ATR Reflection Element With Transmission Layer For Weakly Absorbing Samples
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Solution Overview
Problem
Existing ATR reflection elements face challenges in achieving a high signal-to-noise ratio and efficient absorption of radiation by non-translucent substances, particularly when testing weakly absorbing samples, due to the compromise between the number of reflections and optical passage length.
Innovation Solution
An ATR reflection element with a transmission layer having a first effective refractive index greater than a second effective refractive index, where the transmission layer is designed to take up fluid and allows electromagnetic radiation to penetrate, enhancing absorption through both transmission and total reflection mechanisms, thereby strengthening the absorption signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the optical passage length through the ATR reflection element is increased to enhance absorption signal, then the absorption signal strength is improved, but the signal-to-noise ratio deteriorates due to excessive radiation attenuation
Solution Approach 1:
The invention divides the ATR reflection element into multiple separate reflection elements arranged in series. Each reflection element provides a portion of the total reflections needed for sufficient absorption signal, while the modular structure allows optimization of the optical passage length through each individual element to prevent excessive attenuation. This segmentation enables achieving high absorption signal strength without sacrificing signal-to-noise ratio.
2Measurement precision
If the number of reflections is increased to strengthen the absorption signal, then the absorption signal is improved, but the optical passage length must be increased which causes excessive radiation attenuation
Solution Approach 1:
The invention segments the total number of reflections across multiple separate reflection elements. Each element contributes a specific number of reflections (e.g., 2-5 reflections per element) to accumulate the desired total absorption signal strength, while keeping the optical passage length through each individual element short enough to avoid excessive radiation attenuation.
Solution Approach 2:
The invention transitions from a single-element approach to a multi-element spatial arrangement. By distributing reflection elements along the optical path in a sequential configuration, the system achieves multiple reflections without requiring a proportionally increased optical passage length through any single element, effectively utilizing spatial dimensionality to resolve the contradiction.
3Measurement precision
If materials with high absorption coefficients are used for the ATR reflection element, then the absorption signal is strengthened, but the optical passage length must be kept very short which limits the number of reflections
Solution Approach 1:
The invention uses multiple reflection elements made from materials with high absorption coefficients. Each element is designed with a short optical passage length optimized for the specific material properties, allowing a manageable number of reflections per element. The cumulative effect of multiple elements achieves the desired total absorption signal strength without requiring any single element to have an impractically short passage length.
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 design significantly enhances the absorption signal, allowing for shorter optical passage lengths without attenuating the signal-to-noise ratio, enabling more efficient analysis of weakly absorbing samples and allowing the use of materials with high absorption coefficients.
Implementation Method 1
the beam of light undergoes refraction at the first layer boundary and, on passage through the transmission layer, undergoes transmission by the fluid taken up into the transmission layer
Implementation Method 2
on the fluid-permeable, planar, second layer boundary, wherein the beam of light undergoes total reflection at the second layer boundary
Implementation Method 3
the beam of light undergoes absorption by the fluid, in particular by the analyte, wherein on transmission, the beam of light also undergoes absorption by the fluid
Data Source
AI summary
An ATR reflection element includes a main body with a first effective refractive index n1, a transmission layer which comprises a first layer boundary, and an opposite second layer boundary. The transmission layer takes up a fluid by way of the second layer boundary, wherein the transmission layer adjoins the main body. The boundary between the transmission layer and the main body is formed by the first layer boundary, wherein the transmission layer at the second layer boundary has a second effective refractive index n2. The first effective refractive index n1 is greater than the second effective refractive index n2 and the second effective refractive index n2 is greater than 1, wherein the first effective refractive index n1 and the second effective refractive index n2 are determined in each case in a vacuum at 25° C. at the IR wavelength λATR, wherein λATR is selected from the wavelength range between 2 μm and 20 μm. Furthermore, the disclosure relates to an ATR spectrometer comprising said ATR reflection element, and an ATR spectroscopy method.