Lidar Scanning Module With Embedded Transmit Lens
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Solution Overview
Problem
Current distance measurement systems for autonomous driving vehicles have low scanning frequency due to heavy and large optoelectronic devices mounted on turntables with high power consumption, leading to reduced measurement precision and increased risk of collisions.
Innovation Solution
A distance measurement system with a scanning module and a separate distance measurement module, where the transmit lens is embedded within the receive lens, allowing for off-axis optical paths and reduced weight, enabling rapid rotation of the scanning module and minimizing the size and power consumption, thus improving scanning efficiency and precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the optoelectronic device is mounted on the turntable, then the distance measurement function is achieved, but the weight of the rotating part increases and scanning frequency decreases
Solution Approach 1:
The system is divided into two independent modules: the scanning module (turntable with lens group) and the distance measurement module (laser transmitter and receiver). By separating the heavy distance measurement module from the rotating scanning module, the weight of the rotating part is reduced, enabling faster scanning while maintaining measurement precision through the fixed module.
Solution Approach 2:
The distance measurement module (laser transmitter and receiver) is extracted from the rotating turntable and fixed to the vehicle body. Only the lightweight lens group remains on the turntable, significantly reducing the moment of inertia and allowing rapid rotation for high-frequency scanning while the measurement function is maintained by the fixed module.
2Measurement precision
If the optoelectronic device is mounted on the turntable, then the distance measurement function is achieved, but the power consumption increases and scanning speed decreases
Solution Approach 1:
The system separates power-consuming components (laser transmitter and receiver) from the rotating scanning module. The lightweight lens group on the turntable requires minimal power, while the fixed distance measurement module handles all power-intensive operations, reducing overall system power consumption and enabling faster scanning.
3Device complexity
If the transmit lens and receive lens are arranged coaxially, then the optical path is simplified, but the focal lengths cannot be independently adjusted
Solution Approach 1:
The patent employs asymmetric optical design by separating the transmit and receive optical paths. The transmit lens and receive lens are positioned at different locations with different focal lengths, allowing independent optimization of transmission and reception characteristics. This asymmetric arrangement enables flexible adjustment of focal lengths while maintaining a relatively simple overall optical path through separate light sources and detectors.
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 enhances scanning efficiency and precision, enabling the system to rapidly measure distances and prevent collisions by reducing the weight and power consumption of the scanning module, while also simplifying electrical connections and facilitating miniaturization.
Implementation Method 1
The transmit lens is configured to transmit laser light to the scanning module
Implementation Method 2
the receive lens is configured to receive reflected light of the measured object transmitted by the scanning module
Implementation Method 3
the lens group is further configured to receive reflected light of a measured object in an environment of the distance measurement system, and transmit the reflected light to the distance measurement module
Data Source
AI summary
A distance measurement system and a vehicle are provided. The distance measurement system includes a scanning module and a distance measurement module. The distance measurement module is configured to: emit laser light to the scanning module, and receive reflected light transmitted by the scanning module. The scanning module includes a moving component and a lens group. The moving component is configured to drive the lens group to perform scanning. The lens group is further configured to: receive reflected light of a measured object in an environment of the distance measurement system, and transmit the reflected light to the distance measurement module.