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Existing VCMMs (virtual coordinate measuring machine) have been mainly developed to either simulate the measurement process hence enabling the off-line programming, or to perform error analysis and uncertainty evaluation. Their capability and performance could be greatly improved if there is a complete solution to cover the whole process and provide an integrated environment. The aim of this study...
This paper presents the development of a computer based data acquisition system that provides real-time monitoring of voltage and current at the customer's point of common coupling (PCC). Any power quality disturbances sustained by the user throughout the monitoring period were detected and recorded on remote PC. Post acquisition analysis was performed on the data collected. The power quality system...
A real-time electronic nose system is designed to analyze methane (CH4), hydrogen (H2) and their mixtures, the main combustible gases in the environment. The system is based on a single chip for acquiring measurement data from a gas sensor array. Four Fe2O3 gas sensors with little humidity effect are employed in the gas sensor array. A principal component regression (PCR) method is applied to process...
A PC based system for non-invasive, in-vivo measurement of carotid artery compliance is proposed here. The equipment is a low cost and reliable alternative to the expensive B-mode scanner for vessel wall tracking and stiffness measurement of the artery. The system gives an accurate recording of the distensibility waveform of the carotid artery that could then be used to estimate the various measures...
Interference and coexistence issues among devices deploying wireless communications are becoming more and more intrusive. The analysis of such phenomena can be carried out employing high frequency Spectrum Analyzers (SA). In this paper, performances of the main architectures of SA are experimentally analyzed and compared, in order to obtain helpful hints to choice the most suitable instrument for...
This paper reports a practical design and construction of a wideband channel sounding system for air-to-ground measurements at C band. A high precision Global Positioning System (GPS) time-stamped system is developed using the virtual instrument (VI) concept. With the implementations of the spread spectrum technique and through matched filter detection, the performance of the designed sounding system...
Formation porosity and water saturation play important role in evaluating potential oil reservoirs and for drafting development plans for new oil fields. This paper presents a novel method for estimating these two important parameters directly from conventional well measurements. The recently proposed Functional Networks technique is applied for rapid and accurate prediction of these parameters, using...
The paper presents the approach to the design of the virtual instruments performing parallel computations for signal processing. Based on the example of the virtual instrument performing both frequency and time measurements, the method of creating the measurement software working under the real-time operating system is explained. Comparison between the designed instrument and its non-parallel counterpart...
Determining the extent of dermal perfusion is crucial in assessing the healing of chronic wounds, of the kind encountered in diabetic ulcers and burns. An automated, contact-less, non-invasive means of analyzing the dermal perfusion in selected areas would be useful in this process. Such a technique is presented in this paper. It describes a virtual instrument developed for acquiring a series of visual...
Methods in vogue for the measurement of venous refilling time (VRT), based on the photo-plethysmographic (PPG) principle, employ a feedback compensation technique to remove the influence of the colour of a patient's skin. Hence these methods require a ldquostandardization phaserdquo for every measurement. Based on an appropriate model for the propagation of light through skin and tissue, a novel signal...
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