hello everyone.
on the net you can find programs that use the laser to make measurements on the speakers. this method is considered very precise. what is your opinion on this topic?.
an example in the link below:
https://www.listeninc.com/products/...hragm-displacement-measurement-using-a-laser/
i have to make measurements to obtain the small-thiele parameters.
do you know of an open source or free program that does this?.
i think that in addition to the program and the laser source, something is needed to collect the signal and then pass it to the sound card.
i have already read the following page on this forum but i would like to know if there are other alternatives:
https://www.soundanalog.com/projects/project-one-f5w4d-6xm4j
hello and thanks.
on the net you can find programs that use the laser to make measurements on the speakers. this method is considered very precise. what is your opinion on this topic?.
an example in the link below:
https://www.listeninc.com/products/...hragm-displacement-measurement-using-a-laser/
i have to make measurements to obtain the small-thiele parameters.
do you know of an open source or free program that does this?.
i think that in addition to the program and the laser source, something is needed to collect the signal and then pass it to the sound card.
i have already read the following page on this forum but i would like to know if there are other alternatives:
https://www.soundanalog.com/projects/project-one-f5w4d-6xm4j
hello and thanks.
DATS3 is what I use. Not free. Made by dayton audio.
When I saw your thread title I thought of something else. I use a laser distance meter to measure the mic to the baffle.
IMO T/S params are nice to measure but if you use a good manufacturer the provided params are good enough to make a decision before buying any driver. For example, you could know what eq + T/S params do to a driver in the same box and see the GD in vcad.
I think a measurement from a mic > T/S params- even if they are incredibly precise. The params are used to make a choice before I can measure with a mic.
Howdy!
Yes, laser scanning a driver is very useful if you need to know its real excursion. Or potentially to get a look at the shape of its break-up modes. All very cool and although I don't need one, I wouldn't object to have a tool like that in my lab.
If you are wanting to measure Thiele-Small parameters a laser is entirely unnecessary. Even if you want very high precision. As was mentioned, REW is a free program that will do it, plus a few dollars for the parts to make a hardware jig.
Note that the value of laser scanning a driver mostly comes when investigating a driver's performance at high signal levels, for example, finding its linear excursion limits. T/S parameters, on the other hand, characterize a driver at low signal levels and describe properties that can be obtained purely electrically.
They are typically referred to as "laser vibrometers" and have been around in commercial and/or DIY/lab form for perhaps 50 years leading to there being a reasonable amount of secondhand parts around on ebay or equivalent. A reasonable entry level system might be £1k perhaps a bit less if you hunt around. This is just about viable to support a hobby interest if they were necessary/important but, as others have mentioned, there are alternatives. They would likely be most useful for checking cabinet vibration rather than cone motion which is easy enough to measure with a microphone (which is necessary/important to support the hobby).
Back in the day (mid-70s) we would attach a small mirror to the woofer and aim a laser at it while playing music. It would create mesmerizing patterns on the walls and ceiling that were best viewed with blotter-enhanced vision.