Share Email Print
cover

Proceedings Paper

In-situ strain monitoring in liquid containers of LNG transporting carriers
Author(s): Min-Cheol Oh; Jun-Kyu Seo; Kyung-Jo Kim; Sang-Min Lee; Myung-Hyun Kim
Format Member Price Non-Member Price
PDF $14.40 $18.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

Liquefied natural gas (LNG) transport carriers are exposed to a risk by the repeated bump in the LNG container during the vessel traveling over the wave in ocean. The liquid inside the container, especially when it was not fully contained, make a strong bump onto the insulation panel of the tank wall. The insulation panel consists of several layers of thick polyurethane foam (PUF) to maintain the LNG below the cryogenic temperature, -162°C. Due to the repeated shock on the PUF, a crack could be developed on the tank wall causing a tremendous disaster for LNG carriers. To prevent the accidental crack on the tank, a continuous monitoring of the strain imposed on the PUF is recommended. In this work, a fiber-optic Bragg grating was imbedded inside the PUF for monitoring the strain parallel to the impact direction. The optical fiber sensor with a small diameter of 125 μm was suitable to be inserted in the PUF through a small hole drilled after the PUF was cured. In-situ monitoring of the strain producing the change of Bragg reflection wavelength, a high speed wavelength interrogation method was employed by using an arrayed waveguide grating. By dropping a heavy mass on the PUF, we measured the strain imposed on the insulation panel.

Paper Details

Date Published: 3 September 2008
PDF: 8 pages
Proc. SPIE 7070, Optical Technologies for Arming, Safing, Fuzing, and Firing IV, 70700X (3 September 2008); doi: 10.1117/12.795793
Show Author Affiliations
Min-Cheol Oh, Pusan National Univ. (Korea, Republic of)
Jun-Kyu Seo, Pusan National Univ. (Korea, Republic of)
Kyung-Jo Kim, Pusan National Univ. (Korea, Republic of)
Sang-Min Lee, Pusan National Univ. (Korea, Republic of)
Myung-Hyun Kim, Pusan National Univ. (Korea, Republic of)


Published in SPIE Proceedings Vol. 7070:
Optical Technologies for Arming, Safing, Fuzing, and Firing IV
Fred M. Dickey; Richard A. Beyer, Editor(s)

© SPIE. Terms of Use
Back to Top