Wave separation and pipeline condition assessment using in-pipe fibre optic pressure sensors

2019 ◽  
Vol 21 (2) ◽  
pp. 371-379 ◽  
Author(s):  
He Shi ◽  
Jinzhe Gong ◽  
Peter R. Cook ◽  
John W. Arkwright ◽  
Gretel M. Png ◽  
...  
Keyword(s):  
Pressure Measurement ◽  
Sensor Array ◽  
Pressure Sensors ◽  
Condition Assessment ◽  
Pressure Waves ◽  
Fibre Optic ◽  
Transient Pressure ◽  
Water Pipes ◽  
Wave Separation ◽  
Close Proximity

Abstract The use of two pressure transducers in close proximity can enable the separation of the directional travelling pressure waves in pipelines. However, the implementation of this measurement strategy in real water pipes is difficult due to the lack of closely located access points. This paper reports the use of a customised in-pipe fibre optic pressure sensor array for hydraulic transient wave separation and pipeline condition assessment. The fibre optic pressure sensor array can be inserted into a pressurised pipeline through a single access point. The array consists of multiple fibre Bragg grating (FBG)-based pressure sensors in close proximity (∼0.5 m apart). A previously developed wave separation algorithm is adapted to analyse the transient pressure measurement from the FBG sensors. The resultant directional pressure waves are then used to detect pipe sections with a thinner wall thickness. A challenge is the influence of the in-pipe fibre optic sensing cable on the transient pressure measurement. The impact is analysed and adjustments to the pipeline condition assessment algorithm are undertaken to resolve the issue. The successful experimental application verifies the usefulness of the in-pipe fibre optic sensor array, which can facilitate transient-based pipeline condition assessment for buried water pipes with limited access points.

scholarly journals Hydraulic transient wave separation algorithm using a dual-sensor with applications to pipeline condition assessment

2017 ◽  
Vol 19 (5) ◽  
pp. 752-765 ◽  
Author(s):  
He Shi ◽  
Jinzhe Gong ◽  
Aaron C. Zecchin ◽  
Martin F. Lambert ◽  
Angus R. Simpson
Keyword(s):  
Travelling Waves ◽  
Pressure Sensors ◽  
Condition Assessment ◽  
Separation Algorithm ◽  
Transient Wave ◽  
Hydraulic Transient ◽  
Measurement Site ◽  
Wave Separation ◽  
Detection Analysis ◽  
Dual Sensor

Over the past two decades, techniques have been developed for pipeline leak detection and condition assessment using hydraulic transient waves (i.e. water hammer waves). A common measurement strategy for applications involves analysis of signals from a single pressure sensor located at each measurement site. The measured pressure trace from a single sensor is a superposition of reflections coming from upstream, and downstream, of the sensor. This superposition brings complexities for signal processing applications for fault detection analysis. This paper presents a wave separation algorithm, accounting for transmission dynamics, which enables the extraction of directional travelling waves by using two closely placed pressure sensors at one measurement site (referred to as a dual-sensor). Two typical transient incident pressure waves, a pulse wave and a step wave, are investigated in numerical simulations and laboratory experiments. Comparison of the wave separation results with their predicted counterparts shows the wave separation algorithm is successful. The results also show that the proposed wave separation technique facilitates transient-based pipeline condition assessment.

Development of circuit solution and design of capacitive pressure sensor array for applied robotics

2020 ◽  
Vol 8 (4) ◽  
pp. 296-307
Author(s):  
Konstantin Krestovnikov ◽  
Aleksei Erashov ◽  
Аleksandr Bykov
Keyword(s):  
Pressure Sensor ◽  
Output Signal ◽  
Sensor Array ◽  
Applied Pressure ◽  
Pressure Sensors ◽  
Fine Tuning ◽  
Capacitive Pressure Sensor ◽  
Cell Parameters ◽  
Linear Pattern ◽  
Sensor Structure

