Laser Frequency Noise Cancelation in a Phase-Shifted Fiber Bragg Grating Ultrasonic Sensor System Using a Reference Grating Channel
In an ultrasonic sensor system based on <inline-formula> <tex-math notation="LaTeX">$\pi$</tex-math></inline-formula> phase-shifted fiber Bragg gratings <inline-formula> <tex-math notation="LaTeX">$(\pi\text{FBGs})$</tex-math></inline-...
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IEEE
2016-01-01
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| Series: | IEEE Photonics Journal |
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| Online Access: | https://ieeexplore.ieee.org/document/7400917/ |
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| author | Lingling Hu Guigen Liu Yupeng Zhu Xiangyu Luo Ming Han |
| author_facet | Lingling Hu Guigen Liu Yupeng Zhu Xiangyu Luo Ming Han |
| author_sort | Lingling Hu |
| collection | DOAJ |
| description | In an ultrasonic sensor system based on <inline-formula> <tex-math notation="LaTeX">$\pi$</tex-math></inline-formula> phase-shifted fiber Bragg gratings <inline-formula> <tex-math notation="LaTeX">$(\pi\text{FBGs})$</tex-math></inline-formula>, a cost-effective way for sensor demodulation is to set the laser wavelength at the center of the steep spectral slope of the <inline-formula> <tex-math notation="LaTeX">$\pi\text{FBG}$</tex-math></inline-formula> refection spectrum. Frequency noise of the laser source ultimately limits the signal-to-noise ratio (SNR) of the sensor system. Here, we demonstrate a noise cancelation method based on a pair of <inline-formula> <tex-math notation="LaTeX">$\pi\text{FBGs}$</tex-math></inline-formula>, which is capable of improving the SNR of system beyond the limitation set by the laser frequency noise. In this method, one of the gratings is used as the sensor to detect the acoustic signal, and the other grating, isolated from the signal, is used as a reference that gives the noise information. Employing a data postprocessing method, the noise is subtracted from the original detected signal. We show that the SNR of the sensor system can be improved by up to 20 dB using this method. |
| format | Article |
| id | doaj-art-6978020c414c4e6ba3b1affdee925bef |
| institution | Kabale University |
| issn | 1943-0655 |
| language | English |
| publishDate | 2016-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Photonics Journal |
| spelling | doaj-art-6978020c414c4e6ba3b1affdee925bef2025-08-20T03:31:23ZengIEEEIEEE Photonics Journal1943-06552016-01-01811810.1109/JPHOT.2016.25270187400917Laser Frequency Noise Cancelation in a Phase-Shifted Fiber Bragg Grating Ultrasonic Sensor System Using a Reference Grating ChannelLingling Hu0Guigen Liu1Yupeng Zhu2Xiangyu Luo3Ming Han4Dept. of Electr. & Comput. Eng., Univ. of Nebraska - Lincoln, Lincoln, NE, USADept. of Electr. & Comput. Eng., Univ. of Nebraska - Lincoln, Lincoln, NE, USADept. of Electr. & Comput. Eng., Univ. of Nebraska - Lincoln, Lincoln, NE, USADept. of Electr. & Comput. Eng., Univ. of Nebraska - Lincoln, Lincoln, NE, USADept. of Electr. & Comput. Eng., Univ. of Nebraska - Lincoln, Lincoln, NE, USAIn an ultrasonic sensor system based on <inline-formula> <tex-math notation="LaTeX">$\pi$</tex-math></inline-formula> phase-shifted fiber Bragg gratings <inline-formula> <tex-math notation="LaTeX">$(\pi\text{FBGs})$</tex-math></inline-formula>, a cost-effective way for sensor demodulation is to set the laser wavelength at the center of the steep spectral slope of the <inline-formula> <tex-math notation="LaTeX">$\pi\text{FBG}$</tex-math></inline-formula> refection spectrum. Frequency noise of the laser source ultimately limits the signal-to-noise ratio (SNR) of the sensor system. Here, we demonstrate a noise cancelation method based on a pair of <inline-formula> <tex-math notation="LaTeX">$\pi\text{FBGs}$</tex-math></inline-formula>, which is capable of improving the SNR of system beyond the limitation set by the laser frequency noise. In this method, one of the gratings is used as the sensor to detect the acoustic signal, and the other grating, isolated from the signal, is used as a reference that gives the noise information. Employing a data postprocessing method, the noise is subtracted from the original detected signal. We show that the SNR of the sensor system can be improved by up to 20 dB using this method.https://ieeexplore.ieee.org/document/7400917/SensorsFiber gratingsDiode lasers |
| spellingShingle | Lingling Hu Guigen Liu Yupeng Zhu Xiangyu Luo Ming Han Laser Frequency Noise Cancelation in a Phase-Shifted Fiber Bragg Grating Ultrasonic Sensor System Using a Reference Grating Channel IEEE Photonics Journal Sensors Fiber gratings Diode lasers |
| title | Laser Frequency Noise Cancelation in a Phase-Shifted Fiber Bragg Grating Ultrasonic Sensor System Using a Reference Grating Channel |
| title_full | Laser Frequency Noise Cancelation in a Phase-Shifted Fiber Bragg Grating Ultrasonic Sensor System Using a Reference Grating Channel |
| title_fullStr | Laser Frequency Noise Cancelation in a Phase-Shifted Fiber Bragg Grating Ultrasonic Sensor System Using a Reference Grating Channel |
| title_full_unstemmed | Laser Frequency Noise Cancelation in a Phase-Shifted Fiber Bragg Grating Ultrasonic Sensor System Using a Reference Grating Channel |
| title_short | Laser Frequency Noise Cancelation in a Phase-Shifted Fiber Bragg Grating Ultrasonic Sensor System Using a Reference Grating Channel |
| title_sort | laser frequency noise cancelation in a phase shifted fiber bragg grating ultrasonic sensor system using a reference grating channel |
| topic | Sensors Fiber gratings Diode lasers |
| url | https://ieeexplore.ieee.org/document/7400917/ |
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