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Título del libro:
Título del capítulo: The Performance of the Mosaic CMOS Wide Field Camera for Transneptunian Automatic Occultation Survey (TAOS II)

Autores UNAM:
JOEL HUMBERTO CASTRO CHACON; MAURICIO REYES RUIZ;

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Autores externos:

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Idioma:

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Año de publicación:
2024

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Palabras clave:

Camera; CMOS sensor; high speed; mosaic; photometry

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Resumen:

The Transneptunian Automated Occultation Survey (TAOS II) is a three robotic telescope project to detect stellar occultation events generated by TNOs. TAOS II aims to monitor about 10000 stars simultaneously at 20Hz to generate a significant event rate. The TAOS II cameras are designed to cover the 1.7 degree diameter field of view of the 1.3m telescopes with a mosaic of ten 4.5k × 2k e2v CIS 113 CMOS sensors. The CIS 113 has a back-illuminated thinned structure to provide similar performance to that of back-thinned CCDs. The CIS 113 device has 16 micron pixels with 8 outputs, with a plate scale about 0.63?/pixel. With the freedom of direct row and column addressing, star boxes with sizes of 8 × 8 pixels in each sensor can be sampled at 20 Hz or higher with a pixel rate of 1M pixel/sec per channel. The sensors, mounted on a single Invar plate, are cooled to an operating temperature of about 200K by a cryogenic cooler. The gap between two sensors is about 0.5mm. The control electronics consist of an analog part and a Xilinx FPGA based digital circuit. One FPGA is needed to control and process the signal from each CIS 113 chip. Two large PCBs were used to fanout signals from the 10 CMOS devices through the vacuum chamber wall. A synchronization circuit receives a pulse from the control building to ensure the timing error of exposures of the three cameras is within 1 ms. The cameras were delivered and installed on the TAOS telescopes in 2023 and series of tests and adjustments have been carried out to optimize the performance. In this presentation, the camera performance in the full frame mode and the window mode will be detailed. The synchronization and the adjustment among the three cameras will also be presented. © 2024 SPIE.

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Entidades citadas de la UNAM:

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Fuente:



ISBN:
9781510675155
Editorial:
SPIE

Tipo de producto:
Conference Paper

DOI:
10.1117/12.3018461