Jing Tian, Mei-Jiang Hou, Yang Jiang, Hong-Xu Zhang, Guang-Fu Bai, Hao Feng. High sensitivity fiber displacement sensor based compound ring laser cavity with linear variation of beat frequency signal [J]. Acta Physica Sinica, 2020, 69(18): 184217-1
- Acta Physica Sinica
- Vol. 69, Issue 18, 184217-1 (2020)
Fig. 1. Schematic diagram of the proposed fiber laser displacement sensor.
Fig. 2. Fiber laser cavity’s excited longitudinal modes controlled by π-FBG’s bandwidth.
Fig. 3. (a) Optical spectra of Filter, FBG and π-FBG; (b) optical spectrum of the compound ring laser sensor cavity.
Fig. 4. Beat frequency spectra of BFS.
Fig. 5. (a) Beat frequency spectrum of straight cavity; (b) beat frequency spectrum of compound ring laser cavity.
Fig. 6. Beat signal spectra shifts as a function of displacement variations.
Fig. 7. Measured results analysis of the displacement sensor.
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