Temperature Sensor Assembly With Low-Conductivity Rod for Airflow Accuracy
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Solution Overview
Problem
Temperature sensors installed in air ducts with dynamic airflow experience thermal conduction errors due to significant temperature gradients, leading to reduced accuracy and instability in airflow and thermal hysteresis measurements.
Innovation Solution
A temperature sensor assembly featuring a low thermal conductivity rod positioned between the sensing elements and the body, combined with high thermal conductivity potting, to minimize thermal conduction and maintain accuracy across varying ambient temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a temperature sensor assembly is installed in an air duct with dynamic airflow, then the sensor can measure airflow and temperature, but thermal conduction errors occur due to significant temperature gradients between the ambient environment and the sensor housing, reducing measurement accuracy
Solution Approach 1:
A rod made of low thermal conductivity material (such as ceramic or plastic) is introduced as an intermediary component between the sensor housing and the sensing element. This intermediary rod blocks the thermal conduction path from the temperature-gradient-exposed housing to the sensing element, while still allowing mechanical support and electrical connection. The rod's low thermal conductivity ensures that minimal heat is conducted along it, thereby eliminating thermal conduction errors and improving temperature measurement accuracy.
2Device complexity
If the sensor housing is directly connected to the sensing element, then the structure is simple, but thermal conduction through the housing causes measurement errors in dynamic airflow conditions
Solution Approach 1:
The rod serves as a mediating component that provides both mechanical support and thermal isolation. It connects the sensor housing to the sensing element structurally while its low thermal conductivity material property prevents thermal conduction. This simple addition of an intermediary component resolves the contradiction by maintaining structural integrity while eliminating thermal conduction errors, thereby improving measurement precision without significantly increasing device complexity.
3Speed
If high thermal conductivity material is used for the rod, then thermal equilibrium is achieved quickly, but thermal conduction errors increase due to temperature gradients in the ambient environment
Solution Approach 1:
The patent applies different thermal conductivity properties to different parts of the sensor assembly. The rod, which is in direct contact with the sensing element and exposed to ambient temperature gradients, is made of low thermal conductivity material to prevent thermal conduction errors. Meanwhile, the potting material surrounding the sensing element is made of high thermal conductivity material to ensure rapid thermal equilibrium between the sensing element and the local environment. This local differentiation of material properties resolves the contradiction by optimizing each component's thermal characteristics for its specific functional requirement.
Solution Approach 2:
The patent changes the thermal conductivity parameter of the rod material from high to low to eliminate thermal conduction errors. By selecting materials with appropriately different thermal conductivity parameters for the rod and potting, the system optimizes both thermal isolation and thermal equilibrium functions. The low thermal conductivity parameter of the rod prevents heat transfer along the housing, while the high thermal conductivity parameter of the potting ensures rapid thermal response at the sensing element, thereby resolving the contradiction between thermal equilibrium speed and measurement stability.
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 assembly effectively insulates sensing elements from thermal conduction, ensuring accurate temperature readings by minimizing thermal dispersion and maintaining stability across different airflow conditions.
Implementation Method 1
a rod at least partially disposed in the probe housing between the one or more sensing elements and the body, wherein the rod is formed of a low thermal conductivity material
Implementation Method 2
a high thermal conductivity potting around the plurality of sensing elements
Data Source
AI summary
Provided is a sensor assembly including a body, and a probe assembly configured to be coupled to the body, the probe assembly including a probe housing, one or more sensing elements disposed in the probe housing, and a rod at least partially disposed in the probe housing between the one or more sensing elements and the body, wherein the rod is formed of a low thermal conductivity material.