Thermal Cycle Detector With Self-Powered Irreversible Recording
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Solution Overview
Problem
Current thermal cycle detection technologies lack the ability to accurately record and monitor thermal cycles without external power or electronic memory, and are limited in detecting non-monotonic thermal profiles, which is crucial for assessing the remaining useful life of devices and warranty conditions.
Innovation Solution
The development of thermal cycle detectors that utilize semiconductor materials and transistors to detect thermal cycles by undergoing irreversible changes in response to temperature and electrical bias, generating a record of detected cycles that is substantially unalterable, and capable of ignoring cycles below a minimum temperature or duration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current thermal cycle detection technologies are used, then thermal cycles can be detected, but they require external power sources or electronic memory and cannot accurately record non-monotonic thermal profiles
Solution Approach 1:
The transistor structure performs self-recording of thermal cycles through irreversible dopant diffusion that occurs automatically when threshold temperature is reached, eliminating the need for external power sources or electronic memory systems
Solution Approach 2:
The patent replaces electronic recording systems with a physical/chemical mechanism where dopant diffusion in the semiconductor crystal lattice creates permanent, readable records of thermal exposure without requiring electronic components
2Measurement precision
If transistors are subjected to elevated temperature and electrical bias, then irreversible changes occur that detect thermal cycles, but the transistor characteristics are permanently altered
Solution Approach 1:
The patent converts the harmful effect of thermal degradation into a beneficial recording mechanism, where the irreversible alteration of transistor characteristics due to high temperature exposure becomes the very mechanism that records and detects the thermal cycle event
Solution Approach 2:
The patent uses changes in electrical characteristics (analogous to color changes) of the transistor as a visible/measureable indicator of thermal exposure, where the transistor's electrical properties change in response to temperature and serve as a record of the thermal event
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 and reliable detection of thermal cycles, including non-monotonic profiles, without external power, providing a durable record of thermal exposure for various applications, such as integrated circuits and medical instruments.
Implementation Method 1
each transistor is configured to undergo an irreversible change in response to the transistor being subjected to a minimum threshold temperature required for a thermal event to be detected as a thermal cycle
Implementation Method 2
a first electrical conductor spanning the first thermal barrier and configured to detect a temperature difference between the first and second temperature reservoirs
Data Source
AI summary
A thermal cycle detector includes a first temperature reservoir, a second first temperature reservoir, first thermal barrier, and a plurality of first electrical conductors spanning the first thermal barrier. The first temperature reservoir includes a first transistor, and the second temperature reservoir includes a second transistor. The first thermal barrier is disposed between the first temperature reservoir and the second temperature reservoir. The plurality of first electrical conductors is configured to provide an electrical power source for the thermal cycle detector in response to a thermal gradient across the plurality of first electrical conductors.