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Joe,
Thank-you very much for the help.
I think I've gotten my head around extracting the d-spacing. But I'm not
sure about the error.
Which points of a line profile over the fft would correspond to the error?
Is there a more in depth tutorial on looking at spacing in this manner?
Lewis
On 31/08/2011 22:35, Joe Smerdon wrote:
> for a large scale image with lots of information, a 2d fft should show
> a (diffuse) ring of intensity showing the average (inverse) spacing.
> a line profile over the diffuse ring might give you something to fit
> to find the error on the measurement.
>
> if i open your phase image, then do a 2d fft, then use the colour tool
> to optimise the colour range, i find a domain of intensity clustered
> around the middle - this (obv) is related only to the low frequency
> information and the stuff around the outside is related to the high
> frequency (to pick the frequency range you are interested in you can
> use fft filtering). well, the lowest frequency stuff i can find in the
> image is the domain spacing, so i just pick the frequency that fits
> the domain of intensity, invert it and i get an average spacing for
> your image of about 14 nm. a line profile of the fft gives me an
> error of about 1 order of magnitude, so about 1.4 nm.
>
> hth
>
> joe
>
> On 31 August 2011 14:39, Lewis Williams
> <[email protected]
> <mailto:[email protected]>> wrote:
>
> I was wondering if somebody could help me with the correct/best way to
> process my images.
>
> I'm trying to extract the average domain spacing from tapping mode AFM
> images.
> I have a lamellae structure, and I'd like to know the average
> interdomain spacing.
>
> I can extract a profile and then measure peak to peak and then average
> the values, but this is only averaged in 1 dimension over a chosen
> profile.
>
> Please advise.
>
> Sincerely,
> Lewis
>
>
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Joe,<br>
Thank-you very much for the help.<br>
<br>
I think I've gotten my head around extracting the d-spacing. But I'm
not sure about the error.<br>
Which points of a line profile over the fft would correspond to the
error?<br>
<br>
Is there a more in depth tutorial on looking at spacing in this
manner?<br>
<br>
Lewis<br>
<br>
On 31/08/2011 22:35, Joe Smerdon wrote:
<blockquote
cite="mid:caf0lxomi4b2omlkzmcnymn8tfufcksetjv1c6o0djjdgzs+...@mail.gmail.com"
type="cite">for a large scale image with lots of information, a 2d
fft should show a (diffuse) ring of intensity showing the average
(inverse) spacing. a line profile over the diffuse ring might
give you something to fit to find the error on the measurement. <br>
<br>
if i open your phase image, then do a 2d fft, then use the colour
tool to optimise the colour range, i find a domain of intensity
clustered around the middle - this (obv) is related only to the
low frequency information and the stuff around the outside is
related to the high frequency (to pick the frequency range you are
interested in you can use fft filtering). well, the lowest
frequency stuff i can find in the image is the domain spacing, so
i just pick the frequency that fits the domain of intensity,
invert it and i get an average spacing for your image of about 14
nm. a line profile of the fft gives me an error of about 1 order
of magnitude, so about 1.4 nm.<br>
<br>
hth<br>
<br>
joe<br>
<br>
<div class="gmail_quote">On 31 August 2011 14:39, Lewis Williams <span
dir="ltr"><<a moz-do-not-send="true"
href="mailto:[email protected]";>[email protected]</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex;">
I was wondering if somebody could help me with the
correct/best way to<br>
process my images.<br>
<br>
I'm trying to extract the average domain spacing from tapping
mode AFM<br>
images.<br>
I have a lamellae structure, and I'd like to know the average<br>
interdomain spacing.<br>
<br>
I can extract a profile and then measure peak to peak and then
average<br>
the values, but this is only averaged in 1 dimension over a
chosen profile.<br>
<br>
Please advise.<br>
<br>
Sincerely,<br>
Lewis<br>
<br>
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you<br>
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