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The following topics are dealt with: sensors; image processing; measurements; transducers; calibration; noninvasive measurements; inverse problems; telecommunications; measurement uncertainty; digital signal processing; automated test systems; diagnostics systems; sensor networks; analog signals; mixed signals; soft computing; analog conversion; digital conversion; mathematical modeling; and sensor...
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Our beautifully conceived International System of Units (S.I.) has undergone many changes since its inception, but always subject to the requirement that the measured value of any unchanging quantity such as a physical constant, shall remain unaltered. The uncertainty of these values has, however, decreased by a thousand times or more and the reproducibility and coherence of the S.I. must keep ahead...
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A novel, simple and high accuracy dual slope direct digital converter suitable for differential capacitive sensors is presented in this work. The proposed technique provides a linear digital output proportional to the parameter being sensed by differential capacitive sensors irrespective of the fact that the sensor could possess either a linear or an inverse characteristic. In the proposed technique,...
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In this paper, a cylindrical capacitance sensor with a multi-layer structure was presented. The mathematical model in stratified flow was established and the sensor response in non-stratified flow was also discussed. Results of static experiments agreed well with the stratified model and showed a monotonic relationship between the sensor response and the water holdup. Dynamic experiments were carried...
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This paper proposes a simple and low-cost interface circuit for capacitive sensors that is insensitive to the parasitic conductance (Gx) of the sensor. Such a circuit relies on a previous circuit also proposed by the authors, in which the sensor is directly connected to a microcontroller without using analog circuitry between them. The novel circuit uses the same hardware, but it performs an additional...
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This paper presents a simple yet efficient proximity sensor obtained by combining inductive and capacitive sensing principles. Capacitive proximity sensors based on shielding of electric field are known for detecting presence of humans in its vicinity. Such systems may fail to distinguish the proximity of a human from grounded conductive objects. A novel, cost effective, sensing scheme that uses a...
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A geometric method of bubble volume computing based on 2-D high-speed image were introduced in this paper. An ellipsoid was constructed with three semi-axis extracted from bubble image. The volume of ellipsoid is approximately equal to the size of bubble. Correction methods are also described for error reducing. The feasibility and universal applicability of the geometric method have been verified...
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In this study, we propose a method to estimate 3D shape, color and specular reflections of an object using an image scanner with multiple illuminations. In the first process, we estimate an initial shape of the object. Several scanned images taken by illuminations located on the circumference are used to estimate object shape by the photometric stereo using average images reducing the specular reflection...
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Partial occlusion is a difficult problem in computer vision since whether the object is changed or occluded is ambiguous, especially when distinguishing it only from the object boundary. In this paper, we proposed a novel idea to solve this problem by taking shape matching as a morphing processing. A mass-spring model is constructed from the point set which is sampled from a template (or reference)...
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Sensing reliability is an important issue in wireless sensor networks because of the generally existing failures of sensor nodes. In this paper, we design a reputation-based method to assure sensing reliability for acoustic target location estimation. Sensor reputation is defined here as the probability that a node's measurement is trustable, i.e., reputation actually represents the sensing reliability...
