Re: Fiberscope Bending Damage Image

Mu wrote:
Hi, What is the appearance in the image of a fiberscope,
borescope or endoscope if there is a bending damage
where the cable is bend tighter than the allowered bending
radius. What are you supposed to see in the image?
Has anyone looked thru one? Thanks.

Mu
I've looked though fiber borescopes though not one which has been
bent beyond it's minimum radius. I can think of two possible failure modes.

One would be that some of the fibers got broken. I'd expect that to show up as dark "pixels" which don't pass light as well as unbroken fibers, if at all. That would appear as semi random dark spots in the image. The fibers in a borescope bundle don't have to be aligned except at the ends, but there's no reason to expect they're completely random either.

The other failure mode is if some of the fibers weren't broken, but were pulled away from the image plane at the eyepiece or objective end. In that case I'd expect to see some areas out of focus relative to other areas of the image. I'd expect out of focus fibers to be in bunches with irregular edges.

If the bundle was bent tightly but not broken or pulled away from the image planes one might see the light from fibers which were most tightly bent dimmed somewhat because of the loss of total internal reflection, but I'd expect them to recover when the bundle was straightened.

I'm assuming you're talking about a fiber bundle borescope, not a cc/video_over_fiber/led borescope.

What are you seeing in your borescope? If the above doesn't explain it link a photo perhaps?
.

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