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An optical liquid level sensor based on polarization maintaining
This document describes an optical liquid level sensor based on a polarization-maintaining fiber modal interferometer. The sensor uses a polarization-maintaining fiber spliced between two single-mode fibers to form an interferometer. Changes in the liquid level cause a change in the optical path difference, resulting in a wavelength shift that can be used to measure the liquid level. The sensor is easy to fabricate, structurally stable, and highly sensitive. Experimental results show that the wavelength shift increases linearly with liquid level and refractive index, and decreases with shorter fiber length and increasing temperature.
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An optical liquid level sensor based on polarization maintaining
- 1. An optical liquidlevel sensor based on polarization-maintaining fiber modal interferometer By: Sasicha Pornlert 6/6 No.5 Advisor: Kitisak Boonkham 1 Huaping G., Haifeng S., Sulei Z., Kai N., & Xinyong D. SEMINAR
- 2. Outline • Introduction – Polarization – Polarization-maintaining fiber (PMF) • Experiment & Principle – Diagram of experiment – Theory • Result & Discussion • Conclusion • Reference • Acknowledgement 2
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- 4. Introduction Industry Household Chemical Agriculture 4
- 5. Liquid Level sensor Benefit For Toxic Flammable 5
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- 7. Polarization-maintaining Fiber (PMF) 7 http://www.physicsclassroom.com/class/light/Lesson-1/Polarization
- 8. An Polarization-maintaining Fiber Modal Interferometer • Prevent electromagnetic interference • High sensitivity • Small size • Easy to fabricate • Robustness • Cheaper 8
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- 10. The Schematic Diagramof the Proposed Sensor 10 L L’ BBS OSA
- 11. The Schematic Diagramof the Proposed Sensor 11 Cladding Core Single Mode Fiber (SMF) Polarization-maintaining Fiber (PMF) Splicer L
- 12. Theory Where mis an integer 12 Path difference expressed by Wavelength Shift can satisfied by (1) From equation (1), it can obtain that is the resonant dip wavelength
- 13. Theory 13 Whenthe test liquid immersed the portion of sensor L L’ is the different of liquid and cladding index Liquid Level Length of PMF
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- 15. Graph of TransmissionSpectra of Level Sensor in Brine with the Reflective index of 1.363 Good Visibility 15
- 16. Graph of TransmissionSpectra under different Level of Brine Red Shift 16
- 17. Graph of Relationbetween Liquid Level and Wavelength Shift with different Reflective Indices Sensitivity is 17 Slope
- 18. Graph of Relationbetween Liquid Level and Wavelength Shift with different Length of PMF 18
- 19. Graph of Relationbetween Temperature and Wavelength Shift 19
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- 21. Conclusion • Wavelengthshift is almost linearly proportional to the change of liquid level • The sensitivity increases with the refractive index of liquid • The shorter the PMF is the higher sensitivity is • Temperature affect the experiment 21
- 22. An optical liquidlevel sensor based on polarization-maintaining fiber modal interferometer • Easy fabricate • Structural stability • High sensitivity 22 Another interesting way for measuring liquid level
- 23. Reference Huaping, G.,Haifeng, S., Sulei, Z., Kai, N., & Xinyong, D. (2013). An optical liquid level sensor based on polarization-maintaining fiber modal interferometer. Eslevier, 205 (2014), 204-207 Li, L. C., Xia, L., Xie, Z. H., & Liu, D. M., All-fiber Mach–Zehnder interferometers for sensing applications, Opt. Expr. 20 (2012), 11109–11120. Antonio-Lopez, J. E., Sanchez-Mondragon, J. J., LiKamWa, P., & May-Arrioja, D. A., Fiber-optic sensor for liquid level measurement, Opt. Lett. 36 (2011), 3425–3427. Geng, Y. F., Li, X. J., Tan, X. L., Deng, Y. L., & Yu, Y. Q. High-sensitivity Mach– Zehnder interferometric temperature fiber sensor based on a waist-enlarged fusion bitaper, IEEE Sens. J. 11 (2011), 2891–2894. Fusion splicing. Retrieved April 14, 2013 from the Wikipedia: http://en.wikipedia.org/wiki/Fusion_splicing 23
- 24. Reference Level sensor.Retrieved May 20, 2014 from the Wikipedia: http://en.wikipedia.org/wiki/Level_sensor#Sensors_for_both_point_level _detection_or_continuous_monitoring Polarization-maintaining optical fiber. Retrieved July 5, 2012 from the Wikipedia: http://en.wikipedia.org/wiki/Polarization-maintaining_ optical_fiber 24
- 25. Acknowledgement Thanks toMr. Kitisak Boonkham for advising and encouraging me to present this knowledge for benefit to everyone in here. 25
- 26. 26 Question Thankyou all