Specifications

Table Of Contents
Version 1.1 rev Jan 2013
Page 90
iXon Ultra
Hardware
4.3 - VACUUM HOUSING
Unless protected, cooled CCD sensors will condense moisture, hydrocarbons and other gas contaminants that
will attack the CCD surface. If that happens, CCD performance will decline proportionally and will eventually fail.
Fortunately, the integrity of the sensor can be preserved by housing it in a protective enclosure. However, it is important
to understand that all such environments are not the same and the underlying technology used can seriously impact
camera life (and performance).
A permanent hermetic vacuum head is an essential component of high-end imaging and spectroscopy EMCCD
cameras. A permanent vacuum requires not only a hermetic seal, but also low outgassing. These criteria are what
Andor’s UltraVac
TM
vacuum process uniquely ensures. It is the low outgassing (see Section 4.5 on page 93) that is the
real challenge and, in reality, what sets the real limit on long-term performance. Andor has developed and utilized the
UltraVac
TM
process over more than 10 years, so it is proven with 1,000s of systems in the eld and a measured Mean-
Time-Between-Failure (MTBF) of 100 years; that means it will take 100 years for half of them to fail.
Furthermore, Andor’s rigorous, proprietary vacuum process is carried out in a Class 1,000 clean room; this
means less than 1,000 particles of less than 0.5 micron dimension per cubic meter. The air is fully replenished
every minute. We welcome visitors to inspect our state-of-the-art facility.
Benets of UltraVac
TM
• Sustained vacuum performance over many years operation – proprietary process to minimize outgassing
• Benet from a thoroughly proven solution - UltraVac
TM
. 10 years of shipping vacuum systems to the eld and a
negligible failure rate (an MTBF of 100 years)
• Performance improves because the temperature of the chip can be reduced signicantly. Better cooling (down
to -100°C with an enhanced thermoelectric Peltier design) translates into substantially lower darkcurrent and
fewer blemishes
• Such darkcurrent performance is particularly critical to EMCCD technology, where even a single thermal
electron is detected as a spurious noise spike
• Elimination of condensation and outgassing means that the system can also use only a single entrance window,
with antireection coating – you can believe the QE curve
• The permanent hermetic vacuum ensures that peak quantum efciency and cooling will not degrade, even after
years of operation