White noise excitation for frequency response of ultrasound Ttransducer.
My present method consists in (for transducer working a center frequency f):
1. Modulate a sine with white noise.
2. Send signal with emitter.
3. Receive signal with receiver.
4. Acquire reception.
5. Demodulate with sine.
6. Remain with only the white noise response which is h(t) of the transducer.
This would be used to characterize the transducer. Is there anything wrong with this approach? And if so, what step should be added/removed. Feedback required.
Indeed. I was actually trying to say that the proposed method aims to characterize the ensemble emitter-receptor. I'm interested in determining the h(t) of the emitter+receptor.
No. Everything went as expected. I just want to mention that the signal remaining after the demodulation is processed (in relation to the input) with the System Identification Tool in Matlab, in order to obtain the desired model.
The standard and easier methodology for obtaining the frequency response of an ultrasound transducer is to drive it with a very short-time electrical pulse (spike), typically with a duration minor that -a quarter of the wavelength al the nominal tranducer frequency-, and then to see its echo-response (from a parallel reflector) in a oscilloscope. Finally, to make the FFT transform of the echo pulse properly windowed.
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