Prism-Shaped Material Absorption Measurement Without Fixed Path Lengths
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Solution Overview
Problem
Existing methods for determining the absorption and extinction coefficients of prism-shaped materials are complex and time-consuming, especially when using spectroscopic beams for multiple wavelengths, and there is a need for a simpler and faster method.
Innovation Solution
A method involving three approaches to determine absorption and extinction coefficients, including determining refractive indices at a minimum deviation condition, calculating excess beam intensity attenuation, and performing a regression on intensity values to obtain coefficients without requiring specific path lengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional methods (such as Herzinger et al. using θ-2θ goniometer system) are used to determine refractive indices, then measurement precision is improved, but device complexity and ease of operation deteriorate due to difficult positioning requirements in typical dual arm ellipsometer systems
Solution Approach 1:
The patent changes the measurement approach by using minimum deviation angle conditions and specific geometric configurations (prism apex angle, incident angle) to simplify the operational complexity while maintaining measurement precision for refractive index determination
2Measurement precision
If existing methods for determining absorption and extinction coefficients are used, then measurement precision is improved, but productivity deteriorates due to complex and time-consuming procedures especially for multiple wavelengths
Solution Approach 1:
The patent segments the determination of absorption and extinction coefficients into distinct approaches: (1) using minimum deviation conditions to determine refractive indices, (2) calculating excess beam intensity attenuation, and (3) performing regression on intensity values. This segmentation allows for more efficient multi-wavelength analysis while maintaining precision
Solution Approach 2:
The patent replaces complex mechanical positioning and multi-step measurement procedures with computational methods including mathematical regression analysis, thereby reducing the time required for determining absorption and extinction coefficients across multiple wavelengths
3Measurement precision
If existing methods require specific path lengths for determination, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent extracts the path length requirement from the measurement procedure by using excess beam intensity attenuation calculations and regression methods that can determine absorption coefficients without requiring precise control or measurement of specific path lengths, thereby reducing device complexity
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
Enables quick and straightforward determination of absorption and extinction coefficients for prism-shaped materials, reducing complexity and time required compared to existing methods.
Implementation Method 1
a beam of electromagnetic radiation from said source can be directed to enter the source side of said prism shaped material, be refracted thereby, pass through said prism shaped material and exit from said detector side of said prism shaped material at a refracted exit angle
Implementation Method 2
determining the absorption and extinction coefficients of a material
Data Source
AI summary
Methodology of determining absorption and an extinction coefficient of a prism shaped material, including simultaneously for a multiplicity of wavelengths, using an easy to practice technique.