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Volume 33, Issue 9
Displaying 1-11 of 11 articles from this issue
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Kentaro NAKAMURA2005 Volume 33 Issue 9 Pages 569-570
Published: September 15, 2005
Released on J-STAGE: March 26, 2014
JOURNAL FREE ACCESSDownload PDF (331K) -
High Spatial-Resolution Fiber-Optic Distributed Sensing with Synthesis of Optical Coherence FunctionKazuo HOTATE2005 Volume 33 Issue 9 Pages 571-576
Published: September 15, 2005
Released on J-STAGE: March 26, 2014
JOURNAL FREE ACCESS“Fiber optic nerve system” has became a major research subject in the field of Optical Fiber Sensors. Optical fibers act as sensor to measure distribution of strain and/or pressure along it. By embedding the fiber in structures and materials, such as buildings, bridges, aircraft fuel-tanks and pipe-lines, we can realize health monitoring function for these to develop “smart structures and smart materials.” In this paper, recent progress in “Fiber optic nerve system” is presented. Quite a high spatial resolution and measurement speed, compared with conventional ones, have recently been realized by applying a technique to synthesize shapes of optical coherence function.View full abstractDownload PDF (1883K) -
Nobuo TAKEDA, Yoji OKABE2005 Volume 33 Issue 9 Pages 577-581
Published: September 15, 2005
Released on J-STAGE: March 26, 2014
JOURNAL FREE ACCESSThe author and Hitachi Cable, Ltd. have recently developed small-diameter fiber Bragg grating (FBG) sensors in order to embed the sensors into composite laminates without strength reduction. This paper presents applications of the small-diameter FBG sensors for the detection of microscopic cracks and delamination in carbon fiber reinforced plastic (CFRP) laminates using the changes in the form of the reflection spectrum. The FBG sensors were also successfully used to monitor the thermal residual stress during the fabrication process. Furthermore, applications of small-diameter optical fiber sensors were demonstrated in a stiffened CFRP fuselage structure of 1.5m in diameter and 3m in length. The optical fiber sensors were successfully embedded into the upper panel of the fuselage, and the real-time detection system could well detect impact locations and impact-induced damages.View full abstractDownload PDF (10308K) -
Tsutomu YAMATE, Rogerio T. RAMOS, Robert J. SCHROEDER2005 Volume 33 Issue 9 Pages 582-586
Published: September 15, 2005
Released on J-STAGE: March 26, 2014
JOURNAL FREE ACCESSA large variety of sensors are used in the oil service industry for the exploration of oil and gas. These sensors should operate under sever conditions such as high temperature, high pressure, etc. Several fiber optical sensors have been used in the oil field industry and new fiber optical sensors are under research and development. Applications where fiber optical sensors have been successfully used and the fiber optics pressure sensors with small temperature, pressure cross sensitivity for this industry will be reviewed.View full abstractDownload PDF (3770K) -
Hideaki IWAKI2005 Volume 33 Issue 9 Pages 587-591
Published: September 15, 2005
Released on J-STAGE: March 26, 2014
JOURNAL FREE ACCESSApplications of Fiber Bragg Grating (FBG) sensor in building and civil infrastructure are reviewed. In Japan, subsequent to the Kobe earthquake and the “Shinkansen” tunnel accident, research and development of sensing system for building and civil infrastructure is being actively pursued. FBG sensor is considered to be promising sensor in this regard due to its high efficiency in these applications. As an example, FBG sensors installed on an actual building is illustrated. In addition, the problems currently faced are discussed and examined.View full abstractDownload PDF (11053K) -
Kiyoshi KUROSAWA2005 Volume 33 Issue 9 Pages 592-597
Published: September 15, 2005
Released on J-STAGE: March 26, 2014
JOURNAL FREE ACCESSThis paper describes development of optical fiber current sensors along with some of their applications. Optical fiber current sensors based on the Faraday effect have long been expected to replace conventional current transformers as compact and high performance current sensors. Yet because they require complex means for achieving stable characteristics, this type of sensor has never come into widespread practical use. To solve these problems we developed a special sensor fiber made from flint glass and created sensor systems whose sensing method ideally matches the characteristics of the fiber. These sensors we developed are immune to environmental effects such as vibration and temperature changes. They are also compact and flexible, and attach easily around conductors. This paper also introduces some typical applications of these sensors including cable current measurement using a portable type sensor, a fault section locating system for power transmission lines using these sensors, and sensor applications to protective relay systems as verified in field tests.View full abstractDownload PDF (9435K) -
