Stretch Sensor

Help & Support Robot Parts
1

Hey,
I’m currently prototyping for a device I’m trying to make, and it requires relatively precise and accurate readings of stretch.
My question is: is there such a thing on the market right now? I know there are stretch sensors available but some vary in resistance per batch and have either low accuracy, precision or both.

I need a stretch sensor that is reliable, consistent, and one that won’t tear and lose functionality with continued use.

Thanks,
John

2

Another thing to add,
it is possible that a flex sensor can also be used, although it would have to be decently sensitive to lower-gradient curves as well as maintain accuracy, precision, and functionality through use and continued wear.
If there is such a product, I would be interested in that as well.

Thanks,
John

3

Not that we’re aware of. Perhaps use a wire on a retractable cord and a high accuracy encoder? If you can tell us more about your application, perhaps we can provide additional insights.

4

I essentially want stretch sensors that can be incorporated into the fabric of the clothes that can detect motion in the spine (i.e. bending).
They should be sensitive enough so that a 10% stretch in the material becomes measurable and detectable.

Also, although it not need be very precise, durability is something that I am definitely concerned with. I need a stretch sensor that can resist constant wear and use.

Thanks!

5

Our current selection of stretch sensors is not accurate enough for this type of application, nor are the bend sensors. You could try to use several and get an average reading, though you’d first need to calibrate each sensor.
The sensors themselves are rubber-ish and seem quite durable, but if it’s for a commercial product, then you may have to undergo QC and longevity / durability tests.
robotshop.com/en/stretch-bend-sensors.html