This paper presents development of pressure sensor array with capacitance-type unit sensors, with scalable number of cells. Different assemblies of unit pressure sensors and their arrays were considered, their characteristics and fabrication methods were investigated. The structure of primary pressure transducer (PPT) array was presented; its operating principle of array was illustrated, calculated reference ratios were derived. The interface circuit, allowing to transform the changes in the primary transducer capacitance into voltage level variations, was proposed. A prototype sensor was implemented; the dependency of output signal power from the applied force was empirically obtained. In the range under 30 N it exhibited a linear pattern. The sensitivity of the array cells to the applied pressure is in the range 134.56..160.35. The measured drift of the output signals from the array cells after 10,000 loading cycles was 1.39%. For developed prototype of the pressure sensor array, based on the experimental data, the average signal-to-noise ratio over the cells was calculated, and equaled 63.47 dB. The proposed prototype was fabricated of easily available materials. It is relatively inexpensive and requires no fine-tuning of each individual cell. Capacitance-type operation type, compared to piezoresistive one, ensures greater stability of the output signal. The scalability and adjustability of cell parameters are achieved with layered sensor structure. The pressure sensor array, presented in this paper, can be utilized in various robotic systems.

Development Of PVDF Thick Film Interdigitated Capacitors For Pressure Measurement On Flexible Melinex Substrates

2005 ◽  
Vol 870 ◽  
Author(s):  
Arous Arshak ◽  
Khalil Arshak ◽  
Deirdre Morris ◽  
Olga Korostynska ◽  
Essa Jafer
Keyword(s):  
Polymer Film ◽  
Thick Film ◽  
Pressure Measurement ◽  
Pressure Sensors ◽  
High Sensitivity ◽  
Strain Gauges ◽  
Interdigitated Electrodes ◽  
Higher Sensitivity

AbstractIn this work, a PVDF thick film paste was deposited onto interdigitated electrodes to form a capacitor. Two different substrates, alumina and Melinex® were used. Capacitors, fabricated on alumina substrates were tested as strain gauges, and showed a high sensitivity with low hysteresis. Capacitors on Melinex® substrates were tested as pressure sensors by adhering them to planar and cylindrical surfaces and subjecting them to pressures up to 300 kPa. Their sensitivity and hysteresis during cycling were examined and compared. It was found that sensors on cylindrical surfaces showed a higher sensitivity, however the hysteresis was also increased. It is thought that this is due to instabilities in the polymer film, accentuated by stretching of the substrate.

Study on connecting tube dynamics for transient pressure measurement

Sadhana ◽  
2020 ◽  
Vol 45 (1) ◽  
Author(s):  
H YADAV ◽  
A VENUGOPAL ◽  
S V PRABHU ◽  
AMIT AGRAWAL
Keyword(s):  
Pressure Measurement ◽  
Transient Pressure

scholarly journals Design, Manufacture and Testing of Capacitive Pressure Sensors for Low-Pressure Measurement Ranges

Micromachines ◽  
2017 ◽  
Vol 8 (2) ◽  
pp. 41 ◽  
Author(s):  
Vasileios Mitrakos ◽  
Lisa Macintyre ◽  
Fiona Denison ◽  
Philip Hands ◽  
Marc Desmulliez
Keyword(s):  
Pressure Measurement ◽  
Pressure Sensors ◽  
Low Pressure

Underwater pressure measurement using fibre optic extrinsic Fabry-Perot interferometric (EFPI) sensors

2014 ◽  
Author(s):  
Dinesh Babu Duraibabu ◽  
Sven Poeggel ◽  
Elfed Lewis ◽  
Thomas Newe
Keyword(s):  
Pressure Measurement ◽  
Fibre Optic ◽  
Fabry Perot

Leaking Detector Based on DSP

2014 ◽  
Vol 644-650 ◽  
pp. 1189-1192
Author(s):  
Lu Zhang
Keyword(s):  
Pressure Sensors ◽  
Water Pipe ◽  
Water Pipes ◽  
Exact Location ◽  
Relative Information ◽  
Two Sides ◽  
Physical Verification

The leaking of water pipes will not only waste a large amount of water but also cause great economical damage. This paper is about the research on the leaking detector based on DSP. At first, the leaking detector can collect sound signals that flow two sides by pressure sensors fixed at the two sides of the water pipes, then it will enlarge and remove the noise of the collected sound signals. At last, with the assistance of relative information about signals, it can find out the exact leaking position. Having passed physical verification, this leaking detector can figure out the exact location of water pipe leaking.

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