An Extended Fibre Optic Stress Location Sensor

Franks, R.B.; Torruellas, William E.; Youngquist, Robert C.

doi:10.1080/713821917

Cited by 4 publications

(2 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…& L[LLc C (2) 376 Another significant part of the proposed fiber is "isolation foot" that separates central parabola from Si02 (cladding) level. This is important, if light is to be coupled from central to side parabolas by microbends.…”

Section: The Basic Theory Of Optical Fiber For Dispersion Addressing mentioning

confidence: 99%

See 1 more Smart Citation

<title>Novel distributed fiber optic microbend sensor structure based on dispersion addressing</title>

1999

View full text Add to dashboard Cite

This paper presents novel fully distributed forward propagating system, suitable for use with microbend sensors. The presented principle bases on selective launch of modes in specially designed multimode fiber called OFDA (Optical Fiber for Dispersion Addressing). At the input of the OFDA fiber short, pulse is launched in fundamental mode. In presence of microbend disturbance located down the sensing fiber, light couples from fundamental to higher order modes that propagate at different group velocity as fundamental mode. The position of measurand is then determined on the basis of time delay between pulse carried by fundamental mode and by pulse carried by higher order modes. The difference of group velocities is maximized by proper construction of refractive index of the OFDA fiber profile. Experimentally produced fibers exhibited difference of group velocities in range over 1%. This allows for easy reconstruction ofposition and amplitude of microbend deformations located down the sensing fiber.

show abstract

Section: The Basic Theory Of Optical Fiber For Dispersion Addressing mentioning

confidence: 99%

“…Recent interest was focused on the application of various forward propagating-systems. Early work was based on group time delay between two modes propagating in two mode or HB fibers [2]. This method proved to be useful only when one single disturbance was placed along the sensing fiber.…”

Section: Introductionmentioning

confidence: 99%

<title>Novel distributed fiber optic microbend sensor structure based on dispersion addressing</title>

1999

View full text Add to dashboard Cite

show abstract

Optical fiber for dispersion addressing

Đonlagić

Culshaw

2000

Applied Physics Letters

View full text Add to dashboard Cite

This letter presents a fully distributed forward propagating system, suitable for use with microbend sensors. The principle relies on selected mode launch in specially designed multimode fiber where a short pulse is launched into the fundamental mode. In the presence of microbend disturbance located down the sensing fiber, light couples from the fundamental to higher-order modes that propagate at different group velocity than the fundamental mode. The position of the disturbance is determined by the time delay between the pulse carried by the fundamental mode and by the pulse carried by higher-order modes. The group velocity difference is maximized by proper construction of the refractive index profile of the proposed fiber. Experimentally produced fibers exhibited difference of group velocities in ranges over 1%. This allows for easy reconstruction of position and amplitude of microbend deformations located down the sensing fiber.

show abstract

Reflectometric frequency-modulation continuous-wave distributed fiber-optic stress sensor with forward coupled beams

1996

View full text Add to dashboard Cite

A distributed optical-fiber stress sensor whose principle of operation is based on the frequency-modulation continuous-wave technique is reported. The sensor consists of a length of birefringent fiber with a mirror attached to one end, a diode laser, and a p-i-n photodiode detector. The intensity and the location of an applied stress are determined simultaneously by detecting the amplitude and the frequency of the beat signal, which is produced by two forward-coupled mode beams. The system was found to have a reasonable spatial resolution of 0.85 m (rms error) in a sensing range of 100 m. The advantages and limitations of the sensor are also discussed.

show abstract

An Extended Fibre Optic Stress Location Sensor

Cited by 4 publications

References 15 publications

<title>Novel distributed fiber optic microbend sensor structure based on dispersion addressing</title>

<title>Novel distributed fiber optic microbend sensor structure based on dispersion addressing</title>

Optical fiber for dispersion addressing

Reflectometric frequency-modulation continuous-wave distributed fiber-optic stress sensor with forward coupled beams

Contact Info

Product

Resources

About