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Springloaded linear potentiometer

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Sudo_apt-get_install_yum:
Im working on a project where i need to measure a small amount of linear movement (a few millimeters).
I had a few laying around but cant find a supplier for them does anybody know of any company who produces or supplies these types of potentiometers?

I would like to hear if anybody has a better solution for measuring very small movements in one axis

The below image is of the linear potentiometer.

AndyC_772:
What level of accuracy do you need? How fast is your target moving?

Sudo_apt-get_install_yum:
The speed is variable but it’s never more than a few millimeters per second. The accuracy should be somewhere between 1/10mm - 1/100mm.

mariush:
Maybe the same idea behind precision rulers/calipers...
Maybe you can repurpose a mouse sensor
Maybe you can do some infrared led and detector annd measure change in light as object moves
permanent magnets on partt, hall effect sensors on botom?

mikerj:
https://www.variohm.com/images/datasheets/KTP_Position_Sensor_%201807_E.pdf
https://www.megatron.de/en/category/potentiometric-position-sensors.html

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