Surveying Instrument One-Dimensional Diffusion Optical Member
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Solution Overview
Problem
Existing surveying instruments using multi-stack lasers face errors in distance measurement due to manufacturing errors causing timing gaps in light emission, and errors occur in prism measurements depending on which part of the distance measuring light is reflected.
Innovation Solution
A surveying instrument is designed with a one-dimensional diffusion optical member, such as a slit plate, to uniform beam profiles of distance measuring lights and ensure overlapping portions where lights from all emitters overlap, allowing for accurate distance measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple light emitters are stacked to increase light amount and measurement distance, then the light amount and measurement distance are improved, but timing gaps due to manufacturing errors cause measurement precision to deteriorate
Solution Approach 1:
The invention divides the light emission process into two distinct phases: a first light emitter emits light during a first time period, and a second light emitter emits light during a second time period. This temporal segmentation eliminates the timing gap problem that occurs when multiple light emitters operate simultaneously, thereby maintaining measurement precision while still achieving increased light amount through sequential emission.
2Length of stationary object
If multiple light emitters are stacked to increase light amount, then the light amount is improved, but measurement distance is improved, yet device complexity increases
Solution Approach 1:
The invention uses the same type of light emitter (e.g., laser diode) for both the first and second light emitters, making them interchangeable and simplifying the overall structure. The control unit manages the sequential operation of these identical components, achieving extended measurement distance through increased light amount without significantly increasing device complexity.
3Illumination intensity
If distance measuring light is emitted without uniform beam profile, then light amount is sufficient, but measurement precision deteriorates due to errors depending on which part of the light is reflected
Solution Approach 1:
The invention performs preliminary beam profile uniformization by controlling the first light emitter to emit light with a first beam profile and the second light emitter to emit light with a second beam profile, where the profiles are designed to complement each other. This preliminary preparation ensures that when the light reflects off the prism, the measurement precision is maintained regardless of which part of the light is reflected.
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 achieves uniform beam profiles and reduces errors in distance measurement results, ensuring accurate calculations of three-dimensional coordinates and improving measurement accuracy by discarding results not obtained from the overlapping portion.
Implementation Method 1
a one-dimensional diffusion optical member, such as a slit plate, to uniform beam profiles of distance measuring lights
Implementation Method 2
the object is a corner cube having the retro-reflective property, and the distance measuring light diffused by the one-dimensional diffusion optical member is configured in such a manner that an overlapping portion in which lights emitted from the respective light emitters are all overlapped
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3C
AI summary
A surveying instrument include a distance measuring light projecting module having a light emitting module configured to project a distance measuring light to an object and a one-dimensional diffusion optical member configured to diffuse the distance measuring light in a one-dimensional direction, a distance measuring light receiving module having a photodetector configured to receive a reflected distance measuring light from the object, and an arithmetic control module configured to control the light emitting module and calculate a distance to the object based on a light reception result of the reflected distance measuring light with respect to the photodetector, wherein the light emitting module has at least two light emitters laminated in one direction, and the one-dimensional diffusion optical member is configured to diffuse the distance measuring light in a laminating direction of the light emitters.