Fiber-Optic Displacement Sensor to Detect the Vibration of the Thinned U-Section by FAC

J. T. Kim et al., "Fiber-Optic Displacement Sensor to Detect the Vibration of the Thinned U-Section by FAC", Key Engineering Materials, Vols. 270-273, pp. 762-767, 2004

Online since:

August 2004

Authors:

Jung Taek Kim, Won Man Park, C.K. Lee, Seop Hur, J. Weiss, Vincent Luk, Sang J. Lee, Il Soon Hwang

Keywords:

Fac, Fiber-Optic Displacement Sensor, Stress Corrosion Cracking (SCC), Vibration Measurement

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References

[1] V. Luk, J. T. Kim, I. S. Hwang, et al. Condition Monitoring Through Advanced Sensor and Computational Technology, Proposal for the International Nuclear Energy Research Initiative, Contract Number DE-AC04-94AL85000, (2001).

[2] W. B. Spillman, Jr., B. R. Kline, L.B. Maurice, and P. L. Fuhr, Statistical-mode sensor for fiber optic vibration sensing uses, Applied Optics, Vol. 28, No. 23, 1st December (1989).

DOI: https://doi.org/10.1364/ao.28.003166

[3] G. Conforti, M. Brenci, A. Mencaglia, and A. G. Mignani, Fiber optic vibration sensor for remote monitoring in high power electric machines, Applied Optics, Vol. 28, No. 23, 1st August (1989).

DOI: https://doi.org/10.1364/ao.28.005158

[4] H.M. Hashemian, E.T. Riggsbee, et al., Advanced Instrumentation and Maintenance Technologies for Nuclear Power Plants, NUREG/CR-5501, NRC, Aug. (1998).

[5] C. B. Bahn, N. Y. Lee, S. H. Oh, B. G. Park, and I. S. Hwang, Development of Electrochemical Sensors for Condition Monitoring of Components in Nuclear Power Plants, ISOFIC-2002, Nov. (2002).

[6] Assessment of Age-Related Degradation of Structures and Passive Components for U.S. Nuclear Power Plants, NUREG/CR-6679, NRC, July (2000).

[7] Per-Anders Hansson, Goran Sandgerg, J Dynamic Finite Element Analysis of Fluid-filled Pipes, Computer methods in applied mechanics and engineering, 190(2001) 3111~3120.

DOI: https://doi.org/10.1016/s0045-7825(00)00384-4

Paper TitlePages

A Multi-Range Fiber-Optical Non-Contact Displacement Micrometer

Authors: G.J. Hwang, W.H. Ko

Abstract: A multi-fiber reflection displacement micrometer is developed. The device consists of a light source and a receiving fiber-array of identical fibers and photo detectors that detect the light reflected from the surface being measured. The differential output of each neighboring fiber pair is proportional to the surface displacement in a section of the total range. The light intensity variation of the source and the reflectance change of the surface are compensated when the differential output is divided by the summation output. A scale voltage is given to each output of neighboring fibers in order to shift each output to correspond to the actual displacement within the total range, which can be varied by selecting the number of fibers in the receiving fiber array. The micrometer offers the advantages of wide range, non-contact, no electrical interference, simplicity, and low cost. It can be used in medical experiments and laboratory instruments.

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Abstract: Research on the mechanical properties of variable diameter Independent pile under the combined action of wind, wave and flow is carried out. Taking a variable diameter Independent pile in CB11F platform of Chengdao oilfield for example, simulative analysis is performed using the finite element software ANSYS , considering the influence for some factors to structure response, that is environmental load, soil conditions and variable diameter position. The variable diameter part of the smooth gradient cone is simplified reasonably, getting the top of the displacement and the whole body stress of variable diameter pile under wave and flow actions, comparing with the result of non-variable diameter pile, the results show that the displacement and stress of variable diameter pile decrease more than 20%, the measure adopted in this paper about decreasing the displacement of independent pile and the stress of whole body is validated.

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