Paramagnetic Oxygen Sensor Using Three-Channel Flow Deflection
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Solution Overview
Problem
Existing oxygen sensors based on paramagnetism are large in size and susceptible to vibrations, lacking sensitivity and having moving parts.
Innovation Solution
A device with three channels - a main channel and two smaller channels arranged next to it, utilizing an inhomogeneous magnetic field and flow sensors, including resistance thermometers, to measure gas flow deflection and determine oxygen content without moving parts, enabling miniaturization and high sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a mirror system with a free-swinging dumbbell is used for oxygen measurement, then oxygen concentration can be measured based on paramagnetism, but the device becomes large in size and susceptible to vibration
Solution Approach 1:
The patent replaces the mechanical mirror system with a stationary arrangement where the magnetic field gradient itself performs the measurement function. The inhomogeneous magnetic field creates different flow resistance in channels with and without oxygen, and flow sensors detect these differences directly, eliminating the need for mechanical moving parts like mirrors and dumbbells.
Solution Approach 2:
The invention extracts the essential measurement function from the complex mirror system and isolates it into a simplified channel-based flow measurement arrangement. By removing the mechanical components and keeping only the essential magnetic field interaction and flow detection, the device achieves miniaturization while maintaining measurement capability.
2Measurement precision
If a mirror system with a free-swinging dumbbell is used for oxygen measurement, then oxygen concentration can be measured based on paramagnetism, but the device becomes susceptible to vibration
Solution Approach 1:
The patent replaces the mechanical mirror system with a stationary arrangement where the magnetic field gradient itself performs the measurement function. The inhomogeneous magnetic field creates different flow resistance in channels with and without oxygen, and flow sensors detect these differences directly, eliminating the need for mechanical moving parts like mirrors and dumbbells.
3Volume of moving object
If microsystems technology is used to miniaturize the device, then device size is reduced and production costs are lowered, but measurement sensitivity must be maintained
Solution Approach 1:
The device is segmented into multiple parallel channels (measurement channel and reference channel), each with its own flow sensor. This segmentation allows the use of small, miniaturized flow sensors while maintaining measurement sensitivity through differential measurement of flow rates between channels, compensating for the reduced size of individual components.
Solution Approach 2:
The patent applies local quality by creating an inhomogeneous magnetic field that is concentrated in specific regions around the channels. This localized magnetic field gradient ensures that the paramagnetic oxygen molecules experience sufficient force for deflection even in the miniaturized channel structure, maintaining measurement sensitivity despite the reduced overall device size.
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 solution results in a compact, vibration-resistant oxygen sensor with enhanced sensitivity, produced using microsystems technology, offering high reproducibility and low production costs while maintaining industrial usability.
Implementation Method 1
The latter sensor is based on the paramagnetic property of oxygen. Paramagnetic substances are drawn into an inhomogeneous magnetic field
Implementation Method 2
the resistors are cooled down to different degrees at different flow speeds, which changes their resistance
Implementation Method 3
the resistors are cooled down to different degrees at different flow speeds, which changes their resistance
Data Source
AI summary
The oxygen sensor has a gas inlet (1), a gas outlet (8) and a measuring zone (3) between the gas inlet and gas outlet. The measuring zone has three channels arranged side by side in the form of a main channel (6). A measuring channel (7) is arranged on one side of the main channel and a reference channel (5) is arranged on the other side of the main channel. A magnet (4) is arranged on the side of the measuring channel opposite to the main channel and having a non-homogeneous magnetic field. Flow sensors are provided in the measuring channel and reference channel.