PROBLEM TO BE SOLVED: To attain pulse wave measurement in consideration of the influence of gravity on hemoperfusion in the case of making pulse wave measurement by photoelectric conversion.SOLUTION: Fluctuating component signals X fluctuating in amplitude caused by the pulsation of an arterial vessel of a subject, and non-fluctuating component signals Z which are other signal components, are extracted from pulse wave signals obtained by photoelectric conversion type pulse wave measurement. An arithmetic processing circuit 120 determines the propriety of hemoperfusion of the subject from at least one of the fluctuating component signal X and non-fluctuating component signal Z. The arithmetic processing circuit 120 measures the pulse wave or the like of the subject by analyzing the fluctuating component signal X while adjusting the intensity of light irradiating the measured site of the subject and the amplification factor of the fluctuating component signal Z according to the determined result.COPYRIGHT: (C)2012,JPO&INPIT【課題】光電変換による脈波測定を行う場合において、血液灌流に対する重力の影響を考慮して脈波を計測することを可能にする。【解決手段】光電変換方式の脈波測定により得られた脈波信号から被験者の動脈血管の脈動に起因して振幅が変動する変動成分信号Xとその他の信号成分である非変動成分信号Zとを抽出する。演算処理回路120は変動成分信号Xと非変動成分信号Zの少なくとも一方から被験者の血液灌流の良否を判定する。そして、演算処理回路120は、その判定結果に応じて、被験者の測定部位に照射する光の強度または変動成分信号Zの増幅率を調整しつつ、変動成分信号Xを解析して被験者の脈拍等を計測する。【選択図】図3
