How can I select the right Accelerometer?

I am designing a sensor to measure vibration from industrial equipment.

The main required characteristics of the accelerometer are listed below:

- Acceleration Range - up to 8g

- Type - Digital

- Output Type - I²C, SPI

- Axis - X / Y / Z

- Bandwidth - minimum of 1.6KHz (as higher the better)

- Resolution - 16 bits

 

I found a lot of accelerometer that meet the specifications above, although I am not being able to understand how can I guarantee a good resolution in high frequencies of the accelerometer.

I already tested the MPU9250 in a shaker and the results in low frequency (until 150Hz) is reasonable, although in high frequencies (from 150Hz until 1kHz) it is horrible as shown below:

ps- the blue dots are the reference accelerometer (piezoeletric) and the orange dot is the MPU9250.

 

My question is:

  • How can I understand from the datasheet that the resolution in high frequency will be ok?
  • 0
    •  Analog Employees 
    on Dec 7, 2019 11:29 PM

    Thanks for the question. I'll suggest starting with the ultra-low noise ADXL35x family we recently released. You can also try ADI's higher bandwidth ADXL100x family for condition-based monitoring application, though it only provides analog output.