Measuring wavefront of compression driver possible?

[mefistofelez]

Greetings all,

as the title suggests, I was wondering if it is possible to measure a compression driver (2inch) wavefront shape?

If so, could anyone suggest practical method?

Thank you,

M

[gedlee]

There are direct and indirect methods. The direct method requires some very specialized measurement equipment called a "microflown" which measures air partical velocity directly. Then you need to moutn this on a some sort of scanning system. This was done by a guy name Behler from Auchen. He had some AES papers on this.

The indirect method requires that you have a known load on the divice most easily a plane wave tube. By measuring the response at severla location along and arround the tube one can calcultae the shape of the wavefront. But of course this later methiod involves a lot of math and careful measurements.

So the choices are spend a lot of money on equipment or a lot of time on the calculations. There is no simple method.

[mefistofelez]

Dr. Geddes,

thank you for the reply. Are there any references regarding the latter mentioned method?

Kindest regards,

M

[gedlee]

No, not the later. I have done the calculations but they were never published. I always wanted to develop the technique, but then there are lots of things that I would "like to do".

[mefistofelez]

Dr. Geddes,

thank you for the reply. I might not express myself correctly. I did not mean your own reference, just any would suffice, as I do not seem to be able to find anything along those lines.

I will keep searching.

Kindest regards,

M

[gedlee]

I understood perfectly. There isn't anything in print (publicely), by me or anyone else. I did this work under contract.

[mefistofelez]

Well, as comrade Alighieri would say

All hope abandon ye who enter here.

Kindest regards,

M

[Radugazon]

Infernal...

[gedlee]

I would be happy to outline the tasks involved, but I can't do the actually coding for the analysis. Thats beyond on time allocation for "free work"! Let me know if that interests you.

[mefistofelez]

Dr. Geddes,

thank you for the offer. I would appreciate if you could provide the outline, so that I understand the coding requirements.

Would the coding require a use of a programming language or would a software package, i.e., Matlab, MatCAD, suffice?

If you feel that the discussion will become too involved, please use pm so that we do not unnecessarily clutter the forum.

Kindest regards,

M