Millimeter Waves
1. What is the millimeter wave?
The millimeter wave is the electromagnetic wave with a wavelength of 1 to 10 millimeters. It is in the common range of microwave wavelength and far infrared, so it shares the spectral characteristics of both. The millimeter wave plays an important role in communication, radar, control and guidance, remote sensing technology, radio astronomy, clinical medicine and spectroscopy, and more. Due to the frequency of the millimeter wave of the atmospheric window, it is possible to carry out high-capacity satellite-terrestrial communication or terrestrial communication. With the narrow wave and its low level of the side lobe of the millimeter wave antenna, you can follow the radar with a low extension angle and obtain radar images. When the long-range missile or spacecraft returns to the atmosphere, the millimeter wave, which is capable of penetrating plasma, is applied to perform communication and guidance. The high resolution millimeter wave radiometer is suitable for remote sensing of meteorological parameters. With the millimeter and sub-millimeter wave radio telescope, the space radiation spectrum can be detected and the composition of the interstellar substance inferred.
2. The Technical Principle of Millimeter Wave Imaging Active millimeter wave holographic imaging technology generates images with the ability to penetrate normal clothing. The system emits the millimeter wave in a frequency range frequency to the human body. The wave penetrates clothing and is reflected by touching the body surface or objects hidden under clothing. The system extracts useful information by receiving the reflected wave and generates the millimeter wave holographic image, by which it can be determined whether there are suspicious objects hidden on the body surface.
3. Why is the millimeter wave used for safety inspection?
The millimeter wave lies between the infrared and the microwave in the frequency spectrum. Compared to visible and infrared light, the millimeter wave can not only penetrate most non-metallic objects, but also features microwave resolution. In addition, the millimeter wave is non-ionizing radiation, whose electromagnetic radiation is only one thousandth of the telephone radiation, so it has no harm to the human body and is safer than the microwave. The millimeter wave image does not see clothing, but coins, buttons, pens, keys, among other objects, such as pistols, bombs, drugs, and other contraband materials, are clearly visible on the human body.
4. The NUCTECH Millimeter Wave Human Body Inspection System is an active millimeter wave imaging device characterized by fast scanning, complete and reliable copying, privacy protection and automatic identification of contraband materials .
