LiDAR Distance-Difference Detection for Ground Subsidence
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Solution Overview
Problem
Existing systems struggle to accurately measure ground subsidence over large areas due to the difficulty in maintaining orientation and distance measurements with optical components, especially at long distances, and are affected by environmental factors like temperature changes.
Innovation Solution
A LiDAR-based system with at least two reflection units and a LiDAR device installed at a preset height, measuring distance differences between the device and the units to detect ground subsidence, using interference techniques to compensate for environmental variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If optical components are used to measure ground subsidence at long distance, then the measurement area can be covered, but the measurement precision deteriorates due to difficulty in maintaining orientation and distance measurements
Solution Approach 1:
The patent replaces traditional optical measurement systems with LiDAR (Light Detection and Ranging) technology. The LiDAR device emits laser beams to measure distances to reflection units installed on the ground surface, enabling precise ground subsidence measurement over large areas without requiring complex orientation maintenance mechanisms.
Solution Approach 2:
The patent introduces reflection units as intermediary objects installed on the ground surface. These reflection units serve as stable reference points that reflect laser beams back to the LiDAR device, enabling accurate distance measurements even over long distances and large areas without requiring the measurement system itself to maintain precise orientation.
2Reliability
If optical components are used for ground subsidence measurement, then the system can detect subsidence, but the reliability deteriorates due to environmental factors like temperature changes
Solution Approach 1:
The patent replaces optical measurement systems with LiDAR technology that uses laser beams and electronic detection. This substitution reduces sensitivity to environmental factors such as temperature changes, as the LiDAR system measures the time of flight of laser pulses rather than relying on optical path length changes that are affected by thermal expansion and refraction.
Solution Approach 2:
The patent changes the measurement parameter from optical path length (which is affected by temperature) to time of flight of laser pulses. This parameter change makes the measurement system less sensitive to environmental factors, as the speed of light in air is relatively constant and can be compensated for, providing more reliable subsidence detection across varying environmental conditions.
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 and reliable detection of ground subsidence by measuring distance differences rather than absolute distances, overcoming accuracy issues and environmental interference.
Implementation Method 1
a LiDAR device disposed within a preset radius from the structure and configured to detect whether the ground has subsided and the extent of ground subsidence based on a distance difference between the LiDAR device and each of the reflection units
Implementation Method 2
at least two reflection units installed in a structure disposed within an area where the subsidence of a ground is to be examined and each configured to reflect light incident thereon
Data Source
AI summary
Disclosed are a device and system for detecting ground subsidence by using a LiDAR technology. The system for detecting ground subsidence, which detects whether the ground has subsided within an area where the subsidence of the ground will be examined includes at least two reflection units installed in a structure disposed within an area where the subsidence of a ground will be examined and each configured to reflect light incident thereon, and a LiDAR device disposed within a preset radius from the structure and configured to detect whether the ground has subsided and the extent of the ground subsidence based on a distance difference between the LiDAR device and each of the reflection units.