Non-invasive human extremely weak pulse wave measurement based on a high-precision laser self-mixing interferometer

In this paper, a technique based on laser self-mixing effect for acquiring pulse wave profile is proposed and demonstrated. For the characteristics of extremely weak vibration in human pulse waves, a method of multiple reflections with external cavity is designed to improve the measurement accuracy...

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Bibliographic Details
Published in:Optoelectronics letters 2017-03, Vol.13 (2), p.143-146
Main Author: 魏颖斌 魏铮 黄文财 张杰 张丽娟
Format: Article
Language:English
Subjects:
Correlation coefficients
Lasers
Optical Devices
Optics
Photonics
Physics
Physics and Astronomy
Root-mean-square errors
Wave measurement
侵入
干涉仪
测量精度
激光
脉冲波形
脉搏波
自混合效应
高精度
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Summary:In this paper, a technique based on laser self-mixing effect for acquiring pulse wave profile is proposed and demonstrated. For the characteristics of extremely weak vibration in human pulse waves, a method of multiple reflections with external cavity is designed to improve the measurement accuracy to λ/4. Based on the fringe counting algorithm, one period of pulse wave is successfully reconstructed. The measurement results show that the root mean square error（RMSE） of the reconstructed pulse wave is 0.912 μm at sampling rate of 8 k Hz. Besides, the correlation coefficients and heart beats of this method and the traditional photoplethysmography（PPG） measurement are analyzed.
ISSN:1673-1905
1993-5013
DOI:10.1007/s11801-017-6275-7