Diffractive Optical Distance Sensing for Multi-Pattern Depth Accuracy
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Solution Overview
Problem
Existing depth sensing technologies face challenges in accurately measuring distances due to interference from multiple light sources and complex environments, leading to inaccuracies in depth calculation.
Innovation Solution
A distance sensing apparatus and method utilizing a diffractive optical element with multiple sub-patterns to form distinct diffraction patterns at different distances, combined with algorithms to process light wave information, allowing for accurate distance measurement by selecting appropriate algorithms based on pattern recognition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single diffraction pattern is used for distance measurement, then the device structure is simple, but the measurement precision deteriorates due to interference from multiple light sources and complex environments
Solution Approach 1:
The diffractive optical element is divided into multiple sub-patterns (first sub-pattern, second sub-pattern, etc.), each corresponding to different distance ranges. This segmentation allows the system to use different diffraction patterns for different measurement scenarios, improving accuracy without requiring a completely complex redesign of the entire optical system.
Solution Approach 2:
Different sub-patterns within the diffractive optical element have different local optical properties optimized for specific distance ranges. The first sub-pattern is optimized for near-field measurement while the second sub-pattern is optimized for far-field measurement, allowing each region to perform its specialized function optimally.
2Measurement precision
If multiple diffraction patterns are imaged at different distances, then the measurement precision is improved, but the device complexity increases due to multiple algorithms and processing requirements
Solution Approach 1:
The system pre-establishes multiple algorithms corresponding to different diffraction patterns and distance ranges before actual measurement. During operation, the system selects and applies the appropriate pre-prepared algorithm based on the detected diffraction pattern, avoiding the need for complex real-time algorithm generation and reducing processing complexity.
Solution Approach 2:
The system changes algorithm parameters based on the detected diffraction pattern type. When a first diffraction pattern is detected, the first algorithm with its specific parameters is applied; when a second diffraction pattern is detected, the second algorithm with different parameters is applied. This parameter-based adaptation simplifies the decision-making process while maintaining high measurement precision.
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 more accurate distance measurement by imaging diffraction patterns at multiple distances and applying corresponding algorithms, enhancing precision in depth sensing applications.
Implementation Method 1
when passing through the diffractive optical element, the light ray forms a first diffraction pattern at a first distance and a second diffraction pattern at a second distance, respectively
Implementation Method 2
The sensing element is configured to sense and convert the light ray having the predetermined wavelength range into light wave information
Data Source
AI summary
A distance sensing method and apparatus are provided. The distance sensing apparatus includes: a transmit module and a receive module. An operand element of the receive module is configured to send a driving signal to a driving element of the transmit module to drive a light-emitting element to output a light ray having a predetermined wavelength range. After passing through a diffractive optical element of the transmit module, the light ray images a first diffraction pattern at a first distance and a second diffraction pattern at a second distance, respectively. A sensing element of the receive module is configured to sense and convert the light ray into light wave information. The operand element is configured to obtain a measured distance in accordance with the light wave information, a first algorithm corresponding to the first diffraction pattern, and a second algorithm corresponding to the second diffraction pattern.