Distance Measurement Device Scan Angle Detection Accuracy
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Solution Overview
Problem
Existing distance measurement technologies lack sufficient detection accuracy for scan angles when scanning objects with light, as they rely on inadequate methods to determine the precise angle of reflection.
Innovation Solution
A distance measurement device incorporating a light source, a reflective member that varies scan angles, a polarization optical member, and multiple light-receiving sections to improve scan angle detection accuracy by tracking the number of light reflections and associating it with distance measurement data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional distance measurement technology is used, then the basic distance measurement function is achieved, but the detection accuracy of scan angle is insufficient
Solution Approach 1:
The patent introduces a polarization optical member as an intermediary component between the reflective member and the light-receiving sections. This polarization optical member converts angular information into polarization state information, which can be detected with high precision. By using this intermediary, the system achieves accurate scan angle detection without requiring complex mechanical angle sensors or additional optical paths.
Solution Approach 2:
The patent utilizes changes in polarization parameters of light as the scan angle varies. The polarization optical member transforms the relationship between scan angle and detected signal, allowing the system to measure scan angles by detecting polarization state changes rather than direct angular displacement. This parameter transformation enables high-precision angle detection while maintaining relatively simple device structure.
2Measurement precision
If multiple light-receiving sections are added to improve angle detection, then measurement precision improves, but device complexity increases
Solution Approach 1:
The patent transitions from measuring position in spatial dimensions to measuring position through polarization state dimensions. Instead of using multiple light-receiving sections arranged in complex spatial configurations, the system uses a polarization optical member that encodes angular and positional information into the polarization state of reflected light. This allows accurate position detection using fewer physical sensors by exploiting the additional dimension of polarization information.
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
Enhances the detection accuracy of scan angles during distance measurement, allowing for more precise three-dimensional positional information acquisition of objects.
Implementation Method 1
a polarization optical member that guides the light reflected by the reflective member to the object to be measured
Implementation Method 2
a second light-receiving section that receives the light reflected by the reflective member and the polarization optical member
Data Source
AI summary
A distance measurement device includes a light source, a polarization optical member, a reflective member, a first light-receiving element, and a second light-receiving element. The reflective member varies a scan angle for scanning an object to be measured with light from the light source and reflects the light from the light source for each varied scan angle. The polarization optical member guides the light reflected by the reflective member to the object to be measured. The light-receiving element receives reflected light after the light guided by the polarization optical member is reflected by the object to be measured. In a case where the scan angle of the reflective member is a specific angle, the light-receiving element receives the light reflected by the reflective member and the polarization optical member in this order.