Difference: 20161209_MSciSpectroscopyMeeting (1 vs. 4)

Revision 419 Jan 2017 - JamesAngthopo

Line: 1 to 1
 
META TOPICPARENT name="StewartBoogertSpectroscopy2016"
Pxiel to wavelength
  • Used equation,

Revision 309 Dec 2016 - JamesAngthopo

Line: 1 to 1
 
META TOPICPARENT name="StewartBoogertSpectroscopy2016"
Pxiel to wavelength
  • Used equation,
Line: 6 to 6
 
  • Cut off point= -0.05, $x(i+\Delta x) - x(i-\Delta x), \Delta x=1$, minimum x range to be considered a peak=2.
  • $C_n$ coefficient, equal to the gradient of the plot for pixel and wavelength values. $p$ is the pixel values. $\alpha$ is another scaling coefficient as moving 1mm does not move pixel by 1pixel. m is the micrometer setting. n is the order of polynomial
Added:
>
>
  • Plot for Helium spectrum:
    wavelength.png
 Behaviour

  • Helium line at 4.20mm:
    He_0420_raw.png
Line: 16 to 18
 
  • Helium spectrum at 7.80mm:
    He_spectrum_0780.png
  • Sigma value of 7 pixels
Deleted:
<
<
 -- JamesAngthopo - 09 Dec 2016
Added:
>
>
 
META FILEATTACHMENT attachment="latexb8cf3e63d4b50c887576a71a6a663d58.png" attr="h" comment="" date="1481284529" name="latexb8cf3e63d4b50c887576a71a6a663d58.png" user="zyvb137" version="1"
Changed:
<
<
META FILEATTACHMENT attachment="wavelength.png" attr="" comment="Plot of Helium spectrum at 6.00mm in micrometer setting in wavelength" date="1481285302" name="wavelength.png" path="wavelength.png" size="87724" user="zyvb137" version="1"
>
>
META FILEATTACHMENT attachment="wavelength.png" attr="" comment="Plot for Helium spectrum" date="1481291901" name="wavelength.png" path="wavelength.png" size="88049" user="zyvb137" version="2"
 
META FILEATTACHMENT attachment="latex76f1e7c31cb6a0ac7e3fad4e4e6c9287.png" attr="h" comment="" date="1481285651" name="latex76f1e7c31cb6a0ac7e3fad4e4e6c9287.png" user="zyvb137" version="1"
META FILEATTACHMENT attachment="latex38c37fa8d4b7d11dc95dc382ff6226fb.png" attr="h" comment="" date="1481290920" name="latex38c37fa8d4b7d11dc95dc382ff6226fb.png" user="zyvb137" version="1"
META FILEATTACHMENT attachment="latexc5f1954d4836c0241e536d7383bf2f3c.png" attr="h" comment="" date="1481290920" name="latexc5f1954d4836c0241e536d7383bf2f3c.png" user="zyvb137" version="1"

Revision 209 Dec 2016 - WilliamBurrows

Line: 1 to 1
 
META TOPICPARENT name="StewartBoogertSpectroscopy2016"
Pxiel to wavelength
  • Used equation,
Line: 6 to 6
 
  • Cut off point= -0.05, $x(i+\Delta x) - x(i-\Delta x), \Delta x=1$, minimum x range to be considered a peak=2.
  • $C_n$ coefficient, equal to the gradient of the plot for pixel and wavelength values. $p$ is the pixel values. $\alpha$ is another scaling coefficient as moving 1mm does not move pixel by 1pixel. m is the micrometer setting. n is the order of polynomial
Added:
>
>		Behaviour
 
Changed:
<
<
Actual wavelength (nm)
447
471
492
501
>
>
  • Helium line at 4.20mm:
    He_0420_raw.png
  • Sigma value of 3 pixels

  • Helium spectrum at 0.50mm:
    He_spectrum_0050.png
  • Sigma value of 6 pixels

  • Helium spectrum at 7.80mm:
    He_spectrum_0780.png
  • Sigma value of 7 pixels
  -- JamesAngthopo - 09 Dec 2016
Line: 21 to 25
 
