Arc Lamp Beam Stabilization via Dual Reflection
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Solution Overview
Problem
Arc lamps used in systems like ellipsometers experience a variation in the effective origin point of their electromagnetic radiation beam as they age, leading to changes in the oblique angle of incidence on a sample surface, which is not consistently maintained.
Innovation Solution
A system comprising two reflecting means, positioned to rotate a vertically oriented beam of electromagnetic radiation from an arc lamp 90 degrees, ensuring a constant angle of incidence on a sample surface by reflecting the beam from the 'X' axis to the 'Y' axis and then to the 'Y'-Z plane, using mirrors or prisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a vertically oriented Arc lamp is used to provide electromagnetic radiation, then the lamp structure is simple and compact, but the effective origin point varies with lamp aging causing the angle of incidence to change
Solution Approach 1:
The patent introduces a second spatial dimension for the beam path by using two reflecting means arranged at right angles. The first reflector redirects the beam 90 degrees horizontally, and the second reflector redirects it 90 degrees vertically onto the sample. This dimensional transformation decouples the lamp's vertical orientation from the final beam angle, allowing the effective origin point to move along the electrodes without affecting the incidence angle on the sample.
Solution Approach 2:
The two reflecting means act as intermediary elements between the Arc lamp and the sample. These reflectors serve as mediating surfaces that transfer the beam from the vertically oriented lamp to the horizontally oriented sample path. The reflectors absorb and compensate for the origin point variation, maintaining a constant angle of incidence through their fixed geometric arrangement.
2Ease of operation
If the effective origin point of the beam is allowed to vary with lamp aging, then the lamp operation is continuous without adjustment, but the angle of incidence on the sample changes
Solution Approach 1:
The patent creates a dynamic compensation system where the fixed geometric arrangement of the two reflecting means automatically compensates for the dynamic variation in the effective origin point. As the origin point moves along the electrodes during lamp aging, the dual-reflection geometry maintains a constant incidence angle through its invariant angular relationships, eliminating the need for manual adjustments.
Solution Approach 2:
The patent changes the spatial parameters of the beam path by introducing two 90-degree reflections. This parameter transformation converts the problem from one where the incidence angle directly follows the origin point movement to one where the incidence angle is decoupled through fixed angular relationships. The beam undergoes two orthogonal transformations that stabilize the final incidence angle despite origin point variation.
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 maintains a consistent angle of incidence on the sample surface regardless of the effective origin point's location, addressing the issue of beam orientation changes due to arc lamp aging.
Implementation Method 1
a first reflecting means positioned to receive an X axis directed beam of electromagnetic radiation from said Arc lamp and reflect it 90 degrees into a Y axis directed beam
Implementation Method 2
a second reflecting means oriented to reflectively direct said received Y axis directed beam, into a Y-Z Plane locus and onto said sample surface at an oblique Angle-of-Incidence
Data Source
AI summary
A system for stabilizing the angle of incidence a beam of electromagnetic radiation from a vertically oriented Arc lamp onto a horizontally oriented sample surface.