High-sensitivity refractive index sensors based on in-line holes in plastic optical fiber

2015 ◽  
Vol 57 (4) ◽  
pp. 918-921 ◽  
Author(s):  
Jong-Dug Shin ◽  
Jaehee Park
Keyword(s):  
Refractive Index ◽  
Optical Fiber ◽  
High Sensitivity ◽  
Plastic Optical Fiber ◽  
Refractive Index Sensors

Theoretical and experimental research of lossy mode resonance-based high-sensitivity optical fiber refractive index sensors

2019 ◽  
Vol 36 (8) ◽  
pp. 2069 ◽  
Author(s):  
Wan-Ming Zhao ◽  
Qi Wang ◽  
Xue-Zhou Wang ◽  
Xiang Li ◽  
Jian-Ying Jing ◽  
...  
Keyword(s):  
Refractive Index ◽  
Optical Fiber ◽  
Experimental Research ◽  
High Sensitivity ◽  
Refractive Index Sensors

Strain, torsion and refractive index sensors based on helical long period fibre grating inscribed in small-core fibre for structural condition monitoring

2021 ◽  
Vol 24 (6) ◽  
pp. 1248-1255
Author(s):  
Cailing Fu ◽  
Yi-Qing Ni ◽  
Tong Sun ◽  
Yiping Wang ◽  
Siqi Ding ◽  
...  
Keyword(s):  
Refractive Index ◽  
High Sensitivity ◽  
Single Mode ◽  
Structural Condition ◽  
Core Diameter ◽  
Small Core ◽  
Long Period ◽  
Sensing Applications ◽  
Core Fibre ◽  
Refractive Index Sensors

This study is intended to develop long period fibre grating sensors for potential applications in environmental and durability monitoring of coastal structures. High-quality helical long period fibre gratings (HLPFGs) are inscribed in different types of small-core single mode fibre (SMF) by use of hydrogen-oxygen flame heating technique. A detailed investigation of the effect of core diameter on their transmission spectrum and optimum length of the HLPFG has been pursued. A longer length is required to achieve the same coupling attenuation in a smaller-core SMF than that of a larger-core fibre. The strain, torsion and refractive index (RI) properties of the HLPFG is investigated experimentally to develop a high-sensitivity sensor. The experimental results show that the strain sensitivity could be enhanced by means of employing a larger-core diameter SMF. Moreover, the HLFPGs are also sensitive to the torsion and external RI. Hence, such HLFPGs have great potential for sensing applications.

scholarly journals Simultaneous Measurement of Temperature and Refractive Index Using High Temperature Resistant Pure Quartz Grating Based on Femtosecond Laser and HF Etching

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 1028
Author(s):  
Na Zhao ◽  
Qijing Lin ◽  
Kun Yao ◽  
Fuzheng Zhang ◽  
Bian Tian ◽  
...  
Keyword(s):  
Refractive Index ◽  
High Temperature ◽  
Femtosecond Laser ◽  
Optical Fiber ◽  
Temperature Response ◽  
High Sensitivity ◽  
Xrd Analysis ◽  
Refractive Index Sensor ◽  
Compact Structure ◽  
Fluid Analysis

The optical fiber temperature and refractive index sensor combined with the hollow needle structure for medical treatment can promote the standardization of traditional acupuncture techniques and improve the accuracy of body fluid analysis. A double-parameter sensor based on fiber Bragg grating (FBG) is developed in this paper. The sensor materials are selected through X-ray diffraction (XRD) analysis, and the sensor sensing principle is theoretically analyzed and simulated. Through femtosecond laser writing pure silica fiber, a high temperature resistant wavelength type FBG temperature sensor is obtained, and the FBG is corroded by hydrofluoric acid (HF) to realize a high-sensitivity intensity-type refractive index sensor. Because the light has dual characteristics of energy and wavelength, the sensor can realize simultaneous dual-parameter sensing. The light from the lead-in optical fiber is transmitted to the sensor and affected by temperature and refractive-index; then, the reflection peak is reflected back to the lead-out fiber by the FBG. The high temperature response and the refractive index response of the sensor were measured in the laboratory, and the high temperature characteristics of the sensor were verified in the accredited institute. It is demonstrated that the proposed sensor can achieve temperature sensing up to 1150 °C with the sensitivity of 0.0134 nm/°C, and refractive sensing over a refractive range of 1.333 to 1.4027 with the sensitivity of −49.044 dBm/RIU. The sensor features the advantages of two-parameter measurement, compact structure, and wide temperature range, and it exhibits great potential in acupuncture treatment.

