Thermal Beam Deflection for Optical Alignment
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Solution Overview
Problem
Existing beam tracking devices in optical arrangements are complex, expensive, and prone to mechanical errors, leading to inaccurate alignment of light beams due to environmental influences like thermal stress, especially over large distances.
Innovation Solution
A beam tracking device utilizing a thermal device coupled with an optical element to create a temperature gradient across the optical path, altering the light beam's direction through refractive index and geometric path length changes, allowing precise beam alignment without moving parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If mechanical deflection units with actuators are used to track the light beam, then the beam direction can be adjusted, but the device becomes structurally complex and expensive
Solution Approach 1:
The patent replaces mechanical actuators (stepper motors, plunger coils, magnets) with a thermal device that uses temperature gradients to deflect the light beam. The thermal device creates convection currents or changes the refractive index of a medium, achieving beam deflection without moving parts, thereby eliminating mechanical complexity while maintaining operational capability.
2Ease of operation
If mechanical actuators are used in the deflection unit, then beam tracking is possible, but the device has limited lifespan and requires maintenance
Solution Approach 1:
The patent eliminates mechanical actuators entirely and uses a thermal device that creates beam deflection through thermal effects (convection currents or refractive index changes). Since there are no moving parts, wear, friction, or mechanical failure modes are eliminated, significantly improving reliability and extending device lifespan while maintaining continuous beam tracking capability.
3Ease of operation
If mechanical deflection units are used, then beam direction control is achievable, but manufacturing tolerances prevent exact tracking accuracy
Solution Approach 1:
The patent replaces mechanical positioning systems with a thermal device that deflects beams through fluid dynamics or optical refraction. These thermal and optical effects are less sensitive to manufacturing tolerances because they rely on field effects rather than precise mechanical geometries, enabling more accurate beam tracking while maintaining directional control.
4Device complexity
If thermal devices are used to create temperature gradients for beam deflection, then mechanical components are eliminated, but energy is required to maintain temperature gradients
Solution Approach 1:
The patent may utilize phase transitions or thermal convection cycles that can be maintained with minimal energy input once initiated. The thermal device creates temperature gradients that drive natural convection currents or refractive index changes, and these thermal fields can persist with low power consumption compared to continuous mechanical actuation, especially when using passive thermal management or regenerative thermal cycles.
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 reliable, cost-effective, and precise beam tracking by compensating for environmental deviations without the need for mechanical components, ensuring accurate light beam alignment and reducing maintenance costs.
Implementation Method 1
the thermal device is set up to cool the optical element locally and/or to heat in order to generate in the optical element a temperature gradient running transversely to the direction of propagation of the light beam
Implementation Method 2
changes the direction of propagation of the light beam by a desired amount and/or in a desired direction through refractive index and geometric path length changes
Data Source
Figure 1
Figure 2~3
AI summary
The present invention relates to a beam tracking device for tracking a light beam in an optical arrangement, comprising a deflection unit configured to change the direction of propagation of the light beam, a spatially resolving light detector for detecting at least a part of the light beam, and a control unit connected to the deflection unit and the light detector, which is configured to determine, on the basis of detector signals generated by the light detector, a deviation of the impact position of the light spot from a target position and to control the deflection unit on the basis of the determined deviation in such a way that the deviation of the impact position of the light spot from the target position is compensated.The deflection unit is designed to comprise an optical element and a thermal device coupled to the optical element, the thermal device being configured to locally cool and/or heat the optical element in order to generate a temperature gradient in the optical element perpendicular to the direction of propagation of the light beam, which causes a corresponding gradient in the optical path length traversed by the light beam in the optical element, so that the direction of propagation of the light beam changes by a desired amount and/or in a desired direction.