Laser Radar Focus Control via Wavelength Switching
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Solution Overview
Problem
Laser radar devices require high accuracy in adjusting lens positions to control focus distance, leading to increased size and weight due to mechanical driving mechanisms.
Innovation Solution
A laser radar device using multiple laser light sources with different wavelengths, a modulator, and processing circuitry to dynamically control focus distance by switching emission directions and adjusting wavelengths, eliminating the need for mechanical lens adjustment mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a driving mechanism is used to mechanically adjust lens positions to control focus distance, then focus distance control is achieved, but the size and weight of the optical antenna increase
Solution Approach 1:
The patent replaces the mechanical lens adjustment system with an optical solution using multiple fixed lenses and wavelength switching. Instead of moving lenses mechanically, the system uses lenses with different focal lengths that are fixed in position, and switches between them by changing the wavelength of incident light, thereby eliminating the need for heavy driving mechanisms while maintaining focus distance control capability
Solution Approach 2:
The patent changes the wavelength parameter of the incident light to control which lens is activated. By varying the wavelength, the system selects different lenses from the plurality of fixed lenses, each having different focal lengths, thereby achieving dynamic focus distance adjustment without mechanical movement of the lenses themselves
2Measurement precision
If a driving mechanism is used to mechanically adjust lens positions to control focus distance, then focus distance control is achieved, but the size of the optical antenna increases
Solution Approach 1:
The patent replaces the mechanical lens adjustment system with an optical solution using multiple fixed lenses and wavelength switching. Instead of moving lenses mechanically, the system uses lenses with different focal lengths that are fixed in position, and switches between them by changing the wavelength of incident light, thereby eliminating the need for heavy driving mechanisms while maintaining focus distance control capability
Solution Approach 2:
The patent divides the optical system into multiple fixed lens elements, each with a specific focal length, arranged in a segmented manner. Rather than one movable lens, the system has multiple stationary lenses that are selectively activated, reducing the need for large mechanical adjustment spaces and simplifying the overall optical antenna structure
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 precise and dynamic control of focus distance without mechanical mechanisms, reducing the size and weight of the optical antenna while maintaining focus position accuracy.
Implementation Method 1
the optical antennas emit the beams of oscillation light modulated by the modulator as beams of transmission light that focus at a position distanced by a focus distance
Implementation Method 2
measures the moving speed of the object on the basis of a result of measurement of Doppler shift of the received oscillation light
Data Source
AI summary
A laser radar device performs control to make a focus distance of transmission light equal to a measurement distance by switching a plurality of laser light sources that emit beams of oscillation light having wavelengths different from each other to switch emission directions of the transmission light while maintaining the focus position of optical antennas, and changing the wavelength of the beams of oscillation light according to the measurement distance.