Laser Radar Rainfall Detection Using Reflector Width Measurement
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Solution Overview
Problem
Laser radar devices inaccurately determine rainfall due to light attenuation caused by dirt or flaws on the wall surface or irradiation surface, leading to false rainfall detection.
Innovation Solution
A laser radar system that measures the measurement width of a reflector using emitted and reflected laser light, determining rainfall based on a larger measured width than a predetermined reference, thereby distinguishing between rainfall and surface imperfections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If light attenuation is used to determine rainfall, then rainfall detection is achieved, but false detection occurs due to dirt or flaws on surfaces
Solution Approach 1:
The patent extracts the measurement of reflector width as a separate detection parameter from the traditional light attenuation method. By measuring the width of the reflected light beam at the reflector position, the system isolates a new measurement approach that is not affected by surface dirt or flaws, thereby resolving the false detection problem while maintaining rainfall detection capability
Solution Approach 2:
The patent introduces reflector width measurement as an intermediary parameter to indirectly detect rainfall. Instead of directly measuring light attenuation which is affected by surface conditions, the system uses the reflector width as a mediator that changes predictably with rainfall, providing a more reliable detection mechanism
2Productivity
If light attenuation method is used, then rainfall detection is implemented, but detection precision deteriorates due to surface conditions
Solution Approach 1:
The patent changes the detection parameter from light attenuation level to reflector width measurement. This parameter change allows the system to detect rainfall based on the broadening of the reflected light beam width, which is a fundamental optical effect that occurs during rainfall and is independent of surface dirt or flaws, thereby improving detection 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
Accurately detects rainfall by focusing on the increased measurement width of the reflector in rainy conditions, reducing the influence of surface conditions and improving detection precision.
Implementation Method 1
a laser radar optical system that emits laser light and receives reflected light of the laser light reflected from a reflector disposed outside the laser radar device
Implementation Method 2
determines that it is rainy weather when a measurement width of the reflector in a scanning direction of the laser light measured by use of the laser light and the reflected light is larger than a predetermined reference measurement width of the reflector
Data Source
AI summary
A laser radar device includes a laser radar optical system that emits laser light and receives reflected light of the laser light reflected from a reflector disposed outside the laser radar device. A controller determines that it is rainy weather when a measurement width of the reflector in a scanning direction of the laser light measured by use of the laser light and the reflected light is larger than a predetermined reference measurement width of the reflector.