Heart Rate Demodulation System for BCG Signal Analysis

In order to achieve portable heart rate signal acquisition and analysis, and to benchmark the precision of electrocardiogram testing, a heart rate demodulation system based on fiber optic sensing is proposed. The heart impact signal of the tester is obtained through an FBG sensor, which is encapsulated in a flexible silicone sheet. The cardiac shock signal obtained from the test is used to invert the spectral shape of heart rate through the HRV algorithm. The calculation relationships of multiple parameters such as overall variability, short-term variability, and power spectral density were derived. The experimental test results show that quantitative analysis of JJ interval can effectively calculate heart rate values with an accuracy of ± 1bpm. It compared the distribution range of core parameters. Statistical analysis of test data can obtain a histogram of JJ intervals. From the distribution of the histogram, it can be seen that the test data has good stability. It validates the feasibility of this algorithm.