Multi-Layer Coating Temperature Indicator for Sealed Systems
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Solution Overview
Problem
Conventional temperature sensors are unsuitable for environments that require electrical isolation or where a wired/wireless data connection is not available, and they may fail if a maximum temperature threshold is exceeded, making it difficult to record maximum temperatures in sealed systems or complex systems where cost-effective sensor installation is impractical.
Innovation Solution
A temperature indicator device with multiple coating layers, each made of different materials that fail at distinct temperatures, providing a visual or chemical indication of the maximum temperature experienced, even after the temperature has subsided, using a substrate with coatings that can be applied directly or with intermediate layers, and comprising materials like Diamond Like Carbon (DLC) for durability and chemical stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional temperature sensors are used, then temperature readings can be obtained, but the sensors require electrical connections and data communication infrastructure that are not available in sealed or isolated systems
Solution Approach 1:
The patent extracts the temperature indication function from complex electrical sensing systems and implements it through simple coating layers that provide visual temperature records without requiring electrical connections, wires, or data communication infrastructure
Solution Approach 2:
The patent uses disposable coating layers that provide temperature indication through visual changes and are replaced rather than maintained, eliminating the need for complex electrical infrastructure and making the system suitable for sealed and isolated environments
2Reliability
If conventional temperature sensors are used, then continuous temperature monitoring is possible, but the sensors may fail if maximum temperature threshold is exceeded, losing the ability to record the peak temperature
Solution Approach 1:
The patent applies multiple coating layers with different failure temperatures in advance, arranged from highest to lowest temperature resistance, so that when temperature exceeds a threshold, the appropriate coating fails and permanently records the maximum temperature reached
Solution Approach 2:
The patent uses coating layers with different colors that remain intact or fail at different temperature thresholds, providing visual indication of maximum temperature through color patterns, thereby preserving temperature information even after the temperature event has passed
3Measurement precision
If multiple temperature sensors are installed in large and complex systems, then comprehensive temperature coverage is achieved, but the cost and complexity of installation and maintenance become prohibitive
Solution Approach 1:
The patent segments the temperature monitoring function into multiple independent coating layers, each responsible for a specific temperature threshold, allowing comprehensive temperature coverage through a single device rather than multiple sensors
Solution Approach 2:
The patent creates a multi-functional temperature indicator device that provides comprehensive temperature coverage across multiple thresholds using a single integrated system, eliminating the need for multiple separate sensors and reducing installation and maintenance costs
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 device provides a lasting and accurate visual or chemical record of the maximum temperature reached, suitable for sealed environments, avoiding chemical contamination and ensuring reliability in temperature-sensitive systems, allowing for effective fault diagnosis and maintenance.
Implementation Method 1
each coating layer comprises a different material makeup such that each coating is tailored to undergo failure at a different temperature
Implementation Method 2
The threshold temperature may be determined by a temperature at which the coating undergoes oxidation
Data Source
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AI summary
There is disclosed a temperature indicator (10) in the form of a substrate (12) with multiple coating layers (14-22). Each coating layer (14-22) is visually or chemically distinct from the substrate (12). The material makeup of each coating layer (14-22) is different such that each coating is tailored to undergo failure at a different temperature. The presence or absence of coating layers (14-22) provides a lasting visual indication of a temperature experienced by the indicator (10) in use. The temperature indicator (10) may be beneficial where the use of conventional temperature sensors is problematic, such as within reactor vessels or other sealed enclosures.