Optical Instrument Calibration Error Correction via Lens Position Detection
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Solution Overview
Problem
Optical instruments face challenges in achieving high accuracy for calibration error correction, particularly in applications requiring precise angle measurements, where small errors can lead to significant positioning errors, and repeated calibration steps can reduce productivity.
Innovation Solution
A calibration error correction device that includes a detector for the focusing lens position, a memory to store viewing direction errors at various positions, and an indicator to specify the actual viewing direction by subtracting errors from the theoretical direction, allowing for accurate correction across different focus settings and positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional calibration methods are used to correct viewing direction errors, then measurement accuracy is improved, but productivity deteriorates due to repeated calibration steps
Solution Approach 1:
The patent applies preliminary action by pre-calibrating the optical instrument at multiple focusing lens positions during manufacturing and storing the calibration data in memory. This allows the instrument to automatically retrieve and apply appropriate calibration corrections during field operations without requiring repeated calibration steps, thus maintaining high measurement accuracy while improving productivity
Solution Approach 2:
The patent utilizes parameter changes by storing calibration parameters (viewing direction errors) for multiple focusing lens positions in memory. The system dynamically selects and applies the appropriate calibration parameters based on the current focusing lens position, enabling accurate error correction across different focus settings without manual recalibration
2Device complexity
If a single calibration is performed at one focusing lens position, then device complexity is reduced, but measurement precision deteriorates when the lens position changes
Solution Approach 1:
The patent applies segmentation by dividing the calibration data into multiple segments, each corresponding to a specific focusing lens position. The memory stores separate calibration parameters for each position, and the system selects the appropriate segment based on the current lens position, ensuring measurement precision without requiring a completely new calibration system
Solution Approach 2:
The patent implements universality by creating a multi-functional calibration system that handles multiple focusing lens positions with a single integrated approach. The memory unit stores and manages calibration data for various positions, and the processing unit automatically selects the appropriate calibration set, making the calibration system adaptable to different focus settings without additional hardware
Data Source
AI summary
A calibration error correction device for an optical instrument includes a detector operable to detect a position of a focusing lens of an optical instrument along a mechanical path of the focusing lens. A line of sight through an image plane of the optical instrument and the focusing lens at a present position defines an actual viewing direction. The device also includes a memory configured to store viewing direction errors specifying a deviation between a known theoretical viewing direction and the actual viewing direction associated with a plurality of different positions of the focusing lens along the mechanical path and an indicator of at least one value indicative of the actual viewing direction based on the theoretical viewing direction and the viewing direction errors at each of the different positions of the focusing lens along the mechanical path.