Fiber-optic Michelson interferometer for detecting coolant level and refractive index
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Luqiao Feng
,
Qili Zhang
Abstract
This paper presents an interferometer based on a single-mode fiber-multimode fiber-thin-core fiber (SMF–MMF–TCF) Michelson interference structure that can be used for the measurements of coolant level and refractive index. Because of the different diameters of the cores of the individual fibers, optical excitation and coupling occur at the splicing points of the fibers. The multimode fibers are the couplers in the sensing structure, which allow the exciting light to enter the cladding of the thin-core fibers. The end face of the thin-core fiber is coated with a silver film to enhance the reflectivity of the light. The results show that the interference intensity first increases and then decreases with the length of TCF. When TCF is 4 cm, the interference light intensity is the strongest. The sensitivity of the sensor is 138.091 nm/RIU with the linearity of 0.977 over the refractive index of the coolant in the range of 1.3605–1.3880, and the temperature and time effects on the sensor are small. The proposed sensor has the advantages of simple fabrication, high repeatability, and good stability and it can be applied to the measurements of coolant level and refractive index in automotive engines.
Funding source: Chongqing University of Technology http://dx.doi.org/10.13039/501100004867
Award Identifier / Grant number: KLA20039
Funding source: Venture & Innovation Support Program for Chongqing Overseas Returnees
Award Identifier / Grant number: Cx2019092
Funding source: National Natural Science Foundation of China http://dx.doi.org/10.13039/501100001809
Award Identifier / Grant number: 51574054
Funding source: National Natural Science Foundation of China
Award Identifier / Grant number: Unassigned
Funding source: Chongqing University
Award Identifier / Grant number: Unassigned
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Author contribution: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
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Research funding: This work was supported by the National Natural Science Foundation of China (51574054), the Venture & Innovation Support Program for Chongqing Overseas Returnees (Cx2019092), and Chongqing University of Technology (No. KLA20039).
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Conflict of interest statement: The authors declare no conflicts of interest regarding this article.
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Articles in the same Issue
- Frontmatter
- General
- Fiber-optic Michelson interferometer for detecting coolant level and refractive index
- Dynamical Systems & Nonlinear Phenomena
- Qualitative analysis of an eco-epidemiological model with a role of prey and predator harvesting
- Similarity solution for one dimensional motion of a magnetized self-gravitating gas with variable density under the absorption of monochromatic radiation
- Dust–ion acoustic solitary waves in a collisionless magnetized five components plasma
- Hydrodynamics
- Pressure-exerted steady laminar flow of an incompressible fluid along a porous parallel-walled channel with an impermeable wall
- Solid State Physics & Materials Science
- Local structure and electron density distribution analysis of tin(II) sulfide using pair distribution function and maximum entropy method
- Mechanical and thermophysical properties of 4d-transition metal mononitrides
- Photoluminescence properties of Eu3+ doped CaSr(WO4)2 phosphor by Li+ charge compensation
