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Ultrasonic testing (UT) and eddy current testing (ECT) are the effective nondestructive testing methods which are widely used in many practical fields, such as machinery, power system, airplane and petrochemical industries. Each method has its advantages and disadvantages in the practical application. We use data fusion method that is based on the Dempster-Shafer evidence theory and the fuzzy inference...
The maximum amplitude algorithm (MAA) is commonly used in the estimation of the pressure values, and it uses experimentally obtained ratios of systolic and diastolic oscillometric amplitude to the mean arterial pressure (known as systolic and diastolic ratios) for estimating the systolic and diastolic pressures. This paper provides a Bayesian approach to determine the systolic and diastolic ratios...
The defocus polar rose estimation method (POEM) is introduced here as an alternative method for defocus estimation in scanning transmission electron microscopy. Its principle of operation is discussed in detail along with the results of initial simulation-based performance tests. The results show that POEM can attain a precision similar to that of equivalent methods in the literature but using significantly...
Diversification of tests and measurements for inspecting the state of the transformer unit insulation in operation, in order to establish the maintenance optimal strategy for increasing the safety in operation of this equipment, requires new diagnosis methods and insulation condition assessment like the recovery voltage method (RVM) and the polarization and depolarization current (PDC) measurement...
This paper presents an improved interface for eddy current displacement sensor for accurate displacement measurement of thin targets in harsh environment. Two recently proposed state-of-the-art interfaces are analyzed and experimentally verified. The experimental results confirm high level of performance: displacement measurement of a 100 um thin target; displacement range ±1.5 mm; 15 bits dynamic...
This paper describes a computer added system for monitoring and control for inland and offshore drilling rig applications. LabVIEW graphic oriented software provides a flexible and reliable support for SCADA. World wide drilling is developing for oil, gas or water resources and is demanding computer added monitoring and control for correct exploitation and safe use. This applied engineering software...
Photovoltaic modules need recognized and validated measurements through appropriate certification in order to be sold and used in diverse applications. Certification process, that includes measurements and characterization, is an important aspect of photovoltaic issues. This paper presents an improved intercomparison method of characterizing Photovoltaic Modules (PVMs) in outdoor conditions and in...
Interdental contact forces are important parameters in dentistry. This paper presents an indirect method for the evaluation of contact forces as it is difficult to directly measure the contact strength on a patient. Our method is based on the measurement of forces required to insert and remove a test body into the interdental space. The proposed sensor principle allows us to perform a qualitative...
The correlated noise component of TileCal, the barrel hadronic calorimeter of the ATLAS experiment at the Large Hadron Collider, is studied and an algorithm is used to parametrize and unfold it from the response of the photomultipliers. It is shown that the correlated noise component can be significantly reduced and mostly removed not only for pedestal runs, but also in the presence of physics signals...
A method for the identification of gas-liquid two-phase flow regime in mini-pipes is proposed based on textural feature series. A high-speed image acquisition system is used to capture images of gas-liquid two-phase flow in the mini-pipe with inner diameter of 2.8mm, and five typical flow regimes (stratified flow, wavy flow, bubbly flow, slug flow and annular flow) are observed in the experiment....
This paper presents the design of the automatic system for detecting harmful gases. It uses PC, NI LabWindows/CVI, commercially available data acquisition hardware, and circuit boards specially designed for fluctuation-enhanced gas sensing. The system can not only be used for laboratory research and teaching, but also used for detecting CH4 and CO in coal mines. Our initial test results with commercial...
A novel Laser Doppler Velocimeter (LDV) has been developed, by means of an optical phase-grating. Standard LDV generates a fringes pattern by means of two laser beams, colliding at a set angle. When the speed is very high, the fringe period has to be very long, in order to avoid too high output frequencies, therefore a very low angle should be required. For the realization of such pattern we propose...
The solar photovoltaic industry has seen rapid expansion in the past decade with an ever-increasing share of the electricity-generating capacity for the world. For the emerging photovoltaic (PV) industry the assessment of the quality and reliability of its products is becoming more and more important. To this aim and to ensure an optimal design and material choice, a failure modes, effects and criticality...
One important parameter in design of Electromagnetic Tomography sensing system is the exciting frequency which determines in which kind of situation the EMT system can be applied. In this paper, Theoretical analysis is carried out to obtain the solution of the forward problem, and quantitative analysis for optimization of parameters such as frequency.
This research paper presents new technique for a crawler robot to achieve statically balanced walking. The gait design and its control of walking robot require the stability against tipping over while walking. These factors need to be treated in a more specific fashion than the wheeled robots, as there are discrete changes in the support of the robot when the legs are lifted or placed. The stability...
A method for testing the resolution of a holographic microscope with a set of in-house test targets is presented. The test targets are made of calibrated microparticles mixed in clear polyurethane medium and sealed between two glass plates. The depth range inside the target that can be imaged with adequate lateral resolution with different holographic microscope setups is demonstrated by studying...
This paper presents a NCAP embedded on DE2 kit with Nios II processor and uClinux to development of a network gateway with two interfaces, wireless (ZigBee) and wired (RS232) based on IEEE 1451. Both the communications, wireless and wired, were developed to be point-to-point and working with the same protocols, based on IEEE 1451.0–2007. The tests were made using a microcomputer, which through of...
The knowledge of the distribution system state is required to operate management and control issues, such as energy dispatching and protection coordination. The authors have proposed a novel procedure for harmonic source estimation, based on a Bayesian approach, aimed at giving distribution network operators information about the presence of harmonic producing loads, along with a key indication about...
An automated system for measuring plant leaf colour, as an indicator of plant health status, has been developed for plantlets growing in a modified micropropagation system. Using a custom built robotic arm, sensors located on a pan and tilt system at the end of the arm monitor plant growth and the ambient growing environment. Sensors include a compact colour zoom camera, RGB (red, green and blue)...
There is a lack of information on the accuracy that is required to Phasor Measurement Units (PMUs) in the measurement of synchrophasors in order to use them correctly in the different applications on power systems. In this paper the use of PMUs for power system voltage stability assessment is considered. as a sample application. A small example network is adopted as case study, and the impact of PMU...
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