Poster Presentation

TAOSII project and the characteristic of CMOS Image Sensor CIS107

Chung-Kai Huang(National Central University/ASIAA) Shiang-Yu Wang(ASIAA)

TAOSII (Transneptunian Automated Occultation Survey) aims to measure the small size objects located in and beyond the Kuiper Belt. Because the size is small(~1 km) and the distance is far(>40 AU), it is impossible to detect these objects directly with existing telescopes. Fortunately, when these objects pass in front of bright stars, they block the star light—called occultation. The time period of this kind of event is short(~0.2 s) and event rate is low. In other words, we need a new technology to make high speed photometry but low readout noise. The key device of this project is the detector sensor. Here, we present the testing report for this CMOS sensor—CIS107—which has low readout noise(~5e) and allow programable readout for small area made by e2v company. This sensor contains 1500 × 2000 × 7μm pixels and the QE reaches higher than 90%. At lower temperature testing, the performance of CIS107 shows the lower dark current and readout noise. The similar design is developed for large format array that TAOSII will use.