Monitoring of basic human vital functions using optical interferometer
In this paper, a method is presented for monitoring of basic human vital functions (heartbeat and respiration) by using optical fibre interferometer. Optical fibre interferometer is a sensitive device which detects physical changes of the optical fibre length. If a person is in physical contact with the fibre, such as having it in bed, the fibre interferometers responds to small changes in fibre length induced by the heartbeat and breathing. This allows for unobtrusive and continuous monitoring of a persons vital life signs. The interferometer, however, has a cosine signal transfer characteristic, which complicates the feature extraction algorithms. An experiment was performed with the optical fibre on the mattress. Heartbeat and respiration were extracted using a method based on zero-crossings in the measured interferential signal and a preselected filter bank. The methods recognition rate and accuracy were verified by using reference sensors (an ECG apparatus and nasal air-flow measurements). All signals were acquired simultaneously from 5 male persons in duration of about 60 s. The obtained results prove this simple, unobtrusive approach can monitor human vital signs with fairly high recognition rate: about 95.7％ for heartbeat and 93.8％ for respiration.
human vital functions monitoring optical interferometer heartbeat monitoring respiration rate monitoring
Sebastijan Sprager Denis Donlagic Damjan Zazula
University of Maribor, Faculty of Electrical Engineering and Computer Science, Maribor, Slovenia
国际会议
2010 IEEE 10th International Conference on Signal Processing(第十届信号处理国际会议 ICSP 2010)
北京
英文
1738-1741
2010-08-24（万方平台首次上网日期，不代表论文的发表时间）