Modulation Range Stabilization via Filter Flank Detection
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Solution Overview
Problem
Existing methods for measuring absorption lines of substances using wavelength-variable radiation sources face challenges in ensuring modulation range stability, particularly when multiple sources are used simultaneously, leading to complexity and increased maintenance due to the need for multiple reference cuvettes and precise wavelength control.
Innovation Solution
The method employs a filter with a wavelength-selective pass band and cut-off band to secure the modulation range by identifying and comparing the position of filter flanks in the spectrum, allowing for the adjustment of the radiation source to maintain the predefined modulation range, thereby simplifying the measurement process and reducing the need for multiple reference cuvettes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple wavelength-variable radiation sources are used simultaneously to measure multiple absorption lines, then measurement capability and productivity are improved, but device complexity and maintenance requirements increase due to the need for multiple reference cuvettes and precise wavelength control
Solution Approach 1:
The patent combines multiple wavelength-variable radiation sources into a single spectrometer system, allowing simultaneous measurement of multiple absorption lines. The control and evaluation unit coordinates multiple radiation sources and detection apparatus, merging their functions into one integrated system that maintains measurement capability while reducing the need for separate reference cuvettes for each source.
Solution Approach 2:
The spectrometer is designed with universal functionality to handle multiple radiation sources and detection apparatus through a single control and evaluation unit. This multi-functional approach allows the system to measure different substances and absorption lines using the same hardware platform, reducing overall device complexity and maintenance requirements.
2Reliability
If the modulation range is made wider to completely encompass the absorption line and cover the environment, then measurement reliability is improved, but the precision of wavelength control and modulation range stability become more difficult to maintain
Solution Approach 1:
The control and evaluation unit implements feedback mechanisms to monitor and adjust the modulation range of each radiation source. By continuously evaluating the detected radiation and comparing it with expected absorption line positions, the system maintains wavelength control precision even when using wider modulation ranges to ensure complete coverage of absorption lines and their environments.
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 ensures accurate measurement of absorption lines by maintaining the modulation range stability, reducing complexity and maintenance, and allowing for flexible use with multiple radiation sources, while providing a cost-effective and reliable method for determining substance concentrations.
Implementation Method 1
a filter (35) is provided having a wavelength-selective pass band and cut-off band
Implementation Method 2
In particular a tunable diode laser is suitable as the wavelength-variable radiation source having a narrow line width
Implementation Method 3
The absorption of the radiation in the region of an absorption line can substantially be based on energy transfers that are triggered by radiation having a wavelength corresponding to the energy of the respective transfer
Data Source
AI summary
A method of securing a modulation range of a wavelength-variable radiation source as part of the measurement of an absorption line of a substance comprises: the radiation source being controlled to transmit radiation such that the wavelength of the radiation runs through the modulation range in accordance with a time pattern; the radiation being filtered by means of a filter in whose pass band the absorption line is disposed and which has at least one filter flank whose actual wavelength is within the modulation range; a spectrum of the filtered radiation being determined in that the intensity of the filtered radiation is detected with respect to the time pattern; and a determination being made whether the spectrum has the at least one filter flank.