Re: Beam width
- From: Fred Bloggs <nospam@xxxxxxxxxx>
- Date: Sun, 11 Feb 2007 00:21:45 GMT
default wrote:
On 10 Feb 2007 06:21:56 -0800, "Adam" <Adam820820@xxxxxxxxx> wrote:
Hello everybody,
I have heard that in the radar and radio communication there is a law
of radiation. The larger aperture of the aerial (or the more number of
the aerial)
The narrower beam you'll have. As I have heard it is true for NDE
ultrasonic transducer which means if you use an array of transducers
you'll have a narrower beam of ultrasound rather than using just one
of those transducers. I am not able to understand the reason?
It seems there is a paradox there!
Suppose an ultrasonic transducer has 60 degrees of beam width, if you
use an array of 500 of these transducers then you'll get 5 degrees of
beam width or even less while you have a very much large array instead
of just one transducer!!!
Is there anyone to direct me why the beam separation is much less for
an array of transducers rather than just one transducer?
Many thanks for any help
http://en.wikipedia.org/wiki/Phased_array
What about this one http://en.wikipedia.org/wiki/Diffraction
.
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