Laser Scanner Optical System with Correction Component
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Solution Overview
Problem
The cylindrical transmission window in laser scanners causes diffusion of distance measuring light, leading to a large irradiation spot diameter and reduced measurement accuracy due to optical actions, making it impossible to use small light receiving elements and increasing the dynamic range of received light.
Innovation Solution
An optical system with a correction optical component is introduced to offset the optical actions of the transmission window, which is designed as a cylindrical or conical curved surface, and the scanning mirror acts as a correction optical component to converge or diffuse the luminous flux in specific directions, preventing expansion of the luminous flux and improving measurement quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cylindrical transmission window is used to protect the scanning mirror, then the scanning mirror is protected and the structure is simplified, but the distance measuring light is diffused and the luminous flux cross-section is expanded
Solution Approach 1:
A correction optical component is introduced as an intermediary element between the transmission window and the scanning mirror. This component specifically counteracts the diffusion effect caused by the cylindrical transmission window, restoring the luminous flux to its original quality while allowing the transmission window to maintain its protective function.
Solution Approach 2:
The patent changes the optical parameters of the light path by introducing a correction optical component that modifies the luminous flux characteristics. This component adjusts parameters such as beam divergence and focal position to compensate for the diffusion caused by the cylindrical transmission window.
2Ease of operation
If the distance measuring light is transmitted through a cylindrical transmission window, then the light can enter and exit the scanning container, but the irradiating spot diameter becomes large and high angular resolution measurement becomes impossible
Solution Approach 1:
The correction optical component serves as a mediator that preserves the ease of light transmission through the transmission window while eliminating its harmful diffusion effect. The component is positioned to receive the diffused light and recollimate it, maintaining both transmission functionality and measurement precision.
3Ease of operation
If the reflected distance measuring light is received through the transmission window, then the light can be detected, but the small light receiving element cannot be used and the dynamic range increases causing measurement accuracy deterioration
Solution Approach 1:
The correction optical component acts as an intermediary for the reflected light path as well, positioned to receive the diffused reflected light and concentrate it onto the light receiving element. This allows small, high-precision photodetectors to be used while maintaining accurate measurement through the transmission window.
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 correction optical component effectively prevents the deterioration of distance measuring light quality, enhancing measurement accuracy and allowing for the use of smaller light receiving elements, thereby improving the overall performance of the laser scanner.
Implementation Method 1
a correction optical component for offsetting an optical action of the transmission window, which is provided at least in a middle of an irradiating optical path of the distance measuring light
Implementation Method 2
a scanning mirror rotating around a single axis and is designed so as to reflect the distance measuring light emitted from a distance measuring light source by the scanning mirror
Implementation Method 3
when the distance measuring light is transmitted through the transmission window, the distance measuring light is subjected to an optical action from the transmission window, the distance measuring light is diffused
Data Source
AI summary
An optical system of a laser scanner comprising: a light projecting system for projecting a distance measuring light, a scanning mirror for rotatably irradiating the distance measuring light from the light projecting system around a single axis and for making a reflected distance measuring light from an object to be measured enter a light receiving system, a transmission window for accommodating the scanning mirror and through which the distance measuring light and the reflected distance measuring light are transmitted, and a correction optical component for offsetting an optical action of the transmission window, which is provided at least in a middle of an irradiating optical path of the distance measuring light.