Flow Sensing Device Bubble Detection for Accurate Flow Measurement
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Solution Overview
Problem
Flow sensing devices face inaccuracies due to air bubbles forming at the surface of flow sensing components, leading to erroneous flow rate measurements, particularly in applications requiring precise control of fluid delivery, such as infusion pumps.
Innovation Solution
A flow sensing device with a controller component that monitors flow sensing component outputs to detect air bubbles based on predetermined characteristics, using temperature sensors positioned upstream and downstream of a heating element to determine air bubble conditions and generate appropriate indications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the flow sensing component makes direct contact with the flowing media, then the measurement capability is improved, but air bubbles form at the surface leading to measurement inaccuracies
Solution Approach 1:
The controller proactively monitors flow sensing component outputs to detect air bubbles before they significantly affect measurements. By initiating detection early and implementing correction procedures in advance, the system prevents measurement inaccuracies rather than reacting to them after they occur.
Solution Approach 2:
The system continuously monitors the flow sensing component output and uses this feedback to detect air bubble presence. The controller compares real-time measurements against expected values and triggers correction mechanisms when deviations indicate air bubble interference, creating a closed-loop control system that maintains measurement accuracy.
2Measurement precision
If air bubble detection and correction mechanisms are implemented, then measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The controller component performs multiple functions: it monitors flow sensing outputs, detects air bubbles based on output characteristics, determines whether bubbles satisfy predetermined conditions, and initiates correction procedures. By consolidating these diverse functions into a single multi-functional controller, the system improves measurement accuracy without proportionally increasing overall device complexity.
Solution Approach 2:
The system uses its existing flow sensing component outputs to detect air bubbles, rather than requiring entirely separate detection sensors. The controller leverages data already being collected for flow measurement purposes, allowing it to perform air bubble detection and correction using resources already allocated for primary measurement functions.
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 effectively detects and accounts for air bubbles, ensuring accurate flow rate measurements by initiating a bubble dwell timer and generating indications when air bubbles exceed permissible dwell times, thereby improving measurement precision.
Implementation Method 1
using temperature sensors positioned upstream and downstream of a heating element to determine air bubble conditions
Data Source
AI summary
Methods, apparatuses, and computer program products associated with flow sensing devices are provided. An example flow sensing device may comprise a controller component in electronic communication with a flow sensing component that is configured to: monitor at least one flow sensing component output, detect an air bubble at a location adjacent a surface of the flow sensing component based at least in part on the at least one flow sensing component output, and determine whether the air bubble satisfies an air bubble condition defining one or more predetermined characteristics.