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Measurement
Elsevier BV
Measurement

Elsevier BV

0263-2241

Measurement/Journal MeasurementISTPSCIAHCI
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    Thermally compensated inductive deformation sensor – Mathematical background and practical implementation

    Nurkowski J.Nowakowski A.
    12页
    查看更多>>摘要：? 2022 The Author(s)The article presents theoretical background and experimental verification of thermal compensation method of inductive displacement sensor. This sensor has the form of single-layer, coreless coil which is the inductance of a resonant LC circuit. Change of coil length causes change in oscillation frequency of Colpitts oscillator. Influence of the sensor temperature on the circuit oscillation frequency was significantly reduced. This was achieved by using the dependence of the sensor resistance on its temperature in a specially modified resonant circuit. The circuit was mathematically modeled. The detectors were made of various metals and their theoretical thermal characteristics were compared with the experimental ones. The sensor has successfully been used for years in rock samples’ deformations measurements during the compressibility test, at hydrostatic pressure up to 400 MPa with temperature changes of several dozen degrees. It replaced resistance strain gauges and LVDT sensors, that were unreliable at high pressures.
      原文链接:
    • NSTL
    • Elsevier

    The influence of the viscosity of crude oil on liquid-dynamic noise characteristics in the volute shell of oil transfer pump

    Liu Z.Zou L.Qiao J.Shi C....
    9页
    查看更多>>摘要：? 2022 The Author(s)This paper aims to study the influence of the viscosity of crude oil on the liquid-dynamic noise characteristics using ANSYS Fluent. The RNG k-? model is used for simulating the static pressure distribution characteristics of crude oil in the centrifugal pump. The LES S-L model is used for simulating the transient characteristics of crude oil in the centrifugal pump. The results show that the viscosity of crude oil is the primary factor affecting the static pressure distribution and the transient characteristics of crude oil in the centrifugal pump. The lower the viscosity of the crude oil is, the greater the change in static pressure is. The maximum static pressure peak appears nearby the tongue of oil transfer pump. The static pressure critical viscosity affecting the inner wall of the volute shell is 1728mPa.s. According to the viscosity test data provided by related literature, A 3-step mathematical characterization model is proposed to describe the relationship between the viscosity and the corresponding water content of crude oil. It can be used to compute the crude oil viscosity parameter as a given value in ANSYS Fluent program. The maximum relative deviation is 2.62%. A transmit method is proposed by heating up the pre-stable and post-stable crude oil twice to keep the viscosity constant in the whole progress of crude oil transmit. It will be beneficial to energy saving.
      原文链接:
    • NSTL
    • Elsevier

    Efficient residual reliability criterion index in a permanent guided wave monitoring system

    Kong Chen Y.Bakhary N.Padil K.H.Fairuz Shamsudin M....
    14页
    查看更多>>摘要：? 2022 Elsevier LtdThe permanent guided ultrasonic wave monitoring system has been increasingly applied in pipeline condition monitoring, as it provides reliable and accurate pipeline damage information. However, environmental and operational conditions (EOCs) arise due to variations in external factors such as temperature variations, humidity, air pressure and random noise. Such conditions may jeopardise the quality of damage detection results. Small damage such as cracks often underlies within the EOC effect and goes undetected. In this paper, a new damage features extraction method based on the residual reliability criterion (RRC) is proposed, and the superiority of the RRC in small damage identification is demonstrated. Four damage detection schemes are compared using the established receiver operating characteristics (ROC) performance evaluation method. The GUW database is obtained from numerical modelling and an experiment verification model. The results show that the RRC method performs significantly better than the other three damage detection schemes under EOC effects.
      原文链接:
    • NSTL
    • Elsevier

    A practical and general methodology for efficiency calibration of coaxial Ge detectors

