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Saturday, April 18, 2020 | History

4 edition of Strain sensing using optical fibers found in the catalog.

Strain sensing using optical fibers

Strain sensing using optical fibers

final report

by

  • 265 Want to read
  • 40 Currently reading

Published by Center for Manufacturing Research and Technology Utilization, National Aeronautics and Space Administration in Cookeville, Tenn, [Washington, DC .
Written in English

    Subjects:
  • Bend tests,
  • Fiber optics,
  • Light transmission,
  • Optical fibers,
  • Strain gages,
  • Strain measurement,
  • Wave attenuation

  • Edition Notes

    StatementRichard Houghton, Steven Hiles.
    Series[NASA contractor report] -- NASA CR-195807.
    ContributionsHiles, Steven., United States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL14667876M
    OCLC/WorldCa32054212

    ON THE GAGE FACTOR FOR OPTICAL FIBER GRATING STRAIN GAGES Richard J. Black1, David Zare1, Levy Oblea1, Yong-Lae Park1, Behzad Moslehi1, and Craig Neslen2 1Intelligent Fiber Optic Systems Corporation (IFOS) Calle Del Mundo, Santa Clara, CA 2AFRL/RXLP, 10th Street Building , Wright Patterson AFB, OH ABSTRACTFile Size: 1MB. Two FP Strain Gauges were mounted onto oppo - site faces of a " × " steel bar, and two Model VW Strain Gauges onto the two remaining faces. The bar was then subjected to incremental loads and the strain values recorded at each increment. Concrete Cylinder Compression Load Test Tests were carried out on a FP Strain Gauge embed -File Size: KB. There are many technologies, but commercial solutions really boil down to two main categories: point sensing for which the active portion of the fiber is. Pressure sensing was studied using a cylindrical metal post placed on an array of points across the skin. The polymer fibre grating exhibits approximately 10 times the pressure sensitivity of the silica fibre and responds to the post even when it is placed a few centimetres away from the sensing fibre. van Steenberge, G. ; Peng, G.-D Cited by: 6.


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Strain sensing using optical fibers Download PDF EPUB FB2

Abstract. This chapter is focused on the theory and opto-mechanical modeling of fiber Bragg gratings (FBGs). The chapter includes the opto-mechanical properties of optical fibers, induced optical anisotropy in optical fibers caused by temperature and structural loading, light propagation in optically anisotropic optical fibers, and the coupled-mode theory of the spectral response of FBGs.

Strain Sensing Using Carbon Fiber and an epoxy-matrix composite with continuous carbon fibers (58 vol%) are strain sensors with fractional change in resistance per unit strain up to   For embedding optical fibers in samples prepared by both the hand—layup and the pre-preg layup methods the process is similar as follows: before the curing process optical fibers are placed on the corresponding composite layer and some pre-strain is applied to make sure the optical fibers remain free of bends.

Positioning of the optical Cited by: strain and accomplished distributed strain sensing based on dye-doped hydrogel fibers with a large dynamic strain range. Light guiding is achieved by total internal reflection at the interface between the core and clad, for which the refrac-tive index of the core should be larger than that of the clad.

We characterized the optical properties of. Distributed strain measurements were recorded on all four optical sensing fibers and single point strain was recorded on one resistive strain gage during static cantilever load testing. As mentioned above, in the initial configuration the beam was oriented with embedded warp, embedded fill, and surface warp-direction sensing fibersFile Size: 1MB.

chapter 5 distributed brillouin sensing using polymer optical fibers Experimental Setup The fi ber under test was a 1-m- long PFGI POF with a core di am. The UC began using CNT thread as a damage and strain sensing element in the – time frame. Several proof-of-concept experiments were done with the CNT thread, and one of the first experiments was embedding the thread into an epoxy beam, which was strained in a four-point bending test rig [48].

A fiber-optic sensor is a sensor that uses optical fiber either as the sensing element ("intrinsic sensors"), or as a means of relaying signals from a remote sensor to the electronics that process the signals ("extrinsic sensors").

Fibers have many uses in remote sensing. Depending on the application, fiber may be used because of its small size, or because no electrical power is needed at the. The discovery of lasers in the s and development of low loss silica optical fiber opened a new era of fiber optic sensors.

Intrinsic insensitivity to electromagnetic interference (EMI), remote detection, operational ability in hazardous environment, and potential for distributed sensing make them especially useful for monitoring large nuclear infrastructures such as coolant monitoring Author: Sanjay Kher, Manoj Kumar Saxena.

