TWINS2, Lyman-alpha Detector, LAD

TWINS2, Lyman-alpha Detector, LAD, The TWINS Lyman-alpha detector consists of two independent sensors to measure Lyman-alpha radiation being emitted by neutral hydrogen atoms. The sensors are oriented at angles of ±40° with respect to the actuator spin axis. Each sensor has a full width, half maximum, FWHM, field of view of 4° defined by collimation hole baffles, uses Lyman-a interference filters as narrow band transmissions filters, and applies a KBr or CsI photodiode for photon detection. The Lyman-alpha detector is located on the rotating actuator platform in order to provide a full 360° azimuthal angle coverage. It has a time resolution of 60 s.TWINS2，莱曼-α探测器（Lyman-alpha Detector，简称LAD），由两个独立的传感器组成，旨在测量由中性氢原子发射的莱曼-α辐射。这两个传感器相对于执行器旋转轴线以±40°的角度取向。每个传感器具备由准直孔遮光板定义的4°全宽半最大值（Full Width at Half Maximum，简称FWHM）视场，采用莱曼-α干涉滤光片作为窄带传输滤光器，并利用溴化钾（KBr）或碘化铯（CsI）光电二极管进行光子探测。莱曼-α探测器位于旋转执行器平台上，旨在提供全方位的360°方位角覆盖。该探测器的时分辨率为60秒。