Variable Optical Assembly Feedback Control for Drift and Hysteresis
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Solution Overview
Problem
Existing optical devices with variable optical power or beam deflection face challenges in achieving accurate control due to temperature dependencies, hysteresis, and long-term drift phenomena, leading to inaccuracies in predicting and adjusting optical parameters.
Innovation Solution
A controllable optical assembly with a transparent or reflective cover member, a deformable non-fluid body, and actuators and sensors to measure and adjust bending or tilt, using a combination of optical and deformation sensors for precise feedback control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If accurate calibration is used to control variable optical power or beam deflection, then control accuracy is improved, but the system becomes sensitive to temperature dependencies, hysteresis and long-term drift phenomena
Solution Approach 1:
The patent implements a feedback control system that continuously measures the actual optical power or beam deflection using optical sensors and compares it with the desired value. The control unit adjusts the actuator based on the error signal to maintain accurate control despite temperature variations, hysteresis, and creep effects.
Solution Approach 2:
The patent replaces traditional mechanical calibration methods with an optical measurement system. Optical sensors measure the actual optical parameters directly, eliminating the need for complex mechanical calibration procedures and providing real-time feedback that compensates for environmental factors.
2Adaptability or versatility
If a model is developed to predict changes in variable parameter caused by temperature, hysteresis and creep, then control capability is improved, but the model can only predict average values not exact values for each optical device
Solution Approach 1:
The feedback system directly measures the actual optical parameters for each specific optical device, replacing generic predictive models with device-specific real-time measurements. This eliminates the limitation of predicting only average values and provides exact control for each individual device.
Solution Approach 2:
The optical device performs self-measurement of its own optical parameters through integrated optical sensors. Each device independently monitors its actual performance and provides feedback to the control system, eliminating the need for external calibration equipment and providing device-specific accuracy.
3Ease of operation
If image sensor readings and processing are used to control optical power, then control is achieved, but adjustment speed is reduced compared to direct measurement methods
Solution Approach 1:
The patent replaces indirect image sensor-based control with direct optical measurement of the optical parameters themselves. Optical sensors directly measure optical power or beam deflection, eliminating the time-consuming image processing steps and enabling faster real-time control adjustments.
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 faster and more accurate adjustments of optical power and beam deflection by directly measuring lens bending or tilt, improving control accuracy and responsiveness.
Implementation Method 1
the first sensor is an optical sensor... arranged to provide the first measurement signal so that the measurement signal is indicative of the bending and/or tilt of the first cover member
Implementation Method 2
the second sensor is a deformation sensor... arranged to provide the second measurement signal so that the measurement signal is indicative of the bending and/or tilt of the first cover member
Implementation Method 3
one or more actuators arranged to generate a controllable bending and/or tilt of at least the first cover member dependent on a control signal
Data Source
AI summary
The invention relates to a controllable optical assembly such as a controllable lens or a controllable beam deflector. The optical assembly comprises first and second cover members, wherein one of them is transparent while the other is transparent or reflective. A transparent, deformable, non-fluid body is sandwiched between the first and second cover members so that the first and second cover members and non-fluid body constitute a lens or a light deflector. Actuators are arranged to generate a controllable bending and/or tilt of the first and/or the second cover member dependent on a control signal. One or more sensors are provided to generate a measurement signal indicative of the bending or tilt of the first and/or the second cover member. The control signal is determined based on the measurement signal.