Scintillation Generator for Aero-Optical Turbulence Simulation
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Solution Overview
Problem
Current adaptive optics systems face limitations in fully correcting for aerodynamic and free-stream turbulence, leading to data fades and dropouts in high-speed laser communication systems, and require costly and uncontrollable open-air testing for system development.
Innovation Solution
A two-deformable mirror system is used to simulate realistic aerodynamic and atmospheric turbulence within a laboratory environment, allowing for precise and repeatable simulation of wave-front phase errors and amplitude fluctuations by positioning a second deformable mirror in the Fourier plane of the first, enabling accurate simulation of beam propagation through both near-field and far-field turbulence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If open-air testing is used for system development, then system performance can be tested under real atmospheric conditions, but testing becomes costly and uncontrollable
Solution Approach 1:
The patent creates a laboratory-based turbulence simulation system that copies real atmospheric turbulence conditions using deformable mirrors and phase modulation. Instead of conducting expensive and uncontrollable open-air tests, the system generates synthetic turbulence that replicates atmospheric effects, allowing repeated, controlled experimentation with laser communication systems under realistic but manageable conditions.
2Reliability
If adaptive optics systems are used to correct turbulence, then wave-front distortions can be reduced, but closed-loop bandwidth and spatial resolution limitations prevent full correction
Solution Approach 1:
Instead of using adaptive optics to correct turbulence effects on received signals, the patent inverts the approach by using deformable mirrors to generate controlled turbulence in the transmitted beam. The first deformable mirror applies phase modulation to simulate atmospheric turbulence, and the second deformable mirror in the Fourier plane corrects or modifies the turbulence effects, allowing researchers to study and optimize correction algorithms under controlled conditions.
3Productivity
If laser communication systems operate at ultra-high data rates, then data transmission capacity increases, but systems become more susceptible to turbulence-induced data fades and dropouts
Solution Approach 1:
The patent introduces turbulence simulation as an intermediary element between the laser communication system and the atmosphere. By using deformable mirrors to generate controlled turbulence that mimics atmospheric effects, the system can evaluate how ultra-high data rate transmissions perform under various turbulence conditions, allowing optimization of modulation schemes, coding, and compensation algorithms before deployment in real atmospheric conditions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for reliable, calibrated, and validated optical simulation of turbulence, eliminating the need for long-range testing and reducing costs by providing a controlled environment for testing laser and electro-optical systems, with the ability to simulate any desired level of turbulence and wavelength, thus improving system performance and efficiency.
Implementation Method 1
movement (actuation) of a first deformable mirror is controlled to modulate a reflected laser beam to induce wave-front phase error (aberrations) onto a reflected laser beam to simulate propagation of the reflected laser beam through near-field aero-optical disturbance
Implementation Method 2
movement (actuation) of the second deformable mirror is controlled to modulate a reflection of the near-field laser beam to induce amplitude fluctuations onto the reflected near-field laser beam to simulate propagation of the reflected near-field laser beam through far-field atmospheric turbulence
Implementation Method 3
the reflected laser beam is focused onto a second deformable mirror to form a near-field beam
Data Source
AI summary
In one aspect, a scintillation generator for simulation of aero-optical and atmospheric turbulence is described. A first deformable mirror is illuminated using collimated light from a source laser beam. In one aspect, movement of a first deformable mirror is controlled to modulate a reflected laser beam to induce wave-front phase errors onto the reflected laser beam to simulate propagation of the reflected laser beam through near-field aero-optical disturbance. In one aspect, the reflected laser beam is focused onto a second deformable mirror to form a near-field beam. In one aspect, movement of the second deformable mirror is controlled to modulate a reflection of the near-field laser beam to induce amplitude fluctuations onto the reflected near-field laser beam to simulate propagation of the reflected near-field laser beam through far-field atmospheric turbulence. The second deformable mirror is in a Fourier plane of the first deformable mirror. Other aspects are described and claimed.