Which sensor is suitable for these jobs ??
Hi,
I have the following queries....
1. Can the Ping ultrasonic sensor be used to detect water level in a tank ??
2. Which sensor is suitable for measuring thickness of a sheet of rubber, resolution of 1 to 1.5 mm is acceptable .
thanks
arb
I have the following queries....
1. Can the Ping ultrasonic sensor be used to detect water level in a tank ??
2. Which sensor is suitable for measuring thickness of a sheet of rubber, resolution of 1 to 1.5 mm is acceptable .
thanks
arb
Comments
I would be one of the most happiest persons if parallax actually came up with a water proof PING sensor. And this is no tall order because if non-water resistant sensors can be made, then why not waterproof? Also, I'm sure many people have asked them time and again or even requested them to come up with one.
Post Edited (underworldman) : 7/16/2010 11:09:23 AM GMT
So if the sensor is enclosed inside a metal or a plastic box, will this prevent humidity from affecting the sensor ?.
www.freescale.com/webapp/sps/site/overview.jsp?code=DRSNSPRSSR
Weighing the tank with a load cell is another option, but will probably be more expensive.
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Leon Heller
Amateur radio callsign: G1HSM
Post Edited (Leon) : 7/16/2010 3:07:11 PM GMT
A lot depends on whether you are wanting to measuring the thickness by sensing it from one side of the rubber or if you might be able to have a sensor system that is located on both sides. I have no experience with this, so this is just a guess: but if the rubber is somewhat translucent and fairly homogeneous, perhaps you could shine an LED through it and have something like the TSL230 sensor observe changes in light transmission.
www.parallax.com/tabid/768/txtSearch/TSL230/List/0/SortField/4/Default.aspx
If you can measure the rubber only from a single side, perhaps you can still use the TSL230 by having an LED shine into the rubber, perhaps aiming at a reflector on the opposite side, and then have the TSL230 measure the light scattering backwards, but this is probably not as good as a system that shines light straight through the material.
For the thickness you're talking about, I'm guessing a red LED or IR emitter LED would have the best chance of success since the longer wavelengths of light tend to penetrate deeper through materials.
But again, this is for a rubber that is at least somewhat translucent.
Just a thought.
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Leon Heller
Amateur radio callsign: G1HSM
http://www.labtek.net/peacock-11.htm
-Phil
I think the new PING is on hold.
http://forums.parallax.com/forums/default.aspx?f=5&m=354639
Can't find it on the Parallax website.
Jim
Parallax DID have a water resistant product in line, but they have had some problems.
http://forums.parallax.com/forums/default.aspx?f=5&m=354639
Jim
arb,
keep in mind that if your rubber is moving along on top of or between some kind of roller system, the rubber will be under tension and the tension forces need to be held constant so you aren't randomly stretching the rubber and getting random results.
Oops. I just noticed that your resolution is 1 to 1.5 mm. My first responses were based on thinking that was your range. How thick is this rubber on average?
the rubber is not translucent..
the thickness of the rubber sheet is around 8-10 mm but this can be more in some cases,
The pressure sensor looks good, but I think it may be expensive for a home project.
The laser idea looks ideal I have seen these being used in tyre industries.
- Ed
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