The UVA band is a part of the ultraviolet wavelength division, the wavelength is 320 ~ 420nm, also known as the long-wave black spot effect ultraviolet. It has a strong penetrating power, UVA can reach the dermis of the skin, destroy elastic fibers and collagen fibers, and tan the skin. On October 27, 2017, the list of carcinogens published by the International Agency for Research on Cancer of the World Health Organization was initially compiled for reference. Ultraviolet radiation (wavelength 100-400 nm, including UVA, UVB and UVC) was included in the list of carcinogens.
The classification of ultraviolet rays includes UVA, UVB, UVC and UVD. Among them, UVC has been absorbed and scattered by the ozone layer in the atmosphere because of its short wavelength, so it cannot reach the ground. The wavelength of UVB is among the three, and the wavelength can only reach the epidermis of the skin, while the longer UVA will penetrate deep into the skin, damage the dermis layer of the skin, and cause skin aging.
UVA wave band, wavelength 320～420nm, also known as long-wave black spot effect ultraviolet rays. It has strong penetrating power and can penetrate most transparent glass and plastics. More than 98% of the long-wave ultraviolet rays contained in sunlight can penetrate the ozone layer and clouds to reach the surface of the earth. UVA can directly reach the dermis of the skin, destroy elastic fibers and collagen fibers, and tan our skin. UVA ultraviolet rays with a wavelength of 360nm conform to the phototaxis response curve of insects, and can be used to make insect trap lamps. UVA ultraviolet rays with wavelengths of 300-420nm can pass through a special colored glass tube that completely cuts off visible light, and only emit near-ultraviolet light centered at 365nm, which can be used for ore identification, stage decoration, currency verification and other places. In October 2009, