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Technical Discussions
Ekeom Didace
Ekeom Didace
16:08 Feb-11-2010
Beam Forming

Hello,

Do someone know where I can find basic (fundamental theory) on beam forming and steering. For example how to choice the f-number at a given frequency, for target beam size?

Best regards,

Didace

    
 
 Reply 
 
Tom Nelligan
Engineering,
retired, USA, Joined Nov 1998, 390

Tom Nelligan

Engineering,
retired,
USA,
Joined Nov 1998
390
17:16 Feb-11-2010
Re: Beam Forming
In Reply to Ekeom Didace at 16:08 Feb-11-2010 (Opening).

If you are asking about conventional single element transducers as opposed to phased arrays, you will find the equations in section 2(d) of the technical notes portion of the Panametrics-NDT transducer catalog, which you can download at

www.olympus-ims.com/panametrics-ndt-ultrasonic/pdf/

    
 
 Reply 
 
Ekeom Didace
Ekeom Didace
17:30 Feb-11-2010
Re: Beam Forming
In Reply to Tom Nelligan at 17:16 Feb-11-2010 .

Hello,

Thank for your answer. I'm asking about phased-arrays transducers focalisation.

Best regards,

Didace

    
 
 Reply 
 
Wieslaw Bicz
Engineering,
PBP Optel sp. z o.o., Poland, Joined Feb 2009, 256

Wieslaw Bicz

Engineering,
PBP Optel sp. z o.o.,
Poland,
Joined Feb 2009
256
18:02 Feb-11-2010
Re: Beam Forming
In Reply to Ekeom Didace at 17:30 Feb-11-2010 .

The basic theory of beam forming is easy to find. For example in Wikipedia, but also at many other places in the web and in different books and papers, describing medical or other ultrasonic devices.

The exact description is very complicated, because it must include also the real function of each transducer element and the propagation of sound in the medium. There are many papers dealing with this problem.

    
 
 Reply 
 
Ekeom Didace
Ekeom Didace
20:00 Feb-11-2010
Re: Beam Forming
In Reply to Wieslaw Bicz at 18:02 Feb-11-2010 .

Dear Wieslaw Bicz,

I was on Wikipedia. It is not that help full. I will appreciate if you can send me some refences.

Best regards,

Didace

    
 
 Reply 
 
Wieslaw Bicz
Engineering,
PBP Optel sp. z o.o., Poland, Joined Feb 2009, 256

Wieslaw Bicz

Engineering,
PBP Optel sp. z o.o.,
Poland,
Joined Feb 2009
256
21:09 Feb-11-2010
Re: Beam Forming
In Reply to Ekeom Didace at 20:00 Feb-11-2010 .

This article contains very useful links:

http://en.wikipedia.org/wiki/Phased_array_ultrasonics

But interesting are also:

http://en.wikipedia.org/wiki/Aperture_synthesis
http://en.wikipedia.org/wiki/Beamforming
http://en.wikipedia.org/wiki/Phased_array
http://en.wikipedia.org/wiki/Wave_field_synthesis


And many more.

Beamforming as the method of aperture synthesis is used in many areas: in radars, sonars, in seismic methods and is from this point of view interesting for many people.

This is the reason, why it is possible to find large amount of information about this technique.

    
 
 Reply 
 
Ekeom Didace
Ekeom Didace
20:04 Feb-12-2010
Re: Beam Forming
In Reply to Wieslaw Bicz at 21:09 Feb-11-2010 .

Dear Wieslaw Bicz,

Thank you very much for your help.

Best regards,

Didace

    
 
 Reply 
 
Linxiao Yu
R & D, NDE in Oil & Gas; Energy; Manufacturing
BP, USA, Joined Aug 2006, 13

Linxiao Yu

R & D, NDE in Oil & Gas; Energy; Manufacturing
BP,
USA,
Joined Aug 2006
13
22:14 Feb-12-2010
Re: Beam Forming
In Reply to Ekeom Didace at 16:08 Feb-11-2010 (Opening).

I've done some research on the similar topic before and I have a short summary on how to calculate the time delay (to focus and steer the sound beam) for linear array. Shot me an email if this is what you are looking for.

Linxiao

    
 
 Reply 
 
Ekeom Didace
Ekeom Didace
16:57 Feb-13-2010
Re: Beam Forming
In Reply to Linxiao Yu at 22:14 Feb-12-2010 .

Dear Linxiao,

Thank you very much for your help. Here is my e-mail address :

didace.ekeom@microsonics.fr

or

ekeom@yahoo.fr

Best regards,

Didace

    
 
 Reply 
 

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