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Fiber optic sensors come in useful in the various fields of industry. Advantages of optic fiber sensors are based on the properties of optical fibers and partly profits from their technological development. The fiber optic temperature sensors use different kinds of sensing, all of them reach the upper sensing limit about 600°C. The aim of this article is to introduce a principle of sensor which is...
This paper introduces a method of evaluating the hazardous failure rate of a safety relevant control system if the state probability distribution is given as a result of an absorbing Continuous Time Markov Chain analysis. Markov Chains with more than one absorbing state are contemplated and eventually the case study is presented.
The paper deals with an experimental workplace for a measurement selected parameters of the communication buses. It puts emphasis on use the CAN bus which is frequently uses in the automotive electronic systems at present. There were created the requirements for research of communication parameters, a comparing for example the CAN bus with serial interface etc. In the paper is introduced the workplace...
The need of critical applications has derived in the development of several techniques that aim to guarantee system operability. The vast majority of these systems own a microprocessor to control its functionality. Thus, system reliability largely depends on the proper function of the microprocessor. This article presents a state of the art in the techniques for reliable microprocessor architectures...
In this paper we present a software interface for multiple watchdog timers. Watchdogs are generally used to improve reliability of a computer system. In our proposed approach we use hardware watchdogs to secure not only the whole system, but also the processes self. In embedded systems it is common to check processes by using software watchdogs and to check the system by using one or few hardware...
The importance of wireless communications, involving electronic and electro optical devices, has been growing. FSO is a very important technology in this context. A very high speed 1550 nm FSO link over 1.14 km has been successfully implemented for purposes of high requirement applications at Gbps, at the University of Beira Interior Campus located at Covilha city, Portugal. An experimental performance...
This paper describes one part of our Biotelemetric System. This part is hardware platform from preprocessing of ECG signal. In order to real time visualization of ECG data, we need measure and process real data from ECG device. This paper discusses main possibilities to solve this problem. First possibility is using of commercial devices, such as embedded PCs, PDAs and wireless ECG unit BlueECG communicating...
This paper describes development of a biotelemetric system and problem of real time processing of ECG signal. In this case of signal processing ECG CorBelt primarily on mobile embedded monitoring stations. The Whole system is based on Microsoft product as Windows Mobile, Microsoft SQL Server, .NET Micro Framework, .NET Compact Framework and .NET Framework. On paper is deal with ECG measurement devices...
This paper focuses on problems of the end to end voice quality assessment. Up to now there have been developed lot of measuring methods, which objectively determine final quality of transmission. This paper deals with the PESQ (Perceptual Evaluation of Speech) algorithm described in the ITU-T P.862 and its use. The basic intent of this work was to develop a device which is able to measure voice transmission...
The inrush current occurs during transformer energization due to flux saturation in the core. Controlled switching connects transformer to power grid in proper phase angle derived from core remanent fluxes. The DC forced magnetization prior to transformer energization is one of simultaneous closing strategy methods. Active intervention to the transformer remanent flux was realized as a DC power supply...
The following topics are dealt with. fuel cell vehicles; radio network; electric machine; oscillators; convertors; signal processing; biomedical telemetry; filters; FPGA; software engineering; microprocessor chips; biomedical image processing; and machine control.
This work studies the effects of the prefilter bandwidth in the sequential symbol synchronizers based on clock sampling by positive transitions. The prefilter bandwidth B is switched between three values, namely B1=∞, B2=2. tx and B3=1. tx, where tx is the bit rate. The synchronizer has two variants, one discrete and other continuous. Each variant has two versions, one manual and other automatic....
The paper presents a simple and efficient algorithm that separates three speech signals from two mixtures. Cochlear filtering and the ratio between the time-frequency representations of the two mixtures are used. It follows a method that works for both convolutive and instantaneous mixing models. Simulation results are also presented to confirm the proposed approach.
This paper deals with electrically conductive adhesives and an innovative quality estimation method based on thermal field evaluation. The resistance of joints heated by passing current can be roughly estimated by the use of temperature field picture. Methodology of calculation of the resistance of the joint, based on a temperature curve across the component is presented.
Universal apparatus for measuring Raman spectrography (RS) on surface of solid state samples was designed and realized. It enables to obtain Raman spectrum from the measured semiconductor sample excited by powerful Arion or HeNe lasers, alternatively. The PC controlled equipment consists of a composite optical setup, lasers, optical monochromator, very sensitive CCD camera, micromanipulators, and...
This paper focuses on high speed video acquisition system designing for biomedical image enhancement. The paper gives information about microscope dimmer using in image analysis. Due to fast digital camera, system contains intelligent illumination dimming hardware automatically regulated through measurement card. Regulating parameter for dimmer (PWM duty cycle) is computed from image features, histogram...
This paper presents development of a determinist connection between wire and wireless network based on mathematical model. The network model simulates data transfer between a wire and wireless nodes. The basic network topologies are discussed here. The determinist communication processes are based on parallel signal processing in the real time. We have focused our research on WiFi and Industrial Ethernet...
The safety of the real-time processes in embedded systems is nowadays commonly ensured by the watchdog timer mechanism. Although this method is generally considered as reliable, there exists a certain risk that the hardware watchdog timer that is standardly shared by many processes, would become unusable because of incorrect handling by a broken process. This paper deals with the architecture providing...
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