発光部11から出射された後に生体2内を透過して戻ってくる光を受けて第1受光信号S1を生成する第1受光部12と、を備えた第1光センサ10と;第1発光強度P1よりも弱い第2発光強度P2の光を生体2に照射する第2発光部21と、第2発光部21から出射された後に生体2内を透過して戻ってくる光を受けて第2受光信号S2を生成する第2受光部22と、を備えた第2光センサ20と;第1受光信号S1から第2受光信号S2を差し引くことにより脈波データを取得する演算回路30と;を有する。【選択図】図3
