Laser Particle Sensor Eye Safety via Dynamic Power Control
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Solution Overview
Problem
Laser-based particle sensors pose a safety concern due to the potential for eye exposure to optical energies exceeding permissible exposure levels, necessitating the development of techniques that address eye safety requirements for certification in aircraft and other vehicles.
Innovation Solution
The system incorporates a laser particle sensor mounted and operated in configurations that direct laser light beams away from human-occupied areas or attenuate them, using light absorbent materials and adjusting power modes based on vehicle operating parameters to minimize exposure risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If laser beams are used for long-distance particle detection, then detection capability is improved, but eye safety is compromised due to excessive optical energy exposure
Solution Approach 1:
The laser particle sensor dynamically adjusts its power mode (normal or low) based on real-time vehicle operating parameters such as altitude, geographic location, and velocity. This dynamic adaptation allows the sensor to maintain optimal detection capability when safe to do so, while automatically reducing power to prevent eye exposure hazards during ground operations or low-altitude flight, thus resolving the contradiction between detection performance and eye safety
Solution Approach 2:
The system changes the power parameter of the laser beam based on operating conditions. During ground operations or when below threshold altitude, the laser operates in low power mode with reduced optical energy. At higher altitudes where eye exposure risk is minimized, the laser switches to normal power mode for full detection capability, effectively managing the trade-off between measurement precision and harmful exposure
2Object-affected harmful factors
If laser power is reduced to ensure eye safety, then safety is improved, but detection capability deteriorates
Solution Approach 1:
The sensor dynamically switches between normal and low power modes based on real-time assessment of operating parameters. When the vehicle is on the ground or at low altitude where personnel may be exposed, the system automatically reduces laser power to ensure eye safety. When operating at high altitudes where exposure risk is eliminated, the system restores full power to maintain optimal particle detection capability, thus dynamically balancing safety and performance
3Measurement precision
If laser beams are directed toward measurement regions, then particle detection is improved, but exposure to populated areas increases
Solution Approach 1:
The system applies different power levels to different spatial contexts. The laser beam is directed toward the measurement region containing particles, but the power transmitted is locally adjusted based on the presence or absence of populated areas in the beam path. When ground personnel or aircraft are detected in potential exposure zones, the system reduces power in those specific directions while maintaining detection capability in safe zones, achieving spatially differentiated safety management
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 solution effectively reduces the likelihood of eye exposure to harmful optical energies, ensuring safe operation of laser particle sensors by directing beams away from populated zones and reducing power during high-risk situations, thereby addressing eye safety concerns and facilitating certification.
Implementation Method 1
The laser particle sensor includes a laser transceiver configured to transmit at least one laser light beam
Implementation Method 2
characterizes the backscattered light in at least one measurement region
Data Source
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AI summary
In one embodiment, a laser particle sensor (102) on or in a vehicle is provided. The laser particle sensor comprises an optical system (103); a processing system (116) coupled to the optical system; wherein the optical system is configured to transmit one or more laser light beams (112) to detect particles in a volume of freestream fluid (114), and to have the one or more light beams terminate on a portion of the vehicle on which the optical system is mounted; and wherein the optical system is configured to receive a backscattered portion of the one or more laser light beams transmitted by the optical system.