Vibration Sensor: What Does "g" Mean?

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Discussion Overview

The discussion revolves around the meaning of "g" in the context of vibration sensors, specifically accelerometers. Participants seek clarification on how "g" relates to acceleration measurements and the implications of sensor specifications.

Discussion Character

  • Technical explanation
  • Conceptual clarification
  • Homework-related

Main Points Raised

  • One participant notes that "g" refers to the standard acceleration due to gravity, approximately 9.80665 m/s², and that the sensor outputs acceleration rather than position or displacement.
  • Another participant mentions having a 100g unit with a sensitivity of 20 mV per g, expressing confusion about these specifications and seeking simpler explanations.
  • A further contribution explains that the sensitivity indicates how many milli-Volts the accelerometer outputs per g measured, suggesting that higher sensitivity is beneficial for measuring higher accelerations.
  • There is a suggestion that if one only needs to measure up to 20g, a sensor with higher mV/g sensitivity would provide better resolution for accurate readings.
  • One participant provides a link to additional resources for further exploration of accelerometer sensitivity.

Areas of Agreement / Disagreement

Participants express varying levels of understanding regarding the specifications of vibration sensors and their implications, indicating that multiple viewpoints exist without a clear consensus on the best way to explain the concepts involved.

Contextual Notes

Some participants may have differing interpretations of the implications of sensitivity and the practical applications of the sensors, which are not fully resolved in the discussion.

Who May Find This Useful

This discussion may be useful for individuals new to vibration sensors or accelerometers, particularly those seeking to understand the significance of "g" and sensor specifications.

rama1001
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I am reading a vibration sensor manuvall that always written in units of "g". what is the meaning of that g. Can some explain me. The document is down here.
 
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Attached down here.
 

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It's an accelerometer, not a DIRECT vibration sensor, so it's not outputting position or displacement but acceleration.

It's in terms of "g", meaning the standard acceleration of free fall (gravity) here on earth. Simply put it's displaying acceleration where 1 unit is equal to 9.80665 m/s*s.
 
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The sensor i have is a 100g unit and its sensitivity is 20mV per g. More,if i have a 2g unit which can give more higher output. These words are written to me by a sensor vendor. I don't understand these as well. I am new to these vibration sensor. can some explain me in simple way.
 
That just tells you how many milli-Volts the accelerometer will output per g measured. The 20 mV/g sensitivity would be better for higher accelerations. If you only wanted to measure up to 20g rather than 100g, then you'd want more mV/g so that you would have better resolution (read the vibration more accurately).

There are many search options available, which bring up far better resources than I can provide by typing here.
http://www.lmgtfy.com/?q=accelerometer+sensitivity
 

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