Principles of Infrared Thermal Imaging Cameras Infrared is an electromagnetic wave of the same nature as radio waves and visible light. The discovery of infrared is a leap in human understanding of nature.
Using a special electronic device to convert the temperature distribution on the surface of an object into an image visible to the human eye and display the temperature distribution on the surface of the object in different colors is called infrared thermal imaging. This electronic device is called an infrared camera.
The infrared thermal imaging camera uses an infrared detector, optical imaging lens and optical-mechanical scanning system (the current advanced focal plane technology dispenses with the optical-mechanical scanning system) to receive the infrared radiation of the measured target . The radiant energy distribution pattern is printed on the photosensitiveelement of the infrared detector reflected between the optical system and the infrared detector;
There is an opto-mechanical scanning mechanism (the focal plane thermal imager does not have this mechanism) scans the infrared thermal image of the to object to be inspected and focuses it on the unit or spectroscopic detector. The detector converts the infrared radiation energy into an electrical signal that is amplified. Converts or displays a standard video signal on a television screen or monitor. Infrared thermal image.
This type of thermal image corresponds to the heat distribution field on the surface of the object; essentially it is the thermal image distribution of the infrared radiation of each part of the measured target. Because the signal is very weak, it differs from the visible light image. In comparison, it lacks layering and three-dimensionality;
So to judge theInfrared heat distribution In order to make the field of the measured target more effective during actual operation, some auxiliary measures are often used to increase practical functions, such as: B. Image brightness, contrast control, true standard correction, false color drawing contour and histogram for math operations, printing, etc.
Thermal imaging cameras are widely used in both military and civilian fields.
As thermal imaging technology matures and the emergence of various low-cost civilian thermal imaging cameras, it is playing an increasingly important role in various sectors of the economy.
In industrial production, many devices are often used under high temperature, high pressure and high speed operating conditions. The use of infrared thermal imaging cameras to detect and monitor these devices can not only ensure the safee operation of the system, but also unusual situations can be recognized in order to eliminate hidden dangers in good time.
At the same time, thermal imaging cameras can also be used for quality control and management of industrial products.
In addition, thermal imaging cameras have important applications in many fields such as medical treatment, public safety, fire protection, archaeology, transportation, agriculture and geology. For example, finding heat leaks in buildings, detecting forest fires, finding sources of fire, sea rescue, identifying ore quarries, inspecting engines, reconnaissance and non-destructive inspection of various materials and products, etc.