Longxiang Shen, Hao Feng, Zhou Sha, Zhoumo Zeng. Pattern Recognition of Heterodyne Phase-Sensitive Optical Time-Domain Reflection Technique Based on Down Conversion and IQ Demodulation[J]. Acta Optica Sinica, 2017, 37(8): 0806005
- Acta Optica Sinica
- Vol. 37, Issue 8, 0806005 (2017)
Fig. 1. Diagram of system structure
Fig. 2. Diagram of FPGA and its peripheral circuit
Fig. 3. (a) Waveform of original signal; (b) waveform of down conversion signal
Fig. 4. Principle of IQ demodulation
Fig. 5. Diagram of IQ demodulation module of FPGA
Fig. 6. Verification of IQ demodulation of FPGA
Fig. 7. Software flow chart of DSP
Fig. 8. Location curve
Fig. 9. (a) Original image; (b) intercept image
Fig. 10. Image enhancement. (a) Original image; (b) mean filtering; (c) Laplacian sharpening; (d) image after enhancement
Fig. 11. Images of binaryzation, expansion and corrosion of (a)-(c) PZT vibration images, (d)-(f) vibration images when car is passing through and (g)-(i) artificial disturbance images
Fig. 12. FDR of each feature
Fig. 13. Model of BP neural network
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Table 1. Evaluation of DSP time consuming
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