Piezoelectric sensors or Mesh to measure Camber?
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Thanks for all the input on the last post. That has led me to finding
just the right sensor for my project, measuring stress or deflection
of a straight stick or beam. The difficulty is that I malooking for
change along the whole length of the beam and then I want to use the
values from the sensors to create an image on the pc. Basically all
0's = a straight beam and -2, 0, 2, 0, -2 would mean a wavy beam.
I believe the best way to tackle this is using Piezoelectric sensors
placed at intervals and polled by the BS2 for their value, or look
for some sort of mesh or screen sensor that would indicate flex.
Has anybody worked with this type of product before, thoughts, or
sources or info ?
Thanks
Rob
just the right sensor for my project, measuring stress or deflection
of a straight stick or beam. The difficulty is that I malooking for
change along the whole length of the beam and then I want to use the
values from the sensors to create an image on the pc. Basically all
0's = a straight beam and -2, 0, 2, 0, -2 would mean a wavy beam.
I believe the best way to tackle this is using Piezoelectric sensors
placed at intervals and polled by the BS2 for their value, or look
for some sort of mesh or screen sensor that would indicate flex.
Has anybody worked with this type of product before, thoughts, or
sources or info ?
Thanks
Rob
Comments
You could mount a servo above the beam and then scan the length of the
beam with sonar (or IR?) and take readings at intervals of the scan. Run
the scan before the test begins to establish a "neutral" for a
non-stressed test beam and then scan during and after to get a picture of
deflection.
This would be dependent on the environment (how much light, is the test
substance reflective to sound/light etc.) but it would allow you to vary
the sample interval to gather as much or as little data as needed. If the
angle of the scanning is an issue you might be able to use the mech out
of an ink jet printer or some other slide mech to kep the sensor 90
degrees to the surface of the sample.
In fact, now that I think about it, you could use a slide mech of that
type with a "bend" sensor (
http://www.parallax.com/detail.asp?product_id=30056 ) that would ride the
length of the test beam recording rises and dips in the surface. This
would allow you to, again depending on the sample rate, record with
variable accuracy the amount of flex in the beam. Just musing..
Ok, enough musing.. it's time to go home! [noparse];)[/noparse]
Vern
--
Vern Graner CNE/CNA/SSE | "If the network is down, then you're
Senior Systems Engineer | obviously incompetent so why are we
Texas Information Services | paying you? Of course, if the network
vern@t... www.txis.com | is up, then we obviously don't need
Cell 507-7851 Desk 328-8947 | you, so why are we paying you?" VLG
rltaylor001 said:
> Thanks for all the input on the last post. That has led me to finding
> just the right sensor for my project, measuring stress or deflection
> of a straight stick or beam. The difficulty is that I malooking for
> change along the whole length of the beam and then I want to use the
> values from the sensors to create an image on the pc. Basically all
> 0's = a straight beam and -2, 0, 2, 0, -2 would mean a wavy beam.
>
> I believe the best way to tackle this is using Piezoelectric sensors
> placed at intervals and polled by the BS2 for their value, or look
> for some sort of mesh or screen sensor that would indicate flex.
>
> Has anybody worked with this type of product before, thoughts, or
> sources or info ?
>
> Thanks
> Rob
>
>
>
>
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