Timeline for Appropriate model of an unknown sonar piezo
Current License: CC BY-SA 4.0
7 events
| when toggle format | what | by | license | comment | |
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| Jun 4, 2019 at 15:55 | comment | added | Ramiro Vargas | I have a digital controlled wave generator thar can go up 1MHz. It is designed to work with arduino. Reading about the device I got the piezo from, it seems to work at 85/200KHz | |
| Jun 4, 2019 at 9:09 | comment | added | Marcus Müller | however, you're right, every audio device will probably have their analog cut off at around 16 kHz. | |
| Jun 4, 2019 at 9:08 | comment | added | Marcus Müller | However, the jitter aspect is an interesting one: jitter / phase noise of course tend to slightly shape noise. However, since we're really not doing coherent detection, but would just be observing the output spectrum as a whole, I'd doubt that at the resonant frequencies, that slight amplitude distortion really matters for identification purposes. | |
| Jun 4, 2019 at 9:07 | comment | added | Marcus Müller | You wouldn't need to make the tones isolatedly – a sufficiently long pseudo-white signal would contain both frequencies (and frequencies between at a resolution only limited by the length). | |
| Jun 4, 2019 at 9:05 | comment | added | Bimpelrekkie | @MarcusMüller Assuming the resonance is at 17 kHz: if this would work might depend on how "good" the signal from a soundcard is at 17 kHz. I doubt if a soundcard can make a "jitter free" 17.000 kHz and also 17.001 kHz. My feeling is that we'd need a DDS for this. | |
| Jun 4, 2019 at 8:59 | comment | added | Marcus Müller | ah! so, good models exist, but they've got hard to determine parameters. In this case, since the bandwidth of this thing is rather limited: Wouldn't a wideband/white excitation signal coming from a soundcard make a rather nice test signal, and a soundcard line input make a rather nice digitizer? One could make a rather long recording to achieve near-perfect frequency resolution. | |
| Jun 4, 2019 at 8:21 | history | answered | Bimpelrekkie | CC BY-SA 4.0 |