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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 surge protector (SP) protects the medium wave transmitter damages from deterioration of the VSWR on the output transmission system including the antenna characteristics. In this paper describes the avoidance for SP operation on the antenna VSWR characteristics under the sharpness of the impedance characteristics on high frequency audio modulation. We developed the new type of narrowband detection...
A ground monitoring system that exploits electromagnetic field properties of accounting of both physical and geometrical features of the surrounding medium is proposed. The system is based on TDR tests, assisted by a control and processing unit, and aims at detecting starting cavities underground in the soil. The digital signal processing approach deployed for waveform analysis, which plays a fundamental...
During the recent years, capacitor voltage transformers (CVT) gradually replace the electromagnetic voltage transformers (EVT) in high-voltage measurements. Because transient response of the CVT is worse and there are other defects, recently much research work has been focused on improving CVT. In this paper CVT by parallel connecting capacitances with resistances is put forward. Then its principle...
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...
This paper deals with the development and the metrological management of an acquisition system that has been developed for monitoring an experimental photovoltaic (PV) plant. The main targets are the comparison among the performance of different photovoltaic technologies and the verification of the nominal specifications of the employed PV modules. For these reasons, the traceability of the measurements...
A wireless multihop network is a communications network composed of nodes equipped with wireless interfaces and organized in an ad hoc manner. It has become an attractive and practical solution for providing flexible and extended wireless coverage over large areas. Measurement of physical layer quantities can provide useful information in the design of networking protocols and cross-layer optimization...
One-way network delay is a critical parameter in VoIP as it allows the application to assess the perceived quality. However, it is well known that it is very difficult to measure one-way delay of the VoIP packets traversing the network. This is because the Internet architecture is based on the end-to-end principle in which the endpoints are connected to the network independently, typically without...
During the last few decades a growing interest in monitoring and preserving strategic heritage and civil structures, has pushed the research towards the development of new devices and strategies for measuring the quantities of interest. The measuring strategies, based on innovative transducers, are required to avoid any significant influence on the monitored structure either in terms of functionality...
The instrumentation technologies required to achieve optimized combustion in pulverized fuel power plants represent an important challenge under increasing economical and environmental pressures. The present paper reports on the final results of a British government funded project to bring together various new and emerging sensing technologies aimed at achieving this goal. Both fuel flow and burner...
In the last few years solutions adopted in industrial communication have been deeply changed thanks to the adoption of technologies borrowed from completely different areas. In particular, the advent of hybrid wired/wireless networks promises to greatly improve efficiency and scalability. However, their success will depend on the availability of standard solutions, that ensure multivendor compatibility...
The possibility to provide people with visual impairments walking in indoor environment with an optimized degree of information about the presence of services and hazards is of primary importance to improve their autonomy and self estimate. Many passive systems are currently adopted such as tactile paths or Braille signs, anyway the use of active systems easily reconfigurable and interacting with...
This paper presents a software-based instrument for testing and monitoring the behavior of complex communications systems that employ a number of interconnected DSPs. The instrument is based on a dynamic architecture that incorporates a set of distributed software probes for signal capturing and a central data acquisition unit for acquiring and post-processing of data. A high level application that...
One solution for increasing the use of renewables is to find new strategies to allow distributed energy resources (DER) connection with the existing power system. A solution which allows a flexible integration of dispersed generation (DG) into energy networks is the use of DC at the user layer. One reason for choosing nowadays the DC technology for electrical energy distribution is the trend in the...
In many applications, it is desired to monitor the human body motion to provide useful information for applications such as rehabilitation, virtual reality, sports science etc. Most existing inertial/magnetic systems used for body motion tracking today come with wiring which restrains the natural movement. In this paper, a wearable wireless sensor network using accelerometers has been developed for...
This paper discusses the design of a broadband wireless network infrastructure which itself is a rain measurement platform for applications such as disaster alarm and sudden hazard decision management systems. A sensor testbed is setup which consists of a hybrid broadband wireless network in conjunction with real-time acoustic rain rate point sensors and complementary rain gauges. The testbed simulates...
Operational lifetime of wireless sensor network (WSN) nodes is crucial in a variety of monitoring applications. As the radio chip is usually the most power-hungry component in small, low-cost WSN devices, battery lifetime can be extended by reducing the duty-cycle of the radio module. In fact, the wireless chip could be switched on just to run the tasks of the considered application, while it could...
Ground water level measurements are very important for a wide range of applications in geosciences, agriculture, environment monitoring and mining industry. Currently, reliable and automatic ground water level measurements have not been realized. This paper presents the simulation and design of a segmented resistance sensor for measuring ground water level. Based on this sensor design, we have developed...
This paper proposes a novel approach to minimize leakage currents in CMOS circuits during the off-state (or standby mode, sleep mode) by applying the optimal reverse body bias to the substrate (body or bulk) to increase the threshold voltage of transistors. The optimal bias point is determined by comparing the sub-threshold current (ISUB) and band-to-band current (IBTBT) simultaneously. The proposed...
Aim of this work is to present a metaphor based multilevel interface for an Intelligent Transport System (ITS) designed to handle the transport of hazardous materials. This ITS was developed by the authors in the framework of a research project funded by Apulia Region (Italy). Starting from monitoring some parameters of a vehicle in motion such as position, speed, load balancing, stress conditions,...
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