Electrodeless Plasma Lamp Bulb for Continuous Solar UV Simulation
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Solution Overview
Problem
Existing ultraviolet lamps fail to simulate the continuous spectrum of solar ultraviolet rays effectively, leading to insufficient ultraviolet emission efficiency and thermal damage due to high infrared and visible ray proportions, limiting their application in high-power solar ultraviolet simulations.
Innovation Solution
An electrodeless plasma lamp bulb using high-frequency discharge with optimized bulb cover shape, light-emitting materials like mercury, mercury iodide, and sulfur, and a daylight filter to emit a continuous spectrum of solar ultraviolet rays, reducing visible and infrared rays, and incorporating an air-cooled cooling system to maintain stable surface temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional ultraviolet lamps use mercury and arc discharge between electrodes to generate ultraviolet rays, then ultraviolet emission is achieved, but the spectrum is discontinuous and does not match solar ultraviolet rays
Solution Approach 1:
The patent removes electrodes from the traditional arc discharge lamp structure and extracts the harmful discontinuous spectrum characteristics. By using electrodeless plasma discharge with mercury and metal halide compounds, the invention generates a continuous ultraviolet spectrum that closely matches solar radiation, eliminating the need for electrode-based arc discharge that produces discontinuous spectral lines.
Solution Approach 2:
The patent changes the physical and chemical parameters of the light-emitting medium by introducing metal halide compounds (such as sodium iodide, scandium iodide, indium iodide, or thorium iodide) in addition to mercury. This parameter change transforms the discharge characteristics from electrode-based arc discharge to electrodeless plasma discharge, producing a continuous spectrum that spans the ultraviolet range (290-400nm) to match solar ultraviolet radiation.
2Productivity
If high-pressure mercury lamps or metal-halide lamps are used to improve luminous efficiency, then ultraviolet emission efficiency increases, but the proportion of visible and infrared rays becomes too high causing thermal damage
Solution Approach 1:
The patent applies local quality by selectively enhancing ultraviolet emission while suppressing visible and infrared radiation.通过使用电极等等离子体放电方式，配合特定的灯管材料和结构，使灯管在保持高紫外发射效率的同时，有效降低了可见光和红外线的比例，从而减少了热辐射损伤。
Solution Approach 2:
The patent uses composite light-emitting materials consisting of mercury combined with metal halide compounds (sodium iodide, scandium iodide, indium iodide, or thorium iodide). This composite material system produces a spectrum dominated by ultraviolet radiation while minimizing visible and infrared emissions, achieving high ultraviolet efficiency without excessive thermal radiation.
3Power
If xenon-arc lamps or metal-halide lamps are used to achieve high power output, then visible and infrared radiation increases, but ultraviolet ray proportion decreases making them unsuitable for ultraviolet applications
Solution Approach 1:
The patent inverts the conventional approach by using electrodeless plasma discharge with metal halide compounds instead of electrode-based arc discharge. This inversion produces a spectrum where ultraviolet radiation dominates (290-400nm), reversing the typical spectrum distribution where visible and infrared rays predominate in high-power lamps, thus achieving high power output with high ultraviolet proportion.
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 lamp provides high-power, efficient, and long-lasting ultraviolet emission with reduced thermal damage, enabling simultaneous testing of multiple specimens and accelerated photodegradation tests without thermal deformation, matching the solar ultraviolet spectrum for realistic simulation.
Implementation Method 1
electrodeless plasma lamp bulb using high-frequency discharge
Implementation Method 2
ionize light-emitting materials (mercury, mercury iodide, sulfur) and generate a continuous spectrum of ultraviolet rays
Implementation Method 3
applying a daylight filter that blocks short-wavelength ultraviolet rays of 300 nm or less
Implementation Method 4
incorporating an air-cooled cooling system to maintain stable surface temperatures
Data Source
AI summary
A light-emitting plasma lamp bulb for solar ultraviolet simulation includes a bulb cover having a spherical shape or a rod shape through which ultraviolet rays are transmittable, discharge gas contained in the bulb cover, and a first light-emitting material and a second light-emitting material, wherein the first light-emitting material includes at least one of mercury (Hg) and mercury iodide (HgI2), and the second light-emitting material includes sulfur (S8), wherein light emitted from the bulb has a maximum optical power intensity in a range of 395 to 455 nm which is an ultraviolet-visible boundary region, wherein, when compared using a same ultraviolet dose in an ultraviolet region of 290 to 400 nm, an integrated intensity of a visible and infrared region of 400 to 850 nm is equal to or less than ⅕ of an integrated intensity of a visible and infrared region of a standard solar spectrum (ASTM G173, AM 1.5G).