Infrared Coating Film Monitoring Device for Corrosion Detection
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Solution Overview
Problem
Existing techniques for detecting initial corrosion symptoms like swelling and peeling of coating films on steel structures are hindered when sunlight is unavailable, as they rely on solar radiation or temperature changes, making it difficult to identify coating film deterioration or exhaustion in such conditions.
Innovation Solution
An observation device equipped with a light source that radiates infrared rays onto the coating film, an infrared camera to capture thermal images, and a display unit to show the thermal images, allowing for the detection of coating film issues even without sunlight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If passive lock-in thermography using solar radiation or temperature change is used to detect coating film peeling, then detection sensitivity is improved, but the method cannot be applied when sunlight is unavailable or temperature change is small
Solution Approach 1:
An infrared light source is introduced as an intermediary to provide the thermal excitation needed for lock-in thermography. This mediator enables the detection process to proceed independently of solar radiation, allowing the system to operate in various lighting conditions including complete darkness while maintaining high detection sensitivity through synchronized infrared imaging.
2Measurement precision
If lock-in thermography synchronizing infrared camera with heating source is used, then heat generating portions can be observed with high sensitivity, but the system becomes complex requiring synchronized control
Solution Approach 1:
The system employs feedback control where the infrared camera is synchronized with the infrared light source through a control unit that receives signals from both components. This feedback mechanism coordinates the timing of infrared radiation and image capture, enabling effective lock-in thermography to detect heat generating portions with high sensitivity while managing system complexity through integrated control.
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 effectively captures thermal images of the coating film, enabling the identification of deterioration, swelling, or peeling, even in low-light or no-light conditions, thus facilitating early detection and prevention of corrosion.
Implementation Method 1
a light source that radiates infrared rays to a surface of a target coating film
Implementation Method 2
an infrared camera that captures a thermal image of a place irradiated with the infrared rays
Data Source
AI summary
Provided are a light source that radiates (projects) infrared rays to a surface of a coating film which is an observation target, an infrared camera that captures a thermal image (infrared image) of a place irradiated with the infrared rays, and a display unit that displays the thermal image captured by the infrared camera. The thermal image captured by the infrared camera and displayed on the display unit is an image virtualized by superimposing a state (temperature distribution) of an infrared ray emitted from an object (for example, a coating film of a building) on which the infrared ray is projected in the shape of the object.