POET is a proposed Canadian Microsatellite mission to detect new, potentially habitable, rocky planets transiting low-mass stars, and to characterize the atmospheres of known transitioning extrasolar planets. The allreflective telescope offers simultaneous imaging in the u-band (300-400 nm), VNIR (400-900 nm) and SWIR (900-1700 nm) through a 20 cm aperture. The optical telescope assembly (OTA) has been designed and build with support from the Space Technology Development Program (STDP) of the Canadian Space Agency. The prototype underwent complete integration and optical properties testing including ensquared energy, Modulation Transfer Function, distortion, and Effective Focal Length measurement. Results show that the design is compliant with expected performances at ambient temperature. A Thermal-Vacuum Chamber campaign over the range of operation temperature has been designed to verify the OTA’s performance from -20 °C to 20°C. This enables the investigation of image quality stability in a sub-set of environmental conditions, increasing the OTA’s Technology Readiness Level. POET is a collaboration between Bishop’s University, Western University, ABB and SFL-UTIAS.
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