As one of the symbols of social progress, electrification is entering more and more areas of the national economy and people’s lives, bringing with it a variety of convenient and intelligent living environments. In the development of cities and industrial production and operation environments, electrified equipment plays an indispensable and important role. However, with the increase in the use of electrical equipment, various electrical fire hazards have also emerged. Because these hidden dangers have certain "hidden" and "latent" nature, they are not easily discovered. Once they occur, they will result in huge damage to property and injuries.
There are many factors inducing corporate security accidents, of which electrical security incidents are a common security risk in today's enterprises. The inspection of electrical systems is an indispensable part of every enterprise's security risk assessment. Usually we use infrared thermal imaging technology to detect and effectively perform preventive maintenance and evaluation of electrical equipment.
First, what is infrared thermal imaging technology?
Infrared radiation is one of the most widespread electromagnetic radiations in nature. Its position in the continuous spectrum of electromagnetic waves is in the area between radio waves and visible light, and therefore cannot be seen by human eyes.
German astronomer Sir William Herschel , who used sunlight to do some experiments in 1800 . Herschel allowed sunlight to pass through a prism and placed thermometers in various colors. The temperature of each color was measured with a sensitive mercury thermometer, and infrared radiation was found. Herschel found that the temperature rose when he crossed the red light into what he called the “dark red hot†zone.
Infrared thermal imaging technology passively receives infrared radiation emitted by objects. Its principle is based on that all objects in the natural world whose temperature exceeds absolute zero (-273 °C ) will emit electromagnetic radiation of different wavelengths. The higher the temperature of an object, the more The more intense the thermal motion of an atom, the stronger the infrared radiation therein. The spectral distribution or wavelength of radiation is related to the nature and temperature of the object. The amount that measures the ability of an object to radiate is called the emissivity factor. Objects with dark colors or dark surfaces have large emissivity and strong radiation. Objects with light colors or light surface colors have small emissivity and weak radiation.
The human eye can see only a very narrow section of the electromagnetic radiation wavelength, and the wavelength of radiation in the 0.4 μ m or 0.7 μ m or more, the human eye is powerless. The wavelength of infrared radiation is between 0.7 μm and 1 mm , so infrared radiation is invisible to the human eye.
Modern thermal imaging device operates in the infrared region (wavelengths 3 ~ 5 μ m) or far infrared region (wavelength of 8 ~ 12 μ m). By detecting the infrared radiation emitted by the object, the thermal imager produces a real-time image that provides a thermal image of the scene. It turns the invisible radiation image into a visible and clear image. The thermal imager is very sensitive and can detect temperature differences of less than 0.1 °C .
Second, the main features of infrared thermal imaging technology:
Non-contact temperature measurement
Infrared thermal image sensors can be remotely measured and imaged without contact with the surface of the object.
Thermal distribution image
By toning the temperature of the surface of the object, infrared thermal imaging technology can visually observe the surface of the object
Thermal distribution image.
Regional temperature measurement
The infrared thermal image measures the temperature value of the entire surface of the object surface and can simultaneously measure the temperature value of tens of thousands or even hundreds of thousands of points.
Third, what is an infrared thermal imager?
The infrared thermal imager uses an infrared detector and an optical imaging objective lens to receive the infrared radiation energy distribution pattern of the target to be reflected on the photosensitive element of the infrared detector so as to obtain an infrared thermal image, which is a heat distribution of the thermal image and the surface of the object. Field corresponds. In layman's terms, an infrared camera converts the invisible infrared energy emitted by an object into a visible thermal image. The different colors above the thermal image represent the different temperatures of the measured object. By viewing the thermal image, the overall temperature distribution of the measured target can be observed, and the target's fever situation can be studied, so that the next step of work can be judged.
Humans have been able to detect infrared radiation. The nerve endings in human skin can respond to temperature differences as low as ± 0.009 ° C (0.005 ° F) . Although human nerve endings are extremely sensitive, their construction is not suitable for lossless thermal analysis. For example, although humans can find warm blooded prey in the dark with the animal's thermal sensation, they may still need to use better heat detection tools. Due to human physical structure limitations in detecting thermal energy, mechanical and electronic devices that are very sensitive to thermal energy have been developed. These devices are standard tools for checking thermal energy in many applications, and infrared thermal imaging cameras are among them.
Fourth, infrared thermal imaging technology development
Although infrared heat radiation was discovered in 1800 , thermal imaging technology was not used in non-military applications until the 1960s, and civilian first-generation thermal imaging cameras began to appear as sophisticated instruments. Gradually applied by various industries. In 1988 , AGEMA developed the portable battery-powered ThermoVision 400 series. Since then, thermal imaging cameras have entered a period of rapid development, and they have quickly been widely used in electric power, equipment maintenance, inspections, circuit research and development, and materials research and development.
At the beginning of the 21st century, with the development of thermal imaging technology, the second generation of thermal imagers began to develop toward the sensor. Because it is suitable for long-term online monitoring and network monitoring, 24- hour real-time monitoring of key equipment and high-risk areas can be performed, and other equipment can be linked to form a monitoring system to achieve large-scale networking. Subsequently gradually used in substation monitoring, fire prevention, security and assisted driving.
After 2010 , thermal imaging technology began to integrate with the mobile Internet. With the convenience of mobile phone handling, rapid growth of processing capabilities and mobile networking capabilities, thermal imaging cameras began to integrate with mobile phones. The third generation thermal imager, represented by FOTRIC , makes operation simpler and more powerful. Moreover, the mobile camera thermal imager facilitates fast cloud storage and data sharing, making the thermal imager a stand-alone thermal imaging acquisition terminal from isolated instruments and sensors, which significantly expands the thermal image application space.
V. Conclusion
With the popularity of thermal imaging technology, the Thermal ImagerTM, released in 2017 at the CES in the United States , became the representative of the fourth generation of thermal imaging cameras. Thermal imaging technology began the development of intelligent and Internet-based deep integration. Cloud Thermal ImagerTM is an intelligent thermal image surveillance camera based on Internet services. Without complicated network settings or thermal imaging expertise, Smart Cloud Thermal Imager TM automatically identifies fire risk and security intrusion risk. This will make the thermal imaging technology more popular. Through the in-depth application of thermal imaging technology, it will gradually increase social security and work efficiency, opening up a new era of thermal imaging.
The information in this article comes from the Internet and was reorganized and edited by China Rescue Equipment Network.
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