Aritaka OHNO2005 Volume 33 Issue 9 Pages 598-602
Published: September 15, 2005
Released on J-STAGE: March 26, 2014
JOURNAL FREE ACCESSPractical applications of the Interferometer Fiber Optic Gyroscope (IFOG) have been started. This paper reviews the principal, configuration and applications of IFOG, and describes recent progress of the IFOG developments.View full abstractDownload PDF (5960K) -
Kotaro KAJIKAWA2005 Volume 33 Issue 9 Pages 603-608
Published: September 15, 2005
Released on J-STAGE: March 26, 2014
JOURNAL FREE ACCESSWe have developed a highly sensitive optical fiber biosensor based on localized surface plasmon resonance. The sensor probe is constructed at an endface of the multimode optical fiber whose core diameter is 50pm, so that the effective surface area of the probe is about 0.002 mm2. It has the following advantages to the conventional biosensors:(a) it is easy to handle, (b) it enables us to probe a small amounts of samples<10μL, (c) label-free, and (d) low cost. This sensor has the highest resolution of 10-5 in refractive index, which corresponds to an adsorption amount of 10pg/mm2 on the probe surface. This value is similar to that of the conventional surface plasmon resonance biosensors that use an attenuated total reflection geometry.View full abstractDownload PDF (3790K) -
Yoshitaka ENOMOTO, Hisashi IZUMITA, Minoru NAKAMURA2005 Volume 33 Issue 9 Pages 609-614
Published: September 15, 2005
Released on J-STAGE: March 26, 2014
JOURNAL FREE ACCESSThis paper describes a highly developed fiber fault isolation technique that can distinguish a fault in branched optical fibers in passive optical network (PONs). This technique provides a promising way of extending the functions of the conventional optical fiber testing and monitoring system. We demonstrate an optical fiber line testing and monitoring system with a high dynamic range that employs a high spatial resolution OTDR (HOTDR) and highly reflective fiber Bragg grating (FBG) filters installed in the front of ONUs on the customers' premises. We also describe a cost effective fiber fault isolation technique that employs frequency domain analysis. These techniques enable us to isolate a fiber fault, reduce maintenance costs and improve service reliability.View full abstractDownload PDF (1146K) -
Yoshihiko MATSUOKA, Takashi INOUE, Yuko KIZUKA, Makoto YAMAUCHI, Shing ...2005 Volume 33 Issue 9 Pages 615-619
Published: September 15, 2005
Released on J-STAGE: March 26, 2014
JOURNAL FREE ACCESSAxially condensed beams exhibit properties suitable for laser micro-fabrication. The influence of axicon tilt was examined when an axially condensed beam was formed using an axicon. For both types of axicons, conical shape glass lens and binary diffractive optical element (DOE), the ideal axially condensed beam profile is kept below a tilt angle of less than about 5 °. The beam generation using an axicon does not need precise alignment. However, with the conical shape glass axicon, the symmetry axis of the cone and the undersurface should be orthogonal within an angle error margin of 1', for axially condensed beam generation. This is the first report to present laser drill performance using a DOE axicon.View full abstractDownload PDF (9796K) -
Yoshiaki SHIMOMURA, Tatsuo OKADA2005 Volume 33 Issue 9 Pages 620-625
Published: September 15, 2005
Released on J-STAGE: March 26, 2014
JOURNAL FREE ACCESSA new measurement technique based on three near-infrared laser diodes is proposed for non-destructive evaluation of sugar content in fruits. A parameter γ, which is independent of the optical path length is considered, such that γ=ln (Ri/Rk)/ln (Ri/Rk), where the values of reflectance Ri, j, k represent the ratio of values of diffuseli ght power reaching to two receiving fibers corresponding to different wavelengths λi, j, k.Based on a simulation with a modeled-apple, it was found that there are optimum combinations among three wavelengths for which the correlation between the parameter γ and the sugar content of fruit becomes sufficiently high. The sugar content of apples was also measured experimentally with an accuracy of 0.63 Brix, by employing three laser diodes with wavelengths of 911, 936 and 1055 nm. The measurements clearly show the usefulness of the proposed technique.View full abstractDownload PDF (1103K)
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