Optical Sensor Light-Blocking Structure for Stray Light Control
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Solution Overview
Problem
Optical sensors face detection inefficiencies due to large-angle stray light interference in the detecting light beam, which affects the accuracy of parameters like distance, azimuth, and shape of target objects.
Innovation Solution
An optical emitting device with a light-blocking structure comprising multiple light-blocking sheets arranged in a preset direction within the emitting cavity, creating an extinction space to block and dissipate stray light, ensuring the light beam emitted is within a preset angle range, thereby reducing stray light interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a light source emits a detecting light beam to a target object, then the optical sensor can obtain distance, azimuth, height, speed, attitude, shape and other parameters of the target object, but large-angle stray light is generated in the detecting light beam which affects the detection effect
Solution Approach 1:
The light-blocking structure is divided into multiple light-blocking sheets arranged in sequence within the emitting cavity. Each sheet segments the optical path to block stray light at different angles, effectively dividing the harmful stray light into manageable sections that can be blocked individually while maintaining the overall detection function.
Solution Approach 2:
The patent extracts and removes the harmful large-angle stray light from the detecting light beam by introducing a dedicated light-blocking structure. This structure selectively blocks stray light while allowing the useful detecting light beam to pass through, separating the harmful component from the useful signal.
2Reliability
If a light-blocking structure is introduced to block stray light, then the detection effect is improved, but the device complexity increases
Solution Approach 1:
The light-blocking structure serves multiple functions: it blocks large-angle stray light, defines the emission angle range, and maintains the integrity of the detecting light beam. By combining these functions into a single structure, the patent avoids adding multiple separate components, thereby improving reliability without proportionally increasing complexity.
Solution Approach 2:
The multiple light-blocking sheets are nested within the emitting cavity in a compact arrangement. Each sheet is positioned at a specific location within the cavity, creating a nested structure that maximizes the light-blocking effectiveness while minimizing the space occupied and maintaining structural compactness.
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
This solution effectively minimizes the impact of stray light on the detection effect, optimizing the point cloud effect and enhancing the accuracy of optical sensors by ensuring most of the light beam is within the desired angle range, improving the overall detection performance.
Implementation Method 1
reflected multiple times in the extinction space between the two adjacent first light-blocking sheets, which can effectively dissipate the energy of the large-angle stray light
Implementation Method 2
effectively dissipate the energy of the large-angle stray light and achieve a function of near extinction
Data Source
AI summary
An optical emitting device and an optical sensor are provided. The optical emitting device includes a body, a light source, and a first light-blocking structure. The body has an emitting cavity extending in a first preset direction. The emitting cavity has an incident light port and an emergent light port that are arranged in the first preset direction. An inner wall of the emitting cavity has a first inner wall portion and a second inner wall portion. The first inner wall portion and the second inner wall portion are oppositely arranged. The light source and the body are arranged in the first preset direction. The first light-blocking structure is arranged in the first inner wall portion of the emitting cavity. A light-transmitting channel is arranged between the first light-blocking structure and the second inner wall portion. The first light-blocking structure includes a plurality of first light-blocking sheets.