TV Monitoring of the F8 Detector Red Sensitivity
(Test Segment YMONTHLY)

George Hartig
SPA CE TELESCOPE SCIENCE INSTITUTE

Instrument Science Report CAL/FOS—036
August 1986



Abstract


Spectra obta.ined with the G780H gra.ting and the internal
cross-strapped calibra.tion lamp indicate tliat the red sensitivity of
tbe F8 detector is not stable and may be dependent on its temperature
history. Compaxison of pre-TV spectra with similar data obtained in
December 1985 show a wavelength dependent drop of 40% at 7400k and <
10% at 6300k, but spectra obtained after the detector ha.d been
operated for some time in the relatively cold ( 5 C) TV environment
indicate a return of the red response to a.bout the December 1985
values. An additional measurement in August 1986, after the FOS sat in
ainbient conditions for about 7 weeks following TV, shows a recurrence
of the red response degradation.