Infrared light (infrared) is a kind of light wave, which is invisible light between visible light and microwave in the electromagnetic spectrum. Its essence is thermal radiation, and its radiation frequency is lower than visible light and higher than microwave. All objects above absolute zero radiate energy in the infrared band, and hot objects emit more infrared radiation than cold objects.
According to the generation mechanism of infrared radiation, the application and development of infrared radiation, and considering the transmission characteristics of infrared radiation in the earth's atmosphere, people divide infrared rays in different wave bands into near infrared, short wave infrared, medium wave infrared, long wave infrared, etc. different regions. Long-wave infrared is a band of infrared radiation with a frequency range between 7.5 and 14 microns, corresponding to a frequency range of 20THz to 40THz.
2. What are the application fields of LWIR?
Long-wave infrared has a strong penetrating ability, and its penetration depth is much deeper than that of medium-wave infrared and short-wave infrared. It can observe ground objects through clouds, haze, rain and snow and other weather conditions. The following are some application fields of long-wave infrared：
①Application in the field of science and technology
Long-wave infrared has a wide range of applications in the field of science and technology, including drones, satellites, missile navigation, meteorology, fire monitoring, building thermal efficiency assessment, night vision equipment, security monitoring, etc. Among them, the most commonly used application field is security monitoring. Long-wave infrared thermal imaging cameras can be used for remote monitoring at night or in low-light environments to detect heat, so as to achieve the effect of monitoring target objects. Military, security and emergency services that support local government regulation are also important areas of LWIR technology application
In addition, the temperature distribution on the surface of an object can be measured using long-wave infrared imaging technology, thereby realizing thermal imaging detection. This technology is widely used in fault detection, energy management and environmental monitoring in the fields of machinery manufacturing, electrical and electronic, and construction engineering.
②Application in medical field
In terms of medical imaging, long-wave infrared imaging technology can be used for imaging of skin tissue and detection of lesions, such as early diagnosis and treatment monitoring of breast cancer, detection and diagnosis of skin cancer and other skin diseases, and evaluation of burnt tissue vitality. Since the long-wave infrared imaging technology does not need to touch the skin, it can perform non-invasive imaging on the human body, so it has the advantages of being painless and non-dangerous.