Research on the Limb Sensor for the FMG Image Stabilization System
Abstract
The Full-disk vector Magnetograph (FMG) is one of main payloads onboard the Advanced Space-based Solar Observatory (ASO-S). In order to measure the photospheric magnetic fields of the entire solar disk with high spatial resolution, FMG is equipped with an image-stabilization system with high accuracy. The limb sensor, one of the key components in the image-stabilization system, is used to detect the tip/tilt jitter. Based on the simulated data of the solar image on FMG, the measurement range and detection sensitivity of the limb sensor are theoretically analyzed and discussed while the size of the solar image varies. Finally, a suit of test system is set up in the lab to verify the performance of the limb sensor of the FMG image stabilization system. The experimental results are in good agreement with the theoretical analyses. The larger the size of the solar image, the greater the measurement range of the limb sensor, and the smaller the detection sensitivity of the limb sensor.
- Publication:
-
Acta Astronomica Sinica
- Pub Date:
- July 2020
- Bibcode:
- 2020AcASn..61...34Z
- Keywords:
-
- Advanced Space-based Solar Observatory (ASO-S);
- Full-disk vector Magnetograph (FMG);
- limb sensor