CFHT Interference Filter Database Code Explanation for IR Filters
HTML version created by Greg Barrick
Maintained by Greg Barrick
Last updated: 29 December 2004
Send comments to barrick@cfht.hawaii.edu.
A numbering system has been adopted to organize the filter database. The
filters are numbered based on a 4 digit code.The following diagram explains
the coding system for the IR filters. The system for the visible filters is
similar, and is explained on the
visible code page.
ex.: 5 3 04
| | |
| | ------- order sequence # (4th filter with 15 as prefix)
| |
| ---------- Wavelength band filter falls within:
| 0 : <1 micron
| 1 : 1 - 1.5 microns
| 2 : 1.5 - 2 microns
| 3 : 2 - 2.5 microns
| 4 : 2.5 - 3 microns
| 5 : 3 - 3.5 microns
| 6 : 3.5 - 4 microns
| 7 : 4 - 4.5 microns
| 8 : 4.5 - 5 microns
| 9 : >5 microns
|
------------- size and/or instrument to be used with:
5 : 25.4 mm round (Redeye, FTS)
6 : 12.7 mm round (KIR)
8 : 110 mm round (Wircam)
The 25.4 mm round filter list also includes some of the FTS 1/2 filters
which are semi-circles and not round.
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