Page 1 of 2 12 LastLast
Results 1 to 10 of 12

Thread: Anyone taken a chrono apart or knows about their sensors?

  1. #1
    Insider new ion?'s Avatar
    Join Date
    Feb 2013
    Location
    Victoria, BC
    Posts
    1,296

    Anyone taken a chrono apart or knows about their sensors?

    I'm assuming they're using capacitive sensor systems, but it would be pretty impressive to be able to sense a paintball with a plate small enough to fit in that area, and well fast enough...

    Maybe I'm on the wrong trail?

  2. #2
    Any specific type? I have a handheld XRadar chrono that I could take apart and take a picture of.

  3. #3
    Insider new ion?'s Avatar
    Join Date
    Feb 2013
    Location
    Victoria, BC
    Posts
    1,296
    That would be great actually. I would assume they're similar tech.

    I have a yellow one, unfortunately it's packed away god knows where in my storage unit in another town.

  4. #4
    Here's a few pictures: http://imgur.com/a/eYoM1

    Unfortunately, the component that would be of most interest to you is soldered onto the board and isn't super visible. Hopefully those numbers can help you figure out what part that is.

  5. #5
    Insider
    Join Date
    May 2012
    Posts
    1,182
    Seems to be an hb100 microwave doppler sensor

  6. #6
    CAD Monkey skibbo's Avatar
    Join Date
    Apr 2013
    Location
    Milwaukee County, WI
    Posts
    1,059
    Supports Inception Designs
    I was actually just looking at this for something work related (that I can't talk about)

    the DIY ones I've seen use IR sensors to time a projectile over a distance. not sure how the handheld models work, but I'd bet it's a doppler system that basically does the same thing.
    basically (not meaning to sound patronizing) you just need to time a projectile over a known distance and calculate velocity that way (obviously since V=d/t)
    there are plenty of ways to do that and plenty of sensors to accomplish it. main thing is making sure your clock/timing device is precise enough for your calculations.

    here's a link to a DIY chrono I found
    http://www.instructables.com/id/Pain...raph/?ALLSTEPS
    Team Akkadian Paintball Squad

    B.S. Mechanical Engineering UW-Platteville 2012

    Quote Originally Posted by neftaly
    Simon Stevens said that will be totally fine and nothing bad could ever happen. Ever.

  7. #7
    Insider new ion?'s Avatar
    Join Date
    Feb 2013
    Location
    Victoria, BC
    Posts
    1,296
    Quote Originally Posted by skibbo View Post
    I was actually just looking at this for something work related (that I can't talk about)

    the DIY ones I've seen use IR sensors to time a projectile over a distance. not sure how the handheld models work, but I'd bet it's a doppler system that basically does the same thing.
    basically (not meaning to sound patronizing) you just need to time a projectile over a known distance and calculate velocity that way (obviously since V=d/t)
    there are plenty of ways to do that and plenty of sensors to accomplish it. main thing is making sure your clock/timing device is precise enough for your calculations.

    here's a link to a DIY chrono I found
    http://www.instructables.com/id/Pain...raph/?ALLSTEPS
    I wonder how much this type of system would be affected (I hope that's the right homonym) by the gasses leaving the barrel? I know this was something that we as a collective here have been mentioning every time this comes up.

    Quote Originally Posted by Lurker27 View Post
    Seems to be an hb100 microwave doppler sensor
    Thank you kindly.

  8. #8
    CAD Monkey skibbo's Avatar
    Join Date
    Apr 2013
    Location
    Milwaukee County, WI
    Posts
    1,059
    Supports Inception Designs
    I honestly have no idea. I've never built one to know what the difference is between DIY designs and commercial designs.
    Team Akkadian Paintball Squad

    B.S. Mechanical Engineering UW-Platteville 2012

    Quote Originally Posted by neftaly
    Simon Stevens said that will be totally fine and nothing bad could ever happen. Ever.

  9. #9
    The gases shouldn't affect either the Doppler or IR system. The IR system detects the ball passing by, so it's just a binary sensor and doesn't detect the escaping gases. And unless the speed of light changes drastically because of the expanding gas, the Doppler system shouldn't be affected either. These are just my guesses though.

  10. #10
    Insider new ion?'s Avatar
    Join Date
    Feb 2013
    Location
    Victoria, BC
    Posts
    1,296
    Only reason mentioned the gasses is that often it looks like smoke out of the end of the barrel, which could trip the sensors if the emitter light is attenuated enough through the gasses.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •