Dynamic Filter for LIDAR Incidence Angle Compensation
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Solution Overview
Problem
Current LIDAR devices face limitations in signal quality due to the shifting transmission window of filters at varying incidence angles, which affects the detection of objects at greater distances and angles, particularly due to the narrowing of spectral bandwidth towards smaller wavelengths.
Innovation Solution
A LIDAR device with a dynamically adaptable filter, such as a rotatable dielectric filter or a Fabry-Pérot cavity, that adjusts its transmission range and refractive index to compensate for incidence angle-dependent wavelength shifts, ensuring optimal signal transmission across a wide scanning angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a narrow spectral bandwidth filter is used to improve signal quality, then stray light rejection is improved, but transmission at greater incidence angles deteriorates due to wavelength shift
Solution Approach 1:
The patent applies a dynamic filter whose transmission characteristics can be changed during operation. Specifically, the filter's spectral bandwidth or central wavelength is dynamically adjusted based on the detected incidence angle of incoming radiation, allowing the system to maintain optimal signal quality across varying scanning angles while rejecting stray light effectively.
Solution Approach 2:
The patent changes the optical parameters of the filter (such as spectral bandwidth or central wavelength) in response to varying incidence angles. By detecting the incidence angle and相应地 adjusting the filter parameters, the system compensates for the wavelength shift that occurs at different angles, thereby maintaining consistent transmission performance across the entire scanning range.
2Adaptability or versatility
If a wide spectral bandwidth filter is used to maintain transmission at greater incidence angles, then adaptability is improved, but signal quality deteriorates due to increased stray light
Solution Approach 1:
The patent employs a dynamic filter that adjusts its spectral characteristics based on real-time detection of incidence angles. When the incidence angle is small, the filter operates with narrow bandwidth for high signal quality; when the incidence angle increases, the filter dynamically shifts its transmission window or broadens bandwidth to maintain adequate transmission, thus resolving the contradiction between signal quality and angular adaptability.
Solution Approach 2:
The filter's transmission parameters (central wavelength and/or bandwidth) are dynamically changed according to the incidence angle. This parameter adaptation allows the system to optimize the balance between signal quality and transmission efficiency at each scanning angle, preventing the harmful effects of both excessive narrowband filtering and excessive broadband filtering.
3Adaptability or versatility
If the filter transmission window is shifted toward smaller wavelengths to compensate for incidence angle effects, then transmission at greater angles is improved, but the physical limit of filter shifting is reached
Solution Approach 1:
The patent replaces mechanical filter adjustment mechanisms with an optical detection and control system. An incidence angle detector optically detects the scanning angle and generates control signals that automatically adjust the filter parameters, eliminating the need for complex mechanical shifting mechanisms and reducing overall device complexity while achieving the desired transmission compensation.
Solution Approach 2:
The patent introduces an intermediary control system that optically detects incidence angles and translates them into appropriate filter adjustments. This intermediary layer (comprising optical detectors and control circuitry) mediates between the physical phenomenon of wavelength shift and the filter's transmission characteristics, enabling automatic compensation without direct mechanical intervention.
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 maintains high signal quality and detection accuracy by dynamically adjusting the filter's orientation and properties to align the incoming beam's wavelength with the optimal transmission range, even at greater incidence angles, thereby enhancing the device's range and scanning capabilities.
Implementation Method 1
at least one filter, the at least one filter being adaptable to the at least one incoming electromagnetic beam
Implementation Method 2
the shifting of the transmission window of the filter, which is dependent on the incidence angle, is a physical limit of LIDAR devices
Data Source
AI summary
A LIDAR device for scanning a scanning angle, including at least one radiation source for generating at least one electromagnetic beam, including a rotatable mirror for deflecting the at least one electromagnetic beam along the scanning angle, including a receiving unit for receiving at least one incoming electromagnetic beam and for deflecting the at least one incoming electromagnetic beam to at least one detector, and including at least one filter, the at least one filter being adaptable to the at least one incoming electromagnetic beam. Moreover, a method for scanning a scanning angle with the aid of such a LIDAR device is described.