Liming Mao, Chuanyi Tao, Zidi Gu, Jing Zhang, Junhua Cheng, Xuhai Jiang, Na Li. Dynamic Strain Sensing System Based on Fiber Ring Laser[J]. Acta Optica Sinica, 2019, 39(10): 1006006
- Acta Optica Sinica
- Vol. 39, Issue 10, 1006006 (2019)
Fig. 1. Diagram of sensing system. (a) Diagram of fiber ring laser based on SOA; (b) reflection spectrum of FBG; (c) transmission spectrum of FFP filter
Fig. 2. Simulation results. (a) Transmission spectrum of FFP filter; (b) relationship between output optical power and wavelength difference δλ
Fig. 3. Relationship between detection sensitivity and wavelength difference δλ
Fig. 4. Diagram of demodulation principle. (a) Transmission spectrum of FFP filter and reflection spectrum of FBG; (b) demodulation range of 0.2-nm bandwidth FBG corresponding to FFP filter with 100-GHz channel interval
Fig. 5. Spectra of FBG and FFP filter
Fig. 6. Demodulation results of dynamic strain signals (3 με) at different frequencies. (a) 5 kHz; (b) 10 kHz; (c) 60 kHz; (d) 200 kHz
Fig. 7. Demodulation results of different dynamic signals and Fourier transform spectra. (a) 18 MHz and 20 MHz demodulation signals; (b) fast Fourier transform of 18 MHz and 20 MHz demodulation signals
Fig. 8. Demodulation results of ultrasound signals. (a) Demodulation results of 33 kHz transient ultrasound signal; (b) demodulation results of 33 kHz continuous ultrasound signal
Fig. 9. Spectra of FBG and FFP filter for multiplex demodulation
Fig. 10. Multiplexed demodulation signal of the system
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