Thermo-Optical Array Devices with Oriented TiO2 Layers
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Solution Overview
Problem
Un-cooled bolometer camera designs, particularly those using vanadium dioxide (VO2) material, are inoperable or difficult to operate in ambient environments due to their optical transition temperature of 67 degrees Celsius, which is higher than typical room temperature, leading to high costs and performance issues.
Innovation Solution
A thermo-optical array device is developed by forming an oriented titanium dioxide material on a bolometer material, followed by a vanadium dioxide material, which reduces the optical transition temperature to less than 67 degrees Celsius, making the device operable in ambient environments such as room temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vanadium dioxide (VO2) material is used in bolometer pixels, then the device achieves high performance infrared detection capability, but the optical transition temperature of 67 degrees Celsius makes the device inoperable or difficult to operate in ambient environments
Solution Approach 1:
The patent applies parameter changes by modifying the optical transition temperature of the VO2 material from 67 degrees Celsius to below 67 degrees Celsius through compositional adjustments and processing techniques, enabling the device to operate reliably in ambient environments
Solution Approach 2:
The patent uses composite materials by combining VO2 with other materials such as titanium dioxide (TiO2) in a layered structure, where the composite achieves both the desired optical transition temperature and high performance infrared detection capability
2Ease of manufacture
If un-cooled bolometer camera designs are implemented, then cost is reduced compared to cooled systems, but the high optical transition temperature of 67 degrees Celsius limits operational viability in ambient conditions
Solution Approach 1:
By changing the optical transition temperature parameter from 67 degrees Celsius to below 67 degrees Celsius, the patent enables un-cooled bolometer cameras to operate in ambient environments, simultaneously achieving cost-effectiveness and environmental adaptability
Solution Approach 2:
The patent applies local quality by creating regions with different material compositions and properties within the bolometer pixel structure, allowing different areas to optimize for both low-cost manufacturing and ambient temperature operation
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 enables thermo-optical array devices to function effectively in ambient environments by lowering the optical transition temperature to approximately 20 degrees Celsius, improving operational viability and reducing costs associated with high-temperature inoperability.
Implementation Method 1
the temperature at which a change in the optical transmission of the VO2 material occurs
Implementation Method 2
creates a change in the temperature of a 'temperature sensing film' which can be fabricated in part from a vanadium oxide (VOx) material
Implementation Method 3
interrogates each pixel for a resistance change produced by the temperature increase caused by absorbed long wavelength infrared (LWIR) target radiation
Implementation Method 4
forming an (001) oriented titanium dioxide material on a bolometer material, and forming a vanadium dioxide material on the (001) oriented titanium dioxide material
Data Source
AI summary
Thermo-optical array devices and methods of processing thermo-optical array devices are disclosed. One method of processing thermo-optical array devices includes forming a (001) oriented titanium dioxide material on a bolometer material, and forming a vanadium dioxide material on the (001) oriented titanium dioxide material. One thermo-optical array device includes a bolometer material, a titanium dioxide material on the bolometer material, and a vanadium dioxide material on the titanium dioxide material, wherein the vanadium dioxide material has an optical transition temperature of less than 67 degrees Celsius.