Laser Distance Measurement Device False Detection Prevention
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Solution Overview
Problem
Laser distance measurement devices face false detection issues when arranged face to face, as they sometimes receive laser beams from each other, leading to incorrect distance calculations.
Innovation Solution
Incorporating a memory for storing determination information and a processor to control laser beam emission and reception directions, determining the source of received laser beams based on reception direction, time, and intensity, and calculating distances only when the beam is reflected by a target.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two laser distance measurement devices are arranged face to face to measure distances simultaneously, then measurement coverage is improved, but false detection occurs when devices receive each other's laser beams
Solution Approach 1:
The system uses feedback by comparing the reception direction of the received laser beam with the emission direction of the device's own laser beam. When the reception direction matches the emission direction, the device identifies this as its own emitted beam (not a reflected beam from a target) and excludes it from distance calculation, thereby preventing false detection while maintaining simultaneous measurement capability
Solution Approach 2:
The control unit acts as an intermediary that mediates between the light reception unit and the distance calculation unit. It receives information about the reception direction and emission direction, compares them, and determines whether to allow distance calculation based on this comparison, thus preventing false detection caused by receiving the other device's laser beam
2Measurement precision
If laser beams are emitted and received to calculate distance, then distance measurement function is achieved, but incorrect distance is calculated when receiving beams from other devices
Solution Approach 1:
The system implements feedback by continuously monitoring the reception direction and comparing it with the emission direction. This feedback mechanism allows the device to identify when a received beam is its own emitted beam (indicating no target reflection) versus a reflected beam from a target, ensuring accurate distance calculation only when appropriate
Solution Approach 2:
The control unit serves as an intermediary that prevents incorrect distance calculation by filtering out measurements based on direction comparison. It ensures that distance is calculated only when the reception direction does not match the emission direction, thereby maintaining measurement precision and reliability
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 effectively prevents false detection by accurately determining the emission source of received laser beams, ensuring accurate distance measurements even when devices are synchronized for simultaneous scanning.
Implementation Method 1
a first light projection device that emits a first laser beam
Implementation Method 2
determining whether or not the laser beam received by the first light reception device is a laser beam reflected by a target
Implementation Method 3
calculating a distance to the target on a basis of a period of time between when the first light projection device emits the first laser beam and when the first light reception device receives the laser beam
Data Source
AI summary
A distance measurement device controls an emission direction of a laser beam in a light projection device and a reception direction of a laser beam in a light reception device, obtains a reception intensity of the laser beam received by the light reception device, determines whether or not the laser beam received by the light reception device is a laser beam reflected by a target of distance measurement on the basis of a reception direction of the laser beam, a period of time between when the light projection device emits the laser beam and when the light reception device receives the laser beam, a reception intensity of the laser beam, and determination information, and calculates a distance to the target in a case when the laser beam received by the light reception device is the laser beam reflected by the target.