I am working in the area of aerospace vibration testing and we use swept sine tests on structures and measure the response using the accelerometers. I tried implementing the technique "Simultaneous measurements of impulse response and distortion with a swept sine technique" for analysis of the response acquired for a swept sine test. In the analysis we basically try to plot the accelerometer amplitude response versus frequency. I could plot the straight spectrum. However, a change in the amplitude in the accelerometer response causes a change in the amplitude of the plot. Is there any way for amplitude scaling in the mentioned technique. i.e if I increase the amplitude of the swept sine to some X value, then the final FFT spectrum of impulse response also should have the same X amplitude. Please let me know.

  • $\begingroup$ I am confused by your question, is it that you are trying to normalize your system for the response of the accelerometer? (Such that you are only seeing the amplitude variation from your DUT?) $\endgroup$ – Dan Boschen Sep 18 '20 at 22:29

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