4. Determine Noise at different speed and gain settings

4. Determine Noise at different speed and gain settings

These graphs should determine Noise at different speed and gain settings. See excerpt from Tasks doc below.

I will use Track 1, 4, 7, 10 and 13 to calculate the SNR ratio. I noticed a small sine wave in the dark scans of the Gain 3 Rate 2M darks. There is also a lot of shape in the 2m speed darks (see bottom graph). The first frame is thrown out for all data shown

When doing a preliminary look that the data is was clear that the gain 1 data had a major problem with bloom in the ccd array. Only data less than 12,000 ADu are used from the gain 1 data. (see Exp num 11 graphs)

Resonon tasks_cjcomments.doc

4. Determine Noise at different speed and gain settings

a. Source: Stable broadband, all fibers illuminated I think we should use the OL420 since the stability of the fiber optic illuminator is unknown
b. Image sequence for this test: 10 BI, 10LI, 10BI
c. Integration time for 55K max signal Check at the “cusps” and make sure we are not saturated anywhere
d. Take 1 image set at each speed (100khz, 2Mhz) and gains( 1,2,3) at both speeds.
e.Analysis

i. SNR of spectral Light – dark for one lighted row of pixels for each setting combinations
ii. Goal is to determine if the 2mhz speed is quiet enough to use for future work since it is much faster.

Bloom: A defect obtained with images taken using CCDs (see Charge-Coupled Device), in which bright images have long bars on either side. This is caused when pixels become saturated with charge, which then spills over into adjacent pixels in the column. (http://www.encyclopedia.com/doc/1O80-blooming.html)

pwd: C:\zflora\mldata\MOBY2\Intital_testing\091210
Date: 16-Dec-2009 11:01:20
Created from marktask_4d(1)