Research on Micro-Vibration Analysis of Segmented Telescope Based on Opto-Mechanical Integration

Area of Science:

• Optics and Space Engineering
• Mechanical Engineering
• Vibration Analysis

Background:

• In-orbit micro-vibrations significantly impact the imaging quality of segmented telescopes.
• Complex interactions between optical and mechanical systems under vibration are challenging to model.

Purpose of the Study:

• To propose a dynamic full-link opto-mechanical integration analysis method.
• To quantify the effect of micro-vibration on imaging quality for segmented telescopes with long exposure times.

Main Methods:

• Utilized measured micro-vibration signals from an infrared refrigerator.
• Performed transient response analysis using the finite element method in Patran/Nastran.
• Developed a Matlab interface for rigid body displacement calculation and real-time data interaction with Zemax.

Main Results:

• Achieved a wavefront error Root-Mean-Square (RMS) value below 0.071λ at a 1 μm wavelength over 4 seconds.
• Evaluated imaging quality using the point spread function peak ratio.
• Observed maximum peak ratio values of 0.4628 (X-axis) and 0.6207 (Y-axis) with a 2-second exposure time.

Conclusions:

• The developed method effectively analyzes the impact of micro-vibrations on segmented telescope imaging quality.
• Provides a crucial reference for evaluating optical system performance in micro-vibration environments, especially for long exposures.