Laser Distance Measurement Synchronization
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Solution Overview
Problem
Laser distance measurement systems, such as LIDAR and LADAR, face calibration challenges due to timing mismatches and are limited by stray light detection, especially at longer distances, restricting their maximum measurable range.
Innovation Solution
A single controller, potentially a field programmable gate array (FPGA), synchronizes the emission of laser pulses with the opening of the detector's window, allowing for variable pulse duration and detection window timing to improve signal-to-noise ratio and extend range by reducing false returns and optimizing detection timing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the detection gate is kept open for a longer time to detect returns from distant objects, then the maximum measurable distance is extended, but stray or random light is more likely to be detected before the laser light
Solution Approach 1:
The system performs preliminary calibration by firing a laser pulse and opening the detector at known reference times to establish baseline timing characteristics. This preliminary action allows the system to compensate for timing mismatches and cable delays before actual distance measurements, enabling accurate detection at extended ranges without stray light interference
Solution Approach 2:
The system dynamically adjusts the detection gate timing parameters based on the measured time of flight. By calculating the round-trip time and applying calibration offsets, the detector window is precisely positioned to open only when the return pulse is expected, extending the maximum measurable distance while maintaining rejection of stray light through parameter optimization
2Device complexity
If traditional separate control systems are used for laser emission and detector operation, then system complexity is reduced, but timing precision and calibration accuracy deteriorate due to synchronization mismatches
Solution Approach 1:
The patent merges the control functions for laser pulse emission and detector operation into a single integrated controller. This consolidation ensures that the timing signals for both components originate from the same clock reference and control logic, eliminating synchronization mismatches while maintaining manageable system complexity through functional integration
3Measurement precision
If calibration is performed to correct timing mismatches between laser firing and detector opening, then measurement accuracy is improved, but additional calibration time and system complexity are required
Solution Approach 1:
The system performs calibration periodically rather than continuously, establishing timing reference points at known intervals. This periodic calibration approach maintains high measurement accuracy by correcting for drift and mismatches only when necessary, reducing the time loss associated with calibration while preserving measurement precision during operational phases
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 solution enhances the accuracy and range of laser distance measurements, reduces calibration issues, and increases the signal-to-noise ratio, enabling more precise and extended distance measurements with less laser energy.
Implementation Method 1
determining total time of travel for the laser pulse, and calculating a distance measurement based on the time of travel of the laser pulse
Data Source
AI summary
A method of laser distance measurement includes issuing a command from a single controller to a laser pulse emitter to emit a laser pulse. The method includes issuing a command from the single controller to a laser pulse detector to open for detection of a return of the laser pulse. The method includes detecting a return of the laser pulse, determining total time of travel for the laser pulse, and calculating a distance measurement based on the time of travel of the laser pulse.