We examined how well we could move the calibration wheel from the blackbody to a different location on the calibration wheel with the EXES GUI (gas cell/black foam, sky, home) back to the blackbody. This was performed in order to determine how well we could avoid having any of the retaining points on the blackbody during observation without a collimating lens. An image was taken each time we returned to the blackbody. After every fifth move the calibration wheel was commanded to the home position in lab view before returning to the blackbody position to be imaged.
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| Postage stamp images of the blackbody. The moves done prior to the imaging are given above. "GC" corresponds to the "gas cell" option in the EXES GUI. The dashed black circle indicates where contribution from a retaining bolt is seen. "Home (LV)" corresponds to when the home position was returned to via Lab View (LV). |
We also looked at voltage read by the potentiometer associated with moves the calibration wheel before each observation of the blackbody was taken:
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| Plot of voltages over our imaging sequence. White squares indicate clean blackbody observation, while red squares indicate some part of a retaining bolt was also imaged. The green dashed line shows the median voltage value and the yellow dashed lines are +/- 1 standard deviation (rms). |
1 comment:
Is the conclusion then that we should aim for a voltage at 7.757 V +- 0.003? Can we do that fine an adjustment by making a second move?
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