Improvement of acquisition time using high speed MEMS bolometer in active imaging

2020 ◽  
Author(s):  
Isao Morohashi ◽  
Ya Zhang ◽  
Boqi Qiu ◽  
Norihiko Sekine ◽  
Kazuhiro Hirakawa ◽  
...  
Keyword(s):  
High Speed ◽  
Acquisition Time ◽  
Active Imaging

Spin-polarized Scanning Electron Microscopy

1990 ◽  
Vol 48 (4) ◽  
pp. 768-769
Author(s):  
Kazuyuki Koike ◽  
Hideo Matsuyama
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
High Speed ◽  
Magnetic Thin Films ◽  
Electron Spin Polarization ◽  
Acquisition Time ◽  
Magnetization Direction ◽  
Spin Polarized ◽  
Conventional Methods ◽  
Scanning Electron

Spin-polarized scanning electron microscopy (spin SEM), where the secondary electron spin polarization is used as the image signal, is a novel technique for magnetic domain observation. Since its first development by Koike and Hayakawa in 1984, several laboratories have extensively studied this technique and have greatly improved its capability for data extraction and its range of applications. This paper reviews the progress over the last few years.Almost all the high expectations initially held for spin SEM have been realized. A spatial resolution of several hundreds angstroms has been attained, which is nearly one order of magnitude higher than that of conventional methods for thick samples. Quantitative analysis of magnetization direction has been performed more easily than with conventional methods. Domain observation of the surface of three-dimensional samples has been confirmed to be possible. One of the drawbacks, a long image acquisition time, has been eased by combining highspeed image-signal processing with high speed scanning, although at the cost of image quality. By using spin SEM, the magnetic structure of a 180 degrees surface Neel wall, magnetic thin films, multilayered films, magnetic discs, etc., have been investigated.

scholarly journals High-Speed Video Analysis of the Process Stability in Plasma Spraying

2021 ◽  
Author(s):  
K. Bobzin ◽  
M. Öte ◽  
M. A. Knoch ◽  
I. Alkhasli ◽  
H. Heinemann
Keyword(s):  
Plasma Spraying ◽  
High Speed ◽  
Plasma Jet ◽  
Plasma Jets ◽  
Time Dependent ◽  
Acquisition Time ◽  
Fast Fourier Transformation ◽  
Frequency Spectra ◽  
Dependent Signal ◽  
The Stability

AbstractIn plasma spraying, instabilities and fluctuations of the plasma jet have a significant influence on the particle in-flight temperatures and velocities, thus affecting the coating properties. This work introduces a new method to analyze the stability of plasma jets using high-speed videography. An approach is presented, which digitally examines the images to determine the size of the plasma jet core. By correlating this jet size with the acquisition time, a time-dependent signal of the plasma jet size is generated. In order to evaluate the stability of the plasma jet, this signal is analyzed by calculating its coefficient of variation cv. The method is validated by measuring the known difference in stability between a single-cathode and a cascaded multi-cathode plasma generator. For this purpose, a design of experiment, covering a variety of parameters, is conducted. To identify the cause of the plasma jet fluctuations, the frequency spectra are obtained and subsequently interpreted by means of the fast Fourier transformation. To quantify the significance of the fluctuations on the particle in-flight properties, a new single numerical parameter is introduced. This parameter is based on the fraction of the time-dependent signal of the plasma jet in the relevant frequency range.

Fine-tuning of LA-ICP-QMS conditions for elemental mapping

2020 ◽  
Vol 35 (11) ◽  
pp. 2494-2497 ◽  
Author(s):  
Johannes T. van Elteren ◽  
Dino Metarapi ◽  
Martin Šala ◽  
Vid S. Šelih ◽  
Ciprian C. Stremtan
Keyword(s):  
Repetition Rate ◽  
High Speed ◽  
Scanning Speed ◽  
Fine Tuning ◽  
Acquisition Time ◽  
Elemental Mapping

For high-speed elemental mapping, LA-ICP-QMS conditions such as scanning speed, repetition rate and acquisition time are optimized as a function of the dosage and the washout time.

