Demonstration of a passive subpicostrain fiber strain sensor

Chow, J. H.; McClelland, D. E.; Gray, Malcolm B.; Littler, Ian C. M.

doi:10.1364/ol.30.001923

Cited by 100 publications

(52 citation statements)

References 12 publications

(13 reference statements)

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“…In many fiber-based systems, such as interferometric fiber-optic sensors [1][2][3][4] , fiber lasers [5][6][7] , and fiber-delay-line stabilized lasers 8 , the fundamental resolution or frequency stability is limited by the intrinsic thermal noise inside optical fibers. Thus, an experimental and theoretical understanding of the thermal noise in optical fibers is important.…”

mentioning

confidence: 99%

Observation of fundamental thermal noise in optical fibers down to infrasonic frequencies

Dong

Huang

et al. 2016

Applied Physics Letters

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The intrinsic thermal noise in optical fibers represents the ultimate limit for fiber-based systems. However, at infrasonic frequencies, the spectral behavior of the intrinsic thermal noise is still unclear. In this letter, we present measurements of the fundamental thermal noise in optical fibers that are obtained using a balanced fiber Michelson interferometer. When an ultra-stable laser is used as the laser source and other noise sources are carefully controlled, the 1/f spectral density of the thermal noise is observed down to infrasonic frequencies, and the measured magnitude is consistent with the results of theoretical predictions at frequencies over the range from 0.2 Hz to 20 kHz. Moreover, as observed experimentally, the level of the 1/f thermal noise can be reduced by changing the coatings of the optical fibers. This therefore indicates one possible way to reduce thermal noise in optical fibers at low Fourier frequencies. Finally, the inconsistency between the experimental data and the existing theory for thermomechanical noise is discussed.

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mentioning

confidence: 99%

Observation of fundamental thermal noise in optical fibers down to infrasonic frequencies

Dong

Huang

et al. 2016

Applied Physics Letters

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“…This result leads us to conlcude that the cross sectional area of a POF is equal with the intensity of that POF. That is, the light energy distribution is 1 Il-Bum Kwon 1 Chi-Yeop Kim Chan-Wook Shim Dusun Hwang Yungjoo Chung homogenous over the cross sectional area of the POF. We can calculate the transmission light intensity by determining the area of the light beam passing through the blocker.…”

Section: Formulation Of Transmission Light Intensity Of Hole Blockersmentioning

confidence: 99%

“…Compared with conventional electrical strain gages, fiber optic strain sensors have many advantages, such as electro-magnetic immunity and resistance to chemical corrosion. Therefore, in the past few years, there has been intense works on the development of fiber optic strain sensors [1][2][3][4]. These most of the developed sensors are very sensitive in measuring strain.…”

Section: Introductionmentioning

confidence: 99%

Analytic Formulation of Transmission Light Intensity of Hole Blockers in Intensity-based Polymer Optical Fiber Sensors

Kwon¹,

Kim²,

Shim³

et al. 2011

Journal of Sensor Science and Technology

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Intensity-based optical fiber sensors are devised using a blocker which is located between two polymer optical fibers(POFs), one fiber is light-in and the other is light-out. This blocker is moved by an external displacement. Therefore, finding a general formulation of the relation between this displacement and transmission light intensity of various blockers is important to help develop intensity-based optical fiber sensors. In this paper, we consider blockers with arbitrary shapes from circular holes to inclined angled blockers. The transmission light intensities of such blockers should be determined by this generalized equation. In order to verify this equation, the calculated intensities of the blockers are compared with the values acquired from experiment. In the comparison, it is shown that the analytic equation can give the exact values of the transmitted light intensities for the assorted blockers. The range of the displacement measurement is also shown to be about 6 times of the radius of the hole in the case of a 9 degree inclined angle blocker.

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“…A number of high-resolution FBG strain sensors based on complex structures have been developed, including Fabry-Perot configuration [8,9], π-phase shifted gratings [10,11] chirped gratings [12], and sampled structures [13]. For instance, Gagliardi et al demonstrated a strain measurement at the 10 −13 ε·Hz −1/2 scale using an FBG resonator with a diode-laser source which is stabilized against quartz-disciplined optical frequency comb [1]; Huang et al proposed a static-strain sensor with a resolution of 1.0 nε based on a π-phase-shifted Bragg grating, combined with a wavelet threshold denoising algorithm [11].…”

Section: Introductionmentioning

confidence: 99%

An Embeddable Strain Sensor with 30 Nano-Strain Resolution Based on Optical Interferometry

et al. 2018

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Abstract:A cost-effective, robust and embeddable optical interferometric strain sensor with nanoscale strain resolution is presented in this paper. The sensor consists of an optical fiber, a quartz rod with one end coated with a thin gold layer, and two metal shells employed to transfer the strain and orient and protect the optical fiber and the quartz rod. The optical fiber endface, combining with the gold-coated surface, forms an extrinsic Fabry-Perot interferometer. The sensor was firstly calibrated, and the result showed that our prototype sensor could provide a measurement resolution of 30 nano-strain (nε) and a sensitivity of 10.01 µε/µm over a range of 1000 µε. After calibration of the sensor, the shrinkage strain of a cubic brick of mortar in real time during the drying process was monitored. The strain sensor was compared with a commercial linear variable displacement transducer, and the comparison results in four weeks demonstrated that our sensor had much higher measurement resolution and gained more detailed and useful information. Due to the advantages of the extremely simple, robust and cost-effective configuration, it is believed that the sensor is significantly beneficial to practical applications, especially for structural health monitoring.

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Demonstration of a passive subpicostrain fiber strain sensor

Cited by 100 publications

References 12 publications

Observation of fundamental thermal noise in optical fibers down to infrasonic frequencies

Observation of fundamental thermal noise in optical fibers down to infrasonic frequencies

Analytic Formulation of Transmission Light Intensity of Hole Blockers in Intensity-based Polymer Optical Fiber Sensors

An Embeddable Strain Sensor with 30 Nano-Strain Resolution Based on Optical Interferometry

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