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1. 发明申请

US20090306487A1 PHOTOPLETHYSMOGRAPHY 有权
标题翻译：光电子学
公开(公告)号：US20090306487A1
公开(公告)日：2009-12-10
申请号：US12296513
申请日：2007-04-11
申请人： John Crowe , Mark Grubb , Barrie Hayes-Gill , Nicolas Miles
发明人： John Crowe , Mark Grubb , Barrie Hayes-Gill , Nicolas Miles
IPC分类号： A61B5/1455
CPC分类号： A61B5/0295 , A61B5/02416 , A61B5/02433 , A61B5/1455 , A61B5/14551 , A61B5/14552 , A61B5/7228 , A61B5/7235
摘要： A photoplethysmograph device includes a light source for illuminating a target object. A modulator drives the light source such that the output intensity varies as a function of a modulation signal at a modulation frequency. A detector receives light from the target object and generates an electrical output as a function of the intensity of received light. A demodulator with a local oscillator receives the detector output and produces a demodulated output,insensitive to any phase difference between the modulation signal and the oscillator, indicative of blood volume as a function of time and/or blood composition. A number of demodulators may be provided to derive signals from multiple light sources of different wavelengths, or from an array of detectors. The plethysmograph may operate in a transmission mode or a reflectance mode. When in a reflectance mode, the device may use the green part of the optical spectrum and may use polarising filters.
摘要翻译：光电体积描记器装置包括用于照射目标物体的光源。调制器驱动光源，使得输出强度作为调制频率处的调制信号的函数而变化。检测器从目标物体接收光并产生作为接收光强度的函数的电输出。具有本地振荡器的解调器接收检测器输出并产生解调输出，对调制信号和振荡器之间的任何相位差不敏感，指示作为时间和/或血液成分的函数的血容量。可以提供多个解调器来导出来自不同波长的多个光源或来自检测器阵列的信号。体积描记器可以在透射模式或反射模式下操作。当处于反射模式时，该装置可以使用光谱的绿色部分并且可以使用偏振滤光器。

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