Thermopile Phase Transition Rate Measurement
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Solution Overview
Problem
Existing methods for measuring the transition rate between solid or liquid and gaseous phases of materials, such as water, are often indirect, time-consuming, and sensitive to external conditions.
Innovation Solution
A method and device utilizing a thermopile to measure the temperature difference at the interface due to latent heat, generating a thermoelectric voltage that represents the transition rate, allowing for direct and reliable measurement of the transition rate between phases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If indirect measurement methods (e.g., atmospheric humidity sensors) are used to determine transition rate, then measurement can be performed, but measurement time increases and sensitivity to external conditions increases
Solution Approach 1:
The patent replaces indirect mechanical/electrical measurement systems (humidity sensors, porometers) with a direct thermal measurement system using a thermopile. The thermopile directly detects temperature differences at the phase interface caused by latent heat, providing immediate transition rate information without the time delays and external condition sensitivities of indirect methods.
Solution Approach 2:
The patent introduces temperature difference as an intermediary parameter that directly reflects the phase transition process. By measuring the temperature difference at the interface (caused by latent heat), the system obtains direct information about the transition rate without needing to indirectly infer it from concentration changes or humidity gradients.
2Measurement precision
If indirect measurement methods are used, then measurement can be performed, but reliability decreases due to sensitivity to external conditions
Solution Approach 1:
The patent replaces indirect measurement systems that are sensitive to external conditions with a direct thermal measurement system. The thermopile measures temperature differences caused by latent heat at the phase interface, which are intrinsic to the transition process itself and not influenced by external environmental factors, thereby improving reliability.
Solution Approach 2:
The measurement system uses the latent heat of the phase transition itself as the measurement signal. The temperature difference generated by the transition process is directly measured, making the system self-referential and immune to external condition variations, thus enhancing reliability.
3Reliability
If direct measurement at interface area is implemented, then measurement reliability improves, but device complexity increases
Solution Approach 1:
The patent exploits the phase transition phenomenon itself (latent heat release/absorption at the interface) as the measurement basis. By positioning the thermopile at the phase interface, the system directly measures the thermal effect of the transition, achieving reliable measurement without complex additional apparatus.
Solution Approach 2:
The patent uses temperature difference as an intermediary that directly connects to the phase transition process. This intermediary approach allows direct measurement at the interface without requiring complex direct observation of the phase change itself, simplifying the device while maintaining reliability.
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
Enables efficient, direct, and reliable measurement of transition rates by detecting low temperature differences with a thermopile composed of multiple conductor transitions, facilitating calibration-free comparisons and determination of pressure potentials and permeability.
Implementation Method 1
They use the thermoelectric effect for temperature measurement... The sum of the partial voltages generated by the individual thermoelements can be tapped between the two ends of the thermopile as a thermoelectric voltage
Implementation Method 2
a measurement of the temperature difference that exists at the interface area between the phases due to a latent heat (evaporation or condensation heat and/or sublimation or resublimation heat) of the phase transition
Data Source
AI summary
A method and a device for measuring a transition rate between a first phase of a material and a second phase of the material wherein the material is solid or liquid in the first phase and gaseous in the second phase. A thermopile which includes a plurality of conductor transitions at an interface area between the first and second phases. The thermopile has a first portion which includes every second one of the conductor transitions, and a second portion that includes the remaining conductor transitions. In addition, the method includes measuring a thermoelectric voltage that is applied on the thermopile and that represents a temperature difference between the first and second portions of the thermopile.