Laser Scanner Dynamic Threshold Control for Noise Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional laser scanners face challenges in maintaining measurement accuracy due to varying light receiving intensity, which can result in noise and inaccurate data acquisition, as the fixed threshold value is not adaptable to changes in light reflection properties of the object being measured.
Innovation Solution
A laser scanner with an arithmetic control unit that includes a light receiving intensity judging component and a threshold value setting component, allowing for dynamic adjustment of the threshold value based on real-time light receiving intensity, ensuring reliable detection of reflected distance measuring light and reducing noise by setting appropriate thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed threshold value is used for light receiving detection, then the device complexity is reduced, but the measurement precision deteriorates due to noise and inaccurate data acquisition under varying light conditions
Solution Approach 1:
The threshold value is changed from a fixed parameter to a dynamic parameter that automatically adjusts based on the measured light receiving intensity. The arithmetic control unit continuously monitors the light receiving intensity and modifies the threshold value accordingly, enabling the system to adapt to varying reflection properties of different objects and maintain high measurement precision without increasing device complexity
Solution Approach 2:
The threshold value parameter is modified based on the light receiving intensity parameter. When the light receiving intensity changes due to different object reflection properties or measurement distances, the threshold value is proportionally adjusted to maintain optimal detection accuracy, resolving the contradiction between simple fixed-threshold control and precise adaptive detection
2Measurement precision
If the threshold value is increased to reduce noise, then the measurement precision is improved, but the reliability deteriorates because weak reflected light signals may not be detected
Solution Approach 1:
The threshold value is dynamically adjusted based on the measured light receiving intensity. When the light receiving intensity is high (indicating good reflection conditions), the threshold is increased to reduce noise. When the light receiving intensity is low (indicating poor reflection or long distance), the threshold is reduced to ensure detection reliability. This proportional adjustment resolves the contradiction between noise reduction and detection reliability
3Ease of operation
If a fixed threshold value is used, then the ease of operation is improved, but the adaptability deteriorates when measuring objects with varying reflection properties
Solution Approach 1:
The system performs self-adjustment of the threshold value based on the measured light receiving intensity without requiring manual intervention. The arithmetic control unit automatically monitors the light conditions and modifies the threshold parameter accordingly, maintaining ease of operation while achieving high adaptability to different object reflection properties and measurement environments
Solution Approach 2:
A feedback loop is established where the light receiving intensity measurement feeds back to the threshold value control. The system continuously monitors the actual light conditions during measurement and adjusts the threshold value in real-time based on this feedback, enabling automatic adaptation to varying reflection properties while keeping the operation simple and intuitive
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 enhances measurement accuracy by adapting to varying light reflection conditions, ensuring reliable data acquisition and reducing noise, even under intense variations in the reflection properties of the object, while maintaining high accuracy without complex signal processing.
Implementation Method 1
a light receiving unit for receiving a reflected distance measuring light and for producing a light receiving signal
Data Source
AI summary
The invention provides a laser scanner, which comprises a light projecting unit for irradiating a distance measuring light, a light receiving unit for receiving a reflected distance measuring light, a distance measuring unit for performing a distance measurement based on a light receiving signal, a rotary deflecting unit for performing a rotary irradiation of the distance measuring light, and an arithmetic control unit, wherein the arithmetic control unit has a light receiving intensity judging component and a threshold value setting component, a light receiving intensity which is obtained by scanning the distance measuring light is inputted in advance to the threshold value setting component from the light receiving intensity judging component, the threshold value setting component sets a threshold value for detecting light receiving corresponding to the light receiving intensity, and the arithmetic control unit acquires a light receiving signal based on the threshold value and performs a distance measurement.