Multi-Function Metal Sensor Layer for Space-Limited Environmental Sensing
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Solution Overview
Problem
Incorporating environmental sensors such as ambient light sensors, image sensors, and microphones into electronic devices is challenging due to space constraints.
Innovation Solution
Integrating a multi-function environmental sensor formed from a layer of metal, such as a resistive thermal device, into the device housing, which can function as an anemometer, thermometer, and/or heat flux sensor by utilizing control circuitry to measure air speed, temperature, and solar radiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple separate environmental sensors are incorporated into the device, then measurement capabilities are improved, but device size increases
Solution Approach 1:
The patent implements a single metal layer structure that serves multiple environmental sensing functions including anemometer, thermometer, bolometer, and heat flux sensor operations. The same physical structure responds differently to various environmental stimuli, eliminating the need for separate dedicated sensors for each measurement type.
Solution Approach 2:
The patent combines multiple sensing functions into one integrated metal layer component. By merging the detection capabilities for air speed, temperature, solar radiation, and heat flux into a single structural element, the design reduces the total component count and space requirements while maintaining comprehensive environmental monitoring.
2Measurement precision
If traditional separate sensors are used for each environmental parameter, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The metal layer is designed to perform multiple sensing functions simultaneously or sequentially. The same structure can measure air speed through convection cooling, temperature through thermal equilibrium, solar radiation through optical absorption variations, and heat flux through thermal conduction differences, providing precise measurements without requiring separate specialized sensors.
Solution Approach 2:
The patent divides the metal layer into different portions with varying optical absorption properties (coated vs. uncoated sections). This segmentation allows different regions of the same component to respond differently to environmental stimuli, enabling multiple measurement capabilities within a single integrated structure and simplifying the overall sensor system.
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 efficient use of space by incorporating multiple sensor functions into the device housing, allowing for accurate measurements of air speed, temperature, and solar radiation without increasing device size.
Implementation Method 1
control circuitry may heat the layer of metal and calculate an air speed based on a decay of the metal temperature
Implementation Method 2
a reference resistor that is internal to the device may be heated by the same amount as the layer of metal, and the decay rates of the layer of metal and reference resistor may be compared to determine the air speed
Implementation Method 3
a first portion of the metal may have a first optical absorption/insulation (e.g., be insulated), while a second portion may have a second optical absorption/insulation (e.g., be uncoated)
Implementation Method 4
To operate as a heat flux sensor, multiple layers of different metals may be used, and Seebeck voltages between the different metals may be measured
Data Source
AI summary
An electronic device may include an environmental sensor. In particular, the sensor may include a layer of metal and be operable as an anemometer, a thermometer, a bolometer, and/or a heat flux sensor. To operate as an anemometer or thermometer, circuitry may heat the layer of metal and calculate an air speed based on a decay of the metal temperature. To operate as a bolometer, a first portion of the metal may have a first optical absorption/insulation (e.g., be insulated), while a second portion may have a second optical absorption/insulation (e.g., be uncoated). Differences in heating/cooling of the first and second portions may be used to measure solar radiation. To operate as a heat flux sensor, different metals may be used, and Seebeck voltages between the different metals may be measured. The metal may be deposited on the housing or may be incorporated into a mesh on the device.