- How do thermal imaging cameras work?

Introduction

Thermal imaging cameras have become invaluable tools in various industries, including security, medical diagnostics, and industrial maintenance. These devices provide a visual representation of the infrared radiation emitted by objects, enabling users to detect temperature variations across a scene.

Principles of Thermal Imaging

Thermal imaging cameras operate based on the principles of infrared thermography. Objects emit infrared radiation as a function of their temperature, and this radiation increases with temperature. Thermal cameras capture this radiation and convert it into an electrical signal, which is then processed to create a thermal image.

Components of Thermal Imaging Cameras

The main components of a thermal imaging camera include:

• Lens: Focuses infrared radiation onto the detector.
• Detector: Arrays of infrared-sensitive elements that convert radiation into electrical signals.
• Electronics: Process signals from the detector to create images.
• Display: Visual interface that presents thermal images to the user.

Applications of Thermal Imaging

Thermal imaging technology is applied in the following areas:

• Surveillance: Security and law enforcement use thermal cameras for perimeter monitoring at night or in obscured visibility.
• Medical Diagnostics: Thermography assists in detecting physiological changes, such as inflammation or poor circulation.
• Industrial Maintenance: Detects faults in mechanical and electrical systems by identifying abnormal heat patterns.

Technical Specifications

Key parameters that define thermal imaging camera performance include:

• Spectral Range: Typically between 8-14 micrometers.
• Temperature Sensitivity (NETD): Below 50 mK for high-resolution models.
• Resolution: From 80x60 to 640x480 pixels, influencing detail level.
• Temperature Range: Usually from -20°C to 2000°C for industrial applications.

Savgood Company Solutions

Savgood is known for its innovative solutions in thermal imaging, offering products that meet diverse needs:

• SG-640 Series: High-resolution thermal cameras with NETD less than 40 mK, suitable for security applications.
• SG-384 Series: Compact and affordable solutions, offering resolutions of 384x288 for general thermal monitoring.

Conclusion

Thermal imaging cameras serve critical roles across various sectors, providing the ability to visualize thermal patterns that are invisible to the naked eye. With advancements in technology, companies like Savgood continue to develop solutions that enhance the functionality and application of thermal imaging systems.

References

• John D. Spitzer, Infrared Thermography: An Overview, Journal of Applied Physics, 2019.
• Savgood, Thermal Camera Solutions, 2023.