Showing posts from September, 2010

IBM breakthrough could measure rapid changes to atoms


Efficiency of LabVIEW application

Currently, I'm facing the problem of LabVIEW execution efficient. Thus, I found a book which simply can help my programming skills in LabVIEW and eventually can solve my problems. ^^ The following notes are written by P. A. Blume , The LabVIEW Style Book    An efficient LabVIEW application executes quickly, without performing unnecessary operations, particularly ones that are performed repeatedly within looping structures. An efficient application also conserves memory by limiting the size of the four LabVIEW memory components: the front panel, block diagram, data space, and code. Front panel and block diagram memory store the graphical objects and images that comprise the front panel and block diagram, respectively. Data space memory contains all the data that flows through the diagram, as well as the diagram constants, default values for front panel controls, and the data that is copied when written to variables and front panel indicators. Code is the portion of memory that

Design of Fiber Bragg Grating Acoustic Sensor for Structural Health Monitoring of Nuclear Power Plant

Jung-Ryul Lee 1, a See Yenn Chong 1, b , Chang Yong Y u n 1 ,c , Hoon Sohn 2 , d 1 Dept. of Aerospace Engineering, Chonbuk National University, 664-14 Duckjin-dong, Duckjin-gu, Jeonju, Chonbuk, 561-756, Republic of Korea 2 Dept. of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology, 335 Gwahangno, Yuseong-gu, Daejon, Korea a, b , c ch yun0207 @ nate .com , d Keywords: Structural health monitoring, Nuclear power plant, Metal-coated optical fiber, Fiber Bragg grating acoustic sensor Abstract. Nuclear power plant (NPP) is commonly categorized as a harsh environment that gives rise age-related degradation on the structures of plant and eventually leads to radiation leakage that threatens to human. Integrated structural health monitoring (ISHM) technology is a strong candidate for NPP accidents. The emergence of optical fiber technology into SHM system for NPP was greatly intere

A lasing wavelength stabilized simultaneous multipoint acoustic sensing system using pressure-coupled fiber Bragg gratings

Jung-Ryul Lee a , , , See Yenn Chong a , Chang-Yong Yun a and Dong-Jin Yoon b a Department of Aerospace Engineering, Chonbuk National University, 664-14 Duckjin-dong, Duckjin-gu, Jeonju, Chonbuk 561-756, Republic of Korea b Safety Measurement Center, Korea Research Institute of Standards and Science, 209 Gajeong-ro Yuseong-gu, Daejeon, Republic of Korea Received 5 June 2010; revised 17 July 2010; accepted 15 August 2010. Available online 30 August 2010. Abstract A fiber Bragg grating (FBG) sensor head, using a pressure coupling mechanism, was designed for broadband frequency response and structural strain-free characteristic. The pressure-coupled sensor heads were connected to a simultaneous multipoint acoustic sensing system based on a tunable laser. An intelligent lasing wavelength stabilization algorithm capable of identifying the direction of spectrum movement, the wavelength shifting speed, and a fiber bending event was developed so that the simultaneo

This is our future: Wireless electricity