Self-Mixing Interferometric Sensor Displacement Reference for PPG Motion Artifact Handling
Year: 2010
Type: conference-paper
Abstract: By illuminating the skin, a photoplethysmograph can measurea patients heart rate and blood oxygenation. The optical signals measured (PPGs) are highly susceptible to motion, which can distort the PPG derived data. It is hypothesized that motion induced opticalartifacts in PPGs correlate to movement of the sensor with respect to the skin. To investigate this correlation, a displacement measuring method using the self-mixing interferometric effect of a laser diode has been designed and tested in a laboratory setup. It is shown that displacement between the laser diode and a skin phantom can be measured accurately using the proposed method. Therefore the proposedmethod can be applied to measure displacement between a PPG sensorand skin and used to determine whether sensor displacement correlates to optical motion artifacts in PPGs. Conclusion - It has been demonstrated that displacement between a laser diode and a Delrin skinphantom can be accurately measured using the SMI effect of a laser diode of which the driving current is amplitude modulated. Therefore,this method can be applied to measure displacement between a PPG sensor and skin, and used to determine whether sensor displacement correlates to optical motion artifacts in PPGs.
Source: TU/e Research Portal
Institution: Eindhoven University of Technology
Language: English
Subfield: Biomedical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W1571216825