Gas Measurement Head Vertical Flow Signal Stability
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Solution Overview
Problem
Existing gas concentration measurement devices face signal fluctuations due to vortex formation caused by pressure fluctuations or rapid gas flow changes, which impairs the signal-to-noise ratio, especially in measuring paramagnetic gases like oxygen.
Innovation Solution
A measuring head design with a plate and metal bodies that route the gas flow perpendicularly to the measuring element, minimizing vortex orientation and allowing gas to diffuse to the measurement points, thereby reducing signal fluctuations and increasing magnetic flux density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gas is routed horizontally through the measuring gas sample holder, then the structure is simple, but vortices develop due to pressure fluctuations and rapid flow changes, causing signal fluctuations and impaired signal-to-noise ratio
Solution Approach 1:
The patent changes the gas flow direction from horizontal to vertical, routing the gas sample through the measuring element in the vertical direction. This dimensional change prevents vortex formation that occurs with horizontal flow, thereby improving signal stability and signal-to-noise ratio while maintaining structural simplicity
2Measurement precision
If the measuring element is spaced from the bottom plate and cover plate, then gas can diffuse to the measuring element, but vortices oriented horizontally make uniform gas admission difficult and increase signal fluctuations
Solution Approach 1:
The patent inverts the conventional horizontal gas routing approach and implements vertical gas flow through the measuring element. This inversion changes vortex orientation from horizontal to vertical, aligning them with the flow direction rather than perpendicular to it, thereby achieving uniform gas admission and reducing signal fluctuations
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 design enhances the signal-to-noise ratio and allows for precise detection of gas concentration changes with high time resolution, particularly suitable for medical respiration systems, by ensuring gas flows perpendicularly to the measuring element and reducing interference from induced currents.
Implementation Method 1
The thermal conductivity of paramagnetic gases is known to change under the effect of magnetic fields. The molecules of a paramagnetic gas have a permanent magnetic torque, which is oriented in an external magnetic field. As a result, there is not only a change in susceptibility and hence an increase in the magnetic flux, but the possibility of transmitting heat energy to adjacent molecules by collisions is also reduced due to the orientation of the molecules. This causes a slight change in the thermal conductivity of the gas.
Implementation Method 2
a first metal body (12, 13) is arranged above the measuring element and a second metal body (14, 15) is arranged under the second side of the plate under the measuring element, with said metal bodies acting as magnetic poles during the operation of the measuring head
Implementation Method 3
an opening (18) is formed in the plate, so that the gas sample can flow through one of the metal bodies and through the opening on a side of the measuring element facing the opening and can emerge through the other metal body during the operation of the measuring head
Data Source
AI summary
A measurement head is provided for a device for measuring the concentration of at least one gas, in particular oxygen. A gas sample a measurement element (1) is arranged in the region of an opening on a circuit board (11). To convey gas a duct (16, 17) is formed in each of two metal bodies, which surround the measurement element (1) and serve as magnetic poles. During operation of the measurement head the gas sample flows substantially perpendicularly, first through one of the metal bodies (12, 13), and then through the opening (18) on a side of the measurement element (1) facing the opening and emerges again through the other metal body (14, 15).