Laser Radar Device Correcting Beam Shape Distortion
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Solution Overview
Problem
Laser radar devices face challenges in generating accurate three-dimensional information due to deviations caused by oblique or distorted laser beam irradiation axes, which affect the position coordinates of the measurement target area, especially when the laser beam is not formed into a perfect linear shape.
Innovation Solution
A laser radar device configuration that includes a scanner unit for scanning along a direction orthogonal to the laser beam, a received signal generation unit, a storage unit for shape distortion information, and a three-dimensional information generation unit that corrects position information using geometric methods and distance information to account for beam distortions, ensuring accurate three-dimensional data generation even with deviations in the laser beam's shape or orientation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If scanless configuration is implemented without a light-receiving side scanner, then device complexity is reduced, but measurement precision deteriorates due to position coordinate deviations
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing correction values for position coordinate deviations in a lookup table before actual measurement. The correction information storage unit stores correction values corresponding to different light-transmitting angles, which are calculated in advance based on the known optical path characteristics. During measurement, the three-dimensional information generation unit simply retrieves and applies the appropriate correction value, eliminating the need for real-time complex calculations while maintaining high measurement precision.
Solution Approach 2:
The patent introduces an intermediary element (correction information) that mediates between the simplified scanless configuration and accurate measurement. The correction information storage unit and three-dimensional information generation unit work together to provide a correction mechanism that compensates for the inherent position coordinate deviations caused by the scanless design, allowing the system to achieve both low complexity and high precision.
2Productivity
If a lens is introduced to form a line-shaped laser beam, then productivity is improved by enabling scanless operation, but manufacturing precision deteriorates due to beam shape distortion
Solution Approach 1:
The patent applies preliminary action by pre-characterizing the beam shape distortion caused by the lens and storing correction values in advance. The correction information is calculated based on the known lens properties and light-transmitting angles, allowing the system to compensate for manufacturing imperfections without requiring real-time adjustment or higher manufacturing precision.
Solution Approach 2:
The patent applies parameter changes by using the light-transmitting angle as a key parameter to select appropriate correction values. The correction information storage unit stores correction values indexed by light-transmitting angle, allowing the system to adapt to varying beam distortions caused by lens manufacturing tolerances by selecting the appropriate correction based on the actual operating 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
This configuration allows for accurate generation of three-dimensional information by correcting for shape distortions and deviations in the laser beam, enhancing the precision of the data obtained, even when the laser beam is not perfectly linear or is inclined, thus improving the overall accuracy of the measurement target area representation.
Implementation Method 1
a laser radar device is known which generates three-dimensional information of a measurement target area from the distribution of light-receiving signals obtained by irradiating the measurement target area with a laser beam while scanning the measurement target area with the laser beam and by receiving, with a light-receiving element, light reflected from an object or the like existing in the measurement target area
Implementation Method 2
The light-receiver optical system includes a light-receiver optical system for condensing the reflected light received by the light-receiver lens toward the line sensor array, and is configured such that a magnification at which the reflected light is condensed in the second direction is set higher than a magnification at which the reflected light is condensed in the first direction
Data Source
AI summary
A laser radar device includes a scanner unit for scanning a measurement target area along a second direction orthogonal to a predetermined first direction by irradiating the measurement target area with a line-shaped laser beam as a light-transmitting angle is changed, the line-shaped laser beam being a laser beam formed into a line shape so as to extend in the first direction, a received signal generation unit for generating a received signal according to received reflected light of the line-shaped laser beam, a storage unit for storing shape distortion information of the line-shaped laser beam in the second direction, and a three-dimensional information generation unit for generating three-dimensional information of the measurement target area based on corrected position information in the second direction obtained by correcting position information in the second direction calculated based on the received signal and the light-transmitting angle, with the shape distortion information.