Laser Radar Optical Axis Correction for High-Speed Wind Scanning
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Solution Overview
Problem
Conventional laser radar apparatuses face a decrease in wind speed measurement rate due to angular deviations between optical axes during high-speed beam scanning, leading to reduced reception signal intensity and limited measurable wind distance.
Innovation Solution
A laser radar apparatus with a scanner, wind meter, optical axis angular correction system, and measurable wind distance calculator that adjusts optical axis alignment to maintain maximum measurable wind distance during high-speed scanning by deriving and applying optical axis angular correction amounts based on wind measurement data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If beam scanning is performed at high angular speed to increase wind speed measurement rate, then productivity is improved, but the angular deviation between optical axes increases causing reception signal intensity to decrease
Solution Approach 1:
The optical axis corrector dynamically adjusts the reception optical axis in real-time to track and compensate for the angular deviation caused by high-speed beam scanning. This dynamic correction maintains optimal alignment between transmitted and received light paths, preserving reception signal intensity while enabling high-speed scanning operation.
Solution Approach 2:
The system uses feedback from the measurable wind distance calculator to monitor reception signal quality and adjusts the optical axis correction amount accordingly. This closed-loop control ensures that the optical axis alignment is continuously optimized to maintain maximum measurable wind distance despite high-speed scanning conditions.
2Measurement precision
If optical axis angular deviation is corrected to maintain reception signal intensity, then measurement precision is improved, but the distance capable of measuring wind decreases when beam scanning is not performed
Solution Approach 1:
The system changes the optical axis correction parameter dynamically based on the beam scanning state. When high-speed scanning is performed, a larger correction amount is applied to compensate for angular deviation. When scanning is not performed or at low speed, the correction amount is reduced or eliminated, preventing the measurable wind distance from decreasing while maintaining reception signal quality during active scanning.
3Productivity
If beam scanning rate is increased to improve wind speed measurement rate, then productivity is improved, but the angular deviation between optical axes increases leading to loss of reception signal
Solution Approach 1:
The optical axis corrector operates dynamically at the same high speed as the beam scanning, continuously adjusting the reception optical path to track the transmitted beam position. This dynamic tracking prevents signal power loss by ensuring that the reception system remains aligned with the transmitted light even during high-speed scanning operations.
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 continuous wind speed measurement at the largest possible distance during high-speed beam scanning, regardless of changes in reception signal intensity, by optimizing optical axis alignment in real-time.
Implementation Method 1
Single-wavelength continuous light that is local light of the transmitted light is heterodyned with the reception light to determine the Doppler shift caused by movement of the aerosol and measure the wind speed
Implementation Method 2
an optical axis corrector configured to correct an optical axis angular deviation between the transmitted light and the reception light
Implementation Method 3
Single-wavelength continuous light that is local light of the transmitted light is heterodyned with the reception light to determine the Doppler shift
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A laser radar apparatus in the present disclosure includes: a scanner 60 capable of beam scanning at a first angular speed; a measurable wind distance calculator monitor 30 to calculate and to monitor a measurable wind distance based on wind measurement data obtained through beam scanning by the scanner; an optical axis angular correction amount deriver 40 to derive an optical axis angular correction amount being able to obtain the largest distance of the measurable wind distance, based on a first angular speed and the wind measurement data obtained through beam scanning at a second angular speed lower than the first angular speed, when decrease of the measurable wind distance is detected by the measurable wind distance calculator monitor; and an optical axis corrector 8 to correct an optical axis angular deviation between transmitted light and reception light, based on the optical axis angular correction amount.