Hi all ,
I am looking for a distance sensor for joystick application of resolution 0.01mm to 0.05mm.
When joystick is rotated it should tell how much it is deviated.any ideas please suggest.

 

Hi all ,
I am looking for a distance sensor for joystick application of resolution 0.01mm to 0.05mm.
When joystick is rotated it should tell how much it is deviated.any ideas please suggest.

Welcome to AAC.

Could you describe the application? Your specifications don't make a lot of sense on their own. Rotating a joystick 1/100mm or even 5/100mm isn't something I would expect to be repeatable. That's more like touching the stick.

If you could give an explanation of the problem this is intended to solve, you are much more likely to get some useful help.

 

Application: it is used in OCT machine (Medical application)

 

How did you decide that you need a distance sensor? It seems you need a position sensor which might take a number of forms. It would be helpful to get more information about what the mechanism looks like.

 

Sorry about that

kindly wattch the video
In this joystick is used to vary the focal of the lens which captures images of different layers of the eye
Our requirement is when we move that joystick to a small amount sensor should be able to tell that deviation with the given resolution.

 

That's fine, but you asked for a "distance sensor", which means you had some idea of how you would actually use it, that is, how it would be attached to the joystick.

You want to measure rotation, which isn't usually done by what would neb called a "distance sensor".

One more clarification: is the 0.01mm resolution the actual difference in focal length or the amount of motion the operators hand makes—or are you considering that the same thing?

 

the resolution is the amount of motion the operators hand makes

 

No insult intended but getting information from you feels like puling teeth. I can’t help very much because so much of what I need to know I have to guess.

The only recommendation I can offer is to investigate rotary encoders. They can be either directly mounted to the stick concentrically or a gearbox with a positive ratio can be used to increase the amount of rotation the encoder sees.

A rack and pinion arrangement would allow a linear encoder to serve the same purpose.

Note that nether of these are distance sensors. They are position sensors.

Good luck with your project.

 

thank you

 

HI can we use accelerometer and gyroscope ??

 

HI can we use accelerometer and gyroscope ??

No

 

can you suggest any sensor for this ??
1. the base moves forward and lateral movements
2.to track the movement of joystick (how much it is deviated from initial position )

 

View attachment 300108



can you suggest any sensor for this ??
1. the base moves forward and lateral movements
2.to track the movement of joystick (how much it is deviated from initial position )

1. Glass scales
2. Potentiometer or rotary encoder.

 

View attachment 300108



can you suggest any sensor for this ??
1. the base moves forward and lateral movements
2.to track the movement of joystick (how much it is deviated from initial position )

I'm a little familiar with that sort of device. If I'm not mistaken, the joystick is a mechanical device and has no electronics in it.
What you're looking for is a way to install an encoder at the guiding rods. This could be accomplished, as Strantor has already suggested, using either glass (or magnetic) scales, or you could use a linear encoder attached to a rack and pinion mechanism of sorts, for instance.

If you're ingenious enough, it shouldn't be too costly to get what you want.