Light Position Measurement with Atmospheric Wavefront Correction
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Solution Overview
Problem
Existing position measurement devices using light beams are affected by atmospheric distortions such as temperature, pressure, and humidity variations, leading to measurement errors and requiring lengthy data sampling to minimize these errors.
Innovation Solution
A device that incorporates a wavefront sensor to measure and correct for atmospheric distortions, either by discarding distorted data or using adaptive optics to reshape the beam, ensuring accurate position measurements in real-time across multiple degrees of freedom.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional beam position sensing is used without atmospheric correction, then the device structure remains simple, but measurement precision deteriorates due to atmospheric distortions
Solution Approach 1:
A wavefront sensor is introduced as an intermediary device to measure atmospheric distortions. The sensor detects wavefront aberrations caused by atmospheric turbulence and provides correction data, acting as a mediator between the light beam and the position sensing device to eliminate measurement errors without requiring complex structural changes to the entire system
Solution Approach 2:
The system implements feedback by using wavefront sensor data to continuously monitor and correct for atmospheric distortions. The measured wavefront aberrations are fed back to adjust the position measurements in real-time, compensating for atmospheric effects and maintaining measurement precision despite environmental variations
2Reliability
If filtering methods such as averaging are used to reduce atmospheric distortion impact, then measurement reliability improves, but productivity decreases due to lengthy sampling periods
Solution Approach 1:
The system replaces mechanical/time-based filtering methods (averaging over long periods) with an optical/electronic solution. The wavefront sensor provides real-time measurement of atmospheric distortions, allowing instantaneous correction of position measurements without requiring extended sampling periods or time-averaging techniques
Solution Approach 2:
The wavefront sensor performs preliminary measurement of atmospheric distortions before they affect the position sensing device. By detecting wavefront aberrations in advance and applying corrections proactively, the system eliminates the need for post-measurement filtering or lengthy averaging processes, achieving both high reliability and fast measurement speed
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 position measurements in environments prone to atmospheric distortions by using wavefront sensor data to correct beam position measurements, improving the reliability of six-degree freedom measurements.
Implementation Method 1
A wavefront sensor measures atmospheric distortions
Implementation Method 2
the wavefront sensor data can be used to control an adaptive optic that has the ability to receive a distorted beam and then transmit an undistorted beam
Data Source
AI summary
A position measurement system is configured to measure its position in one or more degrees of freedom with respect to a beam of light while addressing errors caused by atmospheric distortions. Atmospheric distortions can be measured using a wavefront sensor. Data from such a sensor can be used in combination with a beam position sensing device, such that wavefront data can determine if beam position device data should be discarded or can be used to correct the beam position device mathematically. Alternately, the wavefront sensor data can be used to control an adaptive optic that has the ability to receive a distorted beam and then transmit an undistorted beam to the beam position sensing device, eliminating the need to mathematically correct the data from the beam position sensing device. Finally, the wavefront sensor itself can be used to both measure wavefront distortions as well as determine beam position.