Infrared nondestructive testing is a kind of non-contact on-line monitoring technology, it combines the photoelectric imaging, computer and image processing technology into one, by receiving the IR object, the temperature distribution in the image displayed on the screen, allowing the detection to accurately judge the temperature distribution on the surface of the object. It can detect the subtle thermal state changes of the equipment, accurately reflect the internal and external heating conditions of the equipment, and is very effective for the detection of early defects and hidden dangers of the equipment.

1. Composition and principle of infrared thermal camera

The equipment used in infrared nondestructive detection is called infrared thermal imager, which uses infrared detector, optical imaging objective lens and optical machine scanning system to receive the infrared radiation energy distribution pattern of the measured target and reflect it on the photosensitive element of infrared detector. Between the optical system and infrared detectors, there is a light engine scanning mechanism of infrared thermal image of the scanned object to be tested, and focus on the unit or spectroscopic detector, the infrared radiant energy can be converted into electrical signals by the detector, the amplification processing, conversion, or standard video signal through the television screen or monitor shows that the infrared thermal image map.

2. Characteristics of infrared nondestructive testing technology

Compared with other detection technologies, infrared nondestructive detection technology has the following characteristics:

1) It can realize non-contact measurement, and the detection distance can be near or far

2) High precision

3) High spatial resolution

4) Quick reaction

5) The detection is easy to operate, safe and reliable, and easy to realize automation and real-time observation

6) When periodic heating source is used for heating, defects at different depths can be detected with different heating frequencies. When the frequency is high, it is helpful to detect the surface microcrack. At low frequency, deeper defects can be detected, but the sensitivity is reduced

7) The size, shape and depth of defects can be displayed by using thermal imager

3. Application of infrared nondestructive testing technology

At present, China's infrared nondestructive testing technology has been widely used, mainly in the power industry, iron and steel industry, electronic industry, petrochemical industry, construction, aerospace and medical fields.

1) Power: mainly used for testing generator units, transmission line joints, insulation parts, etc.;

2) In the iron and steel industry: infrared detection technology can be used in all production links from smelting to steel rolling, such as hot blast furnace damage diagnosis, ingot temperature measurement, the determination of defective blast furnace mouth location, etc.;

3) In the field of electronics industry: realized the electric detection of printed board circuit;

4) In petrochemical industry: online testing of equipment under high temperature and high pressure to provide support for the maintenance and maintenance of equipment;

5) In terms of architecture: mainly used for building energy conservation monitoring and the detection of the sticking quality of building surface layer; also studied in the detection of building leakage, fire damage and freezing-thawing of building structure concrete;

6) In aerospace: debonding defect detection of sandwich structures, honeycomb water accumulation detection of aircraft in service, defect detection and thickness measurement of wave absorption layer, defect detection of thermal barrier coating, etc.

Yoseen Infrared has professional detection equipment and personnel, can provide professional infrared thermal imaging detection services for various industries, infrared temperature imaging of the detected objects, find the defects and characteristics, and finally get a professional report.