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To maintain high performance in communication systems, it is required have optimal design and analysis of antenna for RFID tags at UHF and Microwave Frequency. In this approach paper the main focus is on the specific characteristics of RFID for advanced applications in current development of RFID antenna. To reduce size of antenna meander line structure of antenna is adopted. The antenna modeling...
This work describes the measurement of the frequency response of the wavelength modulation in a laser diode, for application in a closed-loop interferometer. The wavelength modulation is derived by the measurement of the interferometric phase, while the frequency response is estimated by means of frequency-domain model identification techniques.
In this paper we propose a new automated vision system for rapid fire onset detection. In order to prevent the born of a fire, a system constituted by two firewire cameras and a laptop, that manages images from the cameras and remotely controls a fire extinguisher, was designed and realized. This system is a very promising substitute for common fire sprinkler systems in closed environment.
It is researched about the measurement characteristics of vortex flowmeter in air-water vertical upward two phase flow in this paper. The diameter of the pipeline is 50 mm, the flow velocities of the water vary from 0.849 m/s to 1.415 m/s and the void fraction of the gas is 1% to 20%. According to the experimental results, the repeatability of the vortex flowmeter can be used as a criterion for the...
This paper describes an implantable system for the in vivo measurement of both micromotion and migration in applications such as total hip arthroplasty (THA) and total knee arthroplasty (TKA). The system is based on a modified form of linear variable differential transformer (LVDT) whose null-point is set automatically by means of a self-calibration algorithm. The self-calibration process not only...
Pressure transducer is generally calibrated in room temperature. But in many applications, pressure transducer may be required to work in a very low temperature down to -40degC. Pressure measurement will be affected by extreme temperature in those cases. For example, those real experiments in cold area, transducer and its measurement system often work at very low temperatures. The paper describes...
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...
In this paper, CMOS analog front-end circuits for silicon condenser microphones are newly proposed. The proposed analog front-end circuits are attractive due to that all the analog block circuits for silicon condenser microphones are robust and compact to be integrated. Based upon the device parameters of 0.35 mum 2P4M CMOS technology with 3 V power supply, all the functions and performance of the...
Time domain reflectometry (TDR) is a robust approach for measuring static electrical conductivity of moistened granular materials. Although initially introduced for monitoring soil salinity, its application to granular materials might be an interesting and cost-effective means for monitoring the quality-status of various materials. However, the traditional approach requires tedious and time-consuming...
Characterizing power amplifiers require test set-ups with performance superior to the power amplifiers. A commonly used method is to use an IQ-demodulator. However, problem arises due to imperfections in the demodulator such as IQ-imbalance; an alternative method is to use a direct down converter to intermediate frequency. The drawback then is the limited bandwidth. However, the required bandwidth...
Here it is presented a system able to perform automatic measurements, according to national and international standards, of the illuminance and the luminance produced by a road lighting system. Even if it requires the road under analysis is closed, it reduces highly the required time for qualifying a road lighting plant. The description of the system is presented together some exemplifying measurement...
An electrical resistance tomography sensor consists of a set of measurement electrodes. In general, finite element method (FEM) is used to solve the forward problem (i.e. calculate the resistance value for a given conductivity distribution and electrodes setup). In this paper, a new approach is proposed. The equivalent resistor network model of an electrical resistance tomography (ERT) sensor has...
Coupling-induced oscillations are a feature that appears to be universal in coupled systems that are (individually) described by bi-or multi-stable potential energy functions U(x); these properties are being exploited in a new class of dynamical sensors being developed by us. Here, we describe one of these devices, a coupled core fluxgate magnetometer (CCFM), whose operation is underpinned by this...
Present work proposes a novel, low cost non-contact temperature measurement technique using consumer grade digital still camera. The images of various visible heat sources are captured. Using colour image segmentation, source zones are identified. The actual temperature is measured by placing a miniature thermocouple in each zone. The colour temperature correlation is established by applying various...
This research presents a two phases heuristic neural network combined algorithmic approach to solve multiple depot routing problem with heterogeneous vehicles. It has been derived from embedding a heuristic based two level clustering algorithm within a multiple depot vehicle routing problem optimization framework. In logistic applications, customers have priority based on some logistic point of view...
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...
It has been proven that detecting the type of coal burning in the boiler is very important to the thermal power plants. But the identification of the coals online is hard, especially for the blended coals. In this paper, three flame information including average, standard deviation and oscillation frequency are extracted by a flame detector, and using the information extracted composes the flame feature...
A model is developed to evaluate the region traffic safety using principal component analysis (PCA). Traffic safety index obtained by the proposed model is a good measure to the level of the region traffic safety. The main difficulty of this model is how to choose the evaluation data basis because of the fact that different data basis has different evaluated results. In this work, two kinds of typical...
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...
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