Single-Receiver Multi-Channel LiDAR Module for Multi-Target Detection
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Solution Overview
Problem
Existing lidar sensor modules can only detect one target object on the light source optical axis, requiring multiple modules for comprehensive detection, which increases cost and space occupancy.
Innovation Solution
A multi-channel lidar sensor module with multiple light emitting units and a single light receiving unit, allowing detection of multiple target objects using one sensor by controlling emission periods and adjusting transmittance of reflected laser beams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If one lidar sensor module is used to detect one target object, then the device complexity is low, but the detection coverage is limited and requires multiple modules for comprehensive detection
Solution Approach 1:
The single light receiving unit is segmented into multiple regions (first region and second region) that can independently receive reflected laser beams from different light emitting units. This spatial segmentation allows one sensor module to perform multi-channel detection, achieving comprehensive detection coverage without requiring multiple separate sensor modules.
Solution Approach 2:
The single light receiving unit is designed with multi-functionality to receive reflected laser beams from multiple light emitting units simultaneously. By integrating multiple detection channels into one universal receiving unit, the system achieves comprehensive detection coverage while reducing the total number of sensor modules required.
2Adaptability or versatility
If multiple lidar sensor modules are used to detect multiple target objects, then the detection capability is improved, but the cost and occupied space increase
Solution Approach 1:
Multiple detection channels are merged into a single light receiving unit. The first light emitting unit and second light emitting unit both send their reflected laser beams through the same receiving unit, which separates them by region. This merging reduces the number of separate sensor modules needed, thereby reducing occupied space while maintaining multi-target detection capability.
Solution Approach 2:
The system transitions from a one-dimensional single-channel detection to a multi-dimensional multi-channel detection by utilizing different spatial regions within the same light receiving unit. This dimensional expansion allows multiple target objects to be detected simultaneously without requiring proportionally more physical space.
3Productivity
If multiple light emitting units are used with one light receiving unit, then the multi-channel detection is enabled, but the light amount from different distances may vary
Solution Approach 1:
The optical filter unit dynamically adjusts the transmittance parameter based on the distance to the target object. When the target is at a farther distance, the filter increases transmittance to compensate for light attenuation; when the target is nearby, the filter decreases transmittance to prevent saturation. This parameter adjustment maintains consistent light amounts reaching the image sensor across different detection channels and distances.
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
Enables detection of multiple target objects with reduced costs and space requirements by using a single sensor, maintaining consistent light amounts for accurate measurements across near and far distances.
Implementation Method 1
Light amplification by the stimulated emission of radiation (LASER) causes stimulated emission of light to amplify the light and irradiate a laser
Implementation Method 2
a collimating lens 12 configured to condense and convert the emitted laser beam into a parallel beam
Implementation Method 3
a condensing lens 21 configured to condense and convert a laser beam reflected by an obstacle (target object) A into a parallel beam
Implementation Method 4
A band pass filter 23 is disposed between the condensing lens 21 and the image sensor 22 to transmit only a reflected laser beam in a wavelength range emitted from the light emitting unit 10 and to not transmit beams in other wavelength ranges
Implementation Method 5
an image sensor 22 configured to receive the laser beam condensed by the condensing lens 21
Data Source
AI summary
The present invention relates to a multi-channel lidar sensor module capable of measuring at least two target objects using one image sensor. The multi-channel lidar sensor module according to an embodiment of the present invention includes at least one pair of light emitting units configured to emit laser beams and a light receiving unit formed between the at least one pair of emitting units and configured to receive at least one pair of reflected laser beams which are emitted from the at least one pair of light emitting units and reflected by target objects.