A new imaging technique is introduced, based on tomographic imaging principles applied to the output from a conical scan reticle system. The concept allows for a simple, low cost system consisting of simple scanning optics, a single element detector and a signal-processing unit to act as an imaging sensor. Potential applications of the tomographic scanning imaging (TOSCA) seeker include missile seekers, smart munitions, and other devices using low-cost imagers.

Tomographic scanning imaging seeker

We present the design of an infrared (IR) photon counting array consisting of an array of mid IR HgCdTe APDs read out with a CMOS application specific integrated circuit (ASIC) developed for x-ray imaging called the Medipix2. The Medipix2 is an array of 256x256 pixels, each of which amplifies and counts pulse events. When combined with an APD whose gain is high enough, the Medipix2 will integrate these detected photons, and the binary readout of these counters will be fast (~ 1kHz framerate) and noiseless. Initial feasibility tests of this concept using individual APDs from DRS technologies Inc. wirebonded to Medipix input pads are discussed.

Mid-IR photon counting array using HgCdTe APDs and the Medipix2 ROIC

The near infrared spectrograph (NIRSpec) will be the James Webb Space Telescope's (JWSTs) primary near-infrared spectrograph. NIRSpec is a multi-object spectrograph with fixed-slit and integral field modes. EADS/Astrium is building NIRSpec for the European Space Agency (ESA), with NASA providing the detector subsystem and programmable multi-aperture mask. In this presentation we present an overview of the detector subsystem (DS).

Large format HgCdTe arrays for the James Webb Space Telescope

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Large format HgCdTe arrays for the James Webb Space Telescope