Multi-Wavelength Optical Property Measurement via Beam Splitter
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Solution Overview
Problem
Existing methods for determining optical properties at thin layers are sensitive to intensity variations, leading to unreliable and time-consuming measurements due to dependence on light intensity fluctuations and the need for sequential wavelength evaluation.
Innovation Solution
A method that irradiates light of multiple wavelengths simultaneously onto a thin layer, using a beam splitter to direct light to both the layer and a high-resolution reference detector, allowing for simultaneous interference recording and intensity measurement, with an evaluation unit determining reflection and transmission coefficients independent of light intensity, using a database for quick and precise optical property determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sequential wavelength evaluation is used, then measurement precision can be maintained, but measurement time increases significantly
Solution Approach 1:
The patent merges sequential wavelength-by-wavelength evaluation into a single simultaneous multi-wavelength evaluation process. The evaluation unit processes multiple wavelengths at once using a database of pre-calculated optical properties, transforming the time-consuming sequential approach into a rapid parallel computation that maintains precision while dramatically reducing measurement time.
Solution Approach 2:
The patent performs preliminary calculations of optical properties for multiple wavelengths in advance and stores them in a database. During actual measurement, the evaluation unit simply retrieves and compares these pre-computed values with measured intensities, eliminating the need for time-consuming real-time sequential calculations while maintaining measurement accuracy.
2Device complexity
If intensity-dependent measurement methods are used, then device complexity is reduced, but measurement reliability deteriorates due to sensitivity to intensity fluctuations
Solution Approach 1:
The patent replaces intensity-dependent mechanical/optical measurement systems with a wavelength-ratio-based evaluation system. Instead of relying on absolute intensity measurements that are sensitive to fluctuations, the system measures intensities at multiple wavelengths and evaluates their ratios or relationships, which are independent of overall intensity variations. This substitution maintains simple device architecture while dramatically improving measurement reliability.
Solution Approach 2:
The patent changes the measurement parameter from absolute light intensity to the relationship between intensities at different wavelengths. By measuring intensities at multiple wavelengths and evaluating their relative relationships rather than absolute values, the system becomes insensitive to intensity fluctuations while maintaining simple measurement optics.
3Productivity
If multiple wavelengths are measured simultaneously, then productivity increases, but measurement precision may deteriorate due to intensity variations
Solution Approach 1:
The patent replaces intensity-dependent measurement with wavelength-ratio-based evaluation, allowing simultaneous multi-wavelength measurement without precision loss. The evaluation unit processes multiple wavelengths together using pre-calculated optical properties stored in a database, achieving both high productivity and maintained precision through the substitution of measurement methodology.
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 approach enables fast, precise, and reliable measurement of optical properties by eliminating intensity fluctuations' impact and allowing simultaneous evaluation of multiple wavelengths, resulting in significantly improved sensitivity and reduced computational time.
Implementation Method 1
a beam splitter, which directs a portion of the light onto the thin layer, and a further portion of the light onto a high-resolution reference detector
Implementation Method 2
Interference effects at the at least one thin layer are simultaneously recorded throughout the whole narrow wavelength range
Data Source
AI summary
In a method for determining optical properties by measuring intensities at a thin layer, light is directed into the thin layer and passes through a beam splitter, which directs a first part of the light onto the thin layer and a second part of the light onto a reference detector. Interference of the first part of the light in the thin layer is detected via a high-resolution detector and forwarded to an evaluating unit, which determines the reflection and/or transmission coefficients, which are correlated with the optical layer thickness through a comparison using at least one database stored in the evaluating unit. The optical layer thickness is obtained as a gray value modification by way of a gray scale value analysis and a conversion factor stored in the at least one data base. A corresponding device and intended uses of the method and device are also described.