Temperature Sensor Calibration System with Fluid Circulation
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Solution Overview
Problem
Existing temperature sensor calibration methods are inadequate due to complex heat transfer issues and temperature gradients, requiring improved systems for accurate and efficient calibration, especially in production facilities where temperature determination is critical.
Innovation Solution
A system comprising an elongate temperature sensor with a thermos element, a receptacle, a controllable energy source, and an elongate fluid directing element to promote fluid circulation, along with a reference thermos element for precise temperature measurement and calibration, using a controller to adjust heat and fluid flow for thermal equilibrium.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the temperature sensor is encapsulated into a structure to fit the production facility, then the sensor can be placed in the desired measuring position, but complex heat transfer occurs involving one or more timescales
Solution Approach 1:
The calibration system is divided into separate functional components: a calibration fluid chamber, a temperature sensor with elongate element, a reference temperature sensor, a heater, and a stirrer. This segmentation allows each component to perform its specific function independently, simplifying the overall heat transfer dynamics during calibration.
Solution Approach 2:
A calibration fluid serves as an intermediary medium between the heater and the temperature sensor. This fluid facilitates controlled heat transfer from the heater to the sensor element, enabling accurate calibration while isolating the complex heat transfer path from the production facility installation requirements.
2Productivity
If calibration is carried out at a single temperature, then the process is simple, but the deviation between sensor read-out and correct temperature may depend on the actual temperature level
Solution Approach 1:
The calibration process uses periodic temperature cycling through multiple temperature points. The controller sequentially sets different temperature setpoints, allowing the system to calibrate at multiple temperatures rather than just one. This periodic temperature variation enables detection of temperature-dependent deviations while maintaining a structured, efficient calibration流程.
Solution Approach 2:
The system continuously monitors the temperature sensor read-outs and compares them against the reference temperature sensor measurements and desired setpoints. This feedback mechanism allows the controller to detect deviations at different temperature levels and adjust the calibration accordingly, ensuring accurate measurement across the entire temperature range.
3Measurement precision
If a reference temperature sensor is placed in the fluid for calibration, then correct temperature read-outs can be obtained, but the system complexity increases
Solution Approach 1:
The calibration system merges the reference temperature sensor with the existing calibration fluid chamber structure. The reference sensor is positioned within the same fluid environment as the temperature sensor being calibrated, allowing direct comparison of readings. This merging approach provides accurate reference measurements without requiring a completely separate calibration apparatus.
4Measurement precision
If the fluid directing element creates circulation passages, then temperature gradients are minimized, but the device complexity increases
Solution Approach 1:
The fluid directing element incorporates a stirrer that creates dynamic circulation of the calibration fluid. This dynamic stirring action continuously moves the fluid through the calibration chamber, minimizing temperature gradients by ensuring uniform temperature distribution. The dynamic approach is more effective than static design, achieving better temperature uniformity despite the added complexity of the circulation mechanism.
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 system ensures accurate calibration by minimizing temperature gradients and providing a reliable method for determining deviations, enabling effective correction and maintaining sensor accuracy over time.
Implementation Method 1
a controllable energy source configured to add to or remove heat from the cavity
Implementation Method 2
an elongate fluid directing element... dimensioned to provide an outer flow passage between an outer surface of the fluid directing element and an inner surface of tubular wall and an inner flow passage at an inner side of the elongate fluid directing element
Implementation Method 3
a reference thermos element arranged to sense the temperature within the cavity
Implementation Method 4
the first end with the thermos element is contained within cavity
Data Source
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AI summary
The invention relates to a system and method for calibrating a temperature sensor. The invention comprise a receptacle comprising a tubular wall closed at a lower end by a bottom thereby defining an open ended cavity configured to hold a liquid and to receive a thermos element. A controllable energy source is provided to add to or remove heat from the cavity, together with an elongate fluid directing element having an upper end and a lower end.