Laser Scanner Deflection Control for Linear Object Measurement
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional laser scanners face challenges in efficiently and accurately measuring linear-shaped measurement objects, such as rebars, due to the need for high scan density and the limitations of visually setting localized measurement ranges or extracting edges from image data.
Innovation Solution
A measurement device equipped with a distance measuring unit, a deflecting unit, and a control unit that detects coordinates of intersection points between the measurement object and the scan trajectory, and controls the deflection operation to maintain constant intervals between adjacent intersection points, ensuring accurate measurement regardless of distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the laser scanner radiates measurement light at constant angular intervals in the vertical direction, then the scanning operation is simple, but the point density becomes lower as distance increases, reducing measurement accuracy
Solution Approach 1:
The patent applies dynamics by making the deflection angle of the measurement light variable rather than constant. The control unit dynamically adjusts the deflection angle based on the distance to the measurement object, increasing the deflection angle as distance increases to maintain constant point density. This resolves the contradiction by allowing the scanning operation to adapt to varying distances while maintaining measurement accuracy.
Solution Approach 2:
The patent changes the parameter of deflection angle from a fixed constant to a variable parameter that depends on distance. By establishing a relationship where the deflection angle increases with distance, the system maintains constant intervals between measurement points on the measurement object regardless of distance, thereby maintaining measurement accuracy while keeping the scanning operation relatively simple through automated parameter adjustment.
2Measurement precision
If scan density is increased to improve measurement precision of linear objects, then more measurement points are obtained, but the amount of scan data increases enormously, reducing productivity
Solution Approach 1:
The patent applies local quality by concentrating measurement points specifically along the linear measurement object rather than uniformly across the entire scan region. By controlling the deflection angle to maintain constant intervals only along the linear object, the system achieves high measurement precision for the target object while minimizing unnecessary data acquisition in other areas, thus improving productivity.
Solution Approach 2:
The patent segments the measurement task by focusing exclusively on linear-shaped measurement objects. The control unit identifies and targets only the linear object, adjusting the deflection pattern specifically for this geometry. This segmentation allows efficient data acquisition by ignoring non-linear portions of the scan region, reducing overall data volume while maintaining high precision for the target object.
3Measurement precision
If localized measurement range is set by visual determination or edge extraction, then high scan density can be applied to specific areas, but the setting operation becomes complicated and time-consuming
Solution Approach 1:
The patent applies self-service by enabling the control unit to automatically identify linear-shaped measurement objects and calculate appropriate deflection angles without operator intervention. The system autonomously determines the measurement range and parameters by detecting linear patterns in the scan data, eliminating the time-consuming visual determination or edge extraction processes while maintaining localized high scan density for the identified objects.
Solution Approach 2:
The patent performs preliminary action by pre-calculating the deflection angle settings based on detected linear object characteristics. Once a linear object is identified, the control unit预先 determines the optimal deflection angle pattern for that specific object, allowing immediate high-precision scanning without requiring operators to manually configure settings, thus reducing setup time while maintaining measurement 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
The solution enables efficient and accurate detection of coordinates for linear-shaped measurement objects at a constant point density, regardless of the distance from the measurement device, thereby improving measurement precision and efficiency.
Implementation Method 1
a light producing element that produces measurement light, and a measurement light emitting unit that emits the measurement light
Implementation Method 2
a light receiving unit that receives reflected measurement light, and a light receiving element that receives the reflected measurement light and generates a light reception signal
Implementation Method 3
a deflecting unit that deflects a direction of emission of the measurement light with respect to a reference optical axis
Data Source
AI summary
To efficiently and accurately detect coordinates positions of a measurement object formed in a linear shape regardless of a distance from a measurement light emitting unit. The provided survey system includes: a distance measuring unit; a deflecting unit for deflecting a direction of measurement light with respect to a reference optical axis and for scanning with the measurement light with respect to a prescribed center in a circumferential direction; and a calculation control unit which controls the distance measuring unit and the deflecting unit, wherein the calculation control unit detects coordinates of intersection points of a measurement object formed in a linear shape and a scan trajectory of the measurement light, and controls a deflection operation of the deflecting unit so that intervals of the intersection points adjacent to each other are constant intervals on the measurement object.