Laser Distance Scanner Self-Calibration for Deflection Drift
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Distance measurement apparatuses using laser beams face performance degradation due to deviations in deflection angles caused by environmental factors and deterioration over time, leading to blind spots and reduced measurement accuracy.
Innovation Solution
A distance measurement apparatus with a controller that detects and corrects deflection angle deviations using a MEMS mirror and light receiving sensor, maintaining accurate distance measurement by comparing actual light entrance positions with reference positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If markers are placed on the laser beam path for calibration, then the scanner installation position and angle can be specified, but the markers block the laser beam creating blind spots and reducing measurement performance
Solution Approach 1:
The patent removes the markers from the laser beam path entirely. Instead of placing physical markers that block light, the system uses the light receiving sensor itself to detect the laser beam's actual position and calculate deflection angle deviations through software processing, eliminating the blocking problem while maintaining calibration capability
Solution Approach 2:
The patent introduces the light receiving sensor as an intermediary element. Rather than using markers as intermediaries that block the beam, the sensor detects the beam's position without obstruction, serving as a non-intrusive mediator that enables calibration while maintaining clear laser path
2Measurement precision
If the deflection angle deviates due to environmental factors and deterioration, then the distance measurement accuracy decreases, but adding complex calibration systems increases device complexity
Solution Approach 1:
The system performs self-calibration using its existing light receiving sensor and controller. The controller detects the actual laser beam position through the sensor and automatically calculates deflection angle deviations, enabling the system to self-correct without external calibration equipment or complex additional systems
Solution Approach 2:
The light receiving sensor serves multiple functions: it detects reflected light for normal distance measurement and simultaneously detects the laser beam's actual position for calibration. This multi-functionality eliminates the need for separate calibration hardware, reducing device complexity while maintaining measurement accuracy
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 apparatus maintains accurate distance measurement performance by correcting deflection angle deviations, preventing blind spots and ensuring consistent measurement ranges without the need for additional markers.
Implementation Method 1
a light source that emits a laser beam
Implementation Method 2
a deflector that deflects the laser beam emitted from the light source
Implementation Method 3
a light receiving sensor that receives a reflected light generated when the laser beam deflected by the deflector is irradiated onto the object
Data Source
AI summary
A distance measurement apparatus including: a light source that emits a laser beam; a deflector that deflects the laser beam emitted from the light source; a light receiving sensor that receives a reflected light generated when the laser beam is irradiated onto an object; and a controller that controls the light source and the deflector and measures the distance between the object based on the reflected light, where the controller detects a control deviation of the deflector based on a difference between a reference light entrance position of the laser beam on the light receiving surface of the light receiving sensor assumed for a rotation angle being set in the deflector and an actual light entrance position of the laser beam at the light receiving sensor determined based on the reflected light generated by actually operating the deflector at the rotation angle being set to deflect the laser beam.