A two-dimensional intensified photodiode array for imaging spectroscopy

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astronomical Spectroscopy, Counting Circuits, Microchannel Plates, Photodiodes, Photons, Spatial Resolution, Central Processing Units, Computer Systems Programs, Hardware, Space Shuttle Payloads, Supernova Remnants

Scientific paper

The Johns Hopkins University is currently developing an instrument to fly aboard NASA's Space Shuttle as a Spartan payload in the late 1980s. This Spartan free flyer will obtain spatially resolved spectra of faint extended emission line objects in the wavelength range 750-1150 A at about 2-A resolution. The use of two-dimensional photon counting detectors will give simultaneous coverage of the 400 A spectral range and the 9 arc-minute spatial resolution along the spectrometer slit. The progress towards the flight detector is reported here with preliminary results from a laboratory breadboard detector, and a comparison with the one-dimensional detector developed for the Hopkins Ultraviolet Telescope. A hardware digital centroiding algorithm has been successfully implemented. The system is ultimately capable of 15-micron resolution in two dimensions at the image plane and can handle continuous counting rates of up to 8000 counts/s.

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