Optochemical Sensor Barrier Layer for Interferent Protection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional optochemical sensors are prone to damage and falsified measurements in harsh environments due to lack of protection against interferents such as corrosive gases and volatile organic compounds, leading to reduced service life and increased maintenance costs.
Innovation Solution
An optochemical sensor with a barrier layer that prevents the passage of interferents while allowing the passage of analytes, comprising a network of organic and inorganic structural elements formed from a curable precursor solution, which is applied to face the measurement medium and protect the sensing layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional optochemical sensors are used in harsh environments, then they can measure analytes, but they are damaged by interferents leading to reduced service life
Solution Approach 1:
A barrier layer is introduced as an intermediary between the measurement medium containing interferents and the optochemical sensor element. This barrier layer selectively blocks interferents (such as corrosive gases and volatile organic compounds) while allowing analytes to pass through, thereby protecting the sensor from damage without interfering with analyte measurement.
Solution Approach 2:
The barrier layer is constructed from a curable precursor solution that forms a network of organic and inorganic structural elements. This composite structure provides both mechanical integrity and selective permeability, combining the benefits of organic materials (flexibility, chemical resistance) with inorganic materials (structural stability, porosity control).
2Reliability
If a barrier layer is added to protect the sensor, then protection against interferents is improved, but device complexity increases
Solution Approach 1:
The barrier layer is implemented as a thin film coating applied directly to the optochemical sensor element. This thin-film approach provides effective protection against interferents while minimizing the increase in device dimensions and structural complexity. The layer is thin enough to maintain sensor response time but sufficient to block harmful interferents.
Solution Approach 2:
The barrier layer is applied in advance to the optochemical sensor element before deployment in the harsh environment. This preliminary protective action ensures the sensor is pre-protected against interferents, eliminating the need for complex real-time protection mechanisms or post-exposure remediation.
3Object-affected harmful factors
If the barrier layer blocks all substances, then protection is maximized, but analyte passage is prevented
Solution Approach 1:
The barrier layer exhibits different permeability properties for different substances: it is impermeable to interferents (such as corrosive gases and volatile organic compounds) while being permeable to analytes. This selective local quality is achieved through the specific pore size, charge characteristics, and chemical composition of the barrier layer, allowing it to differentiate between harmful substances and target analytes.
Solution Approach 2:
The barrier layer utilizes a porous structure with carefully controlled pore sizes that allow analyte molecules to pass through while blocking larger or differently structured interferent molecules. The porosity is optimized to maintain analyte permeability while providing effective barrier properties against harmful substances in the measurement medium.
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 barrier layer effectively prevents falsified measurements and maintains response time by blocking interferents while allowing analytes to pass through, thereby extending the sensor's service life and reducing maintenance costs in harsh environments.
Implementation Method 1
the barrier layer provides protection to the optochemical sensor element from at least one interferent in the measurement medium by preventing the passage of the interferent while allowing the passage of the gaseous or dissolved analyte
Implementation Method 2
a barrier layer, wherein the barrier layer provides protection to the optochemical sensor element from at least one interferent in the measurement medium... comprising a network of organic and inorganic structural elements formed from a curable precursor solution
Data Source
AI summary
An sensor (2) based on an optical-sensing technique measures gaseous or dissolved analytes in a measurement medium (4). The sensor has a sensor housing (6) and an optochemical sensor element (20, 220) arranged within the sensor housing. The optochemical sensor element (220) has a substrate (222), a sensing layer (224) and a barrier layer (230). The barrier layer is arranged to protect the optochemical sensor element from interfering substances (234) present in the measurement medium.