UV LED Exhaust Plume Simulator for Detector Testing
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Solution Overview
Problem
Current plume simulators using incandescent lamps are inefficient, have a high failure rate, and poor modulation capabilities, making them unsuitable for simulating vehicle exhaust plumes for testing ultraviolet light detectors effectively.
Innovation Solution
A light emission system utilizing ultraviolet light emitting diodes (LEDs) with a controller to modulate the intensity and pattern of the ultraviolet light, simulating the radiation pattern of a vehicle exhaust plume, allowing for precise simulation of rocket or missile plumes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If incandescent lamps are used to simulate exhaust plume, then ultraviolet light can be provided, but efficiency is poor and failure rate is high
Solution Approach 1:
The patent changes the fundamental operating parameters of the light source from thermal incandescence to electroluminescence in LEDs. This parameter change enables direct electrical-to-optical energy conversion with much higher efficiency and reliability, eliminating the thermal inefficiencies and filament failure modes of incandescent lamps while maintaining ultraviolet light output for plume simulation.
Solution Approach 2:
The patent replaces the mechanical/thermal system of incandescent lamps with an electronic/optical system using LEDs. This substitution eliminates moving parts, thermal stress, and filament mechanics that cause failures, while providing solid-state reliability and efficient energy conversion for sustained plume simulation operation.
2Ease of operation
If incandescent lamps are used to simulate exhaust plume, then ultraviolet light can be provided, but modulation rate is poor
Solution Approach 1:
The patent employs periodic electrical signaling to modulate LED output at high rates, enabling precise simulation of pulsating plume characteristics. The LED's fast response to electrical modulation allows accurate reproduction of transient plume behavior that incandescent lamps cannot achieve due to thermal inertia.
Solution Approach 2:
The patent implements dynamic control of light output through electronic modulation of LED current. This enables real-time adjustment of intensity and temporal patterns to match varying plume conditions, providing operational flexibility and consistency that static thermal systems cannot achieve.
3Measurement precision
If live rockets or missiles are fired for testing, then realistic plume data can be obtained, but it is not economically practical
Solution Approach 1:
The patent creates a simplified optical copy of the exhaust plume's ultraviolet radiation characteristics using LEDs. This copy reproduces the essential detection signature without requiring actual propellant combustion, enabling repeated testing at low cost while maintaining measurement precision for detector validation and calibration.
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 LED-based system provides a more efficient and reliable simulation of ultraviolet light patterns, enabling effective testing of detectors without the need for live rocket or missile firings, improving detection accuracy and reducing operational costs.
Implementation Method 1
a light source that comprises at least one light emitting diode (LED) that provides ultraviolet light
Data Source
AI summary
A light emission system that comprises a light source that comprises at least one light emitting diode (LED) that provides ultraviolet light. The system also comprises a controller that controls the intensity of the ultraviolet light provided by the light source such that the ultraviolet light provided by the light source simulates a vehicle exhaust plume.