Dual-Wavelength Inspection Light With Smooth Intensity Transitions
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Solution Overview
Problem
Conventional lamps used for inspecting workpiece surfaces under ultraviolet and white light illumination cause significant eye strain due to abrupt changes in brightness when switching between light sources, which is uncomfortable and potentially harmful.
Innovation Solution
A luminaire with two light sources of different wavelengths, such as ultraviolet and white light, that adjusts intensity automatically and smoothly transitions between them, ensuring the eye can adapt without discomfort by varying the speed of intensity change based on current intensity levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional lamps switch abruptly between white light and ultraviolet radiation, then inspection efficiency is improved, but eye strain and potential eye damage occur due to sudden brightness changes
Solution Approach 1:
The patent implements dynamic intensity adjustment where the white light intensity is gradually reduced while ultraviolet radiation intensity is gradually increased during mode transitions. This dynamic control allows the eye to adapt smoothly to changing brightness levels, eliminating the harmful abrupt transitions while maintaining efficient inspection capabilities through controlled temporal evolution of light parameters.
Solution Approach 2:
The patent changes the physical parameter of light intensity over time during transitions between illumination modes. By controlling the temporal profile of intensity changes - specifically by implementing gradual intensity modulation rather than step changes - the system resolves the contradiction between maintaining inspection efficiency and preventing eye strain through parameter evolution.
2Illumination intensity
If the intensity of white light is increased for better visibility, then visual perception is improved, but the contrast sensitivity of mesopic and scotopic vision is reduced
Solution Approach 1:
The patent implements dynamic intensity control that adapts the white light intensity based on the operational phase. During defect detection under ultraviolet radiation, white light intensity is gradually reduced to preserve contrast sensitivity. During defect inspection and assessment under white light, intensity is increased for visibility. This temporal dynamics allows optimal adaptation to different visual tasks.
Solution Approach 2:
The patent changes the illumination intensity parameter according to the specific inspection task being performed. By implementing task-dependent intensity modulation - lower intensity for UV excitation to maintain contrast, higher intensity for white light inspection to improve visibility - the system resolves the contradiction between visibility and contrast sensitivity through intelligent parameter adaptation.
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 luminaire reduces eye strain by smoothly adjusting intensity, allowing for effective and accurate visual inspection with minimal impairment of visual perception.
Implementation Method 1
at least two light sources which emit electromagnetic radiation in different wavelength ranges
Implementation Method 2
at least one of the light sources is formed by a discharge lamp and/or by at least one light-emitting semiconductor diode (LED)
Implementation Method 3
using adjustable LEDs for visible, ultraviolet, and infrared radiation, with control units for smooth transitions based on the Weber-Fechner law to adapt to human eye sensitivity
Implementation Method 4
defects on workpiece surfaces are made visible by a fluorescent agent when excited with ultraviolet radiation
Data Source
Figure 1
Figure 2~3
Figure 4(a)~4(b)
AI summary
The invention relates to a light, in particular for testing workpiece surfaces using a fluorescent marking means, which light has at least two lighting means (2, 3) which emit electromagnetic radiation with different wavelength ranges. According to the invention, the light is characterized in that the intensity with which the lighting means (2, 3) irradiates can be adjusted separately for at least one of the lighting means (2, 3). Expediently, the light (1) is configured to increase or reduce the intensity of at least one of the lighting means (2, 3) and at the same time to keep the intensity of at least one other of the lighting means (2, 3) constant, or to reduce it or increase it in the opposite way to the first-mentioned lighting means. In a refinement of the invention, the light (1) is configured to adjust the intensity at such a speed that the human eye can adapt to a change in the intensity during the adjustment without adverse effects on the person's sight.