Within the TRP program “Development of Low Dark Current MWIR/LWIR Detectors” ne MCT material was tested with reduced dark current for low photon flux applications. A specific ROIC design was set up within this program to allow a proper characterization of the material and act as a demonstrator for further ROIC derivates. Demonstrator assemblies were prepared and tested.
The poster will highlight the specific design approaches for the ROIC and the MCT. Four different topologies for the input stage on the ROIC were implemented to allow direct assessment of the impact of the design approach. A part of these input stages were designed using radiation hardened cell library. The ROIC doesn’t contain any internal state machine but id fully controlled via a high speed SPI interface driven by an external sequencer.
A test setup will be highlighted. A liquid helium cryostat was prepared to allow dark current measurements in an environment which does not suffer from parasitic radiation sources. The same setup is capable for operation with external illumination and optical filers, which can be moved into the beam.
The detector assemblies are presented. A two-step approach is shown which is initially scanning the performance of the different input topologies. A final detector assembly is selected upon the best performance; final assemblies are shown, the test results will be given on the poster.
AIM has developed IR modules including the FPAs for a wide range of applications. For SWIR applications FPAs based on liquid phase epitaxy (LPE) are available. These devices having different array sizes and are usable in a wide range of hyperspectral imaging applications. Silicon readout circuits provide various integration and readout modes including specific functions for spectral imaging applications.
An important advantage of MCT based detectors is the tunable band gap. The spectral sensitivity of MCT detectors can be engineered to cover the extended SWIR spectral region up to 2.5μm without compromising in performance.
AIM developed and released the technology option to extend the spectral sensitivity of its SWIR modules also into the VIS. This has been successfully demonstrated for different FPA designs. A short overview is given in tis paper.
AIM has qualified this VIS technology option based on a 1024x256 FPA capable for extended hyperspectral applications. Within this paper the test approach and the results will be presented.
In this paper we describe a cryogenic testbed designed to offer complete characterisation-via a minimal number of experimental configurations— of mercury cadmium telluride (MCT) detector arrays for low-photon background applications, including exoplanet science and solar system exploration. Specifically, the testbed offers a platform to measure the dark current of detector arrays at various temperatures, whilst also characterising their optical response in numerous spectral bands. The average modulation transfer function (MTF) can be found in both dimensions of the array along with the overall quantum efficiency. Working from a liquid-helium bath allows for measurement of arrays from 4.2 K and active-temperature control of the surface to which the array is mounted allows for characterisation of arrays at temperatures up to 80 K, with the temperature of the array holder known to an accuracy of at least 1 mK, with the same level of long-term stability.
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