Optical Scanning Apparatus Calibration Chart for Viewing Angle Measurement
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Solution Overview
Problem
Scanning endoscopes face challenges in accurately matching scanning positions with image pixel positions due to assembly errors and inclination of illumination light, leading to suboptimal viewing angles, which are not effectively addressed by existing calibration methods that focus on standard scanning trajectories without measuring scanning characteristics like angle of deviation and viewing angle.
Innovation Solution
A method and chart for measuring scanning characteristics that involve adjusting drive signals to form desired scanning areas on a chart with concentric viewing angle index patterns, allowing precise measurement of angle of deviation and viewing angle by positioning a bright spot at the chart's center and separating it by a predetermined distance, and adjusting frequency, amplitude, and phase differences of drive signals to inscribe the scanning trajectory within the desired viewing angle index patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing calibration methods are used to adjust scanning trajectory, then scanning trajectory can be standardized, but scanning characteristics such as angle of deviation and viewing angle cannot be accurately measured
Solution Approach 1:
A chart with concentric circular patterns serving as a reference standard is introduced as an intermediary element. The chart includes reference circles with known radii that enable measurement of angle of deviation and viewing angle without requiring complex measurement equipment. The chart acts as a mediator between the scanning apparatus and the measurement process.
Solution Approach 2:
The patent replaces complex mechanical measurement systems with an optical measurement approach. By using light scattering from the chart patterns and capturing images with a camera, the system substitutes mechanical trajectory measurement with optical imaging and image processing to determine scanning characteristics.
2Manufacturing precision
If assembly errors and illumination light inclination are present, then manufacturing is simplified, but scanning position and pixel position cannot be matched accurately
Solution Approach 1:
The patent implements a feedback mechanism where the actual scanning trajectory is measured using the chart and image capture device, then compared with the desired trajectory. Based on the measured angle of deviation and viewing angle, the drive signals to the actuator are adjusted to compensate for assembly errors and illumination inclination, achieving accurate positioning without requiring extremely precise manufacturing.
Solution Approach 2:
The system changes operational parameters (drive signal frequency, amplitude, and phase difference) to compensate for manufacturing imperfections. By adjusting these parameters based on measured scanning characteristics, the system achieves accurate scanning position matching even when assembly errors are present.
3Measurement precision
If standard calibration methods are used, then scanning trajectory can be controlled, but viewing angle and angle of deviation remain unmeasured
Solution Approach 1:
The patent uses light scattering and intensity changes from the chart patterns as detection signals. The chart's concentric circular patterns create specific light distribution patterns that can be captured and analyzed to determine viewing angle and angle of deviation, transforming difficult geometric measurements into optical detection problems.
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
Enables accurate measurement and adjustment of scanning characteristics, ensuring the scanning endoscope achieves the desired viewing angle and angle of deviation, enhancing its performance and reliability by allowing for real-time measurement and calibration of these critical parameters.
Implementation Method 1
an optical fiber for emitting the illumination light
Data Source
AI summary
A method of measuring scanning characteristics of an optical scanning apparatus allows measurement of scanning characteristics of an actuator. The method includes bringing a tip of the optical scanning apparatus and a chart for measuring scanning characteristics closer together and irradiating illumination light with the actuator in a non-driven state, separating the tip and the chart for measuring scanning characteristics by a predetermined distance while maintaining the relative orientations thereof, and adjusting a drive signal of the actuator so that a scanning area of the illumination light on the chart for measuring scanning characteristics can form a desired shape. At least one of an angle of deviation and a viewing angle is measured using an irradiation position of the illumination light on the chart for measuring scanning characteristics.