Multiphase LiDAR Transmitter Array for Narrower Laser Pulses
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Solution Overview
Problem
Laser detection apparatuses face challenges with low accuracy in distance measurement due to simple waveforms of transmitted laser signals and high transmit power leading to large pulse widths, which are exacerbated by parasitic parameters.
Innovation Solution
Implementing a multiphase signal generation circuit to generate electrical signals with varying phases, amplified by an amplifier array, driving a laser transmitter array to transmit laser signals with reduced power and improved anti-interference performance, thereby reducing pulse widths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high transmit power is used by the laser transmitter, then the laser signal can be transmitted effectively, but the transmit pulse width becomes large due to parasitic parameters
Solution Approach 1:
The patent divides a single high-power laser transmitter into multiple low-power laser transmitters (e.g., 4 transmitters). Each transmitter operates at lower power, avoiding the parasitic parameter issues that cause pulse width expansion. The multiple transmitters work simultaneously to achieve the required total transmit power while maintaining narrow pulse widths.
2Ease of manufacture
If a simple waveform is used for the laser signal, then the system is easier to implement, but the signal-to-noise ratio becomes insufficient for reliable detection
Solution Approach 1:
The patent employs periodic pulse modulation where multiple laser transmitters emit laser signals in periodic cycles with specific timing relationships. This periodic action creates a structured signal pattern that enhances the signal-to-noise ratio through coherent integration during detection, while maintaining relatively simple individual waveform structures.
Solution Approach 2:
The patent combines the outputs of multiple laser transmitters to create a composite laser signal. By merging the signals from multiple low-power transmitters that operate with coordinated phases and timing, the system achieves both improved signal-to-noise ratio through constructive interference and maintains ease of implementation using standard laser components.
3Duration of action of moving object
If multiple laser transmitters are used to reduce transmit power and pulse width, then the transmit pulse width is reduced, but the device complexity increases
Solution Approach 1:
The system segments the laser transmission function into multiple identical or similar transmitter units. Each unit has the same simple structure and control logic, which simplifies individual component design and manufacturing. The overall system complexity is managed through modular architecture where identical modules can be replicated and integrated using standardized interfaces.
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
Enhances the accuracy of distance detection by improving anti-interference performance and reducing transmit pulse widths through the use of a multiphase signal generation and laser transmitter array configuration.
Implementation Method 1
The multiphase signal generation circuit is configured to generate a plurality of target electrical signals with different phases
Implementation Method 2
Each of the plurality of first amplifiers is configured to amplify a target electrical signal output by the corresponding output end of the multiphase signal generation circuit
Implementation Method 3
Each of the plurality of laser transmitters is configured to transmit a first laser signal based on a target electrical signal amplified by the corresponding first amplifier
Implementation Method 4
the laser detector may detect a reflected signal, convert the reflected signal into an electrical signal, and output the electrical signal
Data Source
AI summary
This application discloses a laser detection apparatus, a method for manufacturing the laser detection apparatus, and a terminal, and belongs to the field of laser detection technologies, for example, light detection and ranging (Lidar). The apparatus includes a multiphase signal generation circuit, an amplifier array, and a laser transmitter array. The amplifier array includes a plurality of first amplifiers, and the laser transmitter array includes a plurality of laser transmitters. A plurality of output ends of the multiphase signal generation circuit are connected to input ends of corresponding first amplifiers, and output ends of the plurality of first amplifiers are connected to corresponding laser transmitters.