EUV Astronomical Spectroscopy With CCD Detectors

R. A. Stern; R. C. Catura; M. M. Blouke; M. Winzenread

doi:10.1117/12.968135

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13 October 1986 EUV Astronomical Spectroscopy With CCD Detectors

R. A. Stern, R. C. Catura, M. M. Blouke, M. Winzenread

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Proceedings Volume 0627, Instrumentation in Astronomy VI; (1986) https://doi.org/10.1117/12.968135
Event: 1986 Astronomy Conferences, 1986, Tucson, United States

Abstract

We discuss the applicability of CCD detectors to astronomical extreme ultraviolet (EUV) spectroscopy ( 100 - 1250 Å). The advantages of CCDs in this spectral region include internal electron yield (~ 3-30 e-/per detected photon), the potential for very high quantum efficiency (~ 50-90 percent ), and broad wavelength response. Visible light suppression is achieved by a combination of low grating scattering, great er than unity electron yield in the EUV, and various filter techniques. For the current generation of (Cl),s detection of only a few EUV photons will rapidly overwhelm the read noise ( < 5-10 e- RMS). Thus for all practical S/N ratios used in ast-ronomical spectroscopy, read noise will be negligible compared to the poisson statistics of the detected photons. We will discuss a model based upon experimental data for the quantum efficiency and electron yield of CCDs in the EUV, outline charge trapping and transport considerations, and describe a program to obtain CCDs with stable EUV/UV quantum efficiency for windowless spaceflight operation.

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R. A. Stern, R. C. Catura, M. M. Blouke, and M. Winzenread "EUV Astronomical Spectroscopy With CCD Detectors", Proc. SPIE 0627, Instrumentation in Astronomy VI, (13 October 1986); https://doi.org/10.1117/12.968135

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