Self-Powered Thermal Cycle Detection With Irreversible Counting
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Solution Overview
Problem
Existing thermal cycle detectors require external power sources or electronic memory, and are unable to accurately detect a wide range of thermal cycle profiles, including non-monotonic cycles, without altering the recorded data.
Innovation Solution
A thermal cycle detector comprising a first and second temperature reservoir, thermal barriers, and electrical conductors that generate power from a thermal gradient, using P-type and N-type doped polysilicon conductors to track irreversible changes in transistors, allowing detection of thermal cycles without external power or memory.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If external power sources and electronic memory are used in thermal cycle detectors, then the detector can store and process data, but the device complexity and cost increase
Solution Approach 1:
The patent removes external power sources and electronic memory from the thermal cycle detector, retaining only the essential thermal sensing and counting functionality. The detector uses the thermal gradient itself to drive the counting mechanism through thermally-induced carrier generation in the semiconductor material, eliminating the need for separate power supply and storage components.
Solution Approach 2:
The thermal cycle detector utilizes the thermal gradient generated during normal operation to power itself and drive the counting mechanism. The semiconductor material generates carriers thermally-induced, which are then separated by the built-in electric field to produce measurable current, allowing the device to self-power without external energy sources.
2Measurement precision
If the detector uses traditional sensing methods, then it can detect thermal cycles, but it cannot accurately detect non-monotonic thermal cycle profiles
Solution Approach 1:
The patent changes the fundamental detection parameter from temperature magnitude to thermal gradient direction and magnitude. By measuring the direction and magnitude of thermal gradients rather than absolute temperature, the detector can accurately identify thermal cycle boundaries regardless of whether the cycles are monotonic or non-monotonic, achieving both precision and versatility.
3Reliability
If the detector lacks irreversible changes mechanism, then it can respond to thermal cycles, but it cannot provide unalterable recorded data
Solution Approach 1:
The patent implements preliminary irreversible changes in the semiconductor material structure during thermal cycling. The thermal stress and carrier generation during each cycle create permanent modifications to the material's electrical properties, which serve as an irreversible record of the thermal cycle. This built-in memory mechanism ensures data unalterability without requiring external storage components.
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
The detector can accurately count thermal cycles, ignore cycles below a threshold, and record data that is unalterable, suitable for applications in integrated circuits, medical instruments, and various industrial settings.
Implementation Method 1
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
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3B
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.