Thermocouple Junction Arrangement for Temperature Sensing
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Solution Overview
Problem
Current temperature sensing devices using thermocouples face limitations in accurately measuring temperatures at multiple locations due to overlapping junction positions and material compatibility issues, leading to potential de-calibration over time.
Innovation Solution
The proposed temperature sensing device employs a plurality of thermocouple arrangements with forward and return conductors of different materials, where electrical junctions are arranged in an alternating pattern along the longitudinal direction, ensuring distinct positions and minimizing overlap, and is housed in a compatible case with an insulating matrix and protective sheath to maintain stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple thermocouple arrangements are used to measure temperatures at multiple locations, then measurement capability is improved, but junction overlap occurs leading to measurement errors
Solution Approach 1:
The patent applies dimensional arrangement by distributing thermocouple junctions across different longitudinal positions along the forward conductors. Instead of having all junctions at the same location, they are spaced at different positions (e.g., first junction at position x1, second junction at position x2), effectively using the longitudinal dimension to separate junctions and eliminate overlap interference.
2Device complexity
If thermocouples are arranged within a sheath with electrical insulation material, then structural integration is improved, but material compatibility issues cause de-calibration over time
Solution Approach 1:
The patent changes the material parameter of the insulation material from conventional options to PTFE (polytetrafluoroethylene). This material substitution is driven by its superior chemical inertness and temperature stability, which prevent reactive interactions with the conductor materials even at elevated temperatures, thereby maintaining calibration accuracy over time.
Solution Approach 2:
The patent employs a composite structure consisting of multiple materials with specific properties: PTFE insulation material combined with stainless steel or Inconel sheath, and specific conductor material pairings. This composite approach ensures chemical compatibility and thermal stability throughout the assembly, preventing de-calibration.
3Ease of manufacture
If conventional insulation materials are used in the sheath, then ease of manufacture is improved, but chemical reactivity causes de-calibration
Solution Approach 1:
The patent changes the material parameter of the insulation material from conventional options to PTFE (polytetrafluoroethylene). This material substitution is driven by its superior chemical inertness and temperature stability, which prevent reactive interactions with the conductor materials even at elevated temperatures, thereby maintaining calibration accuracy over time.
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
This configuration enhances the accuracy and reliability of temperature measurement by preventing junction overlap and ensuring material compatibility, thereby reducing de-calibration and improving mechanical and chemical stability.
Implementation Method 1
A thermocouple produces a temperature-dependent voltage as a result of the thermoelectric effect, and this voltage can be interpreted to measure temperature.
Data Source
AI summary
The present disclosure relates to a temperature sensing device having a plurality of thermocouple arrangements, each of the thermocouple arrangements having a forward conductor and a plurality of return conductors electrically connected with the forward conductor, the return conductors having a different conductive material than the respectively associated forward conductor, electrical junctions or groups of electrical junctions of the return conductors to the respectively associated forward conductor being arranged at different longitudinal positions of the respectively associated forward conductor, and consecutive longitudinal positions of the electrical junctions or of groups of the electrical junctions of all thermocouple arrangements in the longitudinal direction of all forward conductors alternating between different forward conductors. Further, the present disclosure relates to a method of producing a temperature sensing device.