Transistor-Based Fluid Velocity Sensor Unit
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Solution Overview
Problem
Existing fluid measurement technologies, such as thermoelectric anemometers, rely on expensive precision components and complex electronic controllers, making them costly and inefficient for accurate velocity and volume flow rate measurements.
Innovation Solution
A fluid velocity or volume flow rate sensor unit utilizing a heating element formed by a part of a transistor, with a circuit that maintains a constant temperature difference between the transistor and a reference temperature, allowing for efficient and accurate measurements without expensive components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If thermoelectric anemometers with precision components are used, then measurement accuracy is improved, but device cost and complexity increase
Solution Approach 1:
The patent replaces expensive precision components with inexpensive standard transistors that can be easily replaced. The transistor-based heating element achieves sufficient measurement accuracy without requiring costly precision components, embodying the principle of using cheap, easily replaceable objects to reduce system complexity and cost.
Solution Approach 2:
The patent substitutes mechanical/thermal precision components with electronic transistor-based heating elements. The transistor's electrical characteristics provide stable heating functionality without requiring precision mechanical assembly or expensive materials, thereby reducing device complexity while maintaining measurement accuracy.
2Measurement precision
If thermoelectric anemometers with precision components are used, then measurement accuracy is improved, but manufacturing cost increases
Solution Approach 1:
The patent uses inexpensive standard transistors instead of expensive precision components, dramatically reducing manufacturing cost. The transistor-based heating element can be manufactured using standard semiconductor processes, making the sensor economically viable for mass production while maintaining adequate measurement accuracy.
Solution Approach 2:
The patent changes the fundamental parameter of the heating element from precision-engineered thermal components to electronically-controlled transistor-based heating. This parameter change enables the use of standard manufacturing processes and inexpensive materials, significantly reducing production costs while achieving the required measurement precision through electronic control.
3Measurement precision
If constant temperature anemometry with heating elements and measuring resistors is used, then fluid velocity measurement is achieved, but device complexity and cost increase
Solution Approach 1:
The patent merges the heating element and measuring functions into a single transistor component. The transistor serves both as the heating element (through its electrical resistance) and as the sensing element (through its electrical characteristics), eliminating the need for separate heating elements and measuring resistors, thereby simplifying the circuit while maintaining measurement accuracy.
Solution Approach 2:
The transistor in the patent performs multiple functions: it acts as the heating element, the sensing element, and part of the measurement circuit. This multi-functionality reduces the overall device complexity by eliminating the need for separate dedicated components for each function, while still achieving accurate fluid velocity measurement through constant temperature anemometry.
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 proposed solution enables efficient and accurate fluid velocity and volume flow rate measurements at a lower cost, using inexpensive transistor-based heating elements and simple circuitry, thus overcoming the limitations of existing technologies.
Implementation Method 1
The electrically supplied thermal power is in part transported away by a flow as thermal power loss. As the flow velocity increases, the thermal loss also increases.
Implementation Method 2
The electrically supplied thermal power is in part transported away by a flow as thermal power loss. As the flow velocity increases, the thermal loss also increases.
Data Source
AI summary
A fluid velocity sensor unit (10) and/or fluid volume flow rate sensor unit has at least one heating element (12) which can be arranged in a fluid line (14). The heating element is formed at least by a part of a first transistor (16).