Bend measurement using an etched fiber incorporating a fiber Bragg grating

Rauf, Abdul; Zhao, Jianlin; Jiang, Biqiang; Jiang, Yajun; Jiang, Wei

doi:10.1364/ol.38.000214

Cited by 28 publications

(16 citation statements)

References 16 publications

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“…To achieve such features, the optical fiber sensor community has proposed a number of sensing architectures. Most of them are based on Bragg gratings [1][2][3][4][5], long-period gratings (LPGs) [6][7][8][9][10][11][12], interferometers [13][14][15][16][17][18][19], or on intensity measurements involving optical fibers [20][21][22][23].…”

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confidence: 99%

“…For example, those based on Bragg gratings exhibit low sensitivity for small angles, typically require additional reference sensors, and are not capable of distinguishing the orientation of the bending [1][2][3][4][5]. On the other hand, the performance of LPG-based bending sensors can be compromised by surrounding or packaging materials as LPGs are sensitive to the medium that envelops the optical fiber [6][7][8][9][10][11][12].…”

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confidence: 99%

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Photonic crystal fiber interferometric vector bending sensor

2015

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A compact and highly sensitive interferometric bending sensor (inclinometer) capable of distinguishing the bending or inclination orientation is demonstrated. The device operates in reflection mode and consists of a short segment of photonic crystal fiber (PCF) inserted in conventional single-mode optical fiber (SMF). A microscopic collapsed zone in the PCF-SMF junction allows the excitation and recombination of core modes, hence, to build a mode interferometer. Bending on the device induces asymmetric refractive index changes in the PCF core as well as losses. As a result, the effective indices and intensities of the interfering modes are altered, which makes the interference pattern shift and shrink. The asymmetric index changes in the PCF make our device capable of distinguishing the bending orientation. The sensitivity of our sensor is up to 1225 pm/degree and it can be used to monitor small bending angles (±2°). We believe that the attributes of our sensor make it appealing in a number of applications.

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confidence: 99%

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confidence: 99%

Photonic crystal fiber interferometric vector bending sensor

2015

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“…Recently, we demonstrated a single FBG-based bend measurement method incorporating an etched region [14]. In this paper, we extend our work on the bend loss characteristics by further studying the effect of separation between the bending region and FBG on the bend loss characteristics.…”

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confidence: 77%

High-sensitivity bend angle measurements using optical fiber gratings

2013

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We present a high-sensitivity and more flexible bend measurement method, which is based on the coupling of core mode to the cladding modes at the bending region in concatenation with optical fiber grating serving as band reflector. The characteristics of a bend sensing arm composed of bending region and optical fiber grating is examined for different configurations including single fiber Bragg grating (FBG), chirped FBG (CFBG), and double FBGs. The bend loss curves for coated, stripped, and etched sections of fiber in the bending region with FBG, CFBG, and double FBG are obtained experimentally. The effect of separation between bending region and optical fiber grating on loss is measured. The loss responses for single FBG and CFBG configurations are compared to discover the effectiveness for practical applications. It is demonstrated that the sensitivity of the double FBG scheme is twice that of the single FBG and CFBG configurations, and hence acts as sensitivity multiplier. The bend loss response for different fiber diameters obtained through etching in 40% hydrofluoric acid, is measured in double FBG scheme that resulted in a significant increase in the sensitivity, and reduction of dead-zone.

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“…160,161 Exhibiting the standard advantages of fiber technologies, FBG-based sensors are immune to EM effects, chemically inert, small-scale, lightweight, and provide electrically safe modes of operation. 162,163 A typical FBG sensor operates as a stop-band filter, where part of the light falling onto the grating is not retained but reflected. The Bragg grating is formed by a portion of the SMF core where periodic modulation is introduced in the refractive index value.…”

Section: Principle Of Operation Of Fbg Sensorsmentioning

confidence: 99%

Fiber-optic sensors for monitoring patient physiological parameters: a review of applicable technologies and relevance to use during magnetic resonance imaging procedures

Dziuda

2015

J. Biomed. Opt.

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Abstract. The issues involved with recording vital functions in the magnetic resonance imaging (MRI) environment using fiber-optic sensors are considered in this paper. Basic physiological parameters, such as respiration and heart rate, are fundamental for predicting the risk of anxiety, panic, and claustrophobic episodes in patients undergoing MRI examinations. Electronic transducers are generally hazardous to the patient and are prone to erroneous operation in heavily electromagnetically penetrated MRI environments; however, nonmetallic fiberoptic sensors are inherently immune to electromagnetic effects and will be crucial for acquiring the abovementioned physiological parameters. Forty-seven MRI-tested or potentially MRI-compatible sensors have appeared in the literature over the last 20 years. The author classifies these sensors into several categories and subcategories, depending on the sensing element placement, method of application, and measurand type. The author includes five in-house-designed fiber Bragg grating based sensors and shares experience in acquiring physiological measurements during MRI scans. This paper aims to systematize the knowledge of fiber-optic techniques for recording life functions and to indicate the current directions of development in this area.

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Bend measurement using an etched fiber incorporating a fiber Bragg grating

Cited by 28 publications

References 16 publications

Photonic crystal fiber interferometric vector bending sensor

Photonic crystal fiber interferometric vector bending sensor

High-sensitivity bend angle measurements using optical fiber gratings

Fiber-optic sensors for monitoring patient physiological parameters: a review of applicable technologies and relevance to use during magnetic resonance imaging procedures

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