Optical Sensor Element Multilayer Protection Against Oxidative Inactivation
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Solution Overview
Problem
Conventional optical sensors lack sufficient protection for their luminescence indicators against destructive influences in aggressive environments, leading to a limited service life when exposed to reactive compounds such as ozone, superoxide, hydroxyl radicals, or chlorine, making them unsuitable for reliable analyte determination in complex media.
Innovation Solution
The development of an optical sensor element with a multilayer structure, featuring indicator protectors in specific layers to prevent destructive influences, where indicators are immobilized to prevent diffusion and are protected by reactants, catalysts, or adsorbents that neutralize or adsorb harmful compounds, ensuring effective protection against oxidative inactivation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional optical sensor elements are used without additional protective layers, then the structure remains simple and manufacturing is easy, but the indicators are exposed to destructive influences from aggressive media such as oxidizing agents, leading to limited service life
Solution Approach 1:
The sensor element is divided into multiple functional layers: a first layer containing indicators and a second layer containing indicator protectors. This segmentation allows each layer to perform its specific function independently, protecting the indicators from aggressive media while maintaining manufacturing feasibility through standardized multilayer construction processes
Solution Approach 2:
Indicator protectors are introduced as intermediary substances in the second layer that act as mediators between the aggressive external media and the sensitive indicators. These protectors (such as antioxidants, reducing agents, or radical scavengers) neutralize harmful substances before they reach the indicators, extending sensor service life without complicating the overall device structure
2Reliability
If indicator protectors are added to protect against reactive compounds, then protection against oxidative inactivation is improved, but the device complexity increases due to additional layers and components
Solution Approach 1:
The protective function is localized to specific regions where it is most needed. The second layer with indicator protectors is positioned specifically between the external media and the first layer containing indicators, providing targeted protection only where aggressive substances would contact the sensitive indicators, rather than requiring protective measures throughout the entire sensor structure
Solution Approach 2:
The sensor element employs a composite structure combining different materials with complementary properties: the first layer contains luminescence indicators embedded in a matrix material, while the second layer contains indicator protectors (such as antioxidants or reducing agents) in a compatible matrix. This composite approach provides both sensing functionality and chemical protection without requiring overly complex individual components
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
The sensor element significantly extends the service life by effectively protecting indicators from oxidative species, maintaining sensitivity and accuracy even in environments with strong oxidizing agents, allowing for prolonged and reliable analyte detection without significant distortion.
Implementation Method 1
The sensor principle is based on the fact that the indicators are first brought into an excited energy state by the supply of excitation energy. Upon releasing energy, e.g., in the form of light of a specific wavelength, the indicators transition to a lower energy level.
Implementation Method 2
which are based on the property of certain luminescence indicators whose luminescence, excited by light irradiation of a certain wavelength v 1, is dynamically quenched with wavelength v 2 in the presence of oxygen
Implementation Method 3
The indicators and the indicator protectors are arranged in different layers of the multilayered, at least two-layered element... the indicator protectors are selected in such a way that they protect the indicators from destructive/inactivating influences
Data Source
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AI summary
The invention relates to an optical sensor element, comprising indicators (2), selected from luminescence-active means that are of the same type or different, and indicator protectors (1), and to a sensor, comprising at least one such sensor element, an energy source that excites the luminescence emission of the indicators, and a detector unit, wherein the sensor element or sensor is suitable for detecting molecular oxygen in a gaseous or liquid medium and/or for determining the molecular oxygen content of a gaseous or liquid medium and at least one layer of the sensor element bearing the indicator protectors is designed in such a way that the diffusion rate of the molecular oxygen formed on the indicator protectors by means of the reduction of strong oxidants back into the medium is greater than the diffusion rate of molecular oxygen from the medium in direction of the at least one layer bearing the indicator molecules.