Phase Change Cell Feedback Control for Sensor Temperature Calibration
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Solution Overview
Problem
Climate systems, particularly space-based systems, face accuracy issues due to temperature drift in instruments like temperature sensors, which require frequent calibration to maintain precision, and existing calibration systems are often open-loop, lacking control over temperature stability.
Innovation Solution
A closed-loop feedback system utilizing a phase change cell with a thermal mass and heat transfer device, controlled by a processor to manage energy transfer and maintain precise temperature control, allowing for calibration and control of thermal sensors and components within the climate system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If open-loop calibration systems are used to calibrate temperature sensors, then calibration can be performed, but temperature stability and control over calibration system components cannot be ensured
Solution Approach 1:
The patent implements a closed-loop feedback system where temperature sensors continuously monitor the thermal mass and phase change cell, and the processor adjusts the heat transfer device based on this feedback to maintain stable temperatures during calibration. This feedback mechanism ensures both calibration accuracy and temperature stability, resolving the contradiction between measurement precision and reliability.
Solution Approach 2:
The patent utilizes phase change materials that undergo phase transitions at known temperatures to provide stable reference points for calibration. The phase transition process maintains a constant temperature during the transition, providing a reliable reference that improves both calibration accuracy and temperature stability simultaneously.
2Measurement precision
If frequent calibration is performed to prevent temperature drift, then measurement accuracy is maintained, but system complexity and operational burden increase
Solution Approach 1:
The patent implements a self-calibrating system where the phase change cell automatically provides reference temperatures and the closed-loop feedback system autonomously adjusts temperatures without requiring manual intervention. This self-service capability maintains high measurement precision while reducing operational burden and simplifying the calibration process.
Solution Approach 2:
The patent pre-loads the phase change cell with materials that undergo phase transitions at known reference temperatures. This preliminary preparation allows the system to automatically provide calibration references whenever needed, eliminating the need for complex external calibration equipment and reducing system complexity while maintaining accuracy.
3Measurement precision
If phase change materials are used for calibration, then calibration reference points are provided, but control over the calibration system temperature and stability is lacking
Solution Approach 1:
The patent uses closed-loop feedback where temperature sensors monitor the phase change cell and thermal mass temperatures, and the processor continuously adjusts the heat transfer device to maintain desired temperatures. This feedback control provides both accurate phase change reference points and active temperature control, resolving the contradiction between calibration reference accuracy and temperature control capability.
Solution Approach 2:
The patent implements dynamic control where the heat transfer device can actively adjust its operation based on real-time temperature conditions. This dynamic adjustment capability allows the system to maintain stable temperatures during phase changes and transition between different calibration reference points, providing both accurate references and ease of operation.
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 approach ensures accurate calibration and control of thermal sensors and components, preventing temperature drift and maintaining system stability, thereby enhancing the accuracy and reliability of climate system data.
Implementation Method 1
calibration systems are open-loop systems that simply calibrate a sensor based on the phase change without ensuring stability
Implementation Method 2
The heat transfer device is in thermal communication with the phase change cell and the thermal mass and is configured to transfer energy between the phase change cell and the thermal mass
Data Source
AI summary
A calibration system for a climate system utilizing closed loop feedback and a phase change cell includes controlling a transfer rate of energy between a phase change cell and a thermal mass based on at least a temperature of the thermal mass. The transfer rate is controlled in order to control the temperature of the thermal mass and selectively move a material in the phase change cell through a phase change with transferred energy. In particular, the temperature of the thermal mass is controllable when the material is maintained in the phase change. A thermal sensor in the thermal mass may also be calibrated based on the temperature of a thermal sensor in the phase change cell during a predetermined portion of the phase change.