研究目的
To design and control a scanning laser triangulation sensor that maintains the Scheimpflug condition while only scanning the illumination path with a compact fast steering mirror (FSM).
研究成果
The feasibility of an optical scanning system that maintains the Scheimpflug condition while only scanning the illumination path with a compact high-performance hybrid reluctance actuated fast steering mirror is demonstrated. The system achieves a closed-loop bandwidth of 1.4 kHz and can follow triangular signals up to 200 Hz, enabling a framerate of up to two frames per second for an image with 100x100 pixels.
研究不足
The framerate is strongly determined by the sample rate of the applied laser line sensor. Shading effects in the optical path can lead to missing measurement points, requiring interpolation for surface reconstruction.
1：Experimental Design and Method Selection:
The system design involves a scanning laser triangulation sensor with a novel high-performance compact FSM to scan the optical path. The design satisfies the Scheimpflug condition by optically positioning the FSM on the intersection line of the lens and image plane using a static mirror.
2：Sample Selection and Data Sources:
The sample used for validation is a hollow cylinder-shaped feature on a Duplo brick, with reference measurements obtained from previous experiments with a mechanical scanning system.
3：List of Experimental Equipment and Materials:
The setup includes a laser line sensor (LLT 2810-25), a compact FSM, a static mirror (PF05-03-P01), and a system analyzer (3562A).
4：Experimental Procedures and Operational Workflow:
The system is aligned according to the design, and raster trajectories are employed for scanning. Feedback controllers are designed using the H-approach for trajectory tracking.
5：Data Analysis Methods:
The surface profile of the sample is reconstructed from the measured data using geometrical relations derived from the system design.
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