Elvira Johanna Maria Paulussen,Olaf Thomas Johan Antonie Vermeulen
申请号：
US15557861
公开号：
US20180049657A1
申请日:
2016.02.26
申请国别(地区):
US
年份:
2018
代理人:
摘要：
The invention relates to a photoplethysmography device (20) of the reflectance type, comprising a light source (4), a light sensor (5), and an interface layer (21). The interface layer (21) has a recess between the source (4) and the sensor (5) in order to prevent reflection losses between the device (20) and the skin and to prevent that light from the source (4) can reach the sensor (5) directly via the interface layer (21).
