Barrier-Based Flow Sensor Layout for Fast Direction Detection
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Solution Overview
Problem
Existing gas flow meters cannot detect the direction of gas flow and MEMS flow sensors have slow response times, making them inadequate for certain monitoring applications.
Innovation Solution
An apparatus and method using a substrate with a barrier and multiple sensors positioned at specific distances to generate signals that allow for the determination of fluid flow properties, including direction, by creating a difference in upstream and downstream fluid characteristics, and processing these signals to determine flow velocity, magnitude, and direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If MEMS flow sensors are used to detect flow direction, then flow direction detection capability is improved, but response time becomes slow
Solution Approach 1:
The flow sensor is divided into multiple sensing elements positioned at different locations within the conduit. Each element detects flow characteristics independently, and by comparing signals from multiple elements, the system determines flow direction without relying on a single slow-response MEMS element. This segmentation allows parallel detection across multiple points, improving overall response time.
Solution Approach 2:
The invention transitions from detecting flow direction along a single linear dimension to using multiple sensing elements distributed in two or three dimensions within the conduit cross-section. This spatial distribution enables determination of flow direction through comparative analysis of signals from different spatial positions, achieving faster response by utilizing dimensional information rather than relying on a single point measurement.
2Device complexity
If a single flow sensor is used in ventilator applications, then device complexity is reduced, but flow direction detection capability is lost
Solution Approach 1:
Multiple flow sensing elements are integrated into a single sensor assembly that serves dual functions: measuring flow magnitude and determining flow direction. The same sensing elements used for velocity detection also provide directional information when their signals are compared, eliminating the need for separate directional sensors and reducing overall device complexity while maintaining detection capability.
Solution Approach 2:
The barrier structure serves as an intermediary element that creates measurable differences in flow characteristics between upstream and downstream regions. By positioning sensing elements relative to this barrier, the system indirectly detects flow direction through the barrier-induced flow pattern changes, rather than requiring direct bidirectional sensing capability in each element.
Data Source
AI summary
An apparatus and method for use in determining one or more fluid flow properties of a fluid in a conduit is disclosed. The apparatus includes a substrate including a barrier, a first flow sensor coupled to the substrate and a second flow sensor coupled to the substrate. The first flow sensor is located at a first sensor distance from a first barrier surface, and the second flow sensor is located a second sensor distance from the second barrier surface. The first sensor distance is substantially equal to the second sensor distance. In operation, the first flow sensor produces a first sensor signal, and the second flow sensor produces a second sensor signal. The direction of flow for the fluid is determined by comparing the first sensor signal to the second sensor signal.