Time-space identification of mechanical impacts and distributed random excitations on plates and membranes

2019 ◽  
Vol 233 (18) ◽  
pp. 6436-6447
Author(s):  
Patrick O'Donoughue ◽  
Olivier Robin ◽  
Alain Berry
Keyword(s):  
High Speed ◽  
Virtual Work ◽  
Spatial Density ◽  
Acquisition Time ◽  
Virtual Fields Method ◽  
Full Field ◽  
Vibration Data ◽  
Time Space ◽  
Identification Approach ◽  
Field Excitation

The identification of dynamic loads acting on structures is a key aspect of several engineering domains involving structure-borne sound and vibration problems, stress analysis, or even the study of fatigue-induced structural damages. This work is concerned with the reconstruction of localized transient and distributed random excitations on plates and membranes from their measured vibration response. In previous investigations by the authors, the virtual fields method, an identification approach based on the principle of virtual work, was employed to identify mechanical and acoustic loadings applied to a bending panel. However, vibration data were obtained using scanning laser Doppler vibrometry, which limits the application of the virtual fields method to stationary excitations in both space and frequency. In contrast, the deflectometry technique used here is an optical method that directly provides a full-field measurement of local slopes. With the addition of a high-speed camera, the measurements are resolved in both space and time, enabling the study of nonstationary excitations. Moreover, since the acquisition time is independent of the number of measurement points, high spatial density measurements can be performed in seconds. This paper reviews the principles of the virtual fields method for nonstationary excitations on plates and membranes. The deflectometry technique is then demonstrated and experimental reconstruction results on an aluminum panel are presented for two different load cases: impacting metal marbles (multiple unknown transient excitations) and a diffuse acoustic field excitation. Finally, the identification of acoustic and aerodynamic (turbulent boundary layer) excitations is considered using a membrane as the receiving structure.

scholarly journals NANOINDENTATION AND ACCELERATED PROPERTY MAPPING OF PORTLAND CEMENT PASTE

2020 ◽  
Vol 27 ◽  
pp. 96-100
Author(s):  
Jiří Němeček ◽  
Jiří Němeček ◽  
Jaroslav Lukeš
Keyword(s):  
Portland Cement ◽  
Cement Paste ◽  
High Speed ◽  
High Strain ◽  
Acquisition Time ◽  
Strain Effect ◽  
Innovative Method ◽  
Reduced Modulus ◽  
One Year ◽  
Portland Cement Paste

This paper presents a new nanoindentation mode: accelerated property mapping (XPM) applied to one year old Portland cement paste. The principle of the innovative method is similar to classical quasi-static nanoindentation but the time necessary for performing one indent is significantly decreased from minutes to tenths of seconds. The XPM mode is capable of measuring maps of local mechanical properties (reduced modulus, hardness). The method was compared to classical nanoindentation mode. The main advantages of XPM measurement are higher spatial resolution, lower property fluctuation and lower acquisition time. However, XPM is not able to measure some parameters such as creep. Also, high speed loading of XPM brings high strain effect which artificially shifts values of reduced modulus to higher values compared to quasi-static loading cases.

Fast reconstruction tools for ptychography at Sirius, the fourth-generation Brazilian synchrotron

2020 ◽  
Vol 53 (6) ◽  
pp. 1550-1558
Author(s):  
Giovanni L. Baraldi ◽  
Carlos S. B. Dias ◽  
Francisco M. C. Silva ◽  
Hélio C. N. Tolentino ◽  
Eduardo X. Miqueles
Keyword(s):  
High Speed ◽  
High Performance ◽  
Phase Retrieval ◽  
Scattering Data ◽  
Fourth Generation ◽  
Acquisition Time ◽  
Optimization Strategy ◽  
X Ray ◽  
Mixed Precision ◽  
Synchrotron Light

Described here are image reconstruction optimizations for ptychographic coherent X-ray scattering data and X-ray fluorescence, which have been developed for the new fourth-generation synchrotron light source, Sirius, at the Brazilian Synchrotron Light Laboratory. The optimization strategy has been applied to the standard experimental strategy for ptychographic and fluorescence experiments on the Carnaúba beamline which involves the use of high-speed continuous scans (fly scans) for a fast acquisition time over large areas through the use of a newly proposed trajectory named the alternating linear trajectory. The scientific computing developments presented here target an efficient use of graphical processing units (GPUs) to the point where large fly-scan acquisitions can be processed in real time on a local high-performance computer. Some optimizations involving a custom fast Fourier transform implementation and use of mixed precision can be applied to other algorithms and phase-retrieval techniques, and therefore this work provides a general optimization scheme. Finally, the optimization strategy presented here has improved performance by a factor of ∼2.5 times faster when compared with non-optimized GPU implementations.

