Thermography

Definition

Thermography is a non-contact inspection technique that uses thermal imaging cameras to detect and measure infrared radiation emitted from object surfaces. It captures thermal emissions that vary with the object's temperature and emissivity, along with reflected radiation from surrounding sources, converting them into thermal images called thermograms. In manufacturing environments, long-wave infrared (LWIR, 8-14μm) cameras are primarily utilized.

Applications in Manufacturing

Predictive Maintenance

• Electrical Equipment Inspection: Early detection of overheating in electrical panels, motors, and transformers to prevent fires and failures
• Rotating Machinery Monitoring: Detecting abnormal heat patterns in bearings and gearboxes to minimize equipment downtime

Quality Inspection

• Weld Inspection: Real-time verification of weld quality and identification of defect areas
• Composite Material Testing: Non-destructive testing for delamination and voids in aerospace applications
• Injection Molding Dies: Analyzing mold temperature distribution to improve cooling imbalances

AI-Powered Enhancement

• Deep Learning Defect Classification: Applying CNN models to thermal images for automatic normal/abnormal pattern classification
• Predictive Maintenance: Time-series analysis of temperature trends to predict equipment failure timing
• Real-time Monitoring: IoT-connected thermal cameras for 24/7 automated surveillance systems

Key Points

The greatest advantage of thermography is its ability to quickly inspect large areas in a non-contact, non-destructive manner. It enables inspection of operating equipment without production interruption, minimizing productivity loss. When combined with AI vision systems, it automates experience-dependent human judgment and quantitatively analyzes subtle temperature variations, simultaneously improving manufacturing quality and equipment reliability.