Scanning Mirror Grating for Position Monitoring
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Solution Overview
Problem
Existing optical scanning technologies lack effective methods for monitoring the operation and calibration of scanning mirrors, which can lead to inaccuracies and malfunctions, particularly in 3D mapping applications.
Innovation Solution
A grating is formed on the scanning mirror to diffract a portion of the beam at specific angles, allowing the controller to detect and monitor the scan, calibrate the angular scale and speed, and verify proper operation by detecting diffraction lobes, thereby enhancing the safety and accuracy of the scanning process without requiring additional hardware.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a grating is formed on the scanning mirror to enable monitoring and calibration, then the reliability and measurement precision are improved, but the device complexity increases
Solution Approach 1:
The grating is integrated directly onto the scanning mirror surface, merging the monitoring function with the scanning component. This eliminates the need for separate monitoring hardware while enabling reliable detection of mirror position and scan characteristics through diffraction patterns.
Solution Approach 2:
The scanning mirror itself serves dual purposes: performing the scanning function and simultaneously providing monitoring capabilities through its own grating structure. The mirror monitors its own position and scan characteristics without requiring external monitoring devices.
2Measurement precision
If additional hardware is added for monitoring mirror operation, then the measurement precision improves, but the device complexity and cost increase
Solution Approach 1:
The system uses the scanning mirror's own grating structure to provide monitoring capabilities, eliminating the need for external monitoring hardware. The mirror detects its own position and scan characteristics through diffraction patterns generated by the grating.
Solution Approach 2:
The scanning mirror is designed to perform multiple functions: scanning the beam and simultaneously monitoring its own operation through the integrated grating. This multi-functionality reduces the overall device complexity while maintaining high measurement precision.
3Manufacturing precision
If the grating is formed by photolithography on the mirror, then the manufacturing precision improves, but the manufacturing complexity increases
Solution Approach 1:
The grating parameters such as line density, depth, and width are optimized to achieve the required manufacturing precision while remaining compatible with standard photolithography processes. By adjusting these parameters, high precision can be achieved without excessive manufacturing complexity.
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 enables reliable monitoring and calibration of scanning mirrors, ensuring accurate 3D mapping and preventing malfunctions by utilizing existing components, thus improving the safety and accuracy of optical scanning systems.
Implementation Method 1
A grating is formed on an optical surface in the apparatus and is configured to diffract a portion of the beam at a predetermined angle, so as to cause the diffracted portion to be returned from the scanning mirror to the receiver
Data Source
AI summary
Scanning apparatus includes a transmitter, which is configured to emit a beam comprising pulses of light, and a scanning mirror, which is configured to scan the beam over a scene. A receiver is configured to receive the light reflected from the scene and to generate an output indicative of the pulses returned from the scene. A grating is formed on an optical surface in the apparatus and is configured to diffract a portion of the beam at a predetermined angle, so as to cause the diffracted portion to be returned from the scanning mirror to the receiver. A controller is coupled to process the output of the receiver so as to detect the diffracted portion and to monitor a scan of the mirror responsively thereto.