Introduction to CCD camera

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1 Observational Astronomy 2011/2012 Introduction to CCD camera Charge Coupled Device (CCD) photo sensor coupled to shift register Jörg R. Hörandel Radboud University Nijmegen

2 1970: first articles on CCD W.S. Boyle, G.E. Smith, Bell Systems Technical Journal 49 (1970) 587 G.F. Amelio, M.F. Tompsett, G.E. Smith, Bell Systems Technical Journal 49 (1970) 593

3 1970: first articles on CCD Boyle & Smith

4

5 Semiconductor: doping Si doping: mix small amount of impurity to silicon crystal N-type: dope with phosphorus or arsenic 5th electron is free n conductor P-type: dope with boron or gallium one electron less -> hole p conductor 3 electrons 4 electrons 5 electrons

6 Photo(electric) effect liberation of electrons through incoming light energy per photon: E = hν band gaps

7

8 CCD working principle 1. photo effect: liberate electrons 2. collect charge - pixels (gates) Fig. 3. A MOS capacitor used as a light sensitive device. Fig. 1. The basic MOS structure MOS: metal oxide semiconductor

9 CCD working principle 3. read out: transfer charge apply differential voltage across gates Fig. 4. The sequence of collecting and moving the charge along a column of a CCD detector. The charge generated by photons is forced to move one step at a time through the application of voltage pulses on the electrodes.

10 CCD working principle 3. read out: transfer charge apply differential voltage across gates W.S. Boyle, G.E. Smith, Bell Systems Technical Journal 49 (1970) 587

11 CCD working principle 5. sequential read out column after column 6. detect charge - individual charge packets are converted to an output voltage in digitized form pixels are arranged on regular grid Fig. 2. The principle behind read-out of a CCD chip. One row at a time is shifted through an A/D converter which makes the output signal digital.

12 CCD working principle color images through RGB (red green blue) filter Fig. 5

13 Major sources of noise in CCD images Dark Current caused by thermally generated electrons -> temperature dependence Pixel Non-Uniformity each pixel has a slightly different sensitivity to light, typically within 1% to 2% of the average signal. -> flat-field image Shot Noise random arrival of photons. This is a fundamental trait of light. -> longer exposure or combining multiple frames CCD Read Noise (On-chip) There are several on-chip sources of noise that can affect a CCD. CCD manufacturers typically combine all of the on-chip noise sources and express this noise as a number of electrons RMS (e.g. 15eˉ RMS).

14 CCD Noise Sources and Signal-to-Noise Ratio B background photon flux

15 CCD Noise - Dark current

16 CCD Noise - Dependence on temperature

17 modern CCD 10 M pixel

18 Advantages of CCD Quantum efficiency (QE) ~ 80 % Low noise. High dynamic range(~50k). High photometric precision. Very linear behavior. Immediate digital conversion of data. Low voltages required (5V-15V) Geomatrically stable (Good for astronomy). Rapid clocking.

19 Example: CCD camera on Hubble Space Telescope Fig. 8. The galaxy cluster Abell Image: WFPC2, Hubble Space Telescope, NASA.

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