Reinforced concrete chimney is an important building of thermal power plant. The chimneys of thermal power plants are common reinforced concrete single cylinder chimneys, or based on the traditional form of reinforced concrete chimneys, lined with high-temperature acid-resistant masonry, with acid and high-temperature resistant cement masonry modified version of the chimney, with good anticorrosion and impermeability. How to improve the anti-corrosion ability of the chimney, enhance its durability and achieve safe operation is also the issue concerned by the relevant departments of the power plant all the time. Because there is no trivial matter in safety, it is very necessary to timely detect and inspect the damage condition of the chimney's resistant material and maintain its safety.

As a non-contact non-destructive testing technology, infrared thermal imaging technology has great advantages for many traditional detection methods using traditional manpower, visible light and contact temperature measuring instruments. In view of the serious environmental pollution caused by SO2, SO3, NO and other gases generated by the combustion of thermal power plants, the state makes it mandatory for thermal power plants to adopt desulfurization devices. After desulfurization, the ambient temperature in the chimney is low and the humidity is high, so the flue gas dissolves in water and forms acid solution, causing corrosion to the chimney. The traditional detection method of chimney corrosion is the method of damage or semi-damage, which is time-consuming and laborious. Therefore, the development of reinforced concrete chimney nondestructive testing technology in thermal power plant has important engineering application value.

By using infrared thermography to detect the lining of reinforced concrete chimney, the damage and corrosion of the chimney lining can be checked in real time, and the influence of the damage depth and area on the temperature of the defect area can be detected by infrared nondestructive testing under the condition of heating.