WFC3 TV3 Testing: IR Channel Blue Leaks

Details WFC3 TV3 Testing: IR Channel Blue Leaks WFC3 TV3 Testing: IR Channel Blue Leaks

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008wfc..rept....5b&link_type=abstract

Instrument Science Report WFC3 2008-05, 3 pages

Computer Science

Hubble Space Telescope, Hst, Space Telescope Science Institute, Wide Field Camera 3, Wfc3, Therman Vacuum Testing, Ir Channel, Blue Leaks

Scientific paper

A new IR detector (IR4; FPA165) is housed in WFC3 during the current campaign of thermal vacuum (TV) ground testing at GSFC. As part of these tests, we measured the IR channel throughput. Compared to the previous IR detectors, IR4 has much higher quantum efficiency at all wavelengths, particularly in the optical. The total throughput for the IR channel is still low in the optical, due to the opacity of the IR filters at these wavelengths, but there is a small wavelength region (~710-830 nm) where these filters do not offer as much blocking as needed to meet Contract End Item specifications. For this reason, the throughput measurements were extended into the blue to quantify the amount of blue leak in the narrow and medium IR bandpasses where a few percent of the measured flux could come from optical photons when observing hot sources. The results are tabulated here.

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