scholarly journals High temperature high sensitivity optical fibre sensor based on multimode fibre Bragg grating

2018 ◽  
Vol 13 (11) ◽  
pp. 1537-1541
Author(s):  
Qijing Lin ◽  
Na Zhao ◽  
Weile Jiang ◽  
Kun Yao ◽  
Bian Tian ◽  
...  
Keyword(s):  
High Temperature ◽  
Optical Fibre ◽  
High Sensitivity ◽  
Bragg Grating ◽  
Fibre Bragg Grating ◽  
Optical Fibre Sensor ◽  
Fibre Sensor

scholarly journals Stretchable optical fibre sensor for soft surgical robot shape reconstruction

2021 ◽  
Vol 51 (4) ◽  
Author(s):  
Yanlin He ◽  
Likun Gao ◽  
Yuchen Bai ◽  
Hangwei Zhu ◽  
Guangkai Sun ◽  
...  
Keyword(s):  
Optical Fibre ◽  
Soft Materials ◽  
Maximum Error ◽  
Shape Reconstruction ◽  
Fibre Bragg Grating ◽  
Soft Robot ◽  
Soft Robots ◽  
Optical Fibre Sensor ◽  
Fibre Sensor ◽  
Shape Sensing

Soft robotics presents several advantages in the field of minimally invasive surgery. However, existing methods have not fully addressed problems related to soft robot shape sensing due to the complex motion of soft robots and the stretchable nature of the soft materials employed. This study demonstrates the shape sensing of a soft robot with a helically embedded stretchable fibre Bragg grating (FBG)-based optical fibre sensor. Unlike straight FBG embedding configurations, this unique helical configuration prevents sensor dislocation, supports material stretchability, and facilitates shape detection for various soft-robot movements. The proposed soft-robot design principle and FBG sensor are analysed and their fabrication process, which includes an FBG-written optical fibre sensor, is described. Bending experiments are conducted with the soft robot, the wavelengths of FBG sensors at different bending and telescopic movement states are obtained, and the soft-robot shape is reconstructed. Experimental results demonstrate that the maximum error between FBG sensing and the actual bending state is less than 2.5%, validating the feasibility and effectiveness of the proposed helical stretchable FBG sensing method for the shape measurement of soft robots. These results indicate the potential and applicability of this shape-sensing approach in biomedical research.

scholarly journals Simultaneous Vector Bend and Temperature Sensing Based on a Polymer and Silica Optical Fibre Grating Pair

Sensors ◽  
2018 ◽  
Vol 18 (10) ◽  
pp. 3507 ◽  
Author(s):  
Binbin Yan ◽  
Guoqiang Liu ◽  
Jun He ◽  
Yanhua Luo ◽  
Liwei Yang ◽  
...  
Keyword(s):  
Optical Fibre ◽  
Temperature Sensitivity ◽  
High Sensitivity ◽  
Temperature Sensing ◽  
Bragg Grating ◽  
Fibre Bragg Grating ◽  
Temperature Changes ◽  
The Difference ◽  
Grating Pair ◽  
Bending Response

The bending response of polymer optical fibre Bragg grating (POFBG) and silica optical fibre Bragg grating (SOFBG) mounted on a brass beam have been systematically studied and compared. The results indicate that POFBG has higher (almost twice as much) bend sensitivity than SOFBG. Based on the difference between the bend and temperature sensitivity of POFBG and SOFBG, a new method of measuring vector bend and temperature simultaneously was proposed by using a hybrid sensor head with series connection of one POFBG and one SOFBG with different Bragg wavelengths. It provides high sensitivity and resolution for sensing bend and temperature changes simultaneously and independently. The proposed sensor can find some applications in the fields where high sensitivity for both bend and temperature measurements are required.

scholarly journals Optical Fibre Sensor for Capillary Refill Time and Contact Pressure Measurements under the Foot

Sensors ◽  
2021 ◽  
Vol 21 (18) ◽  
pp. 6072
Author(s):  
Hattan K. Ballaji ◽  
Ricardo Correia ◽  
Chong Liu ◽  
Serhiy Korposh ◽  
Barrie R. Hayes-Gill ◽  
...  
Keyword(s):  
Contact Pressure ◽  
Blood Volume ◽  
Optical Fibre ◽  
Fibre Bragg Grating ◽  
Capillary Refill Time ◽  
Volume Changes ◽  
Capillary Refill ◽  
Optical Fibre Sensor ◽  
Skin Contact ◽  
Fibre Sensor

Capillary refill time (CRT) refers to the time taken for body tissue to regain its colour after an applied blanching pressure is released. Usually, pressure is manually applied and not measured. Upon release of pressure, simple mental counting is typically used to estimate how long it takes for the skin to regain its colour. However, this method is subjective and can provide inaccurate readings due to human error. CRT is often used to assess shock and hydration but also has the potential to assess peripheral arterial disease which can result in tissue breakdown, foot ulcers and ultimately amputation, especially in people with diabetes. The aim of this study was to design an optical fibre sensor to simultaneously detect blood volume changes and the contact pressure applied to the foot. The CRT probe combines two sensors: a plastic optical fibre (POF) based on photoplethysmography (PPG) to measure blood volume changes and a fibre Bragg grating to measure skin contact pressure. The results from 10 healthy volunteers demonstrate that the blanching pressure on the subject’s first metatarsal head of the foot was 100.8 ± 4.8 kPa (mean and standard deviation), the average CRT was 1.37 ± 0.46 s and the time to achieve a stable blood volume was 4.77 ± 1.57 s. For individual volunteers, the fastest CRT measured was 0.82 ± 0.11 and the slowest 1.94 ± 0.49 s. The combined sensor and curve fitting process has the potential to provide increased reliability and accuracy for CRT measurement of the foot in diabetic foot ulcer clinics and in the community.

scholarly journals Optical fibre Sensor for Simultaneous Temperature and Relative Humidity Measurement: Towards Absolute Humidity Evaluation

2021 ◽  
pp. 130154
Author(s):  
Chenyang He ◽  
Serhiy Korposh ◽  
Ricardo Correia ◽  
Liangliang Liu ◽  
Barrie R. Hayes-Gill ◽  
...  
Keyword(s):  
Relative Humidity ◽  
Optical Fibre ◽  
Absolute Humidity ◽  
Humidity Measurement ◽  
Optical Fibre Sensor ◽  
Fibre Sensor

scholarly journals Surface polymer imprinted optical fibre sensor for dose detection of dabrafenib

The Analyst ◽  
2020 ◽  
Vol 145 (13) ◽  
pp. 4504-4511 ◽  
Author(s):  
Chenyang He ◽  
Ulises Hernandez Ledezma ◽  
Pratik Gurnani ◽  
Thais Albelha ◽  
Kristofer J. Thurecht ◽  
...  
Keyword(s):  
Optical Fibre ◽  
Cancer Drugs ◽  
Optical Fibre Sensor ◽  
Anti Cancer ◽  
Fibre Sensor ◽  
New Generation

Dabrafenib is one of the most widely used of the new generation of targeted anti-cancer drugs.

Flow cell with hybrid LPG and FBG optical fibre sensor for refractometric measurements

2011 ◽  
Author(s):  
F. Baldini ◽  
M. Brenci ◽  
F. Chiavaioli ◽  
R. Falciai ◽  
C. Trono
Keyword(s):  
Optical Fibre ◽  
Flow Cell ◽  
Optical Fibre Sensor ◽  
Fibre Sensor
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