DOE Beam Homogenization for Optical Measurement Accuracy
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Solution Overview
Problem
Coordinative measurement devices face challenges in achieving high accuracy due to complex optical paths, speckle interference, and inhomogeneous illumination, leading to measurement uncertainties and difficulties in target recognition, especially in varying environmental conditions.
Innovation Solution
The use of a diffractive optical element (DOE) in the measuring device to homogenize the measurement beam, reducing spatial and temporal intensity variations, and adapting the beam profile for improved accuracy and consistency across different angles and distances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a complex optical path is used in coordinative measurement devices, then measurement functionality is enhanced, but measurement precision deteriorates due to speckle interference and inhomogeneous illumination
Solution Approach 1:
A diffractive optical element (DOE) is introduced as an intermediary component in the optical path to homogenize the measurement beam. The DOE redistributes the beam intensity uniformly, eliminating speckle interference and inhomogeneous illumination effects, thereby maintaining high measurement precision while preserving complex measurement functionality
Solution Approach 2:
The beam parameters (intensity distribution, spatial coherence) are changed by passing through the DOE, which transforms the original laser beam into a homogenized beam with uniform intensity. This parameter change eliminates the harmful effects of speckle and inhomogeneous illumination on measurement accuracy
2Measurement precision
If the measurement beam divergence is reduced for non-cooperative targets, then distance measurement accuracy is improved, but target recognition capability deteriorates
Solution Approach 1:
The system dynamically adapts the beam characteristics using the DOE to provide optimal beam homogenization for different target types. For non-cooperative targets, the homogenized beam maintains appropriate divergence for both distance measurement accuracy and target recognition, eliminating the need to choose between the two opposing requirements
3Adaptability or versatility
If environmental conditions vary in rough environments, then measurement robustness is tested, but measurement precision deteriorates due to temperature and humidity variations
Solution Approach 1:
The diffractive optical element provides beforehand cushioning against environmental variations by creating a homogenized beam that is inherently more robust to temperature and humidity changes. The uniform intensity distribution reduces sensitivity to environmental perturbations, protecting measurement precision in rough environments
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
The homogenization of the measurement beam results in enhanced measurement accuracy, reduced uncertainty, and improved target recognition, even in challenging environmental conditions, by producing a uniform beam that is less affected by speckles and inhomogeneous illumination.
Implementation Method 1
The beam path has a diffractive optical element (DOE). The DOE is embodied such and arranged or arrangeable in the beam path such that the measurement beam is homogenized before emission
Data Source
AI summary
An optical measuring device having a base for placing the measuring device and a targeting unit that is rotatable with respect to the base and defines a target axis for targeting a target object that is to be measured. The targeting unit has a first beam path for emitting optical measurement radiation in the direction of the target object that is to be measured. The targeting unit furthermore has a diffractive optical element (DOE), which is arranged or arrangeable in the beam path such that the optical measurement radiation is homogenized.