- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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[IEEE 2017 Far East NDT New Technology & Application Forum (FENDT) - Xi'an, China (2017.6.22-2017.6.24)] 2017 Far East NDT New Technology & Application Forum (FENDT) - EMD of EMAT NDT in X70 Pipeline Weld Defects
摘要： Electromagnetic acoustic transducer (EMAT) is an emerging non-destructive testing technique which has been applied to the pipelines inspection. EMAT has advantages of Non coupling agent and can be used with high temperature environment. Due to the roughness remaining in surface of the pipeline, the quantitative analysis of defect location are challenges by using EMAT NDT. This paper introduces a new detection method of EMAT by hybriding Empirical Mode Decomposition (EMD) with IMFs reconstruction to quantitative detect weld defects. The new method has been validated to detect the defects of weld for the X70 pipeline by using Bulk-wave. Experiments have been proved that it improves the accuracy of the measurement, and achieve the recognition of millimeter-level defects.
关键词： Pipeline EMAT NDT,X70 pipelines,EMD and IMFs reconstruction
更新于2025-09-23 15:23:52
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Self-synchronized Encryption for Physical Layer in 10Gbps Optical Links
摘要： in this work a new self-synchronized encryption method for 10 Gigabit optical links is proposed and developed. Necessary modifications to introduce this kind of encryption in physical layers based on 64b/66b encoding, such as 10GBase-R, have been considered. The proposed scheme encrypts directly the 64b/66b blocks by using a symmetric stream cipher based on an FPE (Format Preserving Encryption) block cipher operating in PSCFB (Pipelined Statistical Cipher Feedback) mode. One of the main novelties in this paper is the security analysis done for this mode. For the first time, an expression for the IND-CPA (Indistinguishability under Chosen-Plaintext Attack) advantage of any adversary over this scheme has been derived. Moreover, it has been concluded that this mode can be considered secure in the same way of traditional modes are. In addition, the overall system has been simulated and implemented in an FPGA (Field Programmable Gate Array). An encrypted optical link has been tested with Ethernet data frames, concluding that it is possible to cipher traffic at this level, getting maximum throughput and hiding traffic pattern from passive eavesdroppers.
关键词： self-synchronous encryption,Optical Communications,Ethernet,Pipeline Statistical Cipher Feedback
更新于2025-09-23 15:23:52
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In-situ synthesis of mullite-SiCw composite ceramics in Li2O-Al2O3-SiO2 ternary system for solar heat transmission pipeline
摘要： Nano-SiC whiskers (nano-SiCw) were in-situ synthesized in Li2O-Al2O3-SiO2 ternary system for preparing highly densified mullite-SiCw composite ceramics used for solar heat transmission pipeline. Mechanisms on the in-situ synthesis of nano-SiCw in the ternary system were investigated and the impact of nano-SiCw on the performances of the composites had been studied. Results showed that the growth processes of nano-SiC whiskers in Li2O-Al2O3-SiO2 ternary system were dominated by liquid-solid (LS) mechanism and the Li2CO3 additive could improve the SiCw yield through increasing the content of liquid phase and lowering the liquid viscosity. Sample BS3 (with 2.22 wt% Li2CO3 additive) sintered at 1440 °C obtained the highest SiC content of 47.9%. Nano-SiC whiskers with a diameter of 20e30 nm were interlocking with rod-like mullite crystals to improve the mechanical properties of the composites, and sample BS1 sintered at 1420 °C showed the highest bending strength of 115.4 MPa. The in-situ synthesized SiCw also shew significant effects on improving the thermophysical properties of the composites and sample BS1 exhibited a 3.6 times higher thermal conductivity than that of blank sample B1 without the introduction of nano-SiCw.
关键词： Li2O-Al2O3-SiO2 ternary system,Thermal conductivity,Mullite-SiCw composite ceramics,Solar heat transmission pipeline,SiC whiskers
更新于2025-09-23 15:23:52
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[IEEE 2018 International Carnahan Conference on Security Technology (ICCST) - Montreal, QC, Canada (2018.10.22-2018.10.25)] 2018 International Carnahan Conference on Security Technology (ICCST) - Reliable Leak Detection in Pipelines Using Integrated DdTS Temperature and DAS Acoustic Fiber-Optic Sensor
摘要： Reliable and early detection of leaks in pipelines transporting liquid or gas is highly desirable. In this work, two orthogonal technologies based on high-sensitivity fiber-optic distributed sensing were integrated into one system and tested for their effectiveness in actual field installations. The first technology is based on temperature difference detection using Distributed Differential Temperature Sensor (DdTS or DDTS). The second is based on Distributed Acoustic Sensor (DAS), which uses Coherent Optical Time-Domain Reflectometry (C-OTDR). DdTS can almost instantaneously detect a temperature difference in the optical fiber as low as 0.0005 οC, while C-OTDR can detect minute wide-bandwidth acoustic signals. Both technologies can detect the location of a leak to within a few meters. Experimental results for water and nitrogen gas leaks detected by the integrated system are presented for two different installations in the field – one where the cable was buried directly in the soil and another where the cable was buried in soil inside a 2” conduit for about 29 km. DdTS reliably detected leaks at both installations, while DAS detected leaks only when the cable was buried directly in soil. Test results show that the integration of both DdTS and DAS technologies can increase the probability of leak detection and minimize false/nuisance alarms. The integrated system also detected third party interference (TPI), thus providing a one-system solution for pipeline integrity monitoring and intrusion detection up to 40 km from a central location.
