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problem with acceleration amplitude in IIS2DH

ESmir.1
Associate

Hello

We tested the IIS2DH sensor on a shaker.

Accelerometer Settings:

  • ODR = 5376
  • Full-scale = +/- 16g
  • Low-power mode.
  • High-pass filter bypassed

Shaker Settings:

  • frequency 1 kHz
  • acceleration amplitude 13.592 g

As a result, the accelerometer registered an acceleration amplitude of 2 g less than the real one.

What could be the problem? we wanted to repeat the result of the experiment presented at https://www.st.com/content/ccc/resource/technical/document/white_paper/group0/c0/30/46/2f/00/24/42/1c/Capacitive_MEMS_accelerometer_for_condition_monitoring/files/MEMS_Condition_monitoring.pdf/jcr:content/translations/en.MEMS_Condition_monitoring.pdf

experimental data example:

raw acceleration(g)

-14336 -10.18997505

-10752 -7.384129908

7424 6.845513329

12800 11.05428105

1536 2.23591059

-12544 -8.787052481

-15360 -10.9916451

1792 2.436328101

11008 9.651358475

9216 8.248435902

-9216 -6.181624846

-15360 -10.9916451

-6656 -4.177449742

9216 8.248435902

12544 10.85386354

-3072 -1.371604597

-13568 -9.588722522

-13568 -9.588722522

5120 5.041755736

12032 10.45302852

5376 5.242173246

-11264 -7.784964929

-15872 -11.39248012

-2048 -0.569934555

10240 9.050105943

11520 10.0521935

-6656 -4.177449742

-14592 -10.39039256

-10240 -6.983294887

7680 7.04593084

12800 11.05428105

768 1.634658059

-12800 -8.987469991

-15360 -10.9916451

2304 2.837163121

11008 9.651358475

8704 7.847600881

-9728 -6.582459867

-15616 -11.19206261

2 REPLIES 2
Eleon BORLINI
ST Employee

Hi @ESmir.1​ , I'm wondering if there could be some kind of (unwanted) mechanical low pass filter on the setup... Did you tested 100Hz and 500Hz frequencies too (as in the white paper you reported)? Do you process data in terms of rms /peak value, FFT, or else? Regards

ESmir.1
Associate

Thanks for the answer, the problems were in our shaker. It has a problem with resonance just at this frequency