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This paper deals with low-invasive temperature monitoring inside freeze dryers. During lyophilization, both the temperature of the freeze-dryer shelves and the temperature of the products have to be measured in order to control the process and to guarantee the product quality. In addition, temperature measurements are essential to obtain reliable information during the development of the freeze-drying...
The paper presents specific approach to the designing of the mobile measurement station using the quality engineering rules. Specific expectations of the market and engineers as well, for such equipment, need to find non standard approach to the design procedures. One of the most important part of this design is the central processing unit selection. Authors describe the selection procedure and final...
Designing, optimizing and producing modern power amplifiers (PA) requires new and fast RF (radio frequency) measurement techniques capable of characterizing its real behavior. PAs are a truly multidimensional device where many desired performance parameters are contradictory to each other. This is especially true for the generation of modern communication PAs that require high efficiency, high linearity...
A measurement system is developed for the parameter detection and flow characterization of gas-liquid two-phase flow in micro-channel. Electrical capacitance measurement system and optical measurement system are designed for the micro-channels with different inner diameters of 4.0 mm, 3.1 mm and 1.8 mm respectively. In experiment, bubble flow, stratified flow, slug flow and annular flow are observed...
A scattering measurement system to determine the optical characteristics of industrial suspensions in the wavelength range 430-700 nm was realized. The suspensions were mixtures of water and solid matter; the optical characteristics measured were the absorption coefficient, the scattering coefficient and the anisotropy. The measurement system comprised two integrating spheres of 203 mm diameter, a...
The aim of this paper is to present a very simple, cheap and practical experimental technique that is able to estimate capacitors equivalent circuit for a wide range of frequencies. Capacitors equivalent circuit changes with temperature, aging and frequency. Thus, since capacitors have a wide range of applications, particularly in power electronics applications, the knowledge of their model at their...
A large number of foreign students come to Japanese universities recently, where Japanese reading and pronunciation are problems for the foreign students. In this study, we propose a new Japanese training system for foreign students. First, we analyze Japanese accents of foreign students. Second, we compare the accents of foreign students and the accents of Japanese standards. Finally, we develop...
Due to its restricted usage and accuracy in measuring extremely short interval of time, TDC (time to digital converter) embedded measurement devices are relatively expansive. Even if new applications are being developed in daily life as well as in industry, the cost condition of TDC based measurement systems needs to be improved. To reduce the deployment cost on a commercial scale, analogue interpolation...
The research is devoted to investigate about the coordination in the time domain of the operations executed by the Measurement Instrument (MI) connected to the node of the Distributed Measurement System (DMS), by hardware interface, and the node clock. To avoid the random effects of concurrency of the software processes, the interface is based on the Programmable Logic Device (PLD). From the analysis...
In the paper is proposed the use of the personal digital assistant (PDA) to share the common sense of time to the measurement instruments (MIs) not reachable, or not convenient to reach, by wired or wireless connections to the distributed measurement system (DMS). For this reason is not possible to use the standard synchronization protocol, or the propagation of a electromagnetic signal used as reference...
This paper deals with the development of a complex measurement system for the online control of a laboratory scale DC grid located at "Politehnica" University of Bucharest. This has been achieved by making use of various communication methods among different modules, like DC source, energy meters, server, controllable "load computers", digital oscilloscope and multimeter. PHP and...
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