Optical Unit Speckle Pattern Generation for Displacement Measurement
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Solution Overview
Problem
Existing speckle image capturing technologies face challenges in achieving both sufficient speckle diameter and expanding the target region, as increasing the target region results in a smaller speckle diameter, making it difficult to detect displacement and vibration accurately.
Innovation Solution
An optical unit that radiates coherent light in a pattern with uniformly arranged bright and dark regions within the target area, allowing for flexible setting of the target region while maintaining necessary speckle diameter, using a filter to block coherent light according to a predetermined pattern that includes slit or spot bright regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the target region is expanded, then the measurement coverage is improved, but the speckle diameter becomes smaller
Solution Approach 1:
The patent divides the target region into multiple measurement regions and uses multiple photoelectric sensors to capture speckle images simultaneously. Each sensor captures speckle patterns from a specific sub-region, maintaining sufficient speckle diameter in each region while collectively covering a larger target area. This segmentation approach resolves the contradiction by allowing both expanded coverage and preserved speckle quality.
Solution Approach 2:
The patent arranges multiple photoelectric sensors in a specific spatial configuration (e.g., along a line or in a matrix) to capture speckle images from different positions. By utilizing the spatial dimension, the system achieves both large target region coverage and adequate speckle diameter through multi-point measurement rather than single-point measurement.
2Area of stationary object
If the target region is expanded, then the measurement coverage is improved, but the displacement detection accuracy deteriorates
Solution Approach 1:
By dividing the large target region into multiple smaller measurement regions, each captured by a dedicated photoelectric sensor, the system maintains high displacement detection accuracy in each sub-region while achieving comprehensive coverage of the expanded target area. The segmentation ensures that speckle patterns remain distinct and measurable in each region.
Solution Approach 2:
The patent combines the measurement results from multiple photoelectric sensors to achieve comprehensive displacement detection across the expanded target region. By merging data from multiple sensors that each maintain high local accuracy, the system achieves both expanded coverage and preserved measurement precision.
3Area of stationary object
If the target region is expanded, then the measurement coverage is improved, but the vibration detection accuracy deteriorates
Solution Approach 1:
The patent segments the expanded target region into multiple measurement zones, with each zone monitored by a separate photoelectric sensor. This segmentation maintains sufficient speckle diameter and vibration detection accuracy in each sub-region while achieving comprehensive coverage of the entire target area.
Solution Approach 2:
By utilizing multiple sensors arranged in spatial dimensions, the system captures vibration information from different locations simultaneously. This multi-dimensional approach allows the expanded target region to be monitored with maintained vibration detection accuracy through parallel measurement channels.
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 the expansion of the target region while ensuring a sufficient speckle diameter, improving the accuracy of detecting displacement and vibration by reducing erroneous detection and maintaining robustness in speckle image analysis.
Implementation Method 1
When coherent light such as laser is radiated toward epidermis of a living body or the like, reflected and diffused lights interfere with each other to form a granular image which is called speckle.
Implementation Method 2
a light reception unit that receives a reflected light of the coherent light in the target region
Data Source
AI summary
Provided is an optical unit that radiates a coherent light such that the coherent light is incident in a target region of speckle image capturing in accordance with a pattern that includes a bright region and a dark region located uniformly in at least one direction in the target region. Provided is a measurement system including: an optical unit that radiates a coherent light such that the coherent light is incident in a target region in accordance with a pattern that includes a bright region and a dark region located uniformly in at least one direction in the target region; a light reception unit that receives a reflected light of the coherent light in the target region; and an imaging unit that captures an image of a speckle included in the reflected light.