I am looking for a sensor that can detect objects as small as 4mm moving through a two inch pipe. I want to do this as cheap as possible. I was looking at the Ultrasonic Rangefinders but don't know how they would work in a pipe. Would the Sharp GP2Y0D810Z0F work?
Thank you
Tyler
Sensors
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- zener
- Posts: 4567
- Joined: Sat Feb 21, 2009 2:38 am
Re: Sensors
Maybe these:
https://www.adafruit.com/product/2167
She Sharp part might work.
You might need more than one, depending on what all might come by. It might take some experimentation.
https://www.adafruit.com/product/2167
She Sharp part might work.
You might need more than one, depending on what all might come by. It might take some experimentation.
- adafruit_support_bill
- Posts: 88151
- Joined: Sat Feb 07, 2009 10:11 am
Re: Sensors
A 4mm object passing through a ~50mm diameter pipe could be a challenge. How fast are the objects moving? Do they move along the inner surface of the pipe, or can they be anywhere in that 50mm diameter space?
- TJA
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- Joined: Wed Aug 19, 2015 8:25 pm
Re: Sensors
The objects could be any where in the pipe and move slowly. I have decided to reduce the pipe to one inch. What if made the inside of the pipe where the sensor is going more reflective?
Thank you
Tyler
Thank you
Tyler
- adafruit_support_bill
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- Joined: Sat Feb 07, 2009 10:11 am
Re: Sensors
I don't think ultrasonic will work well in those conditions.
You can try a 'beam-break' type of sensor array. You will need some careful design to assure full coverage of the cross section of pipe.
Depending on the reflectivity of the objects, you might be able to use an array of IR or visible light proximity sensors.
An imaging type sensor is another option. But you may have difficulty getting enough depth of field in close quarters.
You can try a 'beam-break' type of sensor array. You will need some careful design to assure full coverage of the cross section of pipe.
Depending on the reflectivity of the objects, you might be able to use an array of IR or visible light proximity sensors.
An imaging type sensor is another option. But you may have difficulty getting enough depth of field in close quarters.
- TJA
- Posts: 3
- Joined: Wed Aug 19, 2015 8:25 pm
Re: Sensors
I think if I put the sensor in a pipe tee i could improve the coverage of the IR sensor.
Thank everyone for the help
Tyler
Thank everyone for the help
Tyler
- adafruit_support_bill
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Re: Sensors
Something like a pipe Tee would definitely give you more flexibility and improve the field of view of any of the reflective type sensors.
- zener
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- Joined: Sat Feb 21, 2009 2:38 am
Re: Sensors
I have seen this done for detecting a flying projectile. The detectors all went into an array of OR gates, then to the Arduino. Worked well.adafruit_support_bill wrote:You can try a 'beam-break' type of sensor array. You will need some careful design to assure full coverage of the cross section of pipe.
- adafruit_support_bill
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- Joined: Sat Feb 07, 2009 10:11 am
Re: Sensors
I've also done similar things with a collimated beam and a linear CCD array. Requires a bit of room for the optics though.I have seen this done for detecting a flying projectile.
Please be positive and constructive with your questions and comments.