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2 results on '"fiber F-P tunable filter"'

1. A High-Precision Wavelength Demodulation Method Based on Optical Fiber Fabry-Perot Tunable Filter

Author

Wanshan Zhu, Jin Wang, Junfeng Jiang, Xinggang Liu, and Tiegen Liu

Subjects
Data acquisition card, demodulation algorithm, fiber Bragg grating, Fabry-Perot, F-P etalon, fiber F-P tunable filter, Electrical engineering. Electronics. Nuclear engineering, TK1-9971
Abstract

A high-precision wavelength demodulation method based on optical fiber Fabry-Perot tunable (FPT) filter is proposed for the fiber Bragg grating temperature sensing system. This algorithm uses the original sampling data obtained from the data acquisition card to simultaneously calculate the transmission spectrum of the F-P etalon (FPE) and the reflection spectrum of the fiber Bragg grating (FPG) sensors. In each scanning cycle, the transmission spectrum wavelength of the F-P etalon (FPE) is calibrated dynamically in real time, the reflectance spectrum central wavelength of the FPE sensors is calculated by referring to the transmission spectrum wavelength of the FPE that has been calibrated. It effectively weakens the perturbation effect caused by the nonlinear and non-reproducibility of narrowband light source from the fiber FPT filter, reduces the numerical error and effectively eliminates the pseudo peak of the FPE, and greatly improves the measurement accuracy of the system. Most programming languages can implement this algorithm. A temperature sensing experiment for the proposed method has been carried out. Results showed that the demodulation precision by our method could reach up to ±0.2 °C, wavelength demodulation accuracy 3 pm.

Published
2018
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2. A High-Precision Wavelength Demodulation Method Based on Optical Fiber Fabry-Perot Tunable Filter

Author

Jin Wang, Junfeng Jiang, Xinggang Liu, Tiegen Liu, and Wanshan Zhu

Subjects
Accuracy and precision, Optical fiber, Materials science, General Computer Science, Physics::Optics, 02 engineering and technology, law.invention, fiber Bragg grating, 020210 optoelectronics & photonics, Data acquisition, Optics, Narrowband, Fiber Bragg grating, law, 0202 electrical engineering, electronic engineering, information engineering, Demodulation, General Materials Science, F-P etalon, fiber F-P tunable filter, business.industry, Fabry-Perot, General Engineering, Wavelength, demodulation algorithm, Data acquisition card, lcsh:Electrical engineering. Electronics. Nuclear engineering, business, lcsh:TK1-9971, Fabry–Pérot interferometer
Abstract

A high-precision wavelength demodulation method based on optical fiber Fabry-Perot tunable (FPT) filter is proposed for the fiber Bragg grating temperature sensing system. This algorithm uses the original sampling data obtained from the data acquisition card to simultaneously calculate the transmission spectrum of the F-P etalon (FPE) and the reflection spectrum of the fiber Bragg grating (FPG) sensors. In each scanning cycle, the transmission spectrum wavelength of the F-P etalon (FPE) is calibrated dynamically in real time, the reflectance spectrum central wavelength of the FPE sensors is calculated by referring to the transmission spectrum wavelength of the FPE that has been calibrated. It effectively weakens the perturbation effect caused by the nonlinear and non-reproducibility of narrowband light source from the fiber FPT filter, reduces the numerical error and effectively eliminates the pseudo peak of the FPE, and greatly improves the measurement accuracy of the system. Most programming languages can implement this algorithm. A temperature sensing experiment for the proposed method has been carried out. Results showed that the demodulation precision by our method could reach up to ±0.2 °C, wavelength demodulation accuracy 3 pm.

Published
2018

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