Blinking the fringes: initial development and results of the Ultra-Low Speed Optical Chopper for the Self-Coherent Camera
Blinking the fringes: initial development and results of the Ultra-Low Speed Optical Chopper for the Self-Coherent Camera
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闪烁边缘：自相干相机超低速光学斩波器的初步开发和结果
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发表时间：
2022
期刊：
影响因子：
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通讯作者：
C. Bradley
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作者：
Adam B. Johnson;C. Marois;D. Gamroth;J. Fitzsimmons;O. Lardière;W. Thompson;Garima Singh;C. Bradley
光学斩波是为高对比度仪器（如我们的SPIDERS探路者、CAL 2.0 Gemini Planet Imager 2.0升级版和其他未来项目）获取校准图像的一个步骤。一个独特的设计，平滑，连续，和缓慢的操作需要闪烁的流苏和无流苏的图像，昏暗和明亮的星星。超低速光学斩波器（ULSOC）必须在0.05 Hz和100 Hz之间闪烁，无噪声运行，停止在“开”或“关”位置，并由外部触发器控制其定时。硅橡胶阻尼器用于确保其与系统中的其他部件隔离。自校准系统可以接受10-30个刀片之间的任何切碎轮，而无需重新配置软件，并且在每次通电时都会找到其原始位置。ULSOC串行通信以在操作期间根据需要启动和停止。在至少10年的使用寿命中，长时间的运行（在天空观测期间），闭环步进伺服控制和来自斩波器轮的光学反馈确保了准确和可重复的速度和位置。初步原型表明，平稳和无噪音的操作是可能的所需的速度范围内，振动是良好的管理。今年的进一步发展将使一个功能齐全的设备在天空中与我们的SPIDERS仪器进行测试，并为未来项目的修订铺平道路。
Optical chopping is a step taken to acquire calibrated images for high-contrast instruments such as our SPIDERS pathfinder, the CAL2.0 Gemini Planet Imager 2.0 upgrade, and other future projects. A unique design with smooth, continuous, and slow operation is needed to blink the fringed and unfringed images for dim and bright stars. The Ultra-Low Speed Optical Chopper (ULSOC) must blink between 0.05Hz and 100Hz with noise-free operation, stop in the ‘on’ or ‘off’ position, and have its timing controlled by an external trigger. Silicone dampers are utilized to ensure it is vibration-isolated from other components in the system. The self-calibrating system accepts any chopping wheel between 10-30 blades without the need to reconfigure software and will find its home position on every power-up. The ULSOC communicates serially to start and stop as needed during operation. Long operational periods (during on-sky observations) over a lifetime of at least 10 years, closed-loop stepper-servo control and optical feedback from the chopper wheel guarantees accurate and repeatable velocity and position. Initial prototypes show that smooth and noise-free operation are possible for the desired speed ranges, and vibration is well-managed. Further development this year will lead to a fully functional device to be tested on-sky with our SPIDERS instrument and lead the way to revisions down the road for future projects.