Thermal Needle Probe Transient Measurement
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Solution Overview
Problem
Conventional methods for measuring thermal conductivity, such as the steady-state hot plate method or heat flow meter method, are inefficient as they require large samples and lengthy measurement times.
Innovation Solution
A thermal needle probe comprising a heater, cooler, temperature measuring element, and heat conduction element, which uses a processor to determine thermal properties by analyzing temperature raising and dropping curves, allowing for rapid and accurate measurement of thermal conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional steady-state hot plate method or heat flow meter method is used, then thermal conductivity can be accurately measured, but measurement time is lengthy and sample size must be large
Solution Approach 1:
The patent transitions from steady-state measurement to transient measurement by introducing time-varying temperature conditions. The heater applies a time-dependent heat input and the system measures temperature response during the transient process, fundamentally changing the measurement parameter from static to dynamic, thereby reducing measurement time while maintaining accuracy
Solution Approach 2:
The patent divides the measurement process into distinct phases: heating phase, cooling phase, and data analysis phase. The transient response curves are segmented into different regions (initial transient, steady-state, and cooling portions) that can be analyzed separately to extract thermal properties, enabling faster measurement compared to conventional continuous steady-state methods
2Measurement precision
If conventional steady-state hot plate method or heat flow meter method is used, then thermal conductivity can be accurately measured, but sample size must be large
Solution Approach 1:
By changing from steady-state to transient measurement parameters, the patent enables accurate thermal conductivity determination with smaller samples. The transient thermal response contains sufficient information about material properties that can be extracted from smaller volumes, eliminating the requirement for large sample sizes needed in conventional steady-state methods
Solution Approach 2:
The patent moves from two-dimensional steady-state heat flow measurement to one-dimensional transient heat conduction measurement along the needle probe axis. This dimensional simplification allows for more efficient heat transfer and reduced sample volume requirements while maintaining measurement accuracy through time-resolved temperature data
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 thermal needle probe enables efficient measurement of thermal conductivity by shortening the initial transient and steady curves, elongating the linear segments, and reducing overall measurement time, providing accurate and precise thermal property determination.
Implementation Method 1
The heater is configured to heat an object
Implementation Method 2
The cooler is configured to cool the object
Implementation Method 3
The heat conduction element is configured to conduct heat between the heater and the object
Data Source
AI summary
According to embodiments of the disclosure, a thermal needle probe is provided. The thermal needle probe may include a heater, a cooler, a temperature measuring element, a heat conduction element and a processor. The heater is configured to heat an object. The cooler is configured to cool the object. The temperature measuring element is configured to measure a temperature raising curve of the object and a temperature dropping curve of the object. The heat conduction element is configured to conduct heat between the heater and the object. The processor is configured to determine a thermal property of the object according to at least one of the temperature raising curve and the temperature dropping curve.