Ultra Start KE-6 Specifications download pdf (Page 98)

Version 1.1 rev Jan 2013

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iXon Ultra

Appendix

A.1 - GLOSSARY

This glossary provides an overview of the concepts and terminology used in Andor’s EMCCD technology.

A.1.1 - Readout sequence of an EMCCD

In the course of readout, charge is moved vertically into the shift register then horizontally from the shift register into the

output node of the amplier. The simple readout sequence illustrated below (which corresponds to the default setting of

the Full Resolution Image binning pattern) allows data to be recorded for each individual element on the EMCCD-chip.

Other binning patterns are achieved by summing charge in the shift register and/or the output node prior to readout. For

further information on binning, please refer to Section 3.3.6 on page 55).

Figure 44: Readout sequence of an EMCCD

1. Exposure to light causes a pattern of charge (an electronic image) to build up on the frame (or Image Area) of the

EMCCD-chip

2. Charge in the frame is shifted vertically by one row, so that the bottom row of charge moves into the shift register.

3. Charge in the shift register is moved horizontally by one pixel, so that charge on the endmost pixel of the shift

4. Charge is shifted into the output node of the amplier.

5. The charge in the output node of the amplier is passed to the analog-to-digital converter and is read out.

6. Steps 3 and 4 are repeated until the shift register is emptied of charge.

7. The frame is shifted vertically again, so that the next row of charge moves down into the shift register.

The process is repeated from Step 3 until the whole frame is read out.

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Ultra Start KE-6 Specifications Page 98