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Proceedings Paper

Research on fiber Bragg grating heart sound sensing and wavelength demodulation method
Author(s): Cheng Zhang; Chang-yun Miao; Hua Gao; Jing-meng Gan; Hong-qiang Li
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Paper Abstract

Heart sound includes a lot of physiological and pathological information of heart and blood vessel. Heart sound detecting is an important method to gain the heart status, and has important significance to early diagnoses of cardiopathy. In order to improve sensitivity and reduce noise, a heart sound measurement method based on fiber Bragg grating was researched. By the vibration principle of plane round diaphragm, a heart sound sensor structure of fiber Bragg grating was designed and a heart sound sensing mathematical model was established. A formula of heart sound sensitivity was deduced and the theoretical sensitivity of the designed sensor is 957.11pm/KPa. Based on matched grating method, the experiment system was built, by which the excursion of reflected wavelength of the sensing grating was detected and the information of heart sound was obtained. Experiments show that the designed sensor can detect the heart sound and the reflected wavelength variety range is about 70pm. When the sampling frequency is 1 KHz, the extracted heart sound waveform by using the db4 wavelet has the same characteristics with a standard heart sound sensor.

Paper Details

Date Published: 9 November 2010
PDF: 7 pages
Proc. SPIE 7853, Advanced Sensor Systems and Applications IV, 78531Q (9 November 2010); doi: 10.1117/12.868762
Show Author Affiliations
Cheng Zhang, Tianjin Polytechnic Univ. (China)
Chang-yun Miao, Tianjin Polytechnic Univ. (China)
Hua Gao, Tianjin Polytechnic Univ. (China)
Jing-meng Gan, Tianjin Polytechnic Univ. (China)
Hong-qiang Li, Tianjin Polytechnic Univ. (China)

Published in SPIE Proceedings Vol. 7853:
Advanced Sensor Systems and Applications IV
Brian Culshaw; Yanbiao Liao; Anbo Wang; Xiaoyi Bao; Xudong Fan; Lin Zhang, Editor(s)

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