Distributed Fiber-Optic Sensor Using Forward Travelling Light In Polarization Maintaining Fiber

Kurosawa, Kiyoshi; Hattori, Satoshi; Yoshino, Toshihiko

doi:10.1117/12.941082

Cited by 19 publications

(8 citation statements)

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“…However, mechanical scanning is essentially needed to manipulate the coherence position. The OFDR (Optical Frequency Domain Reflectometry) method has also been applied [6]. In this way, the laser is linearly and continuously modulated in the frequency, so time delay between the two orthogonal modes induces the frequency difference in proportion to the force applied position.…”

Section: Fiber Optic Distributed Force Sensing With Pm Fibermentioning

confidence: 99%

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High-spatial-resolution fiber optic distributed force sensing with synthesis of optical coherence function

et al. 2004

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Arbitrary characteristics of optical interference have been realized, in our group, by Synthesis of Optical Coherence Function(SOCF) with electrical control and without mechanical scanning. Various applications for optical sensing have been developed by SOCF. Delta function like optical coherence function with higher spatial resolution and higher dynamic range have been achieved by using a broadband tunable super-structure-grating distributed Bragg reflector laser diode (SSG-DBR-LD). This time, we improve driving circuit and frequency calibration of the SSG-DBR-LD to achieve a 5THz tunable band width. We apply the characteristics to distributed fiber optic force sensing using polarization maintaining fiber (PMF) as a sensing head.Its principle is polarization mode coupling by the force applied to the fiber. In the experiment, we improve the spatial resolution more than one digit compared with the previous data, and realize 20cm. This technique can be used as a nerve system for smart materials and structures.

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Section: Fiber Optic Distributed Force Sensing With Pm Fibermentioning

confidence: 99%

“…By measuring polarization mode coupling caused by lateral force applied to a polarization maintaining fiber, it is possible to extract position information of the applied force [5,6,7].…”

Section: Fiber Optic Distributed Force Sensing With Pm Fibermentioning

confidence: 99%

High-spatial-resolution fiber optic distributed force sensing with synthesis of optical coherence function

et al. 2004

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“…The polarization direction of the lightwave emitted from the light source is aligned by a PC with one polarization axis of the PM fiber. When a stress is applied on the PMF at a certain of location, a part of light energy transfers to the other polarization axis of the PMF due to the polarization coupling 13,14 . The two light waves at perpendicular polarization directions are split by the polarization beam splitter (PBS).…”

Section: Distributed Fiber Optic Stress Sensing or Stress Locating $mentioning

confidence: 99%

<title>Distributed fiber optic stress sensing by synthesis of arbitrary-shaped coherence function</title>

He¹,

Hotate

2001

SPIE Proceedings

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It is demonstrated that optical coherence function can be synthesized into almost any arbitrary shape by stepwise spectral modulation of a laser source and synchronous phase modulation. In this presentation, the coherence function is synthesized experimentally into three forms, a scanning delta-function-like peak, a scanning peak with low side-lobes, and a standing triangle, respectively. The lasing frequency of a broadband tunable super-structure-grating distributed Bragg reflector laser diode (SSG-DBR-LD) is stepwise modulated. The spectral intensity is tailored with a semiconductor optical amplifier (SOA) to fit the spectral patterns required by correspondent coherence functions. The synthesized coherence functions are employed for distributed fiber optic stress sensing or stress locating. A polarization maintaining optical fiber (PMF) is used as the sensing element. When a stress is applied to the PMF, polarization mode coupling occurs; then an optical path difference between the two polarization modes appears due to their different propagation speeds. The optical path difference can be figured out by manipulating the coherence function. When using the coherence function of scanning peak, the coherence peak is moved to scan the detection range by the phase modulation; therefore, the stress distribution can be obtained. When using triangular coherence function, the detection range is set within a linear slope of the triangle, so the stress location is directly converted into the value of the coherence degree.

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“…1). These beat signals have frequencies linearly proportional to the distances between the simultaneously activated transducers f; = 6 t f S (2) …”

Section: )mentioning

confidence: 99%

“…The two channels of a dual-mode distributed fiber sensor system can either be the polarization modes of high birefringence fiber [2] or the spatial modes of a standard communication fiber supporting the LPol and LPI modes…”

Section: Polarization Modes Versus Spatial Modesmentioning

confidence: 99%

Multipoint operation of two-mode FMWC distributed fiber-optic sensor

Kotrotsios

Bénech

Parriaux

1990

J. Lightwave Technol.

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Distributed Fiber-Optic Sensor Using Forward Travelling Light In Polarization Maintaining Fiber

Cited by 19 publications

References 0 publications

High-spatial-resolution fiber optic distributed force sensing with synthesis of optical coherence function

High-spatial-resolution fiber optic distributed force sensing with synthesis of optical coherence function

<title>Distributed fiber optic stress sensing by synthesis of arbitrary-shaped coherence function</title>

Multipoint operation of two-mode FMWC distributed fiber-optic sensor

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