LiDAR Distance Measuring Device With Variable Emission Frequency
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Solution Overview
Problem
Existing distance measuring devices using LiDAR struggle to increase detectable distance while adhering to safety standards for laser beam intensity and emission frequency, as higher intensities or frequencies can violate safety regulations.
Innovation Solution
A distance measuring device with a light projection unit emitting laser beams in a two-dimensional manner, utilizing multiple light source units with varying emission frequencies and controlled by a unit that ensures compliance with safety standards, allowing for increased intensity in specific regions to enhance detectable distance without exceeding safety limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the light intensity of the laser beam is increased or the number of times of emission of the laser beam is increased, then the S/N ratio is improved and the detectable distance is increased, but the laser beam safety standard may not be satisfied
Solution Approach 1:
The patent applies local quality by making different light source units emit different numbers of laser beams per unit time based on their spatial positions. Specifically, light source units in regions requiring longer detection distances emit more frequently, while units in regions closer to the target emit less frequently. This spatially differentiated emission strategy optimizes the S/N ratio locally without uniformly exceeding safety standards across all regions.
Solution Approach 2:
The patent changes the emission frequency parameter of laser beams based on spatial position and detection requirements. By dynamically adjusting the number of emissions per unit time for different light source units, the system optimizes detection performance while maintaining compliance with safety standards. The control unit manages these parameter changes to ensure that increased emission frequency in specific regions does not violate overall safety constraints.
2Measurement precision
If the light intensity of the laser beam is increased, then the S/N ratio is improved, but the laser beam safety standard may not be satisfied
Solution Approach 1:
The patent implements local quality by varying the emission frequency of individual light source units based on their specific spatial positions and detection needs. Instead of uniformly increasing light intensity across all sources, the system selectively increases emissions only from units positioned in regions where longer detection distances are required, thereby improving S/N ratio locally without triggering safety violations system-wide.
Solution Approach 2:
The patent adjusts the emission frequency parameter dynamically for different light source units. The control unit monitors and manages the emission parameters of each unit, increasing the number of emissions per unit time only where necessary to improve S/N ratio, while keeping emissions from other units at lower frequencies to maintain overall compliance with laser safety standards.
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 effectively increases the detectable distance while ensuring compliance with laser safety standards by strategically varying the emission frequencies of light source units, thereby improving signal-to-noise ratio and enabling more accurate long-distance measurements.
Implementation Method 1
a light projection unit configured to emit light in a two-dimensional manner
Implementation Method 2
a light receiving unit including a plurality of light receiving elements arranged in a two-dimensional direction
Implementation Method 3
a distance measuring unit configured to measure a distance to the object by a time difference between time at which the light projection unit emits the light and time at which the light emitted from the light projection unit is reflected by the object and received by the light receiving unit
Data Source
AI summary
To increase a detectable distance while satisfying a safety standard of laser beam. A distance measuring device includes a light projection unit that emits light in a two-dimensional manner, a light receiving unit including a plurality of light receiving elements arranged in a two-dimensional direction, and a control unit that controls whether or not to perform light reception by the plurality of light receiving elements. The light projection unit includes a plurality of light source units, and the plurality of light source units includes two or more light source units having different numbers of times of emission per unit time from each other.