关键词： Oil and Gas Pipeline,DdTS,Leak Detection,Fiber Optics Sensor,DTS,TPI,DAS,C-OTDR
更新于2025-09-23 15:22:29
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Leak Detection in Water Pipes Using Submersible Optical Optic-Based Pressure Sensor
摘要： Leakage is undesirable in water distribution networks, as leaky pipes are financially costly both to water utilities and consumers. The ability to detect, locate, and quantify leaks can significantly improve the service delivered. Optical fibre sensors (OFS) have previously demonstrated their capabilities in performing real-time and continuous monitoring of pipe strength leak detection. However, the challenge remains due to the high labour cost and time-consuming process for the installation of optical fibre sensors to existing buried pipelines. The aim of this paper is to evaluate the feasibility of a submersible optical fibre-based pressure sensor that can be deployed without rigid bonding to the pipeline. This paper presents a set of experiments conducted using the proposed sensing strategy for leak detection. The calibrated optical fibre device was used to monitor the internal water pressure in a pipe with simultaneous verification from a pressure gauge. Two different pressure-based leak detection methods were explored. These leak detection methods were based on hydrostatic and pressure transient responses of the optical fibre pressure sensor. Experimental results aided in evaluating the functionality, reliability, and robustness of the submersible optical fibre pressure sensor.
关键词： pipeline,leak detection,optical fibre sensors,nondestructive technique,sensors
更新于2025-09-23 15:21:21
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Optical coherence tomography: Translation from 3D-printed vascular models of the anterior cerebral circulation to the first human images of implanted surface modified flow diverters
摘要： Background: The new generation of flow diverters includes a surface modification with a synthetic biocompatible polymer, which makes the device more biocompatible and less thrombogenic. Optical coherence tomography (OCT) can be used to visualize perforators, stent wall apposition, and intra-stent thrombus. Unfortunately real world application of this technology has been limited because of the limited navigability of these devices in the intracranial vessels. In this report, we share our experience of using 3D-printed neurovascular anatomy models to simulate and test the navigability of a commercially available OCT system and to show the application of this device in a patient treated with the new generation of surface modified flow diverters. Material and methods: Navigability of OCT catheters was tested in vitro using four different 3D-printed silicone replicas of the intracranial anterior circulation, after the implantation of surface modified devices. Intermediate catheters were used in different tortuous anatomies and positions. After this assessment, we describe the OCT image analysis of a Pipeline Shield for treating an unruptured posterior communicating artery (PCOM) aneurysm. Results: Use of intermediate catheters in the 3D-printed replicas was associated with better navigation of the OCT catheters in favorable anatomies but did not help as much in unfavorable anatomies. OCT image analysis of a PCOM aneurysm treated with Pipeline Embolization Device Shield demonstrated areas of unsatisfactory apposition with no thrombus formation. Conclusions: OCT improves the understanding of the flow diversion technology. The development of less thrombogenic devices, like the Pipeline Flex with Shield Technology, reinforces the need for intraluminal imaging for neurovascular application.
关键词： Pipeline device,Aneurysm,optical coherence tomography
更新于2025-09-23 15:21:01
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[Advances in Intelligent Systems and Computing] Image Processing and Communications Challenges 10 Volume 892 (10th International Conference, IP&C’2018 Bydgoszcz, Poland, November 2018, Proceedings) || Video Processing and Analysis for Endoscopy-Based Internal Pipeline Inspection
摘要： Because of the increasing requirements in regards to the pipeline transport regulations, the operators take care to the rigorous application of checking routines that ensure nonoccurrence of leaks and failures. In situ pipe inspection systems such as endoscopy, remains a reliable mean to diagnose possible abnormalities in the interior of a pipe such as corrosion. Through digital video processing, the acquired videos and images are analyzed and interpreted to detect the damaged and the risky pipeline areas. Thus, the objective of this work is to bring a powerful analysis tool for a rigorous pipeline inspection through the implementation of speci?c algorithms dedicated to this application for a precise delimitation of the defective zones and a reliable interpretation of the defect implicated, in spite of the drastic conditions inherent to the evolution of the endoscope inside the pipeline and the quality of the acquired images and videos.
