Difference: LogBookAstronomyEntry0150 (3 vs. 4)

Revision 423 Jan 2018 - AlanisCozens1

Line: 1 to 1
META TOPICPARENT name="LogBookAstronomy"

Log Book Entry No.150

Days, Calendar Created: 01 Nov 2017 13:28:40 Days, Calendar Last Revised: 23 Jan 2018 19:30:36 Person AlanisCozens1 Text Solar Limb Darkening test data AC LL
Line: 14 to 12
  Weather cloudy, intermittently clear
use DSLR to take white images to look at the natural vignetting effects of the camera, took many exposure times so to get an unsaturated image. Need to process these to get a pixel vs intensity curve to show that the fractional ratio of intensity does not depend on exposure. Also look at different colour channels and create a plot to show all 3
Then set up the telescope so as to record data, fit with sun filters and imaging source camera. Using ICcapture software.
Use shadow of the telescope to align, and adjust further with finder scope.
set telescope to the west of the sun to see it passing through the window, takes around 1min to fully pass no data recorded
Use DSLR to take images of the sun, lowering the exposure times to find an unsaturated image. Use circle finder code to analyse the intensity array across a diameter of the sun.
Attached Text files show the image numbers on the DSLR for varying exposure times ISO=100 for targets of the sun then a white light source evenly lit for investigating the vignetting effect.

Back to: LogBookAstronomy

Line: 30 to 30
META FILEATTACHMENT attachment="convert_raw.py.txt" attr="" comment="code to convert raw data to tiff" date="1509546102" name="convert_raw.py.txt" path="convert_raw.py.txt" size="1267" user="zbvc446" version="1"
META FILEATTACHMENT attachment="Vignetting1.zip" attr="" comment="Correct updated vignetting images" date="1510666956" name="Vignetting1.zip" path="Vignetting1.zip" size="86877993" user="zbvc446" version="1"
META FILEATTACHMENT attachment="Vignetting2.zip" attr="" comment="Correct updated vignetting images" date="1510667019" name="Vignetting2.zip" path="Vignetting2.zip" size="79421175" user="zbvc446" version="1"
META FILEATTACHMENT attachment="SUN_100_EXPVARY.txt" attr="" comment="Image numbers for varying exposure times Target:SUN ISO:100 DSLR" date="1516734711" name="SUN_100_EXPVARY.txt" path="SUN_100_EXPVARY.txt" size="312" user="zbvb025" version="1"
META FILEATTACHMENT attachment="VIGNETTE_100_EXPVARY.txt" attr="" comment="Image numbers for varying exposure times Target:VIGNETTE ISO:100 DSLR" date="1516735835" name="VIGNETTE_100_EXPVARY.txt" path="VIGNETTE_100_EXPVARY.txt" size="218" user="zbvb025" version="1"
This site is powered by the TWiki collaboration platform Powered by PerlCopyright © 2008-2021 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