More applications and principles of infrared thermometers
Infrared thermometer is composed of optical system, photoelectric detector, signal amplifier, signal processing, display output and other parts. The optical system gathers the target infrared radiation energy in its field of view, and the size of the field of view is determined by the optical parts of the thermometer and its position. Infrared energy is focused on a photodetector and converted into a corresponding electrical signal. The signal passes through the amplifier and signal processing circuit, and is converted into the temperature value of the measured target after being corrected according to the algorithm of the internal treatment of the instrument and the emissivity of the target.
Infrared diagnostic technology can make reliable predictions for early failure defects and insulation performance of electrical equipment, and improve the preventive test maintenance of traditional electrical equipment (preventive test is the standard introduced in the former Soviet Union in the 1950s) to predictive state maintenance, which is also the modern electric power system. The direction of enterprise development. Especially now that the development of large units and ultra-high voltage has put forward higher and 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 state monitoring and diagnostic technology has the characteristics of long-distance, no contact, no sampling, no disassembly, and has the characteristics of accuracy, speed, and intuition, and can monitor and diagnose electrical equipment online in real time. Most of the faults (can cover almost all kinds of fault detection of electrical equipment).
It has received much attention from the power industry at home and abroad (an advanced condition-based maintenance system commonly used in foreign countries in the late 1970s), and has developed rapidly. The application of infrared detection technology is of great significance to improve the reliability and effectiveness of electrical equipment, improve the economic benefits of operation, and reduce maintenance costs. It is a very good method that is widely promoted in the field of predictive maintenance at present, and it can make the maintenance level and the health level of equipment to a higher level.
In the production process, infrared temperature measurement technology plays an important role in product quality control and monitoring, equipment online fault diagnosis and safety protection, and energy saving. 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, safe use and long service life. Non-contact infrared thermometers include three series of portable, on-line and scanning, with various options and computer software, and each series has various models and specifications. Among the various models of thermometers with different specifications, it is very important for users to choose the correct model of infrared thermometer.
When using an infrared thermometer to measure the temperature of a target, it is first necessary to measure the infrared radiation of the target within its band range, and then the temperature of the measured target is calculated by the thermometer. Monochromatic pyrometers are proportional to the amount of radiation within a band; dual-color pyrometers are proportional to the ratio of the amount of radiation in the two bands.
