I've always been intrigue with this method of identifying breakup modes in cone drivers.
www.sugawara-labs.co.jp/en/application_xenonflashes/direct_observation_of_speaker_cone_vibrations
When I consulted with a few independent speaker designers back in the late 80s to early 90s, we used modified ignition timing lights to check the performance of various cone geometries and materials in LF drivers to find their limitations when operating out of their designated bandwidth at higher drive levels. I got the idea from designing and testing light weight valvetrains used in high rpm race engine applications ie. Spintron testing. You'd be shocked how bad the cone of an LF cone driver deforms at higher output levels and various frequencies.
I remember KEF and B&W doing laser interferometry research many decades ago. I'm surprised this area of technology hasn't filtered down into the diy crowd yet with all the access we now have to information pertaining to speaker building.
www.sugawara-labs.co.jp/en/application_xenonflashes/direct_observation_of_speaker_cone_vibrations
When I consulted with a few independent speaker designers back in the late 80s to early 90s, we used modified ignition timing lights to check the performance of various cone geometries and materials in LF drivers to find their limitations when operating out of their designated bandwidth at higher drive levels. I got the idea from designing and testing light weight valvetrains used in high rpm race engine applications ie. Spintron testing. You'd be shocked how bad the cone of an LF cone driver deforms at higher output levels and various frequencies.
I remember KEF and B&W doing laser interferometry research many decades ago. I'm surprised this area of technology hasn't filtered down into the diy crowd yet with all the access we now have to information pertaining to speaker building.
Likely the same reason anechoic chambers aren’y very commonnly used in DIY. It costs a lot of money.
dave
I saw that when I searched yesterday. It looks like a useful tool to have. There are phone apps that will do similar but obviously not as bright or user friendly.
Thats probably the case, although you'd think the technology would be cheaper these days with abundance of dsp capabilities not before had to the average individual.
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The laser and computer bits will be less, but the isolation table will be more expensive than they were in the past.
dave
Only saw the one little animated gif so basing comments on only that, but from early 90's (work-lab) memories, it seems very hard to hone-in on vibration modes. I know we did it in the dark and twiddled excitation to really focus and it wasn't subtle. Then-again, it wasn't 80 bucks. Actually thought someone here (diyA) would've hatched something suitable as it seems in the wheelhouse of many members.
Thing is, as-ever, what happens when the dog finally catches the car? In that respect, it's (arguably) less-useful standalone but still needs to be paired with (structural) sims for which verification is always desirable.
That-said, glad they offer something accessibly-priced to diy'ers.
Thing is, as-ever, what happens when the dog finally catches the car? In that respect, it's (arguably) less-useful standalone but still needs to be paired with (structural) sims for which verification is always desirable.
That-said, glad they offer something accessibly-priced to diy'ers.