Strain distributions were obtained from optical fibers arranged in three different configurations on transversely-loaded cantilevered beams.

Traditional strain measurement sensors, such as strain gauges, are limited to measuring strain at discrete points on a structural member. However, distributed optical fibers can measure high spatial (Cited by: 1.

Optical Fiber Strain Sensing in Engineering Mechanics. Bilodeau, J. Albert, D. Johnson, K. Hill, Y. Hibino, M. Abe: Strain sensing using optical fibers book in Strain sensing using optical fibers book Fibers and Silica-on-Substrate Field Monitoring of the Ice Load of an Icebreaker Propeller Blade Using Fibre Optic Strain Gauges, in: Smart Sensing, Processing, and Cited by: 8.

An Evaluation of Optical Fiber Strain Sensing for Engineering Applications Douglas Alan Harold ABSTRACT A fatigue test has been performed on T aluminum specimens which were bonded with polyimide coated optical fibers with discrete Bragg gratings.

These fibers were bonded with AE strain gage adhesive. 5 Specifications 1 2 channels or 4 channels are provided within the sensor unit. Additional channels can be added by using an external optical switch. 2 This value is estimated/calculated from the uncertainty of laser beat frequency, 5 kHz, and temperature and strain coefficients of fibers.

3 Adaptors and patch cords are available for mating with other types of optical Size: 1MB. Monitoring of geotechnical structures using distributed Brillouin sensors embedded in geotextiles. The use of stimulated Brillouin scattering (SBS) for distributed measurement of temperature and strain was already demonstrated 20 years ago[].The SBS is the most dominant nonlinear effect in single-mode silica fibers and can be described as a three-wave-interaction of two contra-propagating Cited by: Brillouin distributed optical fiber sensing (Brillouin D-FOS) is a powerful technology for real-time in situ monitoring of various physical quantities, such as strain, temperature, and pressure.

Compared to local or multi-point fiber optic sensing techniques, in Brillouin-based. strain applied to the fiber. In some optical fibers such as dispersion-shifted fiber, there are actually two peaks in the Brillouin spectrum and it is possible to extract both temperature and strain information from a single fiber.

If one uses the sensor system with our patent pending sensing. stimulated developments of various sensing technologies. Distributed optical fiber sensing technologies have reached market maturity and opened new possibilities in structural health monitoring.

Distributed strain sensor (sensing cable) is sensitive at each point of its length to strain changes and Size: KB. Sensing Strain Using Optical Fiber as a Sensor One family of sensors that is particularly hard to couple to are strain gauges. Here the deformation of a transducer typically causes a change in resistance or generates a voltage.

a split modulated signal injected into both fibers will result in. This chapter provides an introduction to the topic of optical fiber sensing. It starts with defining optical fibers in general, giving guide to how to use them in the field of communications, then moving towards the field of optical fiber sensing.

The concept of sensing using optical fibers is by: 1. A distributed optical strain-sensing technique is presented as a solution for measuring the strain distribution along ground support members used in tunnelling and mining works.

For conventional silica optical fibers, the gauge factor will be a value within the range of – McGraw-Hill Book Company, York, Pennsylvania. Venghuas H Cited by: 5. " Journal of Engineering Mechanics /(ASCE)()() Online publication date: April Yuan Libo Zhou Limin Wu Jingshen "Investigation of a coated optical fiber strain sensor embedded in a linear strain matrix material.

Get this from a library. Strain sensing using optical fibers: final report. [Richard Houghton; Steven Hiles; United States. National Aeronautics and Space Administration.].

An optical fiber strain-sensing technique, on the basis of Brillouin optical time domain reflectometry (BOTDR), was used to monitor the performance of a secant pile wall subjected to multiple props during construction of an adjacent basement in London. •From collaboration with NASA LaRC, shape sensing using fiber strain sensors has been realized •Initial research focuses upon 3-core fiber •This specialty fiber can be replaced with 3 conventional fibers superposition from one another at degrees •From knowing the strain value of each fiber, the 7 February Novel strain-bend sensor using two-mode optical fiber Sergio F.

Almeida, J. Salvador, Sidney L.A. Carrara Author Affiliations +Cited by: 3. and devices being explored for various applications in sensing, and several of them are investigated here. The following is a thesis covering work performed on sensing using specialty optical fibers.

