Thermal Actuator Infrared Sensor Beam Deformation
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Solution Overview
Problem
Existing infrared radiation detectors, particularly thermal IR detectors, face challenges in achieving high sensitivity and compactness while being insensitive to ambient temperature variations, and often require complex cooling systems in photonic detectors.
Innovation Solution
A flexible beam connected between two anchors on a substrate, with a plate that absorbs infrared radiation and transfers heat to the beam, causing it to deform and move, allowing for electrical or optical detection of the radiation, utilizing a common layer of material for the beam, anchors, and plate to enhance sensitivity and reduce temperature sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If photonic IR detectors are used to achieve high sensitivity, then detection precision is improved, but device complexity increases due to required cooling systems
Solution Approach 1:
The patent extracts and eliminates the cooling system from the detector design by using thermal detectors that operate at ambient temperatures. The solution takes out the problematic cooling infrastructure while retaining high detection precision through thermal detection mechanisms that convert IR radiation directly to heat and then to electrical signals.
Solution Approach 2:
The patent replaces the mechanical cooling system with a thermal detection mechanism. Instead of using cryogenic cooling to achieve detection precision, the invention uses thermal absorption and conversion processes that naturally occur at ambient temperatures, substituting complex mechanical cooling infrastructure with simpler thermal physics-based detection.
2Ease of manufacture
If thermal IR detectors are used to reduce device complexity, then ease of manufacture is improved, but measurement precision deteriorates compared to photonic detectors
Solution Approach 1:
The patent employs composite material structures in the detector design, combining different materials with complementary properties to enhance detection precision while maintaining thermal operation. The composite structure allows for optimized thermal absorption, heat conduction, and electrical signal generation, achieving high precision without complex cooling systems.
Solution Approach 2:
The patent optimizes detection precision by carefully controlling and changing physical parameters such as thermal conductivity, heat capacity, and material composition. By adjusting these parameters, the detector achieves high sensitivity to IR radiation while operating at ambient temperatures, bridging the gap between ease of manufacture and measurement precision.
3Measurement precision
If thermal expansion of the beam is used to detect IR radiation, then sensitivity to IR radiation is improved, but sensitivity to ambient temperature fluctuations increases
Solution Approach 1:
The patent segments the detector into distinct functional components: an IR-absorbing element, a thermal isolation structure, and a detection element. This segmentation allows the IR-absorbing portion to respond to IR radiation while the thermal isolation prevents ambient temperature fluctuations from affecting the measurement, thereby maintaining sensitivity to IR radiation while reducing sensitivity to ambient temperature changes.
Solution Approach 2:
The patent introduces a thermal isolation structure as an intermediary between the IR-absorbing element and the environment. This intermediary blocks heat transfer from ambient temperature fluctuations while allowing thermal signals from IR radiation to pass through to the detection element, effectively filtering out harmful thermal noise while preserving useful IR signals.
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 solution provides a high sensitivity to infrared radiation with reduced sensitivity to ambient temperature fluctuations, enabling the creation of compact and efficient infrared sensors suitable for imaging applications, and can be integrated into sensor arrays.
Implementation Method 1
a plate mechanically coupled to the first flexible beam and adapted to absorb incident radiation
Implementation Method 2
The plate is adapted to transfer heat generated due to said absorption to the first flexible beam
Implementation Method 3
cause the first flexible beam to deform
Data Source
AI summary
In one embodiment, an infrared (IR) sensor has a flexible beam connected between two anchors supported on a substrate. The beam is mechanically coupled to a plate that has an IR-absorbing layer and is adapted to transfer the IR-induced heat to the beam. The heat transfer causes the beam to deform and move the plate with respect to the substrate. The motion of the plate is detected electrically or optically to quantify the amount of IR radiation received by the plate. The beam, anchors, and plate are formed from a planar layer of material that is supported at a specified offset distance from the substrate. During fabrication, certain portions of the planar layer are removed to define the beam, anchors, and plate.