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The paper proposes an experimental approach to the optimization of synchronization protocols for wireless sensor networks. The authors' research is aimed in both minimizing the synchronization residual error and the wireless sensor node energy consumption. The approach has been thought to be applied to different synchronization protocols and to give the best results for small scale wireless sensor...
This paper proposes a bit error rate (BER) measurement system utilizing vector signal analyzer (VSA) instrument built-in analog digital converter (ADC) and ideal digital baseband receiver of VSA software for RF integrated circuits (RFICs) such as RF amplifier, RF mixer and RF receiver. Usually, BER performance is estimated in transceiver with built-in digital baseband circuits. In the past, RF designers...
The feasibility of applying capacitively coupled contactless conductivity detection (C4D) technique to void fraction measurement of gas-liquid two-phase flow is investigated. As a preliminary study, this research focuses on the void fraction measurement of stratified flow and includes three parts. First, a C4D sensor is developed based on series resonance principle, and a void fraction measurement...
Mobile devices, such as smart phones and tablets have become widely popular as an access to the internet and an easier approach to deal with and share real-time digital information. Mobile devices are in general consisted of the integral design and fabrication of optical, electronic, mechanical and MEMS sensors. Expanding the utilities of such sensors to perform easier instrumentation and measurement...
For determining the dynamic on-resistance Rdyn,on of a power transistor, the voltage and current waveforms have to be measured during the switching operation. In measurements of voltage waveforms, using an oscilloscope, the characteristics of an amplifier inside the oscilloscope are distorted when the range of the measurement channel is not set wide enough to measure both on-state and off-state voltage,...
This paper presents the experimental investigations for performance evaluation of an air-bearing displacement sensor as a measurement system for nanometrology of surface forms by using it. The experimental configuration and some considerations for the air-bearing displacement sensor are described. Then, in order to identify the basic performance of the sensor, a measuring force and displacement output...
This paper focus on the problem of ensuring Wireless Sensor Network (WSN) synchronization for measurement applications. The goal is to guarantee high accuracy synchronization requirements while maintaining at the same time a long network lifetime. In this view, we propose an approach that enforces synchronization accuracy only when it is needed and only in the sub-network of nodes involved in the...
In this paper, a scanning-light method is proposed to evaluate the form of the tool cutting edge in a wide range up to several millimeters. An optical system, which consists of a photo diode, a laser diode unit and an objective lens, was developed. A small laser spot generated by the objective lens scans across the tool cutting edge, while monitoring the intensity of the laser beam passed through...
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