Optical Oxygen Sensor Drift Compensation via Segmented Dyes
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Solution Overview
Problem
Existing optical oxygen sensors face challenges with temperature dependence and low drift stability, leading to distorted measurements due to factors like photobleaching and sensitivity to oxygen, which limits their application scope and measurement accuracy.
Innovation Solution
An optochemical sensor element with a functional layer subdivided into segments, including an oxygen-insensitive reference dye and an oxygen-sensitive indicator dye, allows for in situ detection and compensation of drift, minimizing the need for sensor removal and enhancing measurement quality by using a substrate layer transparent to stimulation and luminescence signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an optical oxygen sensor uses an indicator dye sensitive to oxygen for measurement, then measurement capability is achieved, but drift stability deteriorates due to photobleaching and sensitivity to oxygen
Solution Approach 1:
The functional layer is divided into multiple functional segments, with each segment containing either a reference dye or an indicator dye. This segmentation allows the sensor to simultaneously perform reference measurements (for drift detection) and oxygen measurements (for analyte detection) without interference, thereby resolving the contradiction between measurement capability and drift stability
Solution Approach 2:
A reference dye insensitive to oxygen is introduced as an intermediary element. This reference dye experiences the same environmental conditions and photobleaching effects as the indicator dye but does not respond to oxygen. By comparing the luminescence signals of both dyes, the system can detect and compensate for drift, thus maintaining measurement precision while improving reliability
2Productivity
If the sensor operates continuously in the measuring medium, then productivity is improved, but measurement accuracy deteriorates due to uncorrected drift
Solution Approach 1:
The sensor enables continuous operation in the measuring medium by performing both reference and oxygen measurements in situ without removal. The dual-dye system allows continuous monitoring of both drift (via reference dye) and oxygen concentration (via indicator dye), maintaining measurement accuracy throughout continuous operation
Solution Approach 2:
The reference dye provides continuous feedback on drift conditions by comparing its luminescence signal with that of the indicator dye. This feedback mechanism enables real-time detection and compensation of drift, allowing the system to maintain measurement precision during continuous operation and thereby improving productivity
3Measurement precision
If the sensor is removed from the measuring point for drift determination, then measurement accuracy is improved, but operational effort increases and productivity decreases
Solution Approach 1:
The sensor performs self-diagnosis and self-calibration by using the reference dye to detect drift in situ. The system automatically compares the luminescence signals of the reference and indicator dyes to determine drift, eliminating the need for manual removal and external calibration procedures, thereby reducing operational effort while maintaining measurement accuracy
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
Enables reliable and accurate oxygen measurement by detecting and compensating for drift, thereby improving the stability and reliability of the sensor, allowing for continuous operation without removing the sensor from the measuring point and reducing operational effort.
Implementation Method 1
the second reference dye comprises an organic material and is insensitive to oxygen, and is suitable to emit a second luminescence signal upon stimulation with a first stimulation signal
Implementation Method 2
the indicator dye comprises an organic material and is sensitive to oxygen, and is suitable to emit a third luminescence signal upon stimulation with the first stimulation signal
Implementation Method 3
the substrate layer is transparent to the stimulation signal and to the second and third luminescence signals
Data Source
AI summary
The present disclosure relates to an optochemical sensor element, comprising: a substrate layer having a first substrate side facing toward a measuring medium and a second substrate side opposite the first substrate side; a functional layer arranged on the first substrate side and is subdivided into functional segments separate from one another, wherein a first functional segment has a second reference dye and a second functional segment has an indicator dye, wherein the second reference dye comprises an organic material and is insensitive to oxygen, and is suitable to emit a second luminescence signal upon stimulation with a first stimulation signal, wherein the indicator dye comprises an organic material and is sensitive to oxygen, and is suitable to emit a third luminescence signal upon stimulation with the first stimulation signal, wherein the substrate layer is transparent to the stimulation signal and to the second and third luminescence signals.