Electromagnetic Wave Sensor Arms with Variable Cross-Section
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Solution Overview
Problem
Existing electromagnetic wave sensors face challenges in achieving high accuracy and efficient electromagnetic wave absorption while minimizing heat conduction from the arms, which are necessary for effective temperature detection.
Innovation Solution
A structure body with a thermistor element and arms where the thermistor element is suspended between two substrates, with the arms having a larger surface area on one side facing the substrate and a smaller area on the opposite side, incorporating insulating films and a wiring layer to reduce heat conduction and enhance electromagnetic wave absorption through an interference absorption structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the arms are thinned to enhance heat insulating properties between the thermistor element and surrounding parts, then thermal insulation is improved, but efficiency of absorption of electromagnetic waves in the arms deteriorates
Solution Approach 1:
The arm structure employs different cross-sectional areas at different locations: a larger cross-sectional area near the substrate for effective electromagnetic wave absorption, and a thinner cross-sectional area near the thermistor element for reduced heat conduction. This local variation in geometry allows the arm to simultaneously optimize both electromagnetic wave absorption efficiency and thermal insulation performance.
Solution Approach 2:
The arm transitions from a uniform one-dimensional structure to a variable cross-section structure where the area changes along its length. This dimensional variation enables the arm to fulfill dual functions: maintaining sufficient bulk for electromagnetic wave interaction while reducing the thermal conduction path to the thermistor element.
2Reliability
If the arms are thinned as much as possible to enhance heat insulating properties, then thermal insulation is improved, but mechanical strength and stability deteriorate
Solution Approach 1:
The arm structure employs different cross-sectional areas at different locations: a larger cross-sectional area near the substrate for effective electromagnetic wave absorption and enhanced mechanical support, and a thinner cross-sectional area near the thermistor element for reduced heat conduction. This local variation in geometry allows the arm to simultaneously optimize both electromagnetic wave absorption efficiency and thermal insulation performance.
3Ease of manufacture
If a symmetric arm structure is used, then manufacturing simplicity is maintained, but electromagnetic wave absorption efficiency is reduced
Solution Approach 1:
The arm structure deliberately employs asymmetric cross-sectional areas along its length, with a larger area near the substrate and a smaller area near the thermistor element. This asymmetric design optimizes electromagnetic wave absorption by providing sufficient bulk in the region where waves are incident, while simultaneously reducing thermal conduction to the thermistor element. The asymmetry is strategically positioned to maximize absorption efficiency without compromising manufacturing feasibility.
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 configuration effectively curbs heat conduction and enhances the efficiency of electromagnetic wave absorption, allowing for highly accurate and sensitive temperature detection in electromagnetic wave sensors.
Implementation Method 1
an electromagnetic wave absorber which covers at least a part of the temperature detection element
Implementation Method 2
infrared rays (electromagnetic waves) incident on the thermistor film are absorbed by the thermistor film or materials around the thermistor film so that the temperature of this thermistor film varies
Implementation Method 3
The electrical resistance of a thermistor film provided in a thermistor element varies in accordance with a variance in temperature of the thermistor film
Implementation Method 4
according to the Stefan-Boltzmann law, there is a correlation between the temperature of a measurement object and infrared rays (radiant heat) discharged from this measurement object due to heat radiation
Data Source
AI summary
The present disclosure includes an electromagnetic wave detector, and a pair of arms that are positioned on both sides with the electromagnetic wave detector interposed therebetween. The electromagnetic wave detector includes a temperature detection element, and electromagnetic wave absorbers which cover at least a part of the temperature detection element. The structure body has a structure in which the electromagnetic wave detector is hung or suspended with respect to a substrate facing the electromagnetic wave detector via the pair of arms. Area of a surface of the pair of arms on a side facing the substrate are larger than area of surface thereof on a side opposite to the side facing the substrate.