Bolometer Infrared Detector Environmental Shielding
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Solution Overview
Problem
Carbon nanotube-based bolometer-type infrared detectors are unstable due to external environmental influences such as oxygen and moisture, causing fluctuations in resistance values unrelated to temperature changes.
Innovation Solution
A laminated structure comprising a first protective film, a light reflective film, and a second protective film is applied to the heat-sensitive element, where the first protective film can be made of metal oxides, nitrides, polyimides, or fluororesins, the light reflective film is a metal film, and the second protective film is made of similar materials, effectively shielding the heat-sensitive element from environmental interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If carbon nanotubes are used as heat-sensitive elements, then the temperature coefficient of resistance is improved, but the stability of resistance value deteriorates due to electrical doping with oxygen and moisture
Solution Approach 1:
The patent applies the inert atmosphere principle by creating a protective environment around the carbon nanotube heat-sensitive element. A protective film is formed over the carbon nanotubes to exclude oxygen and moisture from the atmosphere, preventing electrical doping while maintaining the high temperature coefficient of resistance property of carbon nanotubes.
Solution Approach 2:
The patent uses an intermediary approach by introducing a protective film as a mediator between the carbon nanotube heat-sensitive element and the external environment. This protective film acts as a barrier that prevents direct contact between oxygen and moisture and the carbon nanotubes, thereby stabilizing the resistance value while allowing the element to function.
2Reliability
If protective films are added to protect the heat-sensitive element, then the stability of resistance value is improved, but the device complexity increases
Solution Approach 1:
The patent applies the flexible shells and thin films principle by using a thin protective film to shield the carbon nanotube heat-sensitive element. This thin film provides effective protection against environmental factors while adding minimal structural complexity, maintaining the overall simplicity of the bolometer device.
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 stabilizes the resistance value of the bolometer-type infrared detector, reducing fluctuations caused by external environments and ensuring consistent operation.
Implementation Method 1
a light reflective film is a metal film
Implementation Method 2
changes the temperature of the light-receiving part by absorbing incident infrared rays
Implementation Method 3
detects the radiation intensity of the infrared rays from changes in resistance due to temperature changes of the material
Data Source
AI summary
To provide a bolometer-type infrared detector whose resistance value is not easily influenced by the external environment and which operates stably, and a method for manufacturing the same.A bolometer-type infrared detector having a laminated structure in which a first protective film, a light reflective film and a second protective film are provided in this order on a heat-sensitive element, whereinthe first protective film is made of at least one selected from the group consisting of a metal oxide film, a metal nitride film, a polyimide, an acrylic resin and a fluororesin;the light reflective film is a metal film; andthe second protective film is made of at least one selected from the group consisting of a metal oxide film, a metal nitride film, a polyimide, an acrylic resin, and a fluororesin.