Single-mode fiber sensor based on core-offset splicing

In this work, a relative humidity (RH) sensor based on a structure with multimode interference is proposed and experimentally demonstrated. The multimode sensor is fabricated by fusion splicing a coreless fiber section to a single mode fiber. A hydrophilic agarose gel is coated on the coreless fiber, using the dip coating technique. By changing the surrounding RH, the refractive index of the coated agarose gel will change, causing a wavelength shift of the peak in the reflection spectra. For RH variations in the range between 60.0%RH and 98.5%RH, the sensor presents a maximum sensitivity of 44.2 pm/%RH, and taking in consideration the interrogation system, a resolution of 0.5%RH is acquired. This sensor has a great potential in real time RH monitoring and can be of interest for applications where a control of high levels of relative humidity is required.

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Optimization Design of SNS Sensor Structural Parameters for Battery Expansion Monitoring

Frontiers in Energy Research ◽

10.3389/fenrg.2021.725458 ◽

2021 ◽

Vol 9 ◽

Author(s):

Shibo Xu ◽

Zhe Wang ◽

Hanrui Yang ◽

Shengxi Jiao ◽

Jien Liu ◽

...

Keyword(s):

Refractive Index ◽

Electrolyte Solution ◽

Optimization Design ◽

Structural Parameters ◽

Single Mode ◽

Measurement Range ◽

Single Mode Fiber ◽

Fiber Sensor ◽

Sensor Structure ◽

Core Fiber

In this article, a method to improve refractive index (RI) sensitivity of single‐mode–no core–single‐mode fiber (SNS) sensor structure is addressed by optimization of geometric parameters of no-core fiber (NCF), which could be used to accurately measure the irreversible deformation of the battery expansion state caused by temperature change. From the perspective of temperature changing RI of the electrolyte solution, the impacts of diameter, length, and waveband on the performance of the fiber sensor have been discussed as RI measurement range is 1.340–1.390. After optimization, RI sensitivity can reach approximately 2,252.7 and 2037.3 nm/RIU with the length of 6.55 and 6.75 mm when the RI is from 1.380 to 1.390.

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Photonics Crystal Fiber Sensor Using for Sensing Environmental Pollution

10.20944/preprints202105.0314.v1 ◽

2021 ◽

Author(s):

Omar S.Hassan*

Keyword(s):

Environmental Pollution ◽

Single Mode ◽

Single Mode Fiber ◽

Fiber Sensor ◽

Optical Source ◽

Crystal Fiber ◽

Sensor Model ◽

Zinc Cadmium ◽

Optical Crystal ◽

Crystal Fibers

The aim of this paper is to create a sensor model based on optical crystal fibers (PCF). The aim of this model is to find and identify zinc cadmium. This thesis looked at three different categories of concentrations. For sensor architecture, PCF was generated using single-mode fiber-to-end split fusion (SM-PCF-SM). In this experiment, a specific wavelength spectrum was used to alter the concentration of materials covering the fiber in order to demonstrate the fiber's sensing capability. The 550nm wavelength has been used as the optical source for the fiber. The change in the output power of the external light was monitored and changes were observed for each concentration of the concentrations around the fiber. It has been found that the fiber is sensitive to small changes in concentrations. The absorption of the fiber has been calculated for the incoming capacity, as well as the losses in the capacity outside the fiber.

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