The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The steady state response of a system to a periodic input is still corrupted by noise transients. For lightly damped systems these noise transients increase considerably the variance of the measured frequency response function (FRF). This paper presents a method that suppresses the influence of the noise transients (leakage errors) in FRF measurements. The method is based on a local polynomial approximation...
The paper deals with the estimation of amplitude and phase of an analogue multi-harmonic band-limited signal from irregularly spaced sampling values. To this end, assuming the signal fundamental frequency is known in advance (i.e., estimated at an independent stage), we propose a complexity-reduced algorithm for signal reconstruction in time domain. The proposed method of processing can be used for...
In this paper, a total solution of the analog sensing circuits with delta-sigma modulator for CMOS micro-accelerometers is designed. The proposed total solution is attractive due to that all the analog and digital block circuits for CMOS micro-accelerometers are robust and compact to be integrated. Based upon the device parameters of 0.35 μm 2P4M CMOS technology with 3 V power supply, all the functions...
Development of efficient microwave real-time imaging systems is of great interest for many applications. A cost-effective design of such systems utilizes a switched transmit-receive array composed of efficient antenna elements. The utilized imaging arrays are typically planner and consist of large number of closely-spaced elements. The performance of these systems depends largely on the efficiency...
Temperature measurement based on infrared radiation depends on correctly adjusted emissivity. However, emissivity configuration is not an easy task because emissivity is not normally known with precision, it is influenced by radiation reflections, and can also change with the temperature. The wedge method is a temperature measurement method which assures correct correct emissivity configuration using...
In industry, gas/liquid two-phase flow in horizontal pipe is very common in many industry processes, and their measurements are of significance. In our works, a series of gas/water two-phase flow experiments in a horizontal pipe were conducted in which the V-cone differential pressure meter was used, and a soft-sensing method was brought forward in which the hybrid feedback (HF) Elman wavelet neural...
The exponential resistance-temperature characteristic of a thermistor necessitates the use of a linearising circuit to ensure proper measurements whenever a thermistor is employed as a sensor for measuring temperature. A dual slope type resistance to digital converter that accepts a thermistor as input and provides a digital output linear to the temperature being sensed by the thermistor, is presented...
The importance of moisture measurement in grain and seed is discussed, and a brief history of the development of moisture sensing instruments, based on sensing of dielectric properties of these materials, is presented. Data are presented graphically on the permittivities or dielectric properties of grain and seed showing their variation with frequency, moisture content, temperature, and bulk density,...
A method for modeling and measuring electromagnetic transients due to eddy currents in fast-pulsed resistive magnets is proposed. In particular, an equivalent-circuit model and a method for time-domain measurements of eddy currents are presented. The measurements are needed for an accurate control of the magnetic field quality to ensure adequate stability and performance of the particle beam in particle...
Electrical impedance tomography (EIT) is a technique for reconstructing conductivity of an inhomogeneous medium by injecting currents at the boundary of an object and measuring the resulting changes in voltage. The SNR of acquisitive data and the reconstructed image quality of EIT system are directly determined by current drive patterns. In this paper, eight current drive patterns with the same boundary...
A magnetic compass requires a careful calibration procedure and complicated compensation algorithms before obtaining precise heading because of its vulnerability to several types of errors. Existing calibration approaches are not applicable for a 2-axis digital compass applied in pedestrian navigation, especially in order to eliminate predictable magnetic disturbances and tilt error without a tilt...
A new sensing method, termed Multiple Excitation Capacitance Polling (MECaP), has been developed to improve the efficiency of Electrical Capacitance Tomography (ECT). Instead of applying one excitation signal to an electrode at a time, the MECaP technique progressively applies an increasing number of excitation signals to multiple electrodes, and measures the capacitance values simultaneously, thereby...
Real-time scalable data acquisition systems and high performance transducer arrays are strongly interconnected subjects as most transducer arrays demands sophisticated readout systems in order to perform properly. Sound and ultrasound systems such SOund NAvigation and Ranging (SONAR), Sonography, Speech Recognition, Robotic Sensing and Sound Source Separation are a few of many systems that can deploy...
This paper presents a design that realizes a dual-channel Data Record Card which achieves 33 MB/s data transfer rate and 4 GB capacity per channel with CF Card and SDRAM. According to the characteristics of data transfer with CF Card, an advanced data transfer method is provided, which reduces the requirements of memory resources in FPGA without influencing the data transfer rate. And it realizes...
This paper presents an image-based framework for measuring target objects on an oblique plane by using a single CCD camera and two parallel laser projectors beside the camera. Because of the alignment of the laser beams which form in parallel with the optical axis, projected spots in the image can be processed to establish relationships between distance and pixel counts between the projected spots...
The impact of transmit-antenna spacing and signal-to-noise-ratio on channel capacity has been measured intensively in a variety of scenarios. When looking at the physical layer throughput of a multi-antenna communication system, the behavior over antenna spacing may look completely different, leading to other conclusions regarding the optimal antenna distance. In this paper, we compare -by testbed...
This paper presents an architecture and corresponding analysis of a direct built-in test of integrated millimeter-wave radar receiver frontends. The proposed test is able to evaluate the gain of the device as well as its noise figure. Focus of this work is the prediction of the accuracy of the tested performance parameters during the design of embedded test solutions. The introduced architecture provides...
This paper extends Savitzky-Golay smoothing to cyclic multivariate data. An algebraic framework is presented that permits the synthesis and analysis of polynomial approximations. A new generalized recurrence relationship is derived, which can be used to synthesize orthogonal polynomials from a set of arbitrary nodes lying in the complex plane. It is proved that any weighted polynomial whose weighting...
A novel fault detection and isolation scheme for a class of nonlinear systems is presented in this paper using fuzzy adaptive observer. First, the study assumes the physical process can be described by Takagi-Sugeno (T-S) fuzzy model. In the light of the T-S fuzzy model of the plant, the fuzzy observer comprises a number of locally linear observers and the final state estimate is a fuzzy fusion of...
Capacitance can be measured by utilizing the phase delay through an RC network consisting of the unknown capacitance and a resistor. Specifically, the RC network delays the state change of an input square wave to produce a pulse width modulated signal based on the phase delay through the RC network. The response of this implementation, however, becomes severely nonlinear if the phase delay is greater...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.