氣暉影像儀規劃選擇樹莓派相機模組(Pi NoIR Camera Board)，因其具有成本低、體積小、重量輕及耗能低的優勢，並進行光學實驗驗證，包含空間解析度、觀測視野以及響應程度三項測試。根據光學實驗結果，觀測762nm與630nm波段氣暉，曝光時間設定分別約為150 ms 與1s。透過實驗評估觀測酬載設計之可行性，在不考慮太空中輻射的影響的情況下，我們建議未來立方衛星可使用樹莓派相機模組作為太空中的氣暉影像儀。 ;The airglow is a luminous phenomenon in the upper atmosphere. The 762nm and 630nm airglow emissions are selected to be designed for the optical payload of CubeSate. First, we simulate the 762nm and 630nm airglow by using the density of charged particles from IRI-2007 and neutral particles from MSISE model in spring of 2010. We can calculate the volume emission rates of 762nm and 630nm emissions, which are estimated for global distribution of airglow brightness in nadir-view and for the satellite measurement of the airglow brightness in limb-view. The calculated brightness of airglow emissions from nadir and limb-view can be used to testify the performance of imager sensor onboard CubeSate.
We select the Pi NoIR camera module (Raspberry Pi board) as the imager sensor because of its advantages of low-cost, compact, light-weight and low-power. We testified the performance of spatial resolution, field of view and the responsivity of the camera module. Based on our results of optical experiments, we estimate the imager exposure time of 762nm and 630nm emissions is required at least 150 ms and 1s, respectively. We suggest that the Raspberry Pi camera module can be used to observe airglow in space without considering radiance damage.
