I need to use this vibration sensor for my project. I'm confused because of the measurement units. Out value of the sensor is in current 0-20mA, which corresponds to 0-25 mm/sec. Why is it being measured in velocity terms?

Please find the link to the datasheet here.

  • \$\begingroup\$ link to datasheet is where? \$\endgroup\$ – brhans Oct 10 '16 at 15:01
  • \$\begingroup\$ Here's why velocity is important. \$\endgroup\$ – JRE Oct 10 '16 at 15:05
  • \$\begingroup\$ Think about it this way: If your machine is sliding across the room at a constant speed, it isn't accelerating but it will soon move far enough to pull its own plug out of the wall. \$\endgroup\$ – JRE Oct 10 '16 at 15:06
  • \$\begingroup\$ That "datasheet" is actually the mounting instructions, and doesn't mention the units. \$\endgroup\$ – JRE Oct 10 '16 at 15:07
  • \$\begingroup\$ I don't see any info on the output in that document. Where did you get the info that it produces 0-20mA for 0-25mm/sec? I've never seen any vibration sensor specified in units of velocity rather than acceleration. \$\endgroup\$ – brhans Oct 10 '16 at 15:23

That's just a voice coil plus rectifier plus low-pass. So it cannot measure acceleration but only velocity.

| improve this answer | |
  • \$\begingroup\$ Even if you're correct about that device using a voice-coil, how would that make it a velocity sensor instead of acceleration? \$\endgroup\$ – brhans Oct 10 '16 at 15:18
  • \$\begingroup\$ Electromagnetic Induction: U=v * L * B0. I don't see a here but v. \$\endgroup\$ – Janka Oct 10 '16 at 15:57

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