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Liquid level sensor based on an excessively tilted fibre grating
- Source :
- Optics Communications. 305:271-275
- Publication Year :
- 2013
- Publisher :
- Elsevier BV, 2013.
-
Abstract
- We propose and demonstrate an optical liquid level sensor based on the surrounding medium refractive index (SRI) sensing using an excessively tilted fibre grating (ETFG). When the ETFG submerged in water, two sets of cladding modes are coupled, corresponding to air- and water-surrounded grating structures, respectively. The coupling strengths of the two sets of cladding modes evolve with the submerging length of the grating, providing a mechanism to measure the liquid level. Comparing with long-period fibre grating based liquid level sensor, the ETFG sensor has a much higher SRI responsivity for liquids with refractive index around 1.33 and a lower thermal cross sensitivity.
- Subjects :
- Materials science
Holographic grating
business.industry
Physics::Optics
Grating
Cladding (fiber optics)
Atomic and Molecular Physics, and Optics
Electronic, Optical and Magnetic Materials
law.invention
Subwavelength-diameter optical fibre
Ultrasonic grating
Optics
law
Blazed grating
Level sensor
Electrical and Electronic Engineering
Physical and Theoretical Chemistry
business
Refractive index
Subjects
Details
- ISSN :
- 00304018
- Volume :
- 305
- Database :
- OpenAIRE
- Journal :
- Optics Communications
- Accession number :
- edsair.doi...........d7b78bf1df60ae10e12ef753a1f9cd12