reading from a charge coupled device (ccd) © d hoult 2010 odws

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Reading from a charge coupled device (ccd) © D Hoult 2010 ODWS

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Page 1: Reading from a charge coupled device (ccd) © D Hoult 2010 ODWS

Reading from a charge coupled device (ccd)

© D Hoult 2010 ODWS

Page 2: Reading from a charge coupled device (ccd) © D Hoult 2010 ODWS

Each pixel in a ccd consists of a photoelectric cell and a capacitor (to store the charge emitted)

© D Hoult 2010 ODWS

Page 3: Reading from a charge coupled device (ccd) © D Hoult 2010 ODWS

Each pixel in a ccd consists of a photoelectric cell and a capacitor (to store the charge emitted)

The voltage across the capacitor is proportional to the charge stored

© D Hoult 2010 ODWS

Page 4: Reading from a charge coupled device (ccd) © D Hoult 2010 ODWS

Each pixel in a ccd consists of a photoelectric cell and a capacitor (to store the charge emitted)

The voltage across the capacitor is proportional to the charge stored and hence to the intensity of the illumination of the pixel

© D Hoult 2010 ODWS

Page 5: Reading from a charge coupled device (ccd) © D Hoult 2010 ODWS

The pixels in this diagram have been magnified...

© D Hoult 2010 ODWS

Page 6: Reading from a charge coupled device (ccd) © D Hoult 2010 ODWS

The pixels in this diagram have been magnified...

quite a lot !

© D Hoult 2010 ODWS

Page 7: Reading from a charge coupled device (ccd) © D Hoult 2010 ODWS

This ccd has not yet been exposed to light© D Hoult 2010 ODWS

Page 8: Reading from a charge coupled device (ccd) © D Hoult 2010 ODWS

After exposure, the capacitors in the illuminated pixels now store a small charge © D Hoult 2010 ODWS

Page 9: Reading from a charge coupled device (ccd) © D Hoult 2010 ODWS

The data are read 1 pixel at a time© D Hoult 2010 ODWS

Page 10: Reading from a charge coupled device (ccd) © D Hoult 2010 ODWS

First, all the voltages are “shifted” towards a special row of pixels at one end of the chip

© D Hoult 2010 ODWS

Page 11: Reading from a charge coupled device (ccd) © D Hoult 2010 ODWS

First, all the voltages are “shifted” towards a special row of pixels at one end of the chip

© D Hoult 2010 ODWS

Page 12: Reading from a charge coupled device (ccd) © D Hoult 2010 ODWS

First, all the voltages are “shifted” towards a special row of pixels at one end of the chip

© D Hoult 2010 ODWS

Page 13: Reading from a charge coupled device (ccd) © D Hoult 2010 ODWS

Now the data voltages are “shifted”, one at a time, towards a pixel at the end of that special row

© D Hoult 2010 ODWS

Page 14: Reading from a charge coupled device (ccd) © D Hoult 2010 ODWS

After each shift, the voltage in the special pixel is read and stored in memory © D Hoult 2010 ODWS

Page 15: Reading from a charge coupled device (ccd) © D Hoult 2010 ODWS

After each shift, the voltage in the special pixel is read and stored in memory, in this case, zero

© D Hoult 2010 ODWS

Page 16: Reading from a charge coupled device (ccd) © D Hoult 2010 ODWS

voltage = V

© D Hoult 2010 ODWS

Page 17: Reading from a charge coupled device (ccd) © D Hoult 2010 ODWS

voltage = 0

© D Hoult 2010 ODWS

Page 18: Reading from a charge coupled device (ccd) © D Hoult 2010 ODWS

voltage = 0

© D Hoult 2010 ODWS

Page 19: Reading from a charge coupled device (ccd) © D Hoult 2010 ODWS

voltage = V

© D Hoult 2010 ODWS

Page 20: Reading from a charge coupled device (ccd) © D Hoult 2010 ODWS

voltage = 0

© D Hoult 2010 ODWS

Page 21: Reading from a charge coupled device (ccd) © D Hoult 2010 ODWS

voltage = V

© D Hoult 2010 ODWS

Page 22: Reading from a charge coupled device (ccd) © D Hoult 2010 ODWS

voltage = 0

© D Hoult 2010 ODWS

Page 23: Reading from a charge coupled device (ccd) © D Hoult 2010 ODWS

voltage = 0

© D Hoult 2010 ODWS

Page 24: Reading from a charge coupled device (ccd) © D Hoult 2010 ODWS

voltage = V

© D Hoult 2010 ODWS

Page 25: Reading from a charge coupled device (ccd) © D Hoult 2010 ODWS

voltage = V

© D Hoult 2010 ODWS

Page 26: Reading from a charge coupled device (ccd) © D Hoult 2010 ODWS

voltage = V

© D Hoult 2010 ODWS

Page 27: Reading from a charge coupled device (ccd) © D Hoult 2010 ODWS

voltage = V

© D Hoult 2010 ODWS

Page 28: Reading from a charge coupled device (ccd) © D Hoult 2010 ODWS

voltage = V

© D Hoult 2010 ODWS

Page 29: Reading from a charge coupled device (ccd) © D Hoult 2010 ODWS

voltage = 0

© D Hoult 2010 ODWS

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