Lidar Light-Receiving Device With Variable Spectral Resolution
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Solution Overview
Problem
Lidar systems face measurement errors due to coincidence loss and crosstalk in array detectors, particularly when analyzing Raman spectra, which affect the accuracy of photon flux density and signal values.
Innovation Solution
A light-receiving device for lidar that includes an optical element to adjust wavelength resolution, such as an aspheric lens, to equalize intensity differences in dispersed light, reducing the impact of coincidence loss and crosstalk on measurement results.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If an array detector is used to analyze the spectrum of received light, then spectral analysis capability is improved, but measurement accuracy deteriorates due to coincidence loss and crosstalk between adjacent channels
Solution Approach 1:
The patent applies local quality by making the wavelength resolution variable across different regions of the spectrum. The optical element is designed to provide higher wavelength resolution for light with relatively high intensity and lower wavelength resolution for light with relatively low intensity. This non-uniform resolution distribution optimizes the detection performance for different spectral regions, reducing coincidence loss in high-intensity regions while maintaining adequate resolution in low-intensity regions, thereby improving overall measurement accuracy while preserving spectral analysis capability.
2Device complexity
If uniform wavelength resolution is applied across all spectral regions, then spectral analysis is simplified, but measurement accuracy deteriorates due to large intensity differences causing coincidence loss and crosstalk
Solution Approach 1:
The patent implements local quality by designing an optical element that creates non-uniform wavelength resolution across the spectral range. The optical element includes a first region with higher wavelength resolution for high-intensity light and a second region with lower wavelength resolution for low-intensity light. This approach balances the photon flux density across detection channels, reducing coincidence loss and crosstalk effects, thereby improving measurement accuracy without requiring overly complex spectral analysis procedures.
Solution Approach 2:
The patent applies parameter changes by varying the wavelength resolution parameter across different spectral regions. The optical element is designed with different optical characteristics in different regions, causing the wavelength resolution to change as a function of position in the spectral range. This parameter variation allows the system to adapt to the intensity distribution of the input light, optimizing measurement accuracy by reducing intensity differences between channels while maintaining manageable spectral analysis complexity.
3Measurement precision
If higher wavelength resolution is applied to all light, then spectral analysis precision is improved, but intensity differences between channels increase, worsening coincidence loss and crosstalk
Solution Approach 1:
The patent applies local quality by implementing spatially varying wavelength resolution through the optical element. The optical element is designed with a first region that provides higher wavelength resolution for light with relatively high intensity and a second region that provides lower wavelength resolution for light with relatively low intensity. This local differentiation balances the photon flux density across detection channels, reducing coincidence loss and crosstalk, thereby improving measurement reliability while maintaining adequate spectral analysis precision where needed.
Solution Approach 2:
The patent implements parameter changes by making the wavelength resolution a variable parameter rather than a constant. The optical element is designed to change the wavelength resolution parameter as a function of position in the spectral range, with higher resolution in regions corresponding to high-intensity light and lower resolution in regions corresponding to low-intensity light. This dynamic parameter adjustment optimizes the balance between spectral analysis precision and measurement reliability by reducing intensity differences between channels.
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 device minimizes the effects of coincidence loss and crosstalk, enabling more accurate analysis of Raman spectra and improving measurement precision in lidar systems.
Implementation Method 1
a spectroscopic element that disperses received light to produce wavelength-dispersed light in one axial direction
Implementation Method 2
an optical element that sets a wavelength resolution, with respect to a wavelength dispersion axis direction of light, within the dispersed light, having relatively high intensity to be higher than the wavelength resolution, with respect to the wavelength dispersion axis direction, of light having relatively low intensity
Data Source
AI summary
The present invention provides a light-receiving device for a lidar that reduces the effects of coincidence loss and crosstalk on measurement results. The present invention provides a light-receiving device for a lidar that detects scattered laser light, the light-receiving device for a lidar including a spectroscopic element that disperses received light to produce wavelength-dispersed light in one axial direction, an optical element that sets a wavelength resolution, with respect to a wavelength dispersion axis direction of the dispersed light, of light having relatively high intensity, within the dispersed light, to be higher than the wavelength resolution, with respect to the wavelength dispersion axis direction of the dispersed light, of light having relatively low intensity, and an array detector that detects the light whose a spectrum has been changed by the optical element.