Based on the working principle of infrared focal plane detectors, thermal imaging systems are divided into two categories: photon detectors and thermal detectors.Boasting high sensitivity, low noise and ultra-fast response speed, photon detectors generally require a cryogenic cooling unit during operation. This leads to larger overall system size, higher power consumption and elevated equipment costs.     

 The detectivity of thermal detectors is barely affected by operating temperature variation, hence the name uncooled infrared detectors. Although their detection precision is slightly inferior to cooled detectors, they eliminate the need for cooling hardware. Such systems feature high integration and low power consumption, and portable infrared thermal cameras fall into this product category.

Composition of an Infrared Thermal Imaging System

Fundamental Working Principle：All objects with a temperature above absolute zero spontaneously emit radiant energy in the form of infrared rays. The infrared radiation penetrates atmospheric transmission windows and reaches the camera lens. The optical system filters and converges infrared radiation to form an optical image, which is then converted into electrical signals by the infrared focal plane detector.

Subsequent signal conditioning circuits and compensation & correction algorithms process the electric signals, and a display terminal outputs thermal images mapped to the target’s temperature distribution, visualizing otherwise invisible infrared radiation. The structural schematic of the thermal imaging system is shown in the attached diagram.

An infrared thermal imager consists of five core modules: infrared lens, infrared detector assembly, electronic processing unit, display module and supporting software.

Infrared Lens: Receives and converges infrared radiation emitted by measured objects.

Infrared Detector Assembly: Converts infrared radiation signals collected by the lens into electrical signals.

Electronic Processing Unit: Processes and optimizes the converted electrical signals.

Display Module: Renders processed electrical signals into visible thermal images.

Software System: Analyzes acquired data and calculates temperature values displayed on thermal images.

In simple terms, a thermal imager captures invisible infrared energy radiated by objects, converts it into viewable thermal imagery, and presents the results on a display screen.

Application Scenarios of Infrared Thermal Imaging Technology：Core application fields include industrial inspection & predictive maintenance, building energy efficiency assessment & fault diagnosis, public security & perimeter surveillance, medical treatment & life science, scientific research & experimental development, automotive industry, agriculture & forestry, as well as transportation monitoring.

With continuous technological upgrades including higher resolution, lower hardware costs and intelligent algorithm software iteration, the application boundary of infrared thermal imaging keeps expanding and penetrating deeper into more industry segments.