SBT Pixel Temperature Change Detection Without Cooling
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Solution Overview
Problem
Ferroelectric pixel elements made from materials other than strontium tantalate (SBT) face challenges in accurately monitoring thermal radiation due to Curie temperature being close to ambient room temperature, leading to inaccurate readings unless thermally stabilized by a cooling device.
Innovation Solution
A method and system that determine the change in temperature of SBT pixel elements by measuring surface charge due to spontaneous polarization at different times, using a capacitor and microprocessor to calculate and store the temperature change, eliminating the need for thermal stabilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If ferroelectric pixel elements made from materials other than strontium tantalate are used, then manufacturing cost and ease of fabrication are improved, but the Curie temperature is relatively close to ambient room temperature, causing inaccurate thermal radiation monitoring when ambient temperature changes exceed the Curie temperature
Solution Approach 1:
The patent changes the operating parameter from absolute temperature monitoring to temperature change monitoring. By measuring only the change in temperature (ΔT) rather than the absolute temperature, the system can accurately detect thermal radiation-induced temperature changes even when the ambient temperature fluctuates near the Curie point, thereby maintaining monitoring accuracy without requiring the material Curie temperature to be far above ambient conditions
Solution Approach 2:
The patent implements a feedback mechanism where the system continuously monitors the temperature change of the ferroelectric pixel element and uses this information to compensate for ambient temperature effects. The microprocessor measures voltage changes, calculates temperature changes, and stores this data to provide feedback that maintains accurate thermal radiation detection despite ambient temperature variations
2Reliability
If thermal stabilization is implemented using a thermo-cooling device, then thermal radiation monitoring accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts the thermal stabilization function from a separate thermo-cooling device and integrates it into the signal processing system. Instead of physically cooling the pixel element to maintain stability, the system mathematically compensates for temperature effects by measuring voltage changes and calculating temperature-induced charge variations, thereby eliminating the need for complex thermal stabilization hardware
Solution Approach 2:
The patent replaces the mechanical/physical thermal stabilization system (thermo-cooling device) with an electrical/software-based solution. The microprocessor measures voltage across the capacitor, calculates temperature changes based on the relationship between voltage, charge, and temperature coefficient, and processes the data to maintain monitoring accuracy without any physical cooling 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
Enables accurate temperature change detection in SBT pixel elements without requiring a thermo-cooling device, maintaining operational accuracy below ambient room temperature.
Implementation Method 1
determining a first value indicating an amount of surface charge of the SBT pixel element due to a spontaneous polarization of the SBT pixel element
Implementation Method 2
Ferroelectric pixel elements have been constructed from materials, other than strontium tantalate (SBT), to detect thermal radiation
Data Source
AI summary
A system and a method for determining a change of temperature of a SBT pixel element are provided. The method includes determining a first value indicating an amount of surface charge of the SBT pixel element due to a spontaneous polarization of the SBT pixel element at a first time. The method further includes determining a second value indicating an amount of surface charge of the SBT pixel element due to a spontaneous polarization of the SBT pixel element at a second time. The method further includes determining a third value proportional to a difference between the first value and the second value. The method further includes determining a fourth value indicative of the change of temperature of the SBT pixel element based on the third value. The method further includes storing the fourth value indicative of the change of temperature of the SBT pixel element in a memory device.