Sumários

Telescopes, instruments and astronomical observatories (part II)

20 Outubro 2022, 08:00 • André Maria da Silva Dias Moitinho de Almeida

- Compensate for the effect of turbulence: Adaptive optics 
- Reflecting telescopes and variations on their design. Spotlights.

CCD image processing (Part III)

18 Outubro 2022, 09:00 • André Maria da Silva Dias Moitinho de Almeida

:: Image processing:
- Combination of flat field images for each band.
- Examination of the combined images.
- Identification and fixing of artifacts in the combined flats.
- Application of flat-field corrections.
- Examination of the final images.

Telescopes, instruments and astronomical observatories (or instruments and technologies for astronomical observation)

18 Outubro 2022, 08:00 • André Maria da Silva Dias Moitinho de Almeida

- What does a telescope do?
- Collecting area and its effect on light concentration and resolution. Diffraction limit concept.
- Refracting telescopes
- Effects of the atmosphere in the acquisition of spatial images: Turbulence; absorption; reddening

Further reading: Chap 2 and 3 of McLean (Electronic Imaging in Astronomy)

CMOS detector arrays

13 Outubro 2022, 08:00 • André Maria da Silva Dias Moitinho de Almeida

- CMOS detector definition
- CMOS detector principles of operation
- Performance of modern CMOS detectors
- Examples of CMOS detectors

CCD image processing (Part II)

11 Outubro 2022, 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).

- Combinations of 100 bias images. Analysis of the combined super master bias

:: Image processing:
- Application of Zero correction (bias) to images with an exposure time greater than 0.