关键词： corrosion detection,video processing,pipeline inspection,thresholding methods,endoscopy
更新于2025-09-23 15:21:01
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[IEEE 2019 International Conference on Information Science and Communications Technologies (ICISCT) - Tashkent, Uzbekistan (2019.11.4-2019.11.6)] 2019 International Conference on Information Science and Communications Technologies (ICISCT) - Evaluation of Low Cost Laser Scanner for Rapid Registration of Point Clouds with Limited Information on Rotation and Relative Location
摘要： This paper presents a 0.55 V, 7 bit, 160 MS/s pipeline ADC using dynamic amplifiers. In this ADC, high-speed open-loop dynamic amplifiers with a common-mode detection technique are used as residue amplifiers to increase the ADC's speed, to enhance the robustness against supply voltage scaling, and to realize clock-scalable power consumption. To mitigate the absolute gain constraint of the residue amplifiers in a pipeline ADC, the interpolated pipeline architecture is employed to shift the gain requirement from absolute to relative accuracy. To show the new requirements of the residue amplifiers, the effects of gain mismatch and nonlinearity of the dynamic amplifiers are analyzed. The 7 bit prototype ADC fabricated in 90 nm CMOS demonstrates an ENOB of 6.0 bits at a conversion rate of 160 MS/s with an input close to the Nyquist frequency. At this conversion rate, it consumes 2.43 mW from a 0.55 V supply. The resulting FoM of the ADC is 240 fJ/conversion-step.
关键词： ultra-low-voltage,dynamic amplifier,dual-residue,clock-scalable,charge-steering,capacitive interpolation,interpolated pipeline,Analog-to-digital converter
更新于2025-09-19 17:13:59
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[IEEE 2019 International Conference on Electromagnetics in Advanced Applications (ICEAA) - Granada, Spain (2019.9.9-2019.9.13)] 2019 International Conference on Electromagnetics in Advanced Applications (ICEAA) - A MFIE/EFIE Fast Multipole Volume/Surface Integral Equation Approach for Substrate Integrated Waveguide Structures and Leaky-Wave/Slot Antennas Using the Duality Principle
摘要： This paper presents a 0.55 V, 7 bit, 160 MS/s pipeline ADC using dynamic amplifiers. In this ADC, high-speed open-loop dynamic amplifiers with a common-mode detection technique are used as residue amplifiers to increase the ADC's speed, to enhance the robustness against supply voltage scaling, and to realize clock-scalable power consumption. To mitigate the absolute gain constraint of the residue amplifiers in a pipeline ADC, the interpolated pipeline architecture is employed to shift the gain requirement from absolute to relative accuracy. To show the new requirements of the residue amplifiers, the effects of gain mismatch and nonlinearity of the dynamic amplifiers are analyzed. The 7 bit prototype ADC fabricated in 90 nm CMOS demonstrates an ENOB of 6.0 bits at a conversion rate of 160 MS/s with an input close to the Nyquist frequency. At this conversion rate, it consumes 2.43 mW from a 0.55 V supply. The resulting FoM of the ADC is 240 fJ/conversion-step.
关键词： ultra-low-voltage,dynamic amplifier,dual-residue,clock-scalable,charge-steering,capacitive interpolation,interpolated pipeline,Analog-to-digital converter
更新于2025-09-19 17:13:59
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[IEEE 2019 14th IEEE Conference on Industrial Electronics and Applications (ICIEA) - Xi'an, China (2019.6.19-2019.6.21)] 2019 14th IEEE Conference on Industrial Electronics and Applications (ICIEA) - Real-Time 3D Profiling with RGB-D Mapping in Pipelines Using Stereo Camera Vision and Structured IR Laser Ring
摘要： This paper is focused on delivering a solution that can scan and reconstruct the 3D profile of a pipeline in real-time using a crawler robot. A structured infrared (IR) laser ring projector and a stereo camera system are used to generate the 3D profile of the pipe as the robot moves inside the pipe. The proposed stereo system does not require field calibrations and it is not affected by the lateral movement of the robot, hence capable of producing an accurate 3D map. The wavelength of the IR light source is chosen to be non overlapping with the visible spectrum of the color camera. Hence RGB color values of the depth can be obtained by projecting the 3D map into the color image frame. The proposed system is implemented in Robotic Operating System (ROS) producing real-time RGB-D maps with defects. The defect map exploit differences in ovality enabling real-time identification of structural defects such as surface corrosion in pipe infrastructure. The lab experiments showed the proposed laser profiling system can detect ovality changes of the pipe with millimeter level of accuracy and resolution.
关键词： stereo camera,3D profiling,structured IR laser,pipeline inspection,real-time mapping
更新于2025-09-12 10:27:22