Dual-Element Sensor Switching for Temperature-Stable Detection
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Solution Overview
Problem
Existing MEMS sensors face challenges in maintaining stable detection due to excessive changes in detection characteristics caused by temperature fluctuations, which affect sensor lifetime and accuracy.
Innovation Solution
The sensor employs a dual detection system with alternating current supply to two conductive members, where one member serves as a reference in each operation, reducing the frequency and duration of temperature changes, thereby stabilizing detection characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single detection element is used in MEMS sensors, then the device complexity is reduced, but the detection stability deteriorates due to excessive changes in detection characteristics caused by temperature fluctuations
Solution Approach 1:
The sensor is divided into multiple detection elements (first detection element and second detection element) with separate heating portions and detection portions. Each element can be independently controlled and measured, allowing differential measurement techniques to compensate for temperature effects while maintaining manageable device complexity.
Solution Approach 2:
The patent applies different operating parameters to different detection elements - specifically, alternating current supply patterns where one element is heated while the other is measured, and vice versa. This parameter variation enables temperature compensation by comparing measurements taken under different thermal conditions.
2Measurement precision
If current is continuously supplied to the detection element, then the detection sensitivity is improved, but the temperature fluctuations increase causing detection characteristic changes
Solution Approach 1:
The patent implements periodic switching between two detection elements, where current is supplied to one element while the other is measured, then alternates. This periodic action allows the sensor to maintain detection sensitivity through continuous operation while preventing excessive temperature buildup in any single element by giving it rest periods.
Solution Approach 2:
The second detection element serves as an intermediary reference when the first element is being heated, and vice versa. This intermediary element provides a stable measurement reference that is not affected by the heating process, enabling temperature compensation and maintaining detection precision despite temperature fluctuations in the active element.
3Productivity
If the sensor operates for an extended period, then the productivity is improved, but the detection characteristics drift due to accumulated temperature changes affecting sensor lifetime
Solution Approach 1:
The patent implements a measurement sequence where one detection element is used for measurement while the other is heated, then they are switched. This allows the measured element to cool down and recover its baseline characteristics between measurement cycles, preventing accumulated temperature drift and maintaining detection accuracy over extended operational periods.
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 maintains high accuracy and extends the sensor's lifespan by minimizing changes in detection characteristics, enabling stable and precise detection over an extended period.
Implementation Method 1
a first detection element... including a first conductive member and a first resistance member... output a first signal corresponding to a difference between a first electrical resistance of the first resistance member and a second electrical resistance of a second resistance member
Data Source
AI summary
According to one embodiment, a sensor includes a detection device, a switch circuit, and a detection circuit. The detection device includes a first detection section and a second detection section. The first detection section includes a first detection element. The first detection element includes a first conductive member and a first resistance member. The second detection section includes a second detection element. The second detection element includes a second conductive member and a second resistance member. In a first operation, the switch circuit is configured to supply a first current to the first conductive member and not to supply the first current to the second conductive member, and the detection circuit is configured to output a first signal corresponding to a difference between a first electrical resistance of the first resistance member and a second electrical resistance of the second resistance member.