Development of an Optical Fiber Sensor with a D-shaped Fiber Bragg Grating Integrated in a Loop-mirror Optical Fiber Laser as a High Sensitivity Refractometer

2021 ◽  
Vol 32 ◽  
Author(s):  
Binh Pham Thanh ◽  
Thuy Van Nguyen ◽  
Van Hoi Pham ◽  
Huy Bui ◽  
Thi Hong Cam Hoang ◽  
...  
Keyword(s):  
Refractive Index ◽  
Optical Fiber ◽  
Fiber Laser ◽  
Fiber Bragg Grating ◽  
Limit Of Detection ◽  
Optical Fiber Sensor ◽  
High Sensitivity ◽  
Optical Signal ◽  
Bragg Grating ◽  
Loop Mirror

In this paper, we report a new type of refractometer based on a D-shaped fiber Bragg grating (FBG) integrated in a loop-mirror optical fiber laser. This proposed sensor is used in wavelength interrogation method, in which the D-shaped FBG is applied as a refractive index (RI) sensing probe and a mirror to select mode of laser. The D-shaped FBG is prepared by the removal of a portion of the fiber cladding covering the FBG by means of side-polishing technique. The D-shaped FBG sensing probe integrated in a loop-mirror optical fiber laser with saturated pump technique, the characteristics of sensing signals have been improved to obtain stable intensity, narrower bandwidth and higher optical signal-to-noise ratio compare to normal reflection configuration. The limit of detection (LOD) of this sensor can be achieved to 2.95 x 10-4 RIU in the refractive index (RI) range of 1.42-1.44. Accordingly, we believe that the proposed refractometer has a huge potential for applications in biochemical-sensing technique.

Temperature Dependence of a Refractive Index Sensor Based on Side-Polished Macrobending Plastic Optical Fiber

2016 ◽  
Vol 16 (2) ◽  
pp. 355-358 ◽  
Author(s):  
Ning Jing ◽  
Chuanxin Teng ◽  
Fangda Yu ◽  
Guanjun Wang ◽  
Jie Zheng
Keyword(s):  
Refractive Index ◽  
Optical Fiber ◽  
Temperature Dependence ◽  
Refractive Index Sensor ◽  
Plastic Optical Fiber

Plastic Optical Fiber Sensor for Detection of Ethanol Concentrations

2020 ◽  
Vol 307 ◽  
pp. 84-89
Author(s):  
Aisyah Hanim Surani ◽  
Affa Rozana Abdul Rashid ◽  
N. Arsad ◽  
Amna Afiqah Nasution Hakim
Keyword(s):  
Optical Fiber ◽  
Evanescent Wave ◽  
Optical Fiber Sensor ◽  
High Sensitivity ◽  
Deionized Water ◽  
Plastic Optical Fiber ◽  
Polymer Optical Fiber ◽  
Ethanol Sensor ◽  
Output Ratio ◽  
Higher Sensitivity

An optimized study of tapered polymer optical fiber (POF) for measurement of different concentration of ethanol in deionized water (0.5%-3.5%) is proposed and demonstrated. This sensor operated based on evanescent wave absorption principle. The cladding of PMMA based POF is removed using organic solvents which can be used to create tapered POF. The unclad length around 1 cm and 3 cm as well as the waist diameters of POF in the range of 5 mm and 8 mm were compared for their efficiency as an ethanol sensor based on power output ratio values. Tapered POF with smaller waist diameter and longer tapered length showed higher sensitivity as ethanol sensor. Therefore, by tailoring the length and tapered diameter of POF, high sensitivity of ethanol sensor can be fabricated.

High-Sensitivity Refractive Index Sensors Using Coherent Perfect Absorption on Graphene in the Vis-NIR Region

2019 ◽  
Vol 2 (5) ◽  
pp. 3231-3237 ◽  
Author(s):  
Chawei Li ◽  
Jinlin Qiu ◽  
Jun-Yu Ou ◽  
Qing Huo Liu ◽  
Jinfeng Zhu
Keyword(s):  
Refractive Index ◽  
High Sensitivity ◽  
Perfect Absorption ◽  
Coherent Perfect Absorption ◽  
Refractive Index Sensors

High-Bandwidth Plastic Optical Fiber With W-Refractive Index Profile

2004 ◽  
Vol 16 (9) ◽  
pp. 2081-2083 ◽  
Author(s):  
T. Ishigure ◽  
H. Endo ◽  
K. Ohdoko ◽  
Y. Koike
Keyword(s):  
Refractive Index ◽  
Optical Fiber ◽  
Refractive Index Profile ◽  
Plastic Optical Fiber ◽  
Index Profile ◽  
High Bandwidth
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