A Demodulation Method of Spatial Domain for Low-Coherence Interferometry With High Accuracy and Adaptability
A demodulation method of spatial domain based on low-coherence interferometry is proposed. The original signal of spatial domain acquired by linear CCD is filtered with all-phase filter to obtain the fringe pattern, and the phase signal of the spatial frequency domain is retained after filtering. Th...
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| Format: | Article |
| Language: | English |
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IEEE
2020-01-01
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| Series: | IEEE Photonics Journal |
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| Online Access: | https://ieeexplore.ieee.org/document/9020149/ |
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| author | Chao Wang Xuezhi Zhang Junfeng Jiang Kun Liu Shuang Wang Yuanyao Li Tiegen Liu |
| author_facet | Chao Wang Xuezhi Zhang Junfeng Jiang Kun Liu Shuang Wang Yuanyao Li Tiegen Liu |
| author_sort | Chao Wang |
| collection | DOAJ |
| description | A demodulation method of spatial domain based on low-coherence interferometry is proposed. The original signal of spatial domain acquired by linear CCD is filtered with all-phase filter to obtain the fringe pattern, and the phase signal of the spatial frequency domain is retained after filtering. The fringe pattern analysis is employed to avoid phase ambiguity and realize large measurement range in demodulation. Afterwards, using the centroid position of the fringe, the peak position of a single fringe pattern can be obtained, and finally the accurate peak position is calculated with seven-step phase-shifting interferometry. The demodulation method is demonstrated experimentally with Fabry-Perot sensing system. At room temperature, it is proved that the full-scale measurement error is less than 0.019% in the range of 11 kPa to 290 kPa. From −20 °C to 70 °C, the accuracy is stable and the maximum error is less than 0.054 kPa. The demodulation method has the potential to enhance the measurement accuracy and adaptability in actual environment for universal applications. |
| format | Article |
| id | doaj-art-d6bb70312fe948bf908fc94767b30286 |
| institution | Kabale University |
| issn | 1943-0655 |
| language | English |
| publishDate | 2020-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Photonics Journal |
| spelling | doaj-art-d6bb70312fe948bf908fc94767b302862025-08-20T03:33:21ZengIEEEIEEE Photonics Journal1943-06552020-01-0112211110.1109/JPHOT.2020.29778399020149A Demodulation Method of Spatial Domain for Low-Coherence Interferometry With High Accuracy and AdaptabilityChao Wang0https://orcid.org/0000-0001-5385-6230Xuezhi Zhang1https://orcid.org/0000-0001-9241-251XJunfeng Jiang2https://orcid.org/0000-0003-0393-8451Kun Liu3https://orcid.org/0000-0003-2460-6851Shuang Wang4https://orcid.org/0000-0002-9809-4062Yuanyao Li5https://orcid.org/0000-0003-2953-1019Tiegen Liu6https://orcid.org/0000-0003-4141-6961School of Precision Instrument and Opto-Electronics Engineering, Tianjin University, Tianjin, ChinaSchool of Precision Instrument and Opto-Electronics Engineering, Tianjin University, Tianjin, ChinaSchool of Precision Instrument and Opto-Electronics Engineering, Tianjin University, Tianjin, ChinaSchool of Precision Instrument and Opto-Electronics Engineering, Tianjin University, Tianjin, ChinaSchool of Precision Instrument and Opto-Electronics Engineering, Tianjin University, Tianjin, ChinaTianjin Institute of Metrological Supervision and Testing, Tianjin, ChinaSchool of Precision Instrument and Opto-Electronics Engineering, Tianjin University, Tianjin, ChinaA demodulation method of spatial domain based on low-coherence interferometry is proposed. The original signal of spatial domain acquired by linear CCD is filtered with all-phase filter to obtain the fringe pattern, and the phase signal of the spatial frequency domain is retained after filtering. The fringe pattern analysis is employed to avoid phase ambiguity and realize large measurement range in demodulation. Afterwards, using the centroid position of the fringe, the peak position of a single fringe pattern can be obtained, and finally the accurate peak position is calculated with seven-step phase-shifting interferometry. The demodulation method is demonstrated experimentally with Fabry-Perot sensing system. At room temperature, it is proved that the full-scale measurement error is less than 0.019% in the range of 11 kPa to 290 kPa. From −20 °C to 70 °C, the accuracy is stable and the maximum error is less than 0.054 kPa. The demodulation method has the potential to enhance the measurement accuracy and adaptability in actual environment for universal applications.https://ieeexplore.ieee.org/document/9020149/Optical interferometrydemodulationfabry-perotoptical fiber sensorspressure measurementoptical fiber applications. |
| spellingShingle | Chao Wang Xuezhi Zhang Junfeng Jiang Kun Liu Shuang Wang Yuanyao Li Tiegen Liu A Demodulation Method of Spatial Domain for Low-Coherence Interferometry With High Accuracy and Adaptability IEEE Photonics Journal Optical interferometry demodulation fabry-perot optical fiber sensors pressure measurement optical fiber applications. |
| title | A Demodulation Method of Spatial Domain for Low-Coherence Interferometry With High Accuracy and Adaptability |
| title_full | A Demodulation Method of Spatial Domain for Low-Coherence Interferometry With High Accuracy and Adaptability |
| title_fullStr | A Demodulation Method of Spatial Domain for Low-Coherence Interferometry With High Accuracy and Adaptability |
| title_full_unstemmed | A Demodulation Method of Spatial Domain for Low-Coherence Interferometry With High Accuracy and Adaptability |
| title_short | A Demodulation Method of Spatial Domain for Low-Coherence Interferometry With High Accuracy and Adaptability |
| title_sort | demodulation method of spatial domain for low coherence interferometry with high accuracy and adaptability |
| topic | Optical interferometry demodulation fabry-perot optical fiber sensors pressure measurement optical fiber applications. |
| url | https://ieeexplore.ieee.org/document/9020149/ |
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