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.
Measuring a magnetic field by pulsing electrical current through a wire placed in the magnetic field, followed by measuring the displacement of the wire as a travelling wave passes a displacement sensor, is a technique typically referred to as a pulsed wire measurement. The goal of these measurements is to extract the magnetic field distribution of the magnet from the time dependent wire displacement...
Ultrasonic NDE uses high frequency acoustic waves to evaluate materials, and often signal processing is required to detect echoes from defects in the presence of microstructure scattering noise. Scattering noise, also known as clutter, interferes with the flaw signal and cannot be completely eliminated by using classical signal processing methods such as band-pass filtering. In this paper, neural...
An ultrasonic signal is rarely used for information transmission in solids because it attenuates, scatters, disperses and reverberates in the channel. In some environments, the ultrasonic signal is the only option for communication since radio frequency (RF) electromagnetic waves cannot propagate in the medium. This paper presents the feasibility of using an ultrasonic signal in the frequency range...
Ultrasonic Non-Destructive Evaluation (NDE) uses high frequency acoustic waves to evaluate materials, and often signal processing is required to detect echoes from defects in the presence of micro-structure scattering noise. Scattering noise is known as the clutter. The clutter interferes with the flaw signal and cannot be completely separated from it by using conventional signal processing methods...
Measuring a magnetic field by pulsing electrical current through a wire placed in the magnetic field, then measuring the displacement of the wire as a travelling wave passes a displacement sensor is a technique typically referred to as a pulsed wire measurement. The techniques presented provide a method of correcting for the dispersion in the travelling wave and the averaging effects of pulse duration...
An ultrasonic signal is seldom used for information transmission because it attenuates, scatters, disperses and reverberates in the channel. In some environments, the ultrasonic signal is the only option for communication since radio frequency (RF) electromagnetic waves cannot propagate in the solid and metallic media. This paper presents the feasibility of using an RF ultrasonic signal as the energy...
In ultrasonic NDE applications, the received signal carries valuable physical information along the wave propagation path such as locations, orientation and sizes of discontinuities. Various signal processing algorithms have been utilized to interrogate ultrasonic echoes, highly overlapped and sometimes noise-contaminated. As of assessing and monitoring the in-situ outsized structures, it becomes...
In this investigation, compressed sensing (CS) is utilized to examine the sparsity of ultrasonic NDE signal, which consequently improves the efficacy of data sampling with significant lower rate than the Nyquist rate. The time-of-arrivals (TOAs) and amplitudes of dominant echoes are estimated through annihilating filter in the CS via matrix operation. The matrix size is proportional to the number...
Helping people with visual difficulties navigating indoor is challenging. Unlike most of outdoor navigation systems, indoor navigation devices are not able to receive satellite signals. Moreover, indoor navigation usually requires higher positioning accuracy when compared with outdoor applications. In this paper, we propose an indoor positioning system based on AR (augmented reality) markers and computer...
Advances made with new technologies have boosted the development of systems to assist the daily lives of the visually impaired people. These systems intend to help by providing their user with some critical information about their environment using senses they can still use. In this paper, we discuss a system that uses existing technologies such as the Optical Character Recognition (OCR) and Text-to-Speech...
This paper presents a method to convey images to visually impaired people. It takes the images from a camera, which could be on a smartphone or embedded into eyeglasses, and then converts them into a set of modulated frequencies mixed together into one single audio melody, that is then played back to the user. Although it is very difficult for a normal user to makes sense of all the information that...
In this paper, a high precision QR decomposition implementation on FPGA is discussed. The Gram-Schmidt algorithm is used and synthesized from high level language to Register Transfer Level (RTL) Verilog HDL, using High Level Synthesis (HLS). The RTL Code is synthesized and implemented on Xilinx Zedboard FPGA. The IP core that is generated during simulation is designed for 10×10 floating point and...
This paper describes the design and implementation of an End-to-End digital wireless communication system (E2E) system on the Zynq-7000 Field Programmable Gate Array (FPGA) and Evaluation Development (Zed) Board with an Analog Devices AD9364 Wideband Transceiver from a model-based design system. Furthermore, the paper presents the design path to reconfigure the software controlled logic blocks for...
In today's energy grid there are very few options to handle the severe energy swings of renewable energy sources. A Synchronverter is designed to allow an asynchronous energy source like wind mills and solar panels to appear as a synchronous energy sources. To this day, the designs have been analog with large size and large assortment of components. This paper proposes a digital design that matches...
As FPGAs have grown ever larger, there has been a shift in the manner in which they are programmed. Early on, it was typical for designers to design all FPGA firmware in house using VHDL and Verilog. This gradually shifted towards design reuse at the IP Core Level. However in modern times, even designs at the IP level are having trouble adapting quickly enough to customer demands. This has resulted...
Sorting is a labor intense process. With machines that can recognize objects, it is possible to automate the sorting process. In this paper, we present a robotic sorting arm based on color recognition technique. In this system, when a new frame is captured by the camera, the object will be detected using color-base image processing technique. The position of the object in real-world will be calculated...
Ultrasonic Non-Destructive Testing (NDT) and imaging systems has been widely used for industrial and medical applications. In NDT system, detection and characterization of target signal can be extremely challenging because of the complex echo scattering environment and the system noise. In this paper, an algorithm based on Neural Network (NN) is presented to explore the possible solutions for ultrasonic...
Ultrasonic testing and imaging systems have evolved from a basic single transducer system to arrays capable of 3-dimensional scans. These systems need to be flexible and also reconfigurable in order to acquire and process a vast amount of data. The system must also allow for a variety of parameters like the data acquisition rate, signal lengths and processing characteristics which need to be reconfigurable...
In this investigation, a comparative study of two time-series analysis techniques, singular spectrum analysis (SSA) and empirical mode decomposition (EMD), is carried out for ultrasonic NDE applications. Unlike transform-based approaches, the SSA and EMD are fully driven in the time domain by the data itself. The SSA method captures the trend of signals via eigenvalues from a trajectory matrix. Whereas...
The ultrasonic signals backscattered from multilayered materials using a pulse-echo method are inherently low-resolution due to the band-limited nature of the interrogating transducer. To improve resolution, the Wiener Filter (WF) based solutions have been used traditionally, although they provide limited improvement and are highly sensitive to noise. More recently, sparse deconvolution techniques...
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.