Michelson liquid-level sensor based on cascaded no-core fiber and single-mode fiber structure

AbstractThe Michelson liquid-level sensor based on silver coated the end face of the three-core fiber reflection structure has been proposed to measure continuous or discrete liquid level. The Michelson interference structure can be obtained by the combination of the single-mode optical fiber and the three-core optical fiber with the silver film coated on the other end face of it. The inter-mode interference can be obtained by the fiber-core mismatch at the fusion joint. The liquid level can be measured by monitoring the dip wavelength shift of the interference spectrum. The results indicate that the sensitivity of the liquid-level sensor will decrease with the increasing sensing length. The sensing length of 30 mm is selected to investigate the performance of the sensor. The sensitivity of water level is reached as high as 392.83 pm/mm with an excellent linearity of 0.99946. Interestingly, the sensitivity of the sensor increases with the liquid refractive index and the sensitivity of the refractive index for NaCl solution is 4410.74 pm/mm/RIU. The performance of the sensor is very stable in the range of 20–90 °C. The maximum drift for temperature is 0.3001 nm. The sensor can be applied to the measurement of the liquid level in different environments.

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Sub-micrometer resolution liquid level sensor based on a hollow core fiber structure

Optics Letters ◽

10.1364/ol.44.002125 ◽

2019 ◽

Vol 44 (8) ◽

pp. 2125 ◽

Cited By ~ 13

Author(s):

Dejun Liu ◽

Fengzi Ling ◽

Rahul Kumar ◽

Arun Kumar Mallik ◽

Ke Tian ◽

...

Keyword(s):

Liquid Level ◽

Hollow Core ◽

Fiber Structure ◽

Level Sensor ◽

Core Fiber ◽

Liquid Level Sensor

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High sensitivity liquid level sensor for microfluidic applications using a hollow core fiber structure

Sensors and Actuators A Physical ◽

10.1016/j.sna.2021.113134 ◽

2021 ◽

pp. 113134

Author(s):

Dejun Liu ◽

Wei Li ◽

Qiang Wu ◽

Haoyu Zhao ◽

Fengzi Ling ◽

...

Keyword(s):

High Sensitivity ◽

Liquid Level ◽

Hollow Core ◽

Fiber Structure ◽

Level Sensor ◽

Core Fiber ◽

Liquid Level Sensor

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Liquid level sensor based on dynamic Fabry–Perot interferometers in processed capillary fiber

Scientific Reports ◽

10.1038/s41598-021-82193-5 ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Pablo Roldán-Varona ◽

Rosa Ana Pérez-Herrera ◽

Luis Rodríguez-Cobo ◽

Luis Reyes-González ◽

Manuel López-Amo ◽

...

Keyword(s):

Optical Fiber Sensor ◽

Liquid Level ◽

Hollow Core ◽

Immiscible Liquids ◽

Fabry Perot ◽

Detection Mode ◽

Level Sensor ◽

Core Fiber ◽

Liquid Level Sensor ◽

Silica Capillary

AbstractIn this work, a novel optical fiber sensor capable of measuring both the liquid level and its refractive index is designed, manufactured and demonstrated through simulations and experimentally. For this, a silica capillary hollow-core fiber is used. The fiber, with a sensing length of 1.55 mm, has been processed with a femtosecond laser, so that it incorporates four holes in its structure. In this way, the liquid enters the air core, and it is possible to perform the sensing through the Fabry–Perot cavities that the liquid generates. The detection mode is in reflection. With a resolution of 4 μm (liquid level), it is in the state of the art of this type of sensor. The system is designed so that in the future it will be capable of measuring the level of immiscible liquids, that is, liquids that form stratified layers. It can be useful to determine the presence of impurities in tanks.

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