High Frequency that can cause g-sensor damage

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Discussion Overview

The discussion centers around measuring the frequency of a PCB depaneling machine to assess potential damage to a gyro-sensor. Participants explore methods for converting amplitude readings into acceleration or velocity to quantify the measurements in gravitational units (g). The conversation includes technical details about measurement techniques and data analysis methods.

Discussion Character

  • Technical explanation
  • Mathematical reasoning
  • Debate/contested

Main Points Raised

  • One participant describes using a Laser Doppler vibrometer connected to an oscilloscope to measure frequency and amplitude, seeking guidance on converting amplitude to acceleration or velocity.
  • Another participant suggests performing a Fourier transform on the time series data to obtain a spectrum with normalized units for amplitude.
  • A different participant proposes assuming a sinusoidal model for the data, providing a mathematical approach to derive acceleration from amplitude and frequency.
  • One participant emphasizes the need to interpret amplitude as a measure of distance rather than voltage to determine acceleration accurately.

Areas of Agreement / Disagreement

Participants express differing views on the best approach to convert amplitude into acceleration, with no consensus on a single method. Some methods are proposed, but the discussion remains unresolved regarding the most effective technique.

Contextual Notes

Participants mention the need for original acceleration vs. time data in known units, indicating potential limitations in the data available for analysis. There are also unresolved questions about the normalization of amplitude units in the context of Fourier analysis.

Who May Find This Useful

This discussion may be of interest to engineers and researchers involved in sensor technology, signal processing, and vibration analysis, particularly those working with PCB manufacturing and gyro-sensor applications.

Master_Viper
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Hello All,

Anyone can help, but first allow me to give you some background, I have a project this project is to measure the frequency of the PCB depaneling machine that might damage the sensetive component which is the gyro-sensor. The sensor will damage if the frequency is above 75kHz or 100 g (gravitational force). So, Inorder to measure this I have to use a Laser doppler vibrometer, however, the equipment that I used is not capable to measure the entire length of the PCB, what I did is connect the equipment to oscilloscope so that I can measure the entire length of the PCB. Now, I have the reading of frequency and amplitude. My question is how to convert the amplitude into acceleration/velocity to get the unit measurement of g.

Thanks in advance!
 
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Somewhere there is likely a Fourier transform of time series data. One can perform a Fourier transform carefully and yield a spectrum that has expected units that are properly normalized in terms of amplitude (g's or m/s/s vs. frequency). Do you have the original acceleration vs. time data in known units?
 
Can you assume a sample corresponds to a sin wave: position = amplitude x sin(time x frequency x 2 x pi)? If so, then you could use the second derivative = - amplitude x (frequency x 2 x pi)^2 x sin(time x frequency x 2 x pi). Peak acceleration would occur when sin() == 1.
 
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Dr. Courtney said:
Somewhere there is likely a Fourier transform of time series data. One can perform a Fourier transform carefully and yield a spectrum that has expected units that are properly normalized in terms of amplitude (g's or m/s/s vs. frequency). Do you have the original acceleration vs. time data in known units?
Dr. Courtney said:
Somewhere there is likely a Fourier transform of time series data. One can perform a Fourier transform carefully and yield a spectrum that has expected units that are properly normalized in terms of amplitude (g's or m/s/s vs. frequency). Do you have the original acceleration vs. time data in known units?


I have a reading of the following:
Frequency : 171.4 Khz
Peak-Peak : 3.28 V
Amplitude : 120mV
RMS : 479mV

Base on the above data I tried to transform to Fourier Spectrum Analyzer, However, the problem is the unit measurement of amplitude.
 
To determine acceleration (g-force), you need amplitude ((peak to peak) / 2) as a measure of distance (not voltage).
 

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