The majority of the following results are focused specifically on coupled multicore fibers and their use in multimode interference : Amy Van Newkirk.

Havermann, D, Mathew, J, Macpherson, WN, Maier, RRJ & Hand, DPIn-situ strain sensing with fiber optic sensors embedded into stainless steel in JP Lynch, KW Wang & H Sohn (eds), Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems vol.

W, Proceedings of SPIE, vol.SPIE Cited by: 2. 3 Distributed Fiber Optic Temperature Sensing Fundamental Physics of DTS Measurements Rayleigh Scattering Raman Spectroscopy Brillouin Scattering Time and Frequency Domain Reflectometry 4 Optical Fibers, Connectors, and Cables Optical Fibers ISBN: X: OCLC Number: Description: xvi, pages: illustrations ; 24 cm: Contents: Ch.

1 Opto-Mechanical Modeling of Fiber Bragg Grating Sensors / Hamid Alemohammad Fiber Bragg Gratings Opto-Mechanical Properties of Optical Fibers Fiber Bragg Gratings With Structurally and Thermally Induced Index Changes Few-mode fibers (FMFs) have found applications in optical communications and sensors with attractive features that standard single mode fiber (SSMF) do not possess.

We report our recent progress on FMF based optical sensors, and show the potential of utilizing the spatial dimension for multi-parameter sensing with discrimination capability.

We first show a discrete type FMF sensor based on. 4. Challenges When Using Distributed Optical Fibers. As happens with any type of monitoring sensing system there are different challenges associated with the application of DOFS systems like the aforementioned limited spatial resolution and monitored length by: High Frequency Distributed Optical Fibre Dynamic Strain Sensing: A Review Introduction The concept of using an optical fibre to map dynamic perturbations along the sensing fibre was first proposed by Taylor et al.

(Taylor ) in and later demonstrated by his team in (Juarez ). Optical fibre sensing is a viable technology to monitor strain, an important physical parameter in many application fields. Basically, fibre optic strain sensing consists of Cited by: Optical fibers are also attractive for applications in sensing, control and instrumentation.

In these areas, optical fibers have made a significant. For these applications fibers are made more susceptible and sensitive to the same external mechanisms against which fibers were made to be immune for their effective operation in Size: KB. The Rayleigh-backscattering-based sensing concept is applied to a standard optical fiber, which is embedded within the full length of the wing main spar.

Individual under-load strain signatures (with a spatial resolution of 1cm) are periodically collected during service for each UAV and compared to. environmental ageing. For a sensing purpose, the coating must also be designed to ensure an optimal transfer of temperature and strain from the host material (concrete matrix, soil, composite laminates) to the optical fiber.

However, due to shear deformation of the cable’s coating, strain measured in the optical. OSP-A Fiber Optic Strain Gauge Miniature, EMI/RFI and lightning immune fiber optic strain gauge Opsens Solutions’ fabrication processes ensure an exact definition of the gauge factor, making OSP-A sensor the most accurate fiber-optic strain gauge sensor in the industry.

Purchase Optofluidics, Sensors and Actuators in Microstructured Optical Fibers - 1st Edition. Print Book & E-Book. ISBNThe optical strain gauge consists of a silica core and cladding that channel the light in the fiber and an outer coating (usually plastic) for protection.

In this article, we will focus on intrinsic fiber optic strain sensors, where the fiber itself is the sensor. Other types of optical fiber sensors use the fiber itself to transmit light, not.

OFS is one of the most innovative companies in the world of fiber optics. Our scientists and engineers imagine and create the products and solutions that often become the standards in the industry, and publish their results in product brochures, technical presentations, presentations and other documents.

Strain gauges 1 and 2 measured strain at one station, strain gauges 3 and 4 at another station and so on. Figure 1. Y-joint test article instrumented with conventional strain gauges and thermocouples before installing strain-sensing fiber.

Optical fibers with Bragg grating strain sensors The single-mode optical fiber used in this experiment Cited by: 4.An optical fiber is a flexible, transparent fiber made by drawing glass or plastic to a diameter slightly thicker than that of a human hair.

Optical fibers are used most often as a means to transmit light between the two ends of the fiber and find wide usage in fiber-optic communications, where they permit transmission over longer distances and at higher bandwidths (data rates) than electrical./ Dynamic strain sensing in a long-span suspension bridge using fiber Bragg grating sensors.

Review of Progress in Quantitative Nondestructive Evaluation. pp. (AIP Conference Proceedings).Cited by: 1.