    Barba-Lobo A.Bolivar J.P.
    12页
    查看更多>>摘要：? 2022 The Author(s)The correct determination of artificial and natural radionuclides like 152Eu, 137, 134Cs, 60, 57Co, etc., and 234, 228Th, 228, 226Ra, 210Pb and 40K, respectively, is essential for many environmental science fields. For this, a general function was obtained for the full-energy peak efficiency (FEPE) by gamma-ray spectrometry using coaxial Ge detectors. Then, the experimental FEPE values, obtained fixing the energy, Eγ, were fitted varying the thickness, h, of cylindrical standards. The parameters resulted from these fittings were fitted, in turn, versus Eγ, obtaining a general efficiency function, εc (Eγ, h). εc (Eγ, h) was validated, obtaining very good zscore, except for Eγ affected by TCS effects. Consequently, a practical and general method was developed, recalibrating the detector by varying the sample-detector distance, d. εc (Eγ, h, d) was obtained, achieving very good zscore. Furthermore, this practical method was also employed to correct high self-absorptions and high dead times.
      原文链接:
    • NSTL
    • Elsevier

    HCCG: Efficient high compatibility correspondence grouping for 3D object recognition and 6D pose estimation in cluttered scenes

    Wu L.Li X.Zhong K.Li Z....
    16页
    查看更多>>摘要：? 2022 Elsevier LtdRecognizing and localizing queried objects in point clouds is a critical technique for robotic manipulation and bin picking tasks. Even though it has been steadily studied, it is still a challenging task for scenes with heavy occlusion and clutter. To copy with this intractable problem, this paper presents a fast and robust 3D object recognition framework, especially an efficient high compatibility correspondence grouping (HCCG) technique achieved by the correspondence ranking, clustering and expanding operations. Utilizing the HCCG technique, we first cluster the compatible correspondences into several high compatibility correspondence groups. Then, for each group, a 6DoF pose hypothesis is generated by using a point pair feature constraints (PPFCs)-based outlier removal module and a local reference frame (LRF)-based pose estimation algorithm. Finally, a robust pose verification operator is carried out to reject the false positive pose hypotheses and pick up the correct target object pose. Our approach is not only suitable for the multi-object recognition task, but also inherently yields the capability of detecting multiple instances thanks to the efficient HCCG technique. Extensive experiments on four challenging datasets show that our approach yields efficient and timely solutions and its advantages are further verified by comparing with the latest methods.
      原文链接:
    • NSTL
    • Elsevier

    Continuous vertical Wheel-rail force Reconstruction method based on the distributed Acoustic sensing technology

    Gao L.Zhou C.Xiao H.Chen Z....
    17页
    查看更多>>摘要：? 2022 Elsevier LtdThe vertical wheel-rail force is a direct reflection of the interaction between the wheel and rail. The continuous vertical wheel-rail force is not only of significance for ensuring the operation safety, but also provides precious information for the structure condition assessment. However, conventional measurement methods are incapable to meet the need for real-time condition monitoring over long distances. Therefore, this paper applied a newly developed optical sensing technology, the Distributed Acoustic Sensing (DAS), to the quantitative rail strain measurement. Taking full advantage of DAS, a Bidirectional Reconstruction Method (BRM) of the continuous vertical wheel-rail forces is proposed based on the swarm intelligence algorithm. This method was applied in the Beijing Metro and verified by comparison with the conventional Shear Force Method (SFM). The results show that the proposed method can ideally reconstruct the continuous vertical wheel-rail force and has potentials for the assessment of both track and vehicle conditions.
      原文链接:
    • NSTL
    • Elsevier

