Self-adaptive sampling rate data acquisition in JET’s correlation reflectometer

de Arcas, G.; López, J. M.; Ruiz, M.; Barrera, E.; Vega, J.; Murari, A.; Fonseca, A.; JET-EFDA Contributors
October 2008
Review of Scientific Instruments;Oct2008, Vol. 79 Issue 10, p10F336
Academic Journal
Data acquisition systems with self-adaptive sampling rate capabilities have been proposed as a solution to reduce the shear amount of data collected in every discharge of present fusion devices. This paper discusses the design of such a system for its use in the KG8B correlation reflectometer at JET. The system, which is based on the ITMS platform, continuously adapts the sample rate during the acquisition depending on the signal bandwidth. Data are acquired continuously at the expected maximum sample rate and transferred to a memory buffer in the host processor. Thereafter the rest of the process is based on software. Data are read from the memory buffer in blocks and for each block an intelligent decimation algorithm is applied. The decimation algorithm determines the signal bandwidth for each block in order to choose the optimum sample rate for that block, and from there the decimation factor to be used. Memory buffers are used to adapt the throughput of the three main software modules (data acquisition, processing, and storage) following a typical producer-consumer architecture. The system optimizes the amount of data collected while maintaining the same information. Design issues are discussed and results of performance evaluation are presented.


Related Articles

  • Adaptive sampling method for inspection planning on CMM for free-form surfaces. Yu, Mingrang; Zhang, Yingjie; Li, Yunlong; Zhang, Ding // International Journal of Advanced Manufacturing Technology;Aug2013, Vol. 67 Issue 9-12, p1967 

    Coordinate measurement machines (CMMs) have been widely used in inspecting mechanical parts with higher accuracy. Both the distribution and the number of the sampled points on measurand have an important effect on the efficiency and quality of the measurement of CMMs. In this paper, an adaptive...

  • Systematic and routine analysis of radial correlation reflectometry data in JET. Figueiredo, António C. A.; Fonseca, António; Meneses, Luís; JET-EFDA Contributors // Review of Scientific Instruments;Oct2008, Vol. 79 Issue 10, p10F107 

    This paper discusses a tool specially developed for the analysis of radial correlation reflectometry data in JET. The tool, which calculates the correlation length and coherent reflection from the raw data, has been designed for offline analysis and to assist diagnostic operators. After being...

  • Learning noisy linear classifiers via adaptive and selective sampling. Cavallanti, Giovanni; Cesa-Bianchi, Nicol�; Gentile, Claudio // Machine Learning;Apr2011, Vol. 83 Issue 1, p71 

    We introduce efficient margin-based algorithms for selective sampling and filtering in binary classification tasks. Experiments on real-world textual data reveal that our algorithms perform significantly better than popular and similarly efficient competitors. Using the so-called Mammen-Tsybakov...

  • A correlation-based ant miner for classification rule discovery. Baig, Abdul; Shahzad, Waseem // Neural Computing & Applications;Mar2012, Vol. 21 Issue 2, p219 

    In recent years, a few sequential covering algorithms for classification rule discovery based on the ant colony optimization meta-heuristic (ACO) have been proposed. This paper proposes a new ACO-based classification algorithm called AntMiner-C. Its main feature is a heuristic function based on...

  • An Effective Mining Algorithm for Weighted Association Rules in Communication Networks. Wu Jian; Li Xing ming // Journal of Computers;Oct2008, Vol. 3 Issue 10, p20 

    The mining of weighted association rules is one of the primary methods used in communication alarm correlation analysis. With large communication alarm database, the traditional methods often treated each item evenly that makes the process of mining association rules time consuming. To improve...

  • High Secure Communication using Chaotic Double CompressionSteganography Technique. Toosizadeh, Saeeid; Farshchi, Seyyed Mohammad Reza // International Journal of Research & Reviews in Computer Science;Mar2011, Vol. 2 Issue 2, p527 

    In this paper, we propose a fractal based approach for hiding sensitive information in a cover image (including artificially generated fractal images). We considered a process of permutation, followed by a diffusion algorithm. For the correlation analysis, we evaluate the behavior of two...

  • A Design and Development of Word Sense Disambiguation Algorithm for English Language Understanding for Database Access. Munusamy, M.; Arasu, G. Tholkappia; Palanisamy, V.; Selvarajan, S. // Journal of Computer Science;2011, Vol. 7 Issue 10, p1612 

    Problem statement: This study attempts to present an object-net method for word sense disambiguation. It is proposed to model the elementary meanings which assist the machine to autonomously undertake the analysis and synthesis processes of meaning. Approach: In the proposed methodology, the...

  • Application to Three-Dimensional Canonical Correlation Analysis for Feature Fusion in Image Recognition. Xiaogang Gong; Jiliu Zhou; Huilin Wu; Gang Lei; Xiaohua Li // Journal of Computers;Nov2011, Vol. 6 Issue 11, p2427 

    This paper presents a three-dimensional canonical correlation analysis (TCCA) method, and applies it to feature fusion for image recognition. It is an extension of traditional canonical correlation analysis (CCA) and two-dimensional canonical correlation analysis (2DCCA). Considering two views...

  • Performance Analysis for Distributed Fusion with Different Dimensional Data. Xianghui Yuan; Zhansheng Duan; Chongzhao Han // Mathematical Problems in Engineering;2014, p1 

    Different sensors or estimators may have different capability to provide data. Some sensors can provide a relatively higher dimensional data, while other sensors can only provide part of them. Some estimators can estimate full dimensional quantity of interest, while others may only estimate part...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics