Displacement Sensor

[Dave]

I am looking for a non contact displacement measuring device.
Basically I need to measure the distance from my sensor to a surface
over a range of approx 100 - 400 mm, hopefully with an accuracy of
better than +/- 1mm

I have found a Displacement Sensor made by Sick (yes, really !), the
OD 250-150P142, which would appear to do the job. It is an optical
unit & costs about AU$1100. It provides an analogue output which I can
convert to RS232.

Has anyone here had any experience using this device ?

Are there any other devices (hopefully cheaper !) that I should
consider ?

Thanks in anticipation.

Dave

 

[Mike Harding]

On Wed, 03 Dec 2003 09:32:22 +0800, Dave <dave50_8@hotmail.com> wrote:

I am looking for a non contact displacement measuring device.
Basically I need to measure the distance from my sensor to a surface
over a range of approx 100 - 400 mm, hopefully with an accuracy of
better than +/- 1mm

I have found a Displacement Sensor made by Sick (yes, really !), the
OD 250-150P142, which would appear to do the job. It is an optical
unit & costs about AU$1100. It provides an analogue output which I can
convert to RS232.

Has anyone here had any experience using this device ?

Are there any other devices (hopefully cheaper !) that I should
consider ?

Ultrasonics? A few quick sums suggest you would need
to be able to time to around 3uS to obtain 1mm resolution
over a 200mm round trip, which should be quite do-able.

Mike Harding

 

[Dave]

Mike

Thanks for the reply.

I did consider ultrasonics but I need a fairly small target spot ie I
want to find the edge of an object in the target area as well as
measure it's profile by moving the sensor around - I don't think this
would be possible using ultrasonics but maybe you have better
knowledge of the field.

I am also hoping to use a ready built module.

Dave

On Wed, 03 Dec 2003 12:58:00 +1100, Mike Harding
<mike_harding1@nixspamhotmail.com> wrote:

On Wed, 03 Dec 2003 09:32:22 +0800, Dave <dave50_8@hotmail.com> wrote:

I am looking for a non contact displacement measuring device.
Basically I need to measure the distance from my sensor to a surface
over a range of approx 100 - 400 mm, hopefully with an accuracy of
better than +/- 1mm

I have found a Displacement Sensor made by Sick (yes, really !), the
OD 250-150P142, which would appear to do the job. It is an optical
unit & costs about AU$1100. It provides an analogue output which I can
convert to RS232.

Has anyone here had any experience using this device ?

Are there any other devices (hopefully cheaper !) that I should
consider ?

Ultrasonics? A few quick sums suggest you would need
to be able to time to around 3uS to obtain 1mm resolution
over a 200mm round trip, which should be quite do-able.

Mike Harding

 

[Mike Harding]

On Wed, 03 Dec 2003 16:16:49 +0800, Dave <dave50_8@hotmail.com> wrote:

I did consider ultrasonics but I need a fairly small target spot ie I
want to find the edge of an object in the target area as well as
measure it's profile by moving the sensor around - I don't think this
would be possible using ultrasonics but maybe you have better
knowledge of the field.

You could do it with U/S but it might make the signal
processing much more complicated, depends exactly
what you're trying to do. Sounds like a commercial
project? You really need to hire me as a consultant

I am also hoping to use a ready built module.

Given the cost of developing something for this
application, $1100 would sound like money well spent
if you're only making a small number of these units?

Will the [sic] Sick unit achieve the accuracy and
resolution you require though? I found the data sheet
rather difficult to understand.

www.sick.de/de/products/categories/industrial/distancesensors/
od/en.toolboxpar.0002.file.tmp/OD_DB_e.pdf

Mike Harding

 

[Dave]

You are right, it is a commercial project. I would love to describe it
and bounce a few ideas around, but the client wants it kept under
wraps :-(. Initially its a one off, but hopefully there will be a few
more down the line.

Like you, I had some difficulty understanding the Sick datasheet but
their local agent reckons it should do the job.

The price is not out of reach, but I wanted to check that I was not
missing something that would be a cheaper solution.


