3D Surveying Device With Gradient Filter for Real-Time Ranging Correction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing three-dimensional surveying devices do not adequately address the issue of improving ranging precision during scanning operations due to the lack of real-time updates in correction values for distance measurements, which can be influenced by the warmup state of the device.
Innovation Solution
The device incorporates a reference light optical unit with a concentration-gradient-imparted filter that changes optical concentration along the scanning line of internal reference light, allowing for real-time acquisition of correction values during scanning operations, thereby enhancing ranging precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If correction values are updated only at the timing of laser beam transmission through the concentration-gradient-imparted filter during scanning operations, then device operation is simplified, but ranging precision deteriorates because correction values do not reflect real-time changes in warmup state
Solution Approach 1:
The patent implements continuous acquisition of correction values during scanning operations by utilizing the reference light optical unit to constantly monitor and update correction data based on the warmup state, rather than performing periodic or one-time updates. This ensures measurement precision is maintained throughout the scanning process.
Solution Approach 2:
The reference light optical unit provides real-time feedback on the warmup state by continuously acquiring correction values, which are then used to adjust distance measurements. This feedback mechanism allows the system to adapt to changing conditions during operation without requiring complex manual intervention.
2Measurement precision
If a rotation mechanism is added to change optical concentration of the concentration-gradient-imparted filter, then correction value acquisition capability is improved, but device complexity and size increase
Solution Approach 1:
The patent extracts the correction value acquisition function from the main scanning mechanism by implementing a separate reference light optical unit. This allows correction values to be acquired independently during scanning operations without requiring additional rotation mechanisms or modifying the existing scanning structure.
Solution Approach 2:
The reference light optical unit serves multiple functions: it provides internal reference light for distance measurement correction and simultaneously enables continuous acquisition of correction values during scanning operations. This multi-functionality eliminates the need for separate mechanisms while improving correction accuracy.
3Measurement precision
If the concentration-gradient-imparted filter is positioned to receive ranging light during scanning operations, then correction values can be updated in real-time, but light retention in circuits increases
Solution Approach 1:
The patent introduces an intermediary reference light optical unit that receives ranging light through the concentration-gradient-imparted filter during scanning operations. This intermediary structure enables real-time correction value acquisition while managing light retention by directing the light through a dedicated optical path rather than allowing it to scatter into surrounding circuits.
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 approach improves ranging precision by continuously updating correction values, simplifies the device structure, and reduces its size, while minimizing light retention in circuits.
Implementation Method 1
a concentration-gradient-imparted filter in which optical concentration of a region through which the internal reference light is transmitted changes along a scanning line of the internal reference light
Implementation Method 2
a reflecting sheet that performs retroreflection of the internal reference light transmitted through the concentration-gradient-imparted filter
Implementation Method 3
a scanning mirror that is provided so as to be capable of rotating about a rotation shaft in a state of being inclined as to a shaft center of the rotation shaft, and that performs rotational emission of the ranging light guided from the projected light optical unit in a plane that intersects the rotation shaft
Implementation Method 4
a photoreceptor that receives the reflected ranging light and the internal reference light guided from the reference light optical unit
Data Source
AI summary
Provided is a three-dimensional surveying device in which ranging precision of scanning can be improved.A three-dimensional surveying device includes a light source unit that discharges a ranging light, a projected light optical unit that emits the ranging light onto a ranging optical axis, a scanning mirror that performs rotational emission of the ranging light in a plane that intersects a rotation shaft, a light-receiving optical unit that receives reflected ranging light reflected at the measurement object and guided by the scanning mirror, a reference light optical unit that receives and also reflects the ranging light reflected at the scanning mirror as the internal reference light, and that is capable of changing quantity of light of the internal reference light, and a photoreceptor that receives the reflected ranging light and the internal reference light.