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| META TOPICPARENT |
name="StewartBoogertSpectroscopy2015" |
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<
< | Initially the fits file was loaded into python, the image was then projected onto the x-axis to obtain a spectrum. This was plotted with N_{adu} against position, so from the eqaution N_{pe} = 2.3*N_{adu} the data was plotted against N_{pe}. |
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> | Spectrum
Initially the fits file was loaded into python, the image was then projected onto the x-axis to obtain a spectrum. This was in the units of N_{adu} against position, so from the eqaution N_{pe} = 2.3*N_{adu} the data was plotted in N_{pe} against position.
- Cadmium_spectrum.png:
Background
To calculate the background of the data, the position between 350 and 500 was selected, this have a plot of which had a bright pixel as shown,
- Background with bright pixel:
by ommiting the bright pixel a histogram of the data could be plotted.
- Background histogram:
The mean and the standard deviation were calculated using the numpy package and were equal to:
mean = 149775.0,
stdev = 20571.1,
however for a poisson distribution where,
f(n,l) = (l^n)( e^{-l})/(n!)
l is equal to the expextation value and the variance, therefore for the distribution to be poisson the mean should be equal to the square of the standard deviation. |
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-- JosephBayley - 13 Oct 2015
| META FILEATTACHMENT |
attachment="Cadmium_spectrum.png" attr="h" comment="" date="1444724881" name="Cadmium_spectrum.png" path="Cadmium_spectrum.png" size="74235" user="zxap044" version="1" |
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| META FILEATTACHMENT |
attachment="Background_cadmium_plot.png" attr="h" comment="Background with bright pixel" date="1444735056" name="Background_cadmium_plot.png" path="Background_cadmium_plot.png" size="63206" user="zxap044" version="1" |
| META FILEATTACHMENT |
attachment="Background_cadmium_histogram.png" attr="h" comment="Background histogram" date="1444735377" name="Background_cadmium_histogram.png" path="Background_cadmium_histogram.png" size="41881" user="zxap044" version="2" |
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