Principle of operation and application of infrared thermometer
1 Overview
Infrared temperature measurement technology plays an important role in product quality control and monitoring, equipment online fault diagnosis and safety protection, and energy conservation during the production process. In the past 20 years, non-contact infrared thermometers have developed rapidly in technology, their performance has been continuously improved, their functions have been continuously enhanced, their varieties have continued to increase, their scope of application has also continued to expand, and their market share has increased year by year. Compared with contact temperature measurement methods, infrared temperature measurement has the advantages of fast response time, non-contact, long use and service life. Non-contact infrared thermometers include three series: portable, online and scanning, and are equipped with various options and computer software. Each series has various models and specifications. Among various models of thermometers with different specifications, it is very important for users to correctly select the model of infrared thermometer.
Infrared detection technology is a key promotion project of national scientific and technological achievements during the "Ninth Five-Year Plan". Infrared detection is an online monitoring (non-power outage) high-tech detection technology. It integrates photoelectric imaging technology, computer technology, and image processing technology. It receives objects by The emitted infrared rays (infrared radiation) display its thermal image on the fluorescent screen to accurately determine the temperature distribution on the surface of the object, which has the advantages of accuracy, real-time, and speed. Any object constantly radiates infrared heat energy due to the movement of its own molecules, thus forming a certain temperature field on the surface of the object, commonly known as "thermal image". Infrared diagnostic technology absorbs this infrared radiation energy and measures the temperature and temperature field distribution on the surface of the equipment to determine the heating condition of the equipment. Currently, there are many test equipments that apply infrared diagnostic technology, such as infrared thermometers, infrared thermal TVs, infrared thermal imaging cameras, etc. Equipment such as infrared thermal TVs and infrared thermal imaging cameras use thermal imaging technology to convert this invisible "thermal image" into a visible light image, making the test effect intuitive and highly sensitive. It can detect subtle thermal state changes of the equipment and accurately reflect The heating conditions inside and outside the equipment are highly reliable and very effective in discovering hidden dangers in the equipment.
Infrared diagnostic technology can reliably predict early faults, defects and insulation performance of electrical equipment, improving the preventive test maintenance of traditional electrical equipment (preventive testing was a standard introduced in the former Soviet Union in the 1950s) to predictive state maintenance, which is also the standard for modern electric power equipment. The direction of enterprise development. Especially the current development of large units and ultra-high voltage has put forward increasingly higher requirements for the reliable operation of the power system, which is related to the stability of the power grid. With the continuous development and maturity of modern science and technology, the use of infrared status monitoring and diagnosis technology has the characteristics of long-distance, no contact, no sampling, no disintegration, and is accurate, fast, and intuitive to monitor and diagnose electrical equipment online in real time. Most faults (can cover the detection of various faults of almost all electrical equipment). It has attracted much attention from the power industry at home and abroad (an advanced state-of-the-art maintenance system that was widely used in foreign countries in the late 1970s) and has developed rapidly. The application of infrared detection technology is of great significance to improving the reliability and effectiveness of electrical equipment, improving operating economic benefits, and reducing maintenance costs. It is a good means currently widely promoted in the field of predictive maintenance, and it can also bring the level of maintenance and the health of the equipment to a higher level.
