Lidar Bandpass Filter Spectral Width and Temperature Control
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Solution Overview
Problem
Current LIDAR systems face challenges in maintaining a high signal-to-noise ratio due to the wide spectral emission width of semiconductor lasers, which requires a broader bandpass filter, increasing the influence of background light and complicating temperature stabilization.
Innovation Solution
A LIDAR system with a bandpass filter having a narrower spectral transmission width than the light source's emission width, combined with a temperature stabilization unit using heating or Peltier elements to maintain central wavelength alignment between the light source and bandpass filter, and optionally incorporating a rotatable mirror or platform for beam deflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a broader bandpass filter is used to capture laser radiation within tolerances, then the laser radiation transmission is improved, but the background light influence increases
Solution Approach 1:
The patent changes the spectral transmission width parameter of the bandpass filter to be narrower than the spectral emission width of the laser source. This parameter change allows the filter to reject background light more effectively while still transmitting the laser radiation, resolving the contradiction between reliability and harmful factors.
2Object-affected harmful factors
If a narrower bandpass filter is used to reduce background light influence, then the signal-to-noise ratio is improved, but the laser radiation transmission decreases
Solution Approach 1:
The patent sets the spectral transmission width parameter of the bandpass filter to a specific range (5-95% of the laser source's spectral emission width) that optimizes both background light rejection and laser radiation transmission, resolving the contradiction between harmful factors and reliability.
3Stability of the object's composition
If temperature control is implemented to stabilize wavelength, then the wavelength drift is reduced, but the device complexity increases
Solution Approach 1:
The patent implements dynamic temperature control using heating elements or Peltier elements to compensate for temperature-induced wavelength drift. This dynamic adjustment maintains wavelength stability without requiring complex fixed systems, resolving the contradiction between stability and complexity.
4Measurement precision
If the spectral transmission width is set to a specific percentage of the emission width, then the signal quality is optimized, but the optical signal power is curtailed
Solution Approach 1:
The patent optimizes the spectral transmission width parameter to a specific range (5-95% of spectral emission width) that balances signal quality optimization with acceptable optical signal power transmission, resolving the contradiction between measurement precision and energy loss.
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 reduces the impact of background light while allowing for efficient use of simpler, cost-effective laser sources and maintaining signal quality across varying temperatures, without the need for extensive structural changes to the light source.
Implementation Method 1
Optical bandpass filters, preferably interference filters, are used in the reception path in present LIDAR systems to improve a signal-to-noise ratio in that background light is filtered out, and the useful radiation, in general laser radiation, is transmitted.
Implementation Method 2
The temperature control may be implemented, for example, by heating elements or by Peltier elements.
Implementation Method 3
The temperature control may be implemented, for example, by heating elements or by Peltier elements.
Implementation Method 4
a reception path configured to receive light emitted by the light source, which was reflected in surroundings of the LIDAR system
Implementation Method 5
light emitted by the light source, which was reflected in surroundings of the LIDAR system
Data Source
AI summary
A LIDAR system. The LIDAR system includes a light source and a bandpass filter which is situated in a reception path of the LIDAR system. The reception path being configured to receive light emitted by the light source which was reflected in surroundings of the LIDAR system. A spectral transmission width of the bandpass filter is configured to be narrower than a spectral emission width of a light beam emitted by the light source. A vehicle, which includes a LIDAR system, is also provided.