REVISION DATE: 09-May-2016 15:10:08

 
Part of an Email from Casey Smith on 7/1/2015 3:15 PM:
The "sphere" cube has all of the channels illuminated.  "Channel 7" is only 7, obviously.  Helium red and helium blue show the same 
helium discharge spectra at different integration levels in order to get data in the blue where the signal is weaker.
MIKES EMAIL ------------------  
I looked at the NIST Atomic Spectra Database for Helium lines (in-air, nm)  
( http://www.nist.gov/pml/data/asd.cfm,  "Lines",  "He I,   500 to 1000 nm"  )  

Casey send four bip files (channel7.bip helium blue.bip helium red.bip sphere.bip).

Below are my graphs of the helium blue.bip. The file contains 3 images of the helium lamp source. The red side is saturated so this file shows the blue lines See each graph below for more detail.

I took the 3 images and meaned them to get the surface plot below. You can see here the red lines are saturated so this is for the blue lines

Figure 1

This is a cross section through the tracks at wavelength pixel 474, with one line for each of the 3 images. The tracks and their shapes look really stable.

Figure 2

Same as the previous graph but zoomed into the bottom to see the level of the darks between the tracks.

Figure 3

Same as figure 2 but for Wavelength pixel 148.

Figure 4

Again this is the mean image with slices thought the image at different wavelength pixels. The pixels choosen are where the helium peaks are and +- pixel pixel around them.

Figure 5

Same as figure 5 but zoomed to the bottom so you can see the darks between the tracks.

Figure 6

Helium Peak 1 (at pix 147): The same surface plot but showing how individual helium peaks line up from track to track. Looks pretty good!

Figure 7

Helium Peak 2 (at pix 318): The same surface plot but showing how individual helium peaks line up from track to track. Looks pretty good!

Figure 8

Helium Peak 3 (at pix 474): The same surface plot but showing how individual helium peaks line up from track to track. Looks pretty good!

Figure 9

Mean image binned by track, the x-axis is wavelength pixels.

Figure 10

Close up of one of the helium peaks

Figure 11

Close up of one of the helium peaks

Figure 12

Close up of one of the helium peaks

Figure 13

MY VERY ROUGH GUESS AT A WAVELENGTH CAL!!! THIS ASSUMES I GUESS CORRECTLY WHICH PEAKS WHERE WHICH HELIUM LINES.

Wavelength cal coeff
P(1,:) = [0.344433 338.043 ];
P(2,:) = [0.344525 338.024 ];
P(3,:) = [0.344582 337.973 ];
P(4,:) = [0.344484 338.016 ];
P(5,:) = [0.344507 338.012 ];
P(6,:) = [0.344533 338.019 ];
P(7,:) = [0.344436 337.999 ];
P(8,:) = [0.344621 337.987 ];
P(9,:) = [0.344653 337.968 ];
P(10,:) = [0.34485 337.905 ];
P(11,:) = [0.344632 337.959 ];
P(12,:) = [0.344646 337.962 ];
P(13,:) = [0.344695 337.935 ];
P(14,:) = [0.344734 337.934 ];
Track, Min,    Max,     diff
    1, 338.39, 690.74,  0.34
    2, 338.37, 690.82,  0.34
    3, 338.32, 690.83,  0.34
    4, 338.36, 690.77,  0.34
    5, 338.36, 690.79,  0.34
    6, 338.36, 690.82,  0.34
    7, 338.34, 690.70,  0.34
    8, 338.33, 690.88,  0.34
    9, 338.31, 690.89,  0.34
   10, 338.25, 691.03,  0.34
   11, 338.30, 690.86,  0.34
   12, 338.31, 690.88,  0.34
   13, 338.28, 690.90,  0.34
   14, 338.28, 690.94,  0.34

Figure 14

  Track = The Resonon Track number  
Lwave = Laser Wavelength 
Lpix1 = Laser Pixel found using the max value of the track 
Lpix2 = Laser Pixel found using mygaussfit to fit the laser peak