Infrared and Laser Engineering, Volume. 50, Issue 7, 20210223(2021)
Signal feature extraction method based on MEEMD-HHT for distributed optical fiber vibration sensing system
Figures & Tables(16)
Fig. 1. Experimental device diagram of distributed optical vibration sensing system
Fig. 2. Vibration simulation signal and the composition of the time-domain waveform
Fig. 7. Phase-time change curves of vibration signals of different frequencies demodulated by the system
Fig. 8. Hilbert spectrum after three kinds of empirical mode decomposition and Hilbert transforn of vibration signal whose frequency is 100 Hz
Fig. 9. Hilbert spectrum after three kinds of empirical mode decomposition and Hilbert transforn of vibration signal whose frequency is 200 Hz
Fig. 10. Hilbert spectrum after three kinds of empirical mode decomposition and Hilbert transforn of vibration signal whose frequency is 50 Hz，200 Hz，350 Hz
Fig. 11. Hilbert spectrum after three kinds of empirical mode decomposition and Hilbert transforn of vibration signal whose frequency is 150 Hz，250 Hz，450 Hz
Fig. 12. Marginal spectra of three decomposition methods on different frequencies
Table 1. Permutation entropy of eight signals
View tableView in ArticleTable 1. Permutation entropy of eight signals
${x_1}\left( t \right)$ ${x_2}\left( t \right)$ ${x_3}\left( t \right)$ ${x_4}\left( t \right)$ ${x_5}\left( t \right)$ ${x_6}\left( t \right)$ ${x_7}\left( t \right)$ ${x_8}\left( t \right)$ ${H_p}$ 0.4610 0.1753 0.2002 0.1427 0.0060 0.2273 0.6163 0.9689
Table 2. Each method index
View tableView in ArticleTable 2. Each method index
Method Added noise’ amplitude： ${a_i}$ Added noise’ number: ${N_e}$ Computing time/s Completeness Index of orthogonality IMF’s number EMD None None 0.1819 0.2664 0.4171 7 CEEMD 0.3 50 6.5873 0.1897 0.2053 7 MEEMD 0.3 50 1.2732 0.0152 0.0027 4
Table 3. Frequency extraction accuracy test
View tableView in ArticleTable 3. Frequency extraction accuracy test
Test frequency/Hz 10 50 100 150 200 300 400 500 Average accuracy The average time/s Sample number/Group 50 50 50 50 50 50 50 50 EMD’s accuracy 78% 80% 84% 86% 88% 86% 83% 80% 83.1% 0.1635 CEEMD’s accuracy 90% 86% 94% 94% 92% 96% 91% 90% 91.6% 3.2534 MEEMD’s accuracy 98% 98% 100% 100% 100% 100% 100% 98% 99.2% 1.0387
Table 4. Three methods of experimental results
View tableView in ArticleTable 4. Three methods of experimental results
Feature extraction method Average accuracy Average number of eigenvectors Average time/s EMD-HHT 82.5% 9.2 3.8634 CEEMD-HHT 91.1% 7.1 7.1857 MEEMD-HHT 98.1% 4.2 3.8259
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Miao Yu, Yaolu Zhang, Zechen Xu, Yutong He. Signal feature extraction method based on MEEMD-HHT for distributed optical fiber vibration sensing system[J]. Infrared and Laser Engineering, 2021, 50(7): 20210223
Paper Information
Category: Optical communication and sensing
Received: Apr. 3, 2021
Accepted: --
Published Online: Aug. 23, 2021
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