Sumários

CCDs [Part VI]

10 Outubro 2024, 11:30 • André Maria da Silva Dias Moitinho de Almeida

Beyond basic CCD use
  • Mosaics
  • "Binning". Reasons, advantages and disadvantages. Differences in load transfer / Acquisition / reading
  • Drift mode
  • Video CCDs

Instruments
  • Photometers and cameras
  • Spectrographs

Further reading
Chap 5 of McLean

CCD image processing (Part II)

8 Outubro 2024, 09:00 • André Maria da Silva Dias Moitinho de Almeida

  • Explanation of the astropy CCDPROC task. 
  • Explanation of different image combination algorithms, including outlier rejection.
  • Image processing:
    • Definition of the geometry of the overscan area and the data area.
    • Calculation and correction of the overscan level. 
    • Trimming the overscan section
    • Examination of processed images
    • Combination of bias images into a master bias. 
    • Comparison of the combined image with the individual ones (noise reduction).

CCDs [Part V]

8 Outubro 2024, 08:00 • André Maria da Silva Dias Moitinho de Almeida

Sources of noise
  • Readout noise
  • Dark current
  • Photonic ("shot noise")
  • Non-uniformity of pixels
  • Total noise

CCDs [Part IV]

3 Outubro 2024, 11:30 • André Maria da Silva Dias Moitinho de Almeida

Defects and non intended use
  • Saturation and load spillage ("blooming")
  • Defects: Cold / hot pixels and columns

Instrument signatures from CCD images
  • Bias /overscan
  • Dark current
  • Flat fields
  • Fringing


CCD image processing (Part I)

1 Outubro 2024, 09:00 • André Maria da Silva Dias Moitinho de Almeida

  • Tutorial on fits image file manipulation in python
  • Inspection of image metadata (content of headers)