Highly sensitive liquid level sensor based on fiber core-offset attenuation

Ting-ting Wang; Ming Wang

doi:10.1117/12.837740

23 November 2009 Highly sensitive liquid level sensor based on fiber core-offset attenuation

Ting-ting Wang, Ming Wang

Proceedings Volume 7508, 2009 International Conference on Optical Instruments and Technology: Advanced Sensor Technologies and Applications; 750806 (2009) https://doi.org/10.1117/12.837740
Event: International Conference on Optical Instrumentation and Technology, 2009, Shanghai, China

Abstract

An all-fiber liquid level sensor based on core-offset attenuator is proposed and demonstrated. The interference fringe is affected by the fraction of the length of the interferometeric arm that is surrounded by the liquid. The experiments show that for a liquid level variation of 30mm, the maximum difference of attenuation changes about 3dB. Also in the linear region, a sensitivity of 0.84dB/mm is achieved. For a temperature range from 30°C to 80°C, the measured liquid level fluctuates less than 1% without any temperature compensation. The liquid level sensor we reported in this paper appears more robust and repeatable, and its ease of fabrication makes it a low cost alternative to existing fiber liquid level sensor.

Citation Download Citation

Ting-ting Wang and Ming Wang "Highly sensitive liquid level sensor based on fiber core-offset attenuation", Proc. SPIE 7508, 2009 International Conference on Optical Instruments and Technology: Advanced Sensor Technologies and Applications, 750806 (23 November 2009); https://doi.org/10.1117/12.837740

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