Movable Panel Reflectivity Measurement for Painted Objects
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Lidar systems used in autonomous vehicles struggle to accurately measure the lidar-reflectivity of painted objects, particularly at laboratory scales, due to their inability to adjust the angle of incidence and limited sensitivity to small samples with varying paint coatings.
Innovation Solution
A system comprising an electromagnetic wave source, a movable panel, a reflector, and a detector, connected to a control unit, which adjusts the incident angle of the electromagnetic wave and determines the reflectivity of painted objects by measuring the intensity of retroreflected waves over a range of angles, allowing for high angular resolution and dynamic range measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a standard lidar system is used to measure reflectivity, then the measurement can be performed with existing technology, but the measurement precision is insufficient for small samples with varying paint coatings
Solution Approach 1:
The system employs a movable panel that can be rotated to adjust the incident angle of the electromagnetic wave onto the painted object. This dynamic adjustment capability allows the system to measure reflectivity at multiple angles, thereby improving measurement precision for small samples with varying paint coatings that have different reflective properties at different angles.
Solution Approach 2:
A reflector is introduced as an intermediary component to receive and redirect retroreflected electromagnetic waves toward the detector. This mediator enables the system to capture waves that would otherwise be lost, significantly enhancing the detection capability for small samples and improving the overall measurement precision.
2Adaptability or versatility
If the incident angle is fixed, then the device structure is simplified, but the adaptability to measure different paint coatings is reduced
Solution Approach 1:
The panel is designed to be movable and rotatable, allowing dynamic adjustment of the incident angle. This enables the system to adapt to different paint coatings by measuring reflectivity at multiple angles, capturing the angular dependence of reflectivity that characterizes different coating types.
Solution Approach 2:
The system changes the incident angle parameter by rotating the panel to different positions. By measuring reflectivity across a range of incident angles, the system can characterize different paint coatings based on their distinct angular reflectivity signatures, thereby improving adaptability without requiring multiple fixed-angle devices.
3Measurement precision
If the panel is stationary, then the ease of operation is improved, but the measurement precision over a range of angles is reduced
Solution Approach 1:
The panel is made movable with rotational capability, allowing the incident angle to be adjusted to different positions. This dynamic feature enables precise angular resolution measurements by systematically varying the incident angle and measuring reflectivity at each angle, thereby achieving high angular resolution precision.
Solution Approach 2:
The control unit receives signals from the detector and processes the reflected wave intensity data to determine reflectivity characteristics. This feedback mechanism automatically calculates and analyzes the measurements, reducing manual intervention and maintaining ease of operation despite the added capability for angular variation.
4Measurement precision
If retroreflected waves are not collected, then the device complexity is reduced, but the measurement sensitivity is insufficient
Solution Approach 1:
A reflector is positioned to receive retroreflected electromagnetic waves from the painted object and redirect them toward the detector. This intermediary component captures waves that would otherwise be lost, significantly enhancing measurement sensitivity by ensuring that reflected energy is efficiently collected and directed to the detection system.
Solution Approach 2:
The reflector serves multiple functions: it collects retroreflected waves from various angles, redirects them toward the detector, and enhances the overall signal strength. This multi-functional component improves measurement sensitivity without requiring a completely separate collection system, thereby limiting the increase in device complexity.
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 precise measurement of lidar-reflectivity of small painted samples as a function of incident angle, improving the characterization of paint coatings and enhancing the detection capabilities of lidar systems in autonomous vehicles.
Implementation Method 1
an electromagnetic wave source that is configured to emit an electromagnetic wave
Implementation Method 2
a reflector that is arranged to receive and direct electromagnetic waves that are retroreflected by the painted object
Data Source
Figure 1
Figure 2~4
Figure 5~6
AI summary
A system for measuring the reflectivity of a painted object includes an electromagnetic wave source that emits an electromagnetic wave, a panel that holds the painted object, with the panel being movable to adjust an incident angle of the electromagnetic wave onto the panel, a reflector to receive and direct electromagnetic waves that are reflected by the painted object towards the reflector, a detector to detect an intensity of electromagnetic waves, and a control unit. The control unit is communicatively connected to the panel and to the detector. The control unit determines the incident angle of the electromagnetic wave, receives the intensity of the electromagnetic wave detected by the detector, and determines the reflectivity of the painted object as a function of the intensity of the electromagnetic wave detected by the detector over a predetermined range of incident angle values.