High-sensitivity dynamic distributed pressure sensing with frequency-scanning φ-OTDR

2021 ◽  
Author(s):  
Liqiang Qiu ◽  
Dexin Ba ◽  
Dengwang Zhou ◽  
Qi Chu ◽  
Zongda Zhu ◽  
...  
Keyword(s):  
High Sensitivity ◽  
Pressure Sensing ◽  
Frequency Scanning ◽  
Distributed Pressure

scholarly journals Fully distributed pressure sensing with ultra-high-sensitivity using side-hole fibers

2018 ◽  
Author(s):  
Li Zhang ◽  
Zhisheng Yang ◽  
Łukasz Szostkiewicz ◽  
Krzysztof Markiewicz ◽  
Tomasz Nasilowski ◽  
...  
Keyword(s):  
High Sensitivity ◽  
Pressure Sensing ◽  
Side Hole ◽  
Distributed Pressure

Simulation of Water Distribution Systems with Breaks

2012 ◽  
Vol 170-173 ◽  
pp. 2348-2351
Author(s):  
Di Xiao ◽  
Jian Wen Liang ◽  
Xin Hua Zhao
Keyword(s):  
Distribution Systems ◽  
Water Distribution ◽  
Water Distribution Systems ◽  
High Sensitivity ◽  
Pressure Variation ◽  
Numerical Examples ◽  
Supply Pressure ◽  
Distributed Pressure ◽  
Monitoring Stations

This paper presents a method for simulation of water distribution systems with breaks, in which, the leakage and low supply pressure can be considered. The effects of break location and extent on pressure variation of monitoring stations are simulated by numerical examples. It is shown that, the method can be used for estimating the effected area due to breaks; the high sensitivity may be achieved if monitoring stations are uniformly distributed; pressure variations are linear for small breaks and nonlinear for large ones.

scholarly journals Flexible Distributed Pressure Sensing Strip for a Urethral Catheter

2015 ◽  
Vol 24 (6) ◽  
pp. 1840-1847 ◽  
Author(s):  
Mahdi Ahmadi ◽  
Rajesh Rajamani ◽  
Gerald Timm ◽  
A. Serdar Sezen
Keyword(s):  
Urethral Catheter ◽  
Pressure Sensing ◽  
Distributed Pressure

scholarly journals High-Performance Resistive Pressure Sensor Based on Elastic Composite Hydrogel of Silver Nanowires and Poly(ethylene glycol)

Micromachines ◽  
2018 ◽  
Vol 9 (9) ◽  
pp. 438 ◽  
Author(s):  
Youngsang Ko ◽  
Dabum Kim ◽  
Goomin Kwon ◽  
Jungmok You
Keyword(s):  
Composite Material ◽  
Ethylene Glycol ◽  
Pressure Sensor ◽  
High Performance ◽  
Silver Nanowires ◽  
High Sensitivity ◽  
Composite Hydrogel ◽  
Poly Ethylene Glycol ◽  
Pressure Sensing ◽  
Poly Ethylene

Improved pressure sensing is of great interest to enable the next-generation of bioelectronics systems. This paper describes the development of a transparent, flexible, highly sensitive pressure sensor, having a composite sandwich structure of elastic silver nanowires (AgNWs) and poly(ethylene glycol) (PEG). A simple PEG photolithography was employed to construct elastic AgNW-PEG composite patterns on flexible polyethylene terephthalate (PET) film. A porous PEG hydrogel structure enabled the use of conductive AgNW patterns while maintaining the elasticity of the composite material, features that are both essential for high-performance pressure sensing. The transparency and electrical properties of AgNW-PEG composite could be precisely controlled by varying the AgNW concentration. An elastic AgNW-PEG composite hydrogel with 0.6 wt % AgNW concentration exhibited high transmittance including T550nm of around 86%, low sheet resistance of 22.69 Ω·sq−1, and excellent bending durability (only 5.8% resistance increase under bending to 10 mm radius). A flexible resistive pressure sensor based on our highly transparent AgNW-PEG composite showed stable and reproducible response, high sensitivity (69.7 kPa−1), low sensing threshold (~2 kPa), and fast response time (20–40 ms), demonstrating the effectiveness of the AgNW-PEG composite material as an elastic conductor.

A Flexible Tactile Sensor Based on Porous Graphene Sponge for Tiny Force Measurement

2018 ◽  
Author(s):  
Lingfeng Zhu ◽  
Yancheng Wang ◽  
Xin Wu ◽  
Deqing Mei
Keyword(s):  
Force Measurement ◽  
High Sensitivity ◽  
Tactile Sensor ◽  
Tactile Sensors ◽  
Force Detection ◽  
Pressure Sensing ◽  
Porous Graphene ◽  
Graphene Sponge ◽  
Healthcare Monitoring ◽  
Working Principle

Flexible tactile sensors have been utilized for epidermal pressure sensing, motion detecting, and healthcare monitoring in robotic and biomedical applications. This paper develops a novel piezoresistive flexible tactile sensor based on porous graphene sponges. The structural design, working principle, and fabrication method of the tactile sensor are presented. The developed tactile sensor has 3 × 3 sensing units and has a spatial resolution of 3.5 mm. Then, experimental setup and characterization of this tactile sensor are conducted. Results indicated that the developed flexible tactile sensor has good linearity and features two sensitivities of 2.08 V/N and 0.68 V/N. The high sensitivity can be used for tiny force detection. Human body wearing experiments demonstrated that this sensor can be used for distributed force sensing when the hand stretches and clenches. Thus the developed tactile sensor may have great potential in the applications of intelligent robotics and healthcare monitoring.

scholarly journals Distributed Pressure Sensing Using Carbon Nanotube Fabrics

2016 ◽  
Vol 16 (12) ◽  
pp. 4663-4664 ◽  
Author(s):  
Long Wang ◽  
Sumit Gupta ◽  
Kenneth J. Loh ◽  
Helen S. Koo
Keyword(s):  
Carbon Nanotube ◽  
Pressure Sensing ◽  
Distributed Pressure

scholarly journals Experimental pressure sensing and technology of piezoelectric microwave/RF MEMS filters

2011 ◽  
Vol 3 (5) ◽  
pp. 587-593 ◽  
Author(s):  
Alessandro Massaro ◽  
Giuseppe Venanzoni ◽  
Marco Farina ◽  
Antonio Morini ◽  
Tullio Rozzi ◽  
...  
Keyword(s):  
Rf Mems ◽  
Three Dimensional ◽  
High Sensitivity ◽  
Experimental Characterization ◽  
Pressure Sensing ◽  
Rf Filter ◽  
Simple Technology ◽  
3D Finite Element Method ◽  
Experimental Pressure ◽  
Mems Filter

In this work, we analyze the pressure sensing of a thin film molybdenum/aluminumnitride/molybdenum (Mo/AlN/Mo) microwave/RF MEMS filter fabricated by a simple technology. After an experimental characterization in a frequency range between 1 and 36 GHz, we focused on the piezoelectric effect due to the stress properties of the piezoelectric AlN layer by applying forces by means of weights. Variations in the bandpass region of the microwave/RF filter are observed by proving high sensitivity also for low applied weights. We check by a properly designed three-dimensional (3D) finite-element method (FEM) tool the pressure-sensing property of the proposed device. Finally, we analyze the bad gap property of a chip with central defect around 40 GHz.

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