Bolometer Pixel Trigger with Thermal-Sensitive Film
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Solution Overview
Problem
Bolometer pixels in thermal imaging systems are vulnerable to excessive heat sources, which can degrade their imaging capability and even destroy them, and existing protection methods like thermal shorts and thermochromic switches impair normal performance and have limitations in heat conduction and radiation blocking.
Innovation Solution
A bolometer pixel trigger with a thermal-sensitive film trigger made from resistive varying materials like vanadium oxide, which changes resistance with temperature, and a trigger sense circuit that detects overheating by varying current flow, initiating a protection mechanism such as a mechanical shutter or voltage-controlled window to block excessive thermal energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing protection methods like thermal shorts and thermochromic switches are used, then bolometer pixels are protected from excessive heat, but normal imaging performance is impaired
Solution Approach 1:
The protection function is segmented from the imaging function by using a separate thermal-sensitive film trigger layer that independently detects excessive heat and activates protection mechanisms without interfering with the bolometer's normal imaging operation. The film trigger acts as a separate sensing element that monitors temperature and initiates protection only when thresholds are exceeded.
Solution Approach 2:
A voltage-controlled window or mechanical shutter serves as an intermediary element between the excessive heat source and the bolometer pixel. This intermediary blocks or attenuates thermal radiation only when activated by the thermal-sensitive film trigger, allowing normal imaging to proceed unimpeded while providing protection when needed.
2Reliability
If thermal shorts are used for heat conduction, then excessive heat is dissipated, but heat conduction capability is limited
Solution Approach 1:
The protection mechanism transitions from a static thermal short to a dynamic system where the voltage-controlled window or mechanical shutter can be activated and deactivated based on real-time temperature monitoring by the thermal-sensitive film trigger. This dynamic approach allows heat conduction capability to be maintained during normal operation while providing active heat dissipation only when excessive temperatures are detected.
3Reliability
If thermochromic switches are used for radiation blocking, then excessive thermal energy is blocked, but radiation blocking efficiency is limited
Solution Approach 1:
The system changes the operational parameters of radiation blocking by using a voltage-controlled window that can be precisely controlled to block or transmit radiation based on the temperature signal from the thermal-sensitive film trigger. This provides more efficient and controllable radiation blocking compared to passive thermochromic switches, allowing the blocking efficiency to be optimized based on the actual thermal threat level.
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
Effectively protects bolometer pixels from excessive heat by identifying overheated pixels and initiating thermal mitigation, maintaining imaging performance while preventing damage from high thermal energy sources.
Implementation Method 1
The thermal-sensitive film trigger includes a resistive varying thermal-sensitive material configured to change resistance in response to a change in temperature thereof
Implementation Method 2
Bolometer pixels are used in a wide variety of infrared or thermal imaging applications. When they are exposed to heat sources bolometer pixels change their resistance to provide a measureable signal
Data Source
AI summary
A bolometer pixel trigger including a substrate, a bolometer formed on the substrate, and a thermal-sensitive film trigger. The thermal-sensitive film trigger includes a resistive varying thermal-sensitive material configured to change resistance in response to a change in temperature thereof. The thermal-sensitive film trigger is configured such that current flow therethrough varies in response to changes in the resistance of the resistive varying thermal-sensitive material.