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

Export:

RIS, BibTeX

Price:

$41.00

Permissions:

Request Permissions

Add to Cart

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.

307

Preparation of Piezoelectric Thick Film Actuator by Screen Printing and Wet Etching

Authors: Tomoaki Futakuchi, Yuichi Sakai, Takashi Iijima, Masatoshi Adachi

Abstract: Piezoelectric actuators were prepared by the screen printing of piezoelectric thick films and the wet etching of Si substrates for the application of ink jet printer heads. The Pt bottom electrode was used as the vibration plate to obtain a large displacement. The layer structure and integration processes of the Pt bottom electrodes were investigated to be suited to the whole preparation process of the piezoelectric actuator. The displacement of the center of the actuator with 100 μｍ x mm was 0.03 μm at the applied voltage of 30 V and frequency of 4 kHz.

Laser Diode Self-Mixing Interference Based on Phase Measurement Method

Authors: Ming Wang, Dong Mei Guo

Abstract: In order to improve the displacement measurement accuracy of the laser diode self-mixing interference (SMI), phase measurement method is introduced in the SMI signal analysis. In this paper, three modulation technique have been proposed: injection current modulation, external cavity length modulation and sinusoidal phase modulation. Measurement principle of the three modulation techinque are briefly explained. Design of the experimental system, measurement results of micro-displacement will be reported.

247

Finite Element Analysis on an Independent Variable Diameter Pile under Marine Environment

Authors: Lu Ping Yi, Jing Ji

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.

861

Study on the Dynamic Behavior of Semi-Rigid Frames

Authors: Xiu Li Sun

Abstract: The dynamic behavior of semi-rigid concrete filled steel tube frames is different from that of their rigid counterparts. ANSYS was employed to model ten-story concrete filled steel tube frames with three different connection types（ rigid, semi-rigid and flexible）. Natural period, inter-story drifts and total drifts of the frames subjected to design response spectra excitation were analyzed. Time-history analyses when the frames subjected to two different earthquakes were studied. It seems that connection flexibility noticeably increases the natural periods of the lower modes, however, its effect on higher modes is negligible. The use of rigid frames may not be the best option in seismic region. The seismic design suggestions of the frames were proposed.

864