Dark Verification, 70µm

Principal: Karl Gordon
Deputy: Karl Misselt, Dave Frayer
Data Monkey(s):
Priority: Normal
Downlink Priority: Normal
Analysis Time: 24
Last Updated:

Objective

The purpose of this task is to verify that the normal 10 second, 70µm dark current image can be used to calibrate the 3 and 4 second DCEs.

Description

Point to the primary 70µm dark position (#1) and take dark measurements using the 3, 4, & 10 sec Dark IERs.

Point to the secondary 70µm dark position (#2) and take dark measurements using the 3, 4, & 10 sec Dark IERs.

Data Collected

The dark current datasets will each contain 35 DCEs with stim flashes every 11 DCEs. The two 70µm dark positions will result in two such datasets for each exposure time.

Data Reformatting Requirements

Array Data Desired:

70 µm

Data Reformatting Option:

Special Instructions:
The 35 dark current DCEs should be packed into a single FITS file with extensions. This would generate two such FITS files for each exposure time (a total of 6 files for this task) as there are two dark positions for the 70µm array.

Task Dependencies

Calibration Dependencies

Output and Deliverable Products

The output of each dark current dataset is a dark current calibration image. After merging the two dark positions for each exposure time, this will result in dark calibration images for 3, 4, and 10 seconds. Ratios of the 3 and 4 second images to the 10 second image will be examined. If significant deviations from 1 are found in these ratio images, then dark current calibration images will need to be generated for each exposure time instead of using a single calibration image.

Data Analysis

The dark current datasets will be run through mips_sloper, mips_caler, and mips_enhancer with the appropriate switches. The script 'mips_makedark_ge' will be used to ensure that all the appropriate switches are set to these three programs. The dark calibration image will be created by mips_enhancer and will include uncertainties. The IDL program 'merge_dark70' will be used to merge the two dark positions into a single calibration image. IDL will be used to make the ratio images (3 sec/10 sec and 4 sec/10 sec) and produce histograms of the resulting ratio images.


Software Requirements

Actions Following Analysis

If the ratio images are found to be equivalent to flat images with a value of 1, then no furthur action is required. If this is not the case, then the 10 second dark calibration image will need to be scaled to produce 3 and 4 second dark calibration images each time a 10 second dark calibration image is produced. If the 10 second dark calibration images are found to significantly variable between campaigns, it might be useful to run this task at least once more to ensure that the scaling between exposure times is not changing.

Failure Modes and Responses

If this task fails to produce useful data, it should be repeated.

Additional Notes