    Processing TLS heterogeneous data by applying robust Msplit estimation

    Wyszkowska P.Duchnowski R.
    17页
    查看更多>>摘要：? 2022 The Author(s)Terrestrial laser scanning provides a point cloud containing hundreds or thousands of points. One should suppose that some points are mismeasured; hence, the observation set is not homogeneous, requiring the application of modern statistical methods, such as Msplit estimation. That novel method is designed for processing observation sets that are unrecognized mixtures of realizations of at least two random variables (however, a priori, there is no information on subset division). The basic Msplit estimates are not robust against outlying observations. The paper proposes new variants of Msplit estimation designed as robust against outliers. The example applications prove that the new variants are twice as accurate as of the existing Msplit estimates or four times more accurate than the conventional robust assessments. What is more, new variants can provide acceptable results even if the share of outliers exceeds 50%, which is impossible for traditional robust methods.
      原文链接:
    • NSTL
    • Elsevier

    In situ measurement of fish color based on machine vision: A case study of measuring a clownfish's color

    Nguyen C.-N.Vo V.-T.Nguyen L.-H.-N.Thai Nhan H....
    11页
    查看更多>>摘要：? 2022 Elsevier LtdThis study proposed an innovative technique to measure the fish color in situ based on machine vision to avoid potential effects on fish health that might result from conventional measurement with a colorimeter. The research goal was achieved by developing a color conversion model trained with images of a color reference target in the ambient environment and clay samples in the aquarium representing the target fish. Brightness adjustment was effectively applied to these images to minimize uneven illumination in both environments. The generalization ability of the model was ensured with regularized regression. Consequently, an optimal cubic ridge model was obtained with appreciably low training and testing mean color errors of 1.17 ± 0.64 and 1.10 ± 0.50 CIEDE2000 color difference units, respectively. Preliminary results of measuring the clownfish color showed that the proposed system had much potential for in situ and non-invasive visualizing of the color distribution of small ornamental fish with color non-uniformity.
      原文链接:
    • NSTL
    • Elsevier

    Calibration and comparison of various sensors for soil moisture measurement

    Songara J.C.Patel J.N.
    9页
    查看更多>>摘要：? 2022 Elsevier LtdThe research paper introduces the development of a soil moisture sensor in accordance with the field condition and has a capacity to measure soil moisture up to 50 cm depth. In this study, the Arduino-based soil moisture sensors such as Stainless Steel 316L grade (SS316L) probe and Copper Based Probe (CBP) are introduced, which fit best with the conventional method for measuring soil moisture. The paper also presents the calibration and performance comparison of three sensors, including SS316L and CBP sensors (developed) and Manual Soil Moisture (MSM) sensors. The globally accepted and proven Oven Dry Method (ODM) is adopted for calibration purpose during soil moisture measurement. Linear, polynomial, and logarithmic regression equations, along with Adaptive Neuro-Fuzzy Inference System (ANFIS), are utilized for the best fitting. Thus, it proves that ANFIS non-linear system gives the best result. It is observed that the SS316L sensor performs well with the desired accuracy in the given field condition compared to other soil moisture sensors. The outcome of this study will assist the government authorities, policymakers, and researchers working on water-saving objectives.
      原文链接:
    • NSTL
    • Elsevier

    Measurement methods of 3D shape of large-scale complex surfaces based on computer vision: A review

    Shang H.Liu C.Wang R.
    17页
    查看更多>>摘要：? 2022 Elsevier LtdLarge components are widely used in aerospace, shipbuilding, automobile, and other fields. The accuracy of three-dimension (3D) measurement is an important standard to measure the quality of production and assembly of the whole equipment. Due to the large-scale and difficulty in measuring complex surfaces, some optical methods for measuring 3D shapes are difficult to apply. Optical 3D shape measurement technology based on the main theoretical basis such as close-range industrial photogrammetry and stereo vision 3D shape measurement technology based on fringe structure light projection has developed rapidly. Currently, there is no review paper to comprehensively introduce these technical methods. To fill this gap and stimulate further research, we conducted a comprehensive investigation on the 3D shape measurement methods of large-scale complex surfaces, including the basic principles, application scope, measurement instruments, and systems of various methods, discussed the tasks and challenges faced by the current research, and provided potential solutions.
      原文链接:
    • NSTL
    • Elsevier