We designed a flight model of the wide field X-ray imager on board the microsat KOYOH, referred to as T-LEX, and investigated its imaging performance through laboratory beam tests. T-LEX employs the coded mask method, wherein the aperture pattern of the mask was selected and fabricated from 50,000 patterns using a Monte Carlo approach. Utilizing the obtained mask along with a silicon strip detector, we examined the angular response by varying the incident angle with a stage during X-ray irradiation. The resulting angular response exhibited deviations from the design values, yet it confirmed that the targeted position accuracy of 15 arcminutes is maintained across a range from -20deg to +20deg with the best fit calibrated model.

中文翻译：

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KOYOH小卫星广视场X射线瞬态定位实验成像性能

我们设计了微型卫星上的广域X射线成像仪的飞行模型 光洋，简称T-LEX，并通过实验室光束测试研究了其成像性能。 T-LEX采用编码掩模方法，其中使用蒙特卡罗方法从50,000个图案中选择和制造掩模的孔径图案。利用获得的掩模和硅条检测器，我们通过在 X 射线照射期间改变载物台的入射角来检查角度响应。由此产生的角度响应与设计值存在偏差，但证实了通过最佳拟合校准模型，在 -20 度到 +20 度的范围内保持了 15 弧分的目标位置精度。