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On Use of Semiconductor Detector Arrays on COMPASS Tokamak

Year: 2012 Volume: 6 Issue: 11 1490 - 1496 Pages

• Authors:
• V. Weinzettl
• M. Imrisek
• J. Havlicek
• J. Mlynar
• D. Naydenkova
• P. Hacek
• M. Hron
• F. Janky
• D. Sarychev
• M. Berta
• A. Bencze
• T. Szabolics

Abstract: Semiconductor detector arrays are widely used in high-temperature plasma diagnostics. They have a fast response, which allows observation of many processes and instabilities in tokamaks. In this paper, there are reviewed several diagnostics based on semiconductor arrays as cameras, AXUV photodiodes (referred often as fast “bolometers") and detectors of both soft X-rays and visible light installed on the COMPASS tokamak recently. Fresh results from both spring and summer campaigns in 2012 are introduced. Examples of the utilization of the detectors are shown on the plasma shape determination, fast calculation of the radiation center, two-dimensional plasma radiation tomography in different spectral ranges, observation of impurity inflow, and also on investigation of MHD activity in the COMPASS tokamak discharges.

• Keywords:
• Bolometry
• plasma diagnostics
• soft X-rays
• tokamak.

The Effect of Natural Light on the Performance of Visible Light Communication Systems

Year: 2012 Volume: 6 Issue: 11 1281 - 1285 Pages

• Authors:
• Mahmoud Beshr
• Ivan Andonovic
• Moustafa H. Aly

Abstract: Visible Light Communication (VLC) offers advantages of low energy consumption, licence free and RF interference free operation. One application area for VLC is in the provision of health centred services circumventing issues of interference with any biomedical device within the environment. VLC performamce is affected by natural light restricting systems avilability and relibility. The paper presents an analysis of the performance of VLC systems under different meteorological conditions. The evaluation considered the impact of natural light as a function of different reflection surfaces in different room sizes.

• Keywords:
• Visible light communication
• impulse reponse
• performance analysis
• natural light.

Optical Wireless Sensor Networks Based on VLC with PLC-Ethernet Interface

Year: 2011 Volume: 5 Issue: 9 1213 - 1216 Pages

• Authors:
• Heejin Lee
• Yeonjoo Kim
• Kyungrak Sohn

Abstract: We present a white LED-based optical wireless communication systems for indoor ubiquitous sensor networks. Each sensor node could access to the server through the PLC (Power Line Communication)-Ethernet interface. The proposed system offers a full-duplex wireless link by using different wavelengths to reduce the inter-symbol interference between uplink and downlink. Through the 1-to-n optical wireless sensor network and PLC modem, the mobile terminals send a temperature data to server. The data transmission speed and distance are 115.2kbps and about 60cm, respectively.

• Keywords:
• Visible light communications
• LED lighting
• powerline communications
• ubiquitous sensor networks
• full-duplex links