Has anyone here worked with high-resolution FFT spectrum analysis for acoustic or electromagnetic measurements?
Specifically I am looking for experience with:
FFT sizes of 1,048,576 points or larger
Spectral resolution in the sub-Hz range (0.1 – 1 Hz per bin)
Signal acquisition at sample rates of 100 kHz – 2 MHz
Measuring resonant frequency signatures of physical objects with precision better than 1 Hz
I am designing an experiment to detect location-dependent frequency shifts in the acoustic resonant signature of a hollow copper sphere using a 40 kHz ultrasonic transducer.
If you have experience with high-resolution spectral analysis, signal acquisition hardware, or acoustic measurement methodology — I would love explore opportunities.