META FILEATTACHMENT attachment="latex38c37fa8d4b7d11dc95dc382ff6226fb.png" attr="h" comment="" date="1481290920" name="latex38c37fa8d4b7d11dc95dc382ff6226fb.png" user="zyvb137" version="1"
META FILEATTACHMENT attachment="latexc5f1954d4836c0241e536d7383bf2f3c.png" attr="h" comment="" date="1481290920" name="latexc5f1954d4836c0241e536d7383bf2f3c.png" user="zyvb137" version="1"
META FILEATTACHMENT attachment="latex2c3b61b8039918250d7d1bb7836bfc1b.png" attr="h" comment="" date="1481290921" name="latex2c3b61b8039918250d7d1bb7836bfc1b.png" user="zyvb137" version="1"
Added:
>
>
META FILEATTACHMENT attachment="He_0420_raw.png" attr="" comment="Helium line at 4.20mm" date="1481291401" name="He_0420_raw.png" path="He_0420_raw.png" size="27573" user="zyvb951" version="1"
META FILEATTACHMENT attachment="He_spectrum_0050.png" attr="" comment="Helium spectrum at 0.50mm" date="1481291644" name="He_spectrum_0050.png" path="He_spectrum_0050.png" size="42207" user="zyvb951" version="1"
META FILEATTACHMENT attachment="He_spectrum_0780.png" attr="" comment="Helium spectrum at 7.80mm" date="1481291759" name="He_spectrum_0780.png" path="He_spectrum_0780.png" size="42675" user="zyvb951" version="1"

Revision 109 Dec 2016 - JamesAngthopo

Line: 1 to 1
Added:
>
>
META TOPICPARENT name="StewartBoogertSpectroscopy2016"
Pxiel to wavelength
  • Used equation,
\begin{equation} \lambda= \sum_{n=1}^{n}C_n(p-\alpha m)^n \end{equation}

  • Cut off point= -0.05, $x(i+\Delta x) - x(i-\Delta x), \Delta x=1$, minimum x range to be considered a peak=2.
  • $C_n$ coefficient, equal to the gradient of the plot for pixel and wavelength values. $p$ is the pixel values. $\alpha$ is another scaling coefficient as moving 1mm does not move pixel by 1pixel. m is the micrometer setting. n is the order of polynomial

Actual wavelength (nm)
447
471
492
501

-- JamesAngthopo - 09 Dec 2016

META FILEATTACHMENT attachment="latexb8cf3e63d4b50c887576a71a6a663d58.png" attr="h" comment="" date="1481284529" name="latexb8cf3e63d4b50c887576a71a6a663d58.png" user="zyvb137" version="1"
META FILEATTACHMENT attachment="wavelength.png" attr="" comment="Plot of Helium spectrum at 6.00mm in micrometer setting in wavelength" date="1481285302" name="wavelength.png" path="wavelength.png" size="87724" user="zyvb137" version="1"
META FILEATTACHMENT attachment="latex76f1e7c31cb6a0ac7e3fad4e4e6c9287.png" attr="h" comment="" date="1481285651" name="latex76f1e7c31cb6a0ac7e3fad4e4e6c9287.png" user="zyvb137" version="1"
META FILEATTACHMENT attachment="latex38c37fa8d4b7d11dc95dc382ff6226fb.png" attr="h" comment="" date="1481290920" name="latex38c37fa8d4b7d11dc95dc382ff6226fb.png" user="zyvb137" version="1"
META FILEATTACHMENT attachment="latexc5f1954d4836c0241e536d7383bf2f3c.png" attr="h" comment="" date="1481290920" name="latexc5f1954d4836c0241e536d7383bf2f3c.png" user="zyvb137" version="1"
META FILEATTACHMENT attachment="latex2c3b61b8039918250d7d1bb7836bfc1b.png" attr="h" comment="" date="1481290921" name="latex2c3b61b8039918250d7d1bb7836bfc1b.png" user="zyvb137" version="1"
View topic | History: r4 < r3 < r2 < r1 | More topic actions...
 
This site is powered by the TWiki collaboration platform Powered by PerlCopyright © 2008-2022 by the contributing authors. All material on this collaboration platform is the property of the contributing authors.
Ideas, requests, problems regarding RHUL Physics Department TWiki? Send feedback