Laser Scanner Tilt Detection via Pulsed Light Sequencing
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Solution Overview
Problem
Current laser scanners mounted on moving bodies, such as UAVs, require additional attitude measurement devices to acquire accurate three-dimensional point cloud data, leading to complex device configurations and increased costs due to the need for constant speed control and attitude measurement.
Innovation Solution
A laser scanner that shifts and pulsed-emits distance measuring lights to enable simultaneous detection of tilt and rotation, eliminating the need for additional attitude detectors and simplifying the device configuration, thereby reducing manufacturing costs and shortening data acquisition time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a one-dimensional laser scanner is mounted on a moving body, then the device configuration is simple, but additional attitude measurement devices and constant speed control are required to acquire accurate three-dimensional point cloud data
Solution Approach 1:
The patent combines multiple distance measuring lights into a single laser scanner device, allowing simultaneous measurement of multiple points on the measurement object. This integration eliminates the need for separate attitude measurement devices while maintaining measurement accuracy, as the multiple lights capture spatial information that inherently includes attitude data.
Solution Approach 2:
The patent transitions from one-dimensional scanning to multi-dimensional simultaneous measurement by employing multiple distance measuring lights that can measure different points at the same time. This dimensional expansion allows the system to capture both position and attitude information in a single measurement cycle, removing the requirement for additional attitude detectors.
2Measurement precision
If additional attitude measurement devices are provided, then accurate three-dimensional point cloud data can be acquired, but the device configuration becomes complicated and manufacturing cost increases
Solution Approach 1:
The laser scanner device is designed to perform multiple functions simultaneously: it measures both the position and attitude of the measurement object using its multiple distance measuring lights. This multi-functionality eliminates the need for dedicated attitude measurement devices, simplifying the overall system configuration while maintaining accurate three-dimensional data acquisition.
Solution Approach 2:
The system uses its own multiple distance measuring lights to self-determine both position and attitude information. By capturing measurements from multiple points simultaneously, the device can calculate its own spatial orientation and position without requiring external attitude sensors, achieving self-service functionality.
3Measurement precision
If constant speed control is implemented, then accurate measurement can be maintained, but the control system becomes complicated
Solution Approach 1:
The system performs preliminary measurements using multiple distance measuring lights to capture spatial information before processing. By simultaneously measuring multiple points in advance, the system can calculate position and attitude data without requiring continuous speed control during the measurement process, thereby simplifying the control system.
4Measurement precision
If multiple distance measuring lights are used simultaneously, then tilt and rotation can be detected, but the light emission timing control becomes complex
Solution Approach 1:
The multiple distance measuring lights are activated in periodic intervals rather than truly simultaneously. This periodic activation sequence allows the system to measure multiple points while maintaining simple timing control, as each light operates in a predetermined sequence that simplifies the control logic while still enabling tilt and rotation detection through the spatial distribution of measurements.
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 allows for accurate acquisition of three-dimensional point cloud data without additional attitude detectors, simplifying the device configuration, reducing costs, and shortening the time required for data acquisition.
Implementation Method 1
a distance measuring light projecting unit that projects distance measuring lights onto the measurement object; a light receiving unit that receives reflected light from the measurement object
Data Source
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AI summary
A laser scanner comprising a distance measuring light projecting unit for emitting at least two distance measuring lights at a known deflection angle with respect to a projecting optical axis, a distance measuring unit for receiving at least two reflected distance measuring lights and performing a distance measurement, respectively, an optical axis deflector for deflecting optical axes of the distance measuring lights and the reflected distance measuring lights at the same deflection angle in the same direction, a projecting direction detecting module for deflecting a deflection angle and a deflecting direction by the optical axis deflector, and an arithmetic control module, wherein the arithmetic control module performs a two-dimensional scanning with the distance measuring lights, draws at least two loci on a plane to be measured, and measures the plane to be measured along at least the two loci substantially at the same time by the distance measuring unit.