Inefficiencies in Motor Strategies of Horn Players with Embouchure Dystonia: Comparisons to Elite Performers

2016 ◽  
Vol 31 (2) ◽  
pp. 69-77 ◽  
Author(s):  
Peter W Iltis ◽  
Jens Frahm ◽  
Dirk Voit ◽  
Arun Joseph ◽  
Rachel Burke ◽  
...  
Keyword(s):  
High Speed ◽  
Quantitative Information ◽  
Acquisition Time ◽  
Harmonic Sequence ◽  
Movement Strategies ◽  
The Face ◽  
Magnetic Resonance Imaging Mri ◽  
Serial Images ◽  
Tongue Displacement ◽  
Motor Strategies

OBJECTIVE: Motor control of the muscles of the face, lips, and tongue of horn players has traditionally been described from externally observed phenomena. Developments in real-time, high-speed magnetic resonance imaging (MRI) extend the scope of study to include descriptive and quantitative information from within the mouth. We employed these developments to compare oral movement strategies between 12 elite horn players and 5 horn players with embouchure dystonia (ED). METHODS: Serial images with an acquisition time of 33.3 ms were obtained from each subject as they performed 6 exercises on an MRI-compatible horn: 1) a slurred ascending harmonic sequence, 2) a slurred descending harmonic sequence, 3–6) sustained high and low notes, each performed softly and loudly. Temporal changes in pixel luminescence along a series of lines positioned within the oral cavity were calculated using a customized MATLAB toolkit. This allowed the extraction of temporal line profiles for comparative analyses between elite and dystonic horn players. RESULTS: Differing motor strategies of controlling the tongue and jaw were observed during ascending and descending exercises. In ascending exercises, the elite players employed a strategy of elevation and anterior tongue displacement and elevation of the jaw, whereas dystonic players exhibited more variability in their responses. With descending exercises, both groups exhibited a lowering of the tongue and jaw, though this was more pronounced and consistent in the elite horn players. Sustained note exercises also elicited differences between groups. We suggest that elite strategies are more efficient and that the less-efficient patterns of dystonic players may exacerbate muscular tension with ED.

Small high-speed dynamic target at close range laser active imaging system

2016 ◽  
Author(s):  
Jun Yao ◽  
Du-yue Wang ◽  
Zheng Zhang ◽  
Yue Zhang ◽  
Qin Dai
Keyword(s):  
High Speed ◽  
Imaging System ◽  
Active Imaging ◽  
Close Range ◽  
Dynamic Target

Research and Application of High-Speed and Adjustable Synchronous Data Transfer System Based on USB 3.0 Peripheral Controller

2020 ◽  
pp. 2150118
Author(s):  
Junze Huang ◽  
Yueming Wang
Keyword(s):  
Transfer Rate ◽  
High Speed ◽  
Data Transfer ◽  
Hyperspectral Data ◽  
Data Block ◽  
Necessary Condition ◽  
Acquisition Time ◽  
Time Interval ◽  
Transfer System ◽  
Data Transfer Rate

Since bulk transfer bandwidth of the host is unstable, the universal serial bus (USB) 3.0 hyperspectral data transfer system can only achieve a data transfer rate of about 30 MBps which is less than one-fifteenth of USB 3.0 theoretical transfer rate of 5 Gbps. For aerial hyperspectral imager, data transfer system is required to meet different frame rates of detector for different speed-to-height ratios. In this paper, we propose a high-speed and adjustable synchronous transfer system. The USB 3.0 peripheral controller uses synchronous first in first out (FIFO) and automatic direct memory access (DMA) to achieve the highest data transfer bandwidth. The USB acquisition software collects a data block in every fixed time interval. The size in bytes of every data block must be an integer multiple of the maximum data packet payload size, which is a necessary condition for using automatic DMA and bulk transfers. The data transfer rate of the system could be adjusted by directly changing the data block size and acquisition time interval. The experimental results show that the synchronous transfer mechanism could facilitate the 100-MBps error-free and high data transfer bandwidth application on a hyperspectral data processing system.

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