Units for a PSD from square of FT?

1. What is the unit of PSD?
2. How is a PSD calculated?
3. How is PSD calculated in FFT?
4. How do you calculate power spectrum from FFT?

What is the unit of PSD?

The power spectral density (PSD) of the signal describes the power present in the signal as a function of frequency, per unit frequency. Power spectral density is commonly expressed in watts per hertz (W/Hz).

How is a PSD calculated?

Summary: Calculating PSD from a Time History File

Frequency-domain data are converted to power by taking the squared magnitude (power value) of each frequency point; the squared magnitudes for each frame are averaged. The average is divided by the sample rate to normalize to a single hertz (Hz).

How is PSD calculated in FFT?

A PSD is computed by multiplying each frequency bin in an FFT by its complex conjugate which results in the real only spectrum of amplitude in g².

How do you calculate power spectrum from FFT?

To get the PSD from your FFT values, square each FFT value and divide by 2 times the frequency spacing on your x axis.