Measured QE performance of HAWAII arrays

[Craig D Mackay]

Posted to CCD-world:
-+-+-+-
Dear Chris

There is a QE curve for the HAWAII arrays on:

http://www.rsc.rockwell.com/websearch/mct_fpa/Hawaii/histo_qe.html

We have had five of these arrays in Cambridge for the CIRSI camera
system (http://www.ast.cam.ac.uk/~optics/cirsi/).   We have measured
standard stars in different colours, and find that the relative quantum
efficiencies are all rather similar, implying (to the 10 percent level)
that the QE curve slopes are similar.   Chip-to-chip differences could
be due to QE differences or to gain differences, but again we find the
chips are all within +/- 10 percent, and these differences could reflect
partially sky transparency variations.

We do not have calibrated test gear here so cannot give lab results of
any real meaning in this respect.   We have accepted these devices as
God-given, and found that they work on telescopes much as you would
expect from the Rockwell measurements, which we generally find to be a
good guide to the performance we actually see.

Best Wishes

Craig D Mackay
Institute of Astronomy
University of Cambridge.
-+-+-+-
For information about CCD-world, send email to owner-CCD-world at cfht.hawaii.edu.