Heliostat Mirror Stabilization via Inertial Reference Beam
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Solution Overview
Problem
Heliostat mirror systems face challenges in stabilizing light beam propagation due to exogenous disturbances such as platform motion, structural dynamics, and atmospheric effects, making it difficult to maintain a stable line of sight, especially when mounted on vehicles.
Innovation Solution
The integration of an inertial reference unit with a control mechanism that optically samples the mirror's surface to adjust its angles, ensuring a virtual beam remains co-aligned with the line of sight vector, even under disturbances, using a suspension mechanism for movement and a combination of active and passive control to minimize vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the heliostat mirror system is mounted on a vehicle or mobile platform, then the system gains mobility and adaptability to different environments, but the platform motion and structural dynamics cause beam propagation instability and line of sight deviation
Solution Approach 1:
An inertial reference unit is introduced as an intermediary component that provides a stable reference frame independent of platform motion. The inertial unit measures platform disturbances, and this information is used to generate correction signals that compensate for the instability caused by mobility, thereby maintaining beam propagation stability while preserving system mobility
Solution Approach 2:
A feedback control loop is implemented where the inertial reference unit continuously monitors platform motion and structural dynamics, and the control mechanism uses this information to dynamically adjust the mirror angles. This closed-loop feedback system compensates for disturbances in real-time, maintaining stable line of sight despite platform motion
2Stability of the object's composition
If traditional stabilization systems are used to counteract platform motion, then beam stability is improved, but the system weight and structural complexity increase significantly
Solution Approach 1:
The patent replaces heavy mechanical stabilization systems with an optical-inertial reference system. Instead of using large mechanical gimbals or active vibration isolation mechanisms, the system uses an inertial reference unit combined with optical sampling and electronic control to achieve stabilization, dramatically reducing weight while maintaining line of sight stability
Solution Approach 2:
The system changes the approach to stabilization by transitioning from mechanical parameter control (physical positioning) to optical parameter control (beam direction correction through inertial reference and optical sampling). This parameter change enables stabilization with much lighter components
3Stability of the object's composition
If the mirror angles are adjusted frequently to compensate for disturbances, then line of sight stability is maintained, but the control system complexity and response time requirements increase
Solution Approach 1:
The inertial reference unit serves as an intermediary that simplifies the control problem by providing pre-measured platform disturbance data. This intermediary component decouples the complexity of platform motion analysis from the mirror control system, reducing control complexity while maintaining stable virtual beam alignment through direct use of inertial reference data
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 solution provides a lightweight, compact stabilization system capable of maintaining a stable line of sight on vehicles and in dynamic environments, suitable for high-altitude and space-based applications, with reduced weight and structural dynamics, enabling accurate image stabilization and tracking.
Implementation Method 1
produce a beam and use the beam to optically sample the second surface of the mirror, the beam at least reflecting from the second surface
Implementation Method 2
configured to reflect light directed towards a first surface of the mirror, the light being external to the heliostat
Implementation Method 3
connected the mirror by a suspension mechanism that allows the inertial reference unit to move in a first reference frame that is about inertial relative to a second reference frame of the mirror
Data Source
AI summary
A heliostat including a mirror configured to reflect light directed towards a first surface of the mirror, the light being external to the heliostat, the first surface being opposite a second surface of the mirror. A control mechanism is connected to the mirror and configured to change at least two angles of the mirror. An inertial reference unit is in communication with the control mechanism and configured to produce a beam and use the beam to optically sample the second surface of the mirror, the beam at least reflecting from the second surface. The control mechanism is configured to use data from the beam and the inertial reference unit to control the least two angles such that a virtual beam from the inertial reference unit remains about co-aligned with a line of sight vector of the mirror when the heliostat is subjected to an exogenous disturbance.