Telescope Auto-Focusing via Full-Frame Guider Analysis
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Solution Overview
Problem
Current auto-guiding and auto-focusing techniques in astronomy rely on guide stars, which can lead to seeing errors and require complex mechanics, limiting tracking accuracy and increasing exposure times due to the need for iterative focus adjustments and separate guide star selection.
Innovation Solution
Processing the entire field of view of a guider frame to retrieve image registration and focus information from any astronomical feature, eliminating the need for guide stars and centroid techniques, and using this information for real-time auto-guiding and auto-focusing corrections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If guide star centroid techniques are used for auto-guiding, then tracking corrections can be obtained, but seeing-induced errors increase and tracking accuracy decreases
Solution Approach 1:
The patent combines multiple reference points (stars, galaxies, nebulae) within the entire guider field of view into a unified reference framework, replacing the single guide star approach. This merging of multiple references averages out seeing-induced errors and provides more robust tracking corrections.
Solution Approach 2:
The system makes the guider capable of using any astronomical feature (stars, galaxies, nebulae) as reference, not limited to single guide stars. This universal approach allows flexible selection of reference objects and improves performance by utilizing all available features in the field of view.
2Manufacturing precision
If iterative focus adjustments are performed to achieve best focus, then image quality improves, but exposure time increases and productivity decreases
Solution Approach 1:
The patent performs focus determination using the guider frame before or during the main imaging exposure, rather than requiring iterative adjustments during the exposure. This preliminary action allows the focuser to be positioned accurately in advance, eliminating time-wasting iterative adjustments during critical imaging periods.
Solution Approach 2:
The guider frame serves as an intermediary tool for focus determination, providing real-time feedback about focus quality without requiring interruption of the main imaging process. This mediator enables continuous monitoring and adjustment.
3Extent of automation
If guide star selection and processing is performed, then auto-guiding corrections can be computed, but system complexity increases and operation becomes more difficult
Solution Approach 1:
The system automatically detects and utilizes any astronomical features in the guider field of view without requiring user intervention for guide star selection. The software autonomously identifies suitable reference objects and processes them for generating tracking corrections, making the system self-sufficient.
Solution Approach 2:
The patent extracts the guide star selection step from the process, eliminating the need for users to manually search and select guide stars. The system automatically extracts and utilizes available astronomical features, simplifying the user interface and operation.
4Measurement precision
If a single guide star is used for reference, then processing is simpler, but signal-to-noise ratio decreases and measurement precision is reduced
Solution Approach 1:
The patent merges information from multiple astronomical features (multiple stars, galaxies, nebulae) within the guider field of view into a unified reference framework. This combination increases the total reference information available and improves the signal-to-noise ratio through averaging.
Data Source
AI summary
A method of correcting imaging errors for a telescope by referencing a field of view of the telescope is used to replace the need of a guide star and the related use of centroid techniques with the guide star. In order to accomplish this, this method uses the full frame of a supplemental camera for both auto-guiding and auto-focusing. All of the guider frame is used to retrieve focus and directionality information for auto-focus, but without the need of a specific guide star. This method uses any astronomical feature and structure, such as galaxies, nebulae, clusters, stars, etc., for retrieving image focus information (from the latest guider frame) to compute auto-focus and related focuser corrections, including the direction of the correction (in or out).