Dave

On Thu, 04 Dec 2003 08:14:04 +1100, Mike Harding
<mike_harding1@nixspamhotmail.com> wrote:

On Wed, 03 Dec 2003 16:16:49 +0800, Dave <dave50_8@hotmail.com> wrote:

I did consider ultrasonics but I need a fairly small target spot ie I
want to find the edge of an object in the target area as well as
measure it's profile by moving the sensor around - I don't think this
would be possible using ultrasonics but maybe you have better
knowledge of the field.

You could do it with U/S but it might make the signal
processing much more complicated, depends exactly
what you're trying to do. Sounds like a commercial
project? You really need to hire me as a consultant

I am also hoping to use a ready built module.

Given the cost of developing something for this
application, $1100 would sound like money well spent
if you're only making a small number of these units?

Will the [sic] Sick unit achieve the accuracy and
resolution you require though? I found the data sheet
rather difficult to understand.

www.sick.de/de/products/categories/industrial/distancesensors/
od/en.toolboxpar.0002.file.tmp/OD_DB_e.pdf

Mike Harding

 

[Paul Bealing]

Dave wrote:

I am looking for a non contact displacement measuring device.
Basically I need to measure the distance from my sensor to a surface
over a range of approx 100 - 400 mm, hopefully with an accuracy of
better than +/- 1mm

I have found a Displacement Sensor made by Sick (yes, really !), the
OD 250-150P142, which would appear to do the job. It is an optical
unit & costs about AU$1100. It provides an analogue output which I can
convert to RS232.

Has anyone here had any experience using this device ?

Are there any other devices (hopefully cheaper !) that I should
consider ?

Thanks in anticipation.

Dave

Have a look (Google search) for the Sharp GP2D02 Ranger.
It's an IR optical distance measuring device; available in a couple of
output formats.

I have heard from someone looking at using them that you can get them
for under $25 each in Australia. I don't know where from but the agent
shouldn't be too hard to track down.

Regards
Paul Bealing
www.pmb.co.nz

 

[Dave]

Thanks for that Paul, it certainly looks worth following up. Just got
to find the Aus agent.

Dave

On Thu, 04 Dec 2003 16:37:28 +1300, Paul Bealing <paul@pmb.co.nz>
wrote:

Dave wrote:
I am looking for a non contact displacement measuring device.
Basically I need to measure the distance from my sensor to a surface
over a range of approx 100 - 400 mm, hopefully with an accuracy of
better than +/- 1mm

I have found a Displacement Sensor made by Sick (yes, really !), the
OD 250-150P142, which would appear to do the job. It is an optical
unit & costs about AU$1100. It provides an analogue output which I can
convert to RS232.

Has anyone here had any experience using this device ?

Are there any other devices (hopefully cheaper !) that I should
consider ?

Thanks in anticipation.

Dave

Have a look (Google search) for the Sharp GP2D02 Ranger.
It's an IR optical distance measuring device; available in a couple of
output formats.

I have heard from someone looking at using them that you can get them
for under $25 each in Australia. I don't know where from but the agent
shouldn't be too hard to track down.

Regards
Paul Bealing
www.pmb.co.nz

 

[Rob]

"Dave" <dave50_8@hotmail.com> wrote in message
news:7uitsvs4vtsh8ij2j7njqufdgrtehbud08@4ax.com...

Thanks for that Paul, it certainly looks worth following up. Just got
to find the Aus agent.

Dave

The agent is a company on the east coast (the other side to where I am)
called Manuco.

http://www.manuco.com.au/

They have other nice gadgets from Sharp like dust sensors etc.

Rob

 

[onestone]

Both sharp and Seiko make distance measuring devices. The Sharp devices
are much easier to find. The GP2Y0D02YK measures up to 150cm. Sorry I
only have an old preliminary data sheet.

Al

Dave wrote:

I am looking for a non contact displacement measuring device.
Basically I need to measure the distance from my sensor to a surface
over a range of approx 100 - 400 mm, hopefully with an accuracy of
better than +/- 1mm

I have found a Displacement Sensor made by Sick (yes, really !), the
OD 250-150P142, which would appear to do the job. It is an optical
unit & costs about AU$1100. It provides an analogue output which I can
convert to RS232.

Has anyone here had any experience using this device ?

Are there any other devices (hopefully cheaper !) that I should
consider ?

Thanks in anticipation.

Dave

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