Fiber Optics Sensing System: A New Technology for Measurement



[ Music ] >> The single word I would use to characterize FOSS
is revolutionary. If it can be used and utilized
and implemented effectively, I believe it can really
revolutionize the way we do our business in aerospace. >>Gamechanger. Fiber optics is
a gamechanger because we can lay a line of
fiber in any orientation on that structure and we
can get a continuous measurement of strain. >> It's a gamechanger because
it gives designers real time information which they never had
before. [clacking] >> These are all individual
fiber optic sensors on the wing, and then these are the
individual strain values. >> We have deeper insight
into how a structure performs, not only in operation but all
the way through its life cycle from the development
of the structure; as you get it ground
tested, as you transition into a flight environment,
as you get to the end of a life cycle when
you're trying to determine how much
life is really remaining in the structure? FOSS can save time on your
schedule for installing sensors, it can give you greater insight
and much more spacial fidelity in your measurement
system than ever before. >> We have given the designers
a new tool within their toolbox to use to validate their models. >> The state of the
art technology in fiber optic sensing is
something we've been advancing in order to be able to
allow a wing in flight to maintain the optimal
configuration and the first step towards wing
shape control is knowing what the position or the displacement
or deformations of that wing is as they traverse through the
air and they're subjected to wind gusts and atmospheric
turbulence and things like that. The genesis of FOSS came
about as a result of working with conventional technology. What I mean by that is
strain gauge technology in particular, and
thermal couples. Strain gauges measure strain and thermal couples
measure temperature. >> This is the conventional way of doing health monitoring
for structures. Each one of these connectors
is the termination for each one of these gold packages that you
see mounted on this panel. And each of these gold packages, these conventional
strain gauges, have with them the
associated wires that have to be soldered on,
has to be prepared, they have to be terminated using
various types of connectors. There's a lot of work involved in installing these
conventional strain gauges and with the strain gauges, they are only making
point measurements. So wherever you see a gold
package, we are making that strain measurement
at that one location. >> Imagine having your
arm have one measurement and you wouldn't be able to
feel anything else around it, it's kind of limiting. Same thing structurally, you
don't have a lot of insight into what's going
on in the structure if you have a sensor
every several feet. The FOSS technology allows you to have a sensor every quarter
inch along the single optical fiber; that allows you
to look more and more like a biological system. >>Very light weight, much easier
to install, less complexity, 21 strain measurements, 1400, one thousand four hundred strain
measurements on a single fiber. For practical purposes, you
can put as many of these fibers on your vehicle as you want to
or on your structure as you want without sacrificing the
weight requirements. >> Instead of using current
and voltage and resistance of that electrical
resistant strain gauge, now we're shining a light
down this optical fiber. >> And as that light
propagates down the fiber, it comes in contact with
what we call Bragg gratings. And these Bragg gratings are
like translucent mirrors that reflect at very unique
wavelengths. These unique wavelengths that are reflected are
actually sampled and measured. >> Those changes in wavelength
are what we calibrate to engineering parameters. >> One of the powerful
aspects of FOSS is that it's not only the
number of measurands that you can monitor, a
measurand being strain or temperature, basic engineering
parameters that we use quantify a
structure's performance. It could also measure liquid
level, magnetic field, three dimensional shape. >> As I apply pressure
on this test article, we can see how the
shape is changing, as well as the intensity of the strain being felt
by the test article. What we have here
is the demonstration of the liquid level
sensing technology. What we're able to do is
use the fiber optic sensors to monitor the different
absorption rates of the liquid and the air to determine
where is the boundary between liquid and air. Here we have a demonstration of our hybrid fiber
optic system. With this, we're able to get our
quarter inch spatial resolution, at up to 100 samples a
second and at strategic places, we can place a strong
grating that we call it, allows us to acquire
strain measurements at up to 5 kilohertz. >> I think commercial
applications are really endless and the more that we explore
interest in different realms, we understand that there's
really a role for FOSS in ways that we never imagined
to begin with. >> In 20 years, the hope
is that we would see this on commercial aircraft;
we would see it on expendable launch vehicles, as health management systems
for ELVs. Another big area is oil and gas;
monitoring the drill head on a down-hole rig, being
able to look at what the status is
on the holding tanks. >> Liquid level inside of
tank, in cryogenic propellants or in any kind of
fluid through pipes. >> The list just goes on and on. [ Music ] >> I think what excites me most about FOSS is seeing the
light go on in people's eyes, the lightbulb actually shows up
above people's heads when you start to
describe, for the first time, the capability of
the technology. This could really change
the way they do business. This could save a lot of time on their schedule because now
they only have one system that can perform all
these measurements. So for me, seeing that epiphany,
seeing that actually develop and seeing the application
potential, I think, has really been rewarding. You know, it does go almost
anywhere into various places where you're monitoring
structure, structural response so to see that happen is pretty
rewarding and exciting.

8 Comments

  1. Faisal Soudagar said:

    I have u are searching all over invention

    June 30, 2019
    Reply
  2. Roksanda Kosmajac said:

    NIKOLA TESLA technology…confiscated at his death…his 36 boxes behind our Modern tech.

    June 30, 2019
    Reply
  3. AnteConfig said:

    Wow. this is great. I could use this to measure the spatial position of my robotic arm or control my computer with my arm or fingers!
    I can't wait to figure out how to make it myself.

    June 30, 2019
    Reply
  4. Mic Chaudoir said:

    Fiberguide Industries and Micron Optics have been utilizing this technology for years now – the magic is in the mounting and assemblies, as they say in the video. The actual device itself is simpler than one might think…..

    June 30, 2019
    Reply
  5. Edward Vojcak said:

    Only indirectly monitors high cycle fatigue

    June 30, 2019
    Reply
  6. Jorge Gamaliel Frade Chávez said:

    Very very interesting!! in fact i think that this technology can be used with wearables for motion capture and teleoperation more or less like this video: http://ow.ly/33gt3033Agv

    June 30, 2019
    Reply
  7. Jorge Gamaliel Frade Chávez said:

    If you want to find the secrets of the universe, think in terms of energy, frequency and vibration. Nikola Tesla.

    June 30, 2019
    Reply
  8. Skylar Laham said:

    Thank you for sharing. Allen Parkers's demonstration of previous fiber-optic technologies as compared to FOSS technology used at NASA Armstrong is very insightful and interesting!

    June 30, 2019
    Reply

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