Micro-Displacement Sensor Using a Curved Two-Core Optical Fiber

Serpa, Claudia M.; Torres, Pedro; Margulis, Walter

doi:10.1364/ofs.2006.the37

Cited by 4 publications

(3 citation statements)

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“…Recently several kinds of fiber-based displacement sensors have been proposed and demonstrated. A micro-displacement sensor using a special two-core optical fiber (TCOF) was recently demonstrated [1]. In this configuration the TCOF is spliced between two single mode fibers (SMF) in order to form a Mach-Zehnder interferometer.…”

Section: Introductionmentioning

confidence: 99%

All-fiber multimode interference micro-displacement sensor

Antonio-López¹,

LiKamWa²,

Sánchez-Mondragón³

et al. 2013

Meas. Sci. Technol.

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We report an all-fiber micro-displacement sensor based on multimode interference (MMI) effects. The micro-displacement sensor consists of a segment of No-Core multimode fiber (MMF) with one end spliced to a segment of single mode fiber (SMF) which acts as the input. The other end of the MMF and another SMF are inserted into a capillary ferrule filled with index matching liquid. Since the refractive index of the liquid is higher than that of the ferrule, a liquid MMF with a diameter of 125 μm is formed between the fibers inside the ferrule. When the fibers are separated this effectively increases the length of the MMF. Since the peak wavelength response of MMI devices is very sensitive to changes in the MMF's length, this can be used to detect micro-displacements. By measuring spectral changes we have obtained a sensing range of 3 mm with a sensitivity of 25 nm mm −1 and a resolution of 20 μm. The sensor can also be used to monitor small displacements by using a single wavelength to interrogate the transmission of the MMI device close to the resonance peak. Under this latter regime we were able to obtain a sensitivity of 7000 mV mm −1 and a sensing range of 100 μm, with a resolution up to 1 μm. The simplicity and versatility of the sensor make it very suitable for many diverse applications.

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Section: Introductionmentioning

confidence: 99%

All-fiber multimode interference micro-displacement sensor

Antonio-López¹,

LiKamWa²,

Sánchez-Mondragón³

et al. 2013

Meas. Sci. Technol.

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“…In general, in most intrinsic fiber sensors the displacement produces a deformation which bends the sensible portion of the fiber, thus affecting the optical transmission properties of the fiber. The sensible portion of the fiber may consist of fiber Bragg gratings [ 8 , 9 ], long-period fiber gratings [ 10 ], two-core fibers [ 11 ], single mode fibers with high bend loss at the measurement wavelength [ 12 ], tapered fibers [ 13 – 15 ], among others. In reference [ 11 ], an intrinsic micro-displacement sensor based on a two core fiber is proposed, where the sensitivity depends on the bending deformation suffered by multiple fiber loops.…”

Section: Introductionmentioning

confidence: 99%

“…The sensible portion of the fiber may consist of fiber Bragg gratings [ 8 , 9 ], long-period fiber gratings [ 10 ], two-core fibers [ 11 ], single mode fibers with high bend loss at the measurement wavelength [ 12 ], tapered fibers [ 13 – 15 ], among others. In reference [ 11 ], an intrinsic micro-displacement sensor based on a two core fiber is proposed, where the sensitivity depends on the bending deformation suffered by multiple fiber loops. In [ 12 ] an ultrasensitive intrinsic fiber sensor based on the macrobending loss at 1.55 μm in a single-mode fiber with wavelength cutoff around 1,060 nm was demonstrated.…”

Section: Introductionmentioning

confidence: 99%

An Intrinsic Fiber-Optic Single Loop Micro-Displacement Sensor

Martı́nez-Rios

Monzón-Hernández

Torres-Gómez

et al. 2012

Sensors

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A micro-displacement sensor consisting of a fiber-loop made with a tapered fiber is reported. The sensor operation is based on the interaction between the fundamental cladding mode propagating through the taper waist and higher order cladding modes excited when the taper is deformed to form a loop. As a result, a transmission spectrum with several notches is observed, where the notch wavelength resonances shift as a function of the loop diameter. The loop diameter is varied by the spatial displacement of one end of the fiber-loop attached to a linear translation stage. In a displacement range of 3.125 mm the maximum wavelength shift is 360.93 nm, with 0.116 nm/μm sensitivity. By using a 1,280 nm broadband low-power LED source and a single Ge-photodetector in a power transmission sensor setup, a sensitivity in the order of 2.7 nW/μm is obtained in ∼1 mm range. The proposed sensor is easy to implement and has a plenty of room to improve its performance.

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