3D Measurement Device Splitting Reflected Light for High Reflectivity
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Solution Overview
Problem
Three-dimensional measurement devices face challenges in acquiring data from highly reflective objects due to overwhelming intensity of reflected light, leading to a limited dynamic range and increased scanning time.
Innovation Solution
A three-dimensional measurement device that splits reflected distance measurement light into two components with different intensities, attenuating the second component to prevent dynamic range overload, allowing for simultaneous detection of both high and low intensity signals without requiring additional measurement modes, thereby expanding the dynamic range and reducing scanning time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the three-dimensional measurement device uses normal scanning to measure highly reflective objects, then the scanning time is reduced, but the reflected light intensity overflows the dynamic range causing measurement failure
Solution Approach 1:
The reflected light is divided into two separate light paths using a beam splitter. One path receives light with higher intensity directly, while the other path receives light that has been attenuated by an optical attenuator. This segmentation allows the system to handle both highly reflective and low-reflective surfaces simultaneously without overflow or insufficient signal.
Solution Approach 2:
An optical attenuator is introduced as an intermediary element in one of the light paths. This attenuator reduces the intensity of reflected light from highly reflective surfaces to a level that fits within the dynamic range of the photodetector, preventing overflow while preserving measurement capability.
2Reliability
If the measurement device performs repeated measurements with different modes to handle highly reflective portions, then the measurement accuracy is improved, but the scanning time increases significantly
Solution Approach 1:
The system merges multiple measurement capabilities into a single scanning operation. By using a beam splitter to create parallel light paths (one with attenuation, one without), the device can simultaneously measure both highly reflective and low-reflective surfaces in one pass, eliminating the need for repeated measurements with different modes.
Solution Approach 2:
The light receiving and splitting unit provides multi-functionality by handling both high-intensity and low-intensity reflected light through its dual-path configuration. This universal design allows the same hardware to adapt to various reflectivity conditions without requiring mode changes or additional measurement passes.
3Device complexity
If the device uses a single light path to receive reflected light, then the device complexity is reduced, but the dynamic range is limited and cannot handle highly reflective objects
Solution Approach 1:
The system dynamically adapts to different reflectivity conditions by using a beam splitter to create two parallel processing paths. One path handles high-intensity light from reflective surfaces through attenuation, while the other handles low-intensity light directly. This dynamic configuration expands the effective dynamic range without requiring complex adjustable components.
Solution Approach 2:
The system changes the intensity parameter of the reflected light by introducing an optical attenuator in one of the light paths. This parameter modification allows the system to handle a broader range of reflected light intensities, effectively expanding the dynamic range while maintaining relatively simple hardware architecture.
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 device effectively acquires three-dimensional data from highly reflective objects by expanding the dynamic range and shortening scanning time, ensuring comprehensive data capture without the need for repeated measurements.
Implementation Method 1
a light receiving and splitting unit that splits the reflected distance measurement light that has transmitted through the light receiving optical unit into first reflected split light and second reflected split light
Implementation Method 2
attenuates intensity of the second reflected split light to be lower than intensity of the first reflected split light
Implementation Method 3
converts the first reflected split light and the second reflected split light into electrical signals
Data Source
AI summary
A three-dimensional measurement device includes a light source unit that emits distance measurement light, a projection light optical system that causes the distance measurement light, emitted by the light source unit, to be emitted along a distance measurement light axis, a light receiving optical unit that receives the reflected distance measurement light, a light receiving and splitting unit that splits the reflected distance measurement light that has transmitted through the light receiving optical unit into first reflected split light and second reflected split light, attenuates intensity of the second reflected split light to be lower than intensity of the first reflected split light, and converts the first reflected split light and the second reflected split light into electrical signals, and angle detection units that detect a light emitting direction of the distance measurement light.