Polarization maintaining optical fiber multi-intruder sensor
| Autor: | M. Bathaee, Farnaz Farman, Sara Tofighi, Abolfazl Bahrampour, Alireza Bahrampour, M. Vali |
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| Rok vydání: | 2012 |
| Předmět: |
Physics
Optical fiber business.industry Noise reduction Polarization-maintaining optical fiber Signal Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials law.invention Superposition principle Interferometry Optics Signal-to-noise ratio law Fiber optic sensor Electrical and Electronic Engineering business |
| Zdroj: | Optics & Laser Technology. 44:2026-2031 |
| ISSN: | 0030-3992 |
| DOI: | 10.1016/j.optlastec.2012.03.032 |
| Popis: | In this paper, an optical fiber multi-intruder sensor based on polarization maintaining optical fiber (PMF), without any interferometric fiber loop, is introduced. To map the local coordinates of intruders on the beating spectrum of the output modes, radiation from a ramp frequency modulated laser is injected at the input of PMF optical fiber sensor. It is shown that the local coordinates and some characteristics of intruders can be obtained by the measurement of the frequencies and amplitudes of the output mode beating spectrum. Generally the number of beating frequencies is more than the number of intruders. Among the beating frequencies, a group with maximum signal to noise ratio is chosen. The short Fourier denoising method is employed to increase the sensor resolution. Because the output signal is the superposition of finite numbers of discrete frequencies this method is a powerful tool for denoising even for negative signal to noise ratio. |
| Databáze: | OpenAIRE |
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