LiDAR Sensor Device Wavelength Segmentation Noise Reduction
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Solution Overview
Problem
LiDAR sensor devices face challenges in distinguishing between echo signals reflected from objects and light emitted by other systems, particularly when using lasers of the same wavelength, leading to increased noise signals and difficulties in signal interpretation.
Innovation Solution
The LiDAR sensor device employs a dual-emitter system with first and second emitters emitting pulsed light of different wavelengths, along with optical bandpass filters to selectively allow specific wavelengths to pass, enhancing signal identification and noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If multiple LiDAR systems use lasers of the same wavelength, then the systems can operate with standardized components, but the ability to distinguish between echo signals and light from other systems deteriorates
Solution Approach 1:
The patent segments the optical spectrum by using multiple laser emitters that emit at different wavelengths. This allows the system to divide the measurement task across multiple wavelength channels, enabling clear identification of echo signals from specific lasers even when multiple LiDAR systems operate in the same environment.
Solution Approach 2:
The patent changes the wavelength parameter of the laser emission by employing multiple lasers with distinct wavelengths (e.g., 905 nm, 1550 nm). This parameter differentiation allows receivers to distinguish between signals from different LiDAR systems through wavelength-selective filtering, resolving the contradiction between standardization and signal identification.
2Measurement precision
If LiDAR systems emit light at multiple wavelengths, then the signal-to-noise ratio improves, but the device complexity increases
Solution Approach 1:
The patent merges multiple laser emitters and their corresponding bandpass filters into a single integrated LiDAR system. By combining these components that operate at different wavelengths, the system achieves improved signal-to-noise ratio through wavelength diversity while managing the overall device complexity through integration.
Solution Approach 2:
The patent creates a multi-functional LiDAR system where a single device can operate at multiple wavelengths simultaneously. Each wavelength channel serves the universal function of distance measurement, but with enhanced capability to distinguish signals in multi-system environments, making the system more versatile without proportionally increasing complexity.
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
This configuration allows for clear identification of echo signals and improves the signal-to-noise ratio, enabling more accurate interpretation of the measured signals and better performance in real-world scenarios.
Implementation Method 1
a first and at least one second optical bandpass filter, in particular a narrowband optical bandpass filter, with the first and the at least one second optical bandpass filter being arranged between the object and the at least one photodetector. The first bandpass filter is configured to allow substantially light of the first wavelength and the at least one second bandpass filter is configured to allow substantially light of the at least one second wavelength to pass
Implementation Method 2
a detection or receiver unit with an image sensor, in particular a photodetector, for detecting the radiation reflected back from the object space
Implementation Method 3
the first emitter is configured to emit pulsed light of a first wavelength and the at least one second emitter is configured to emit pulsed light of at least a second wavelength
Data Source
AI summary
A LIDAR sensor device includes a first laser emitter configured to emit pulsed light of a first wavelength and at least one second laser emitter configured to emit pulsed light of at least a second wave-length different from the first wavelength, in the direction of an object located in front of the laser emitters respectively. Furthermore, the sensor device includes a receiving unit including at least one photodetector, as well as a first and at least one second optical bandpass filter, in particular a narrowband optical bandpass filter, wherein the first and the at least one second optical bandpass filter are arranged between the object and the at least one photodetector, and wherein the first bandpass filter is configured to allow substantially light of the first wavelength to pass and the at least one second band-pass filter is configured to allow substantially light of the at least one second wavelength to pass.