Pupil-plane imager for scintillometry over long horizontal paths.

Area of Science:

• Optical astronomy
• Atmospheric physics
• Adaptive optics

Background:

• Atmospheric turbulence distorts light, affecting astronomical observations and adaptive optics (AO) performance.
• Measuring scintillation strength is crucial for understanding and mitigating these effects.

Purpose of the Study:

• To design and implement a pupil plane imaging (PPI) system for measuring atmospheric scintillation.
• To estimate key parameters of atmospheric turbulence using the PPI system.
• To assess adaptive optics performance based on measured scintillation.

Main Methods:

• A high-speed, high-resolution camera captures images of a telescope's pupil.
• The system estimates normalized intensity variance to quantify scintillation.
• Data collected over near-horizontal paths (approx. 50 km) were analyzed.

Main Results:

• The PPI system successfully measured scintillation induced by atmospheric turbulence.
• Strong scintillation effects were frequently observed in experimental data.
• Results were compared with parallel instrument data, with error analysis provided.

Conclusions:

• The pupil plane imaging system is effective for estimating scintillation strength.
• Accurate scintillation measurement using PPI aids in evaluating adaptive optics system performance.
• This method provides valuable data for astronomical observations through turbulent atmospheres.