High-Speed Scanner-Tracker Mirror Assembly
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Solution Overview
Problem
Conventional fast steering mirrors used in LIDAR and LADAR systems are limited by slow scanning processes, particularly when a large reflecting surface is required, and lack precise control over mirror pose, which hampers accurate three-dimensional mapping and target location determination.
Innovation Solution
A high-speed scanner-tracker system with a rotating assembly and a mirror that can tilt and rotate using a bearing assembly, a rotational motor, and a tilt motor assembly with a coil and magnets, allowing for precise control over the mirror's position to achieve rapid scanning and accurate range information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a conventional fast steering mirror is used to scan a laser beam, then the system can perform basic scanning, but the scanning process is relatively slow due to limitations of the mirror design
Solution Approach 1:
The system segments the scanning function into two independent rotational assemblies: a first rotating assembly for azimuth scanning and a second rotating assembly for elevation scanning. Each assembly has its own motor and control system, allowing independent optimization of scanning speed and precision for each axis without compromising the other.
Solution Approach 2:
The patent implements dynamic scanning by allowing the mirror to perform rapid angular movements in both azimuth and elevation directions through independently controlled rotating assemblies. The system can dynamically adjust scanning patterns, speeds, and stop at predetermined locations, transforming the static mirror into a dynamically adaptable scanning platform.
2Area of stationary object
If a mirror with a relatively large reflecting surface is used, then the optical system can cover a wider field of view, but the scanning process becomes even slower
Solution Approach 1:
The system transitions from single-axis scanning to two-dimensional scanning by adding a second rotating assembly that operates in a different dimensional plane. The first assembly scans in the horizontal plane while the second assembly scans in the vertical plane, enabling the large mirror to cover a wider field of view without sacrificing scanning speed in either dimension.
3Measurement precision
If precise control of mirror position is required for accurate three-dimensional mapping, then the system can determine target location accurately, but the control system becomes more complex
Solution Approach 1:
The system incorporates feedback mechanisms through encoders or sensors on both rotating assemblies that continuously monitor the angular position of the mirror. This feedback is fed to the control system, which adjusts motor commands to achieve precise positioning and maintain accurate tracking of target locations in three-dimensional space.
Solution Approach 2:
The control system is designed to handle multiple functions through a unified architecture: it controls both rotating assemblies, processes feedback from both axes, manages predetermined stopping locations, and coordinates scanning patterns. This universal control approach manages complexity by consolidating control logic rather than requiring separate systems for each function.
4Manufacturing precision
If the mirror needs to be precisely controlled for accurate range information, then three-dimensional mapping precision is improved, but the system complexity increases
Solution Approach 1:
The system replaces complex mechanical positioning mechanisms with electromagnetic motor assemblies that provide precise control through electronic feedback. The motor assemblies with integrated encoders offer high-resolution angular control without the mechanical complexity of traditional gear-driven or cam-based positioning systems.
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 fast and precise scanning and tracking capabilities, enhancing the efficiency of LIDAR and LADAR systems by allowing for rapid rotation and tilt adjustments of the mirror, thereby improving the acquisition of three-dimensional data and target location accuracy.
Implementation Method 1
the coil is located proximate to a circumference of the mirror. The tilt motor assembly additionally includes at least a first magnet on a first side of the tilt axis, and a second magnet on a second side of the tilt axis... by passing a current through the coil in a first direction, opposite sides of the mirror can be moved in opposite directions, thereby tilting the mirror
Data Source
AI summary
Methods and systems for providing a high speed scanner tracker are disclosed. The scanner tracker can include a mirror assembly that rotates within a housing about a first axis. Moreover, the mirror can be tilted about a second axis. Pulses of light can be directed to and received from a selected location or target surface located within a target volume by selectively controlling the rotational and tilt angles of the mirror relative to a laser associated with the scanner tracker assembly.