Dark Level

The intensity level of the INGRID darks frames, depends on the temperature of the array. The plots below show this level as a function of the exposure time for different temperatures of the array (72.2K and 79.8K). The median intensity in each quadrant of each dark frame have been calculated (after masking the hot pixels of the array) and plotted with different colours in the figures.

Date: 26 May 2002 Array temperature: 72.2 K	Date: 4 June 2002 Array temperature: 79.8 K

The plots below show the number of hot pixels in each quadrant of the array as a function of the integration time. The plots correspond to different temperatures of the array.

Date: 26 May 2002 Array temperature: 72.2 K	Date: 4 June 2002 Array temperature: 79.8 K