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### Topic: Measuring a very fine wire with 10 µm precision (Read 20180 times)previous topic - next topic

#### jean507

##### Jan 21, 2013, 01:32 am
Hi,

My goal is to measure a very fine wire with 10 µm (or better) precision using the arduino. I've been looking around for a way to do this and I could not find anything other than laser micrometer. (i.e. http://www.micro-epsilon.com/optical-micrometer/micrometer/optoCONTROL_1200/index.html)

Is anyone familiar with a strategy/way to achieve this in a DIY fashion using the arduino. What kind of sensors would you need?

Thank you

Boots

#### johnwasser

#1
##### Jan 21, 2013, 01:41 am
It might help if you give an actual dimension for  "very fine wire".

I'm guessing you are measuring the width of the wire.  Is that true?

How frequently do you need to make the measurement?
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#### dhenry

#2
##### Jan 21, 2013, 01:50 am
one approach would be to use the wire to set the gap between two metal plates and measure the capacitance between them.

#### PeterH

#3
##### Jan 21, 2013, 01:57 am

My goal is to measure a very fine wire with 10 µm (or better) precision using the arduino.

Have you considered using a microscope?

#### gardner

#4
##### Jan 21, 2013, 02:24 am
Perhaps measure the resistance of a known length of wire, and correlate to cross-sectional area and thereby diameter.

#### jean507

#5
##### Jan 21, 2013, 04:30 am

It might help if you give an actual dimension for  "very fine wire".

I'm guessing you are measuring the width of the wire.  Is that true?

How frequently do you need to make the measurement?

I am talking about a wire of AWG44 around 0.0585 mm in diameter.

Yes, I am measuring the width/diameter of the wire and I would like to make the measurement several time per seconds using the Arduino.

#### jean507

#6
##### Jan 21, 2013, 04:32 am

My goal is to measure a very fine wire with 10 µm (or better) precision using the arduino.

Have you considered using a microscope?

Yes, but I need to take the measurement automatically and several times per seconds.

#### jean507

#7
##### Jan 21, 2013, 04:34 amLast Edit: Jan 21, 2013, 04:36 am by Boots507 Reason: 1

one approach would be to use the wire to set the gap between two metal plates and measure the capacitance between them.

I am not familiar with this approach. Would you have some examples or perhaps reading on that technique of wire diameter measurement.

#### rvasque

#8
##### Jan 21, 2013, 04:38 am
Are you serious?
You need to be able to distinguish .001mm precision?

What are you doing?

#### jean507

#9
##### Jan 21, 2013, 04:46 am

Are you serious?
You need to be able to distinguish .001mm precision?

What are you doing?

Hi,

10 micrometers = 0.01 millimeters
AWG44 is finest wire gage I would like to be able to measure. I'm trying to read the diameter of the said wire as it unwinds from its spool.

#### rvasque

#10
##### Jan 21, 2013, 04:59 am
I'm thinking 1micron... but still, 0.01mm resolution?

And what's your contraption/Arduino supposed to do when you detect a delta change of 0.01mm in the wire diameter?

#### jean507

#11
##### Jan 21, 2013, 05:02 am
I am interested in tightly spooling the wire on a coil former. The coil will then be used for another project and it has to be well packed. Instead of working form the theorical diameter of the wire when making the coil, I am interested in measuring it as it unwinds from it's original spool (more accurate).

#### zoomkat

#12
##### Jan 21, 2013, 05:26 am
Quote
Is anyone familiar with a strategy/way to achieve this in a DIY fashion using the arduino. What kind of sensors would you need?

The arduino and its limitations are fairly well understood. The sensor you seek will be the challange. kind of like wanting to use an arduino to turn an empty pizza box into a flat screen tv.
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#### JimboZA

#13
##### Jan 21, 2013, 05:30 am
Quote
measure a very fine wire with 10 µm (or better) precision

But how accurate do you want it?
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#### jean507

#14
##### Jan 21, 2013, 05:32 am

Quote
measure a very fine wire with 10 µm (or better) precision

But how accurate do you want it?

I would be really happy if I could record the wire diameter within 0.001mm. I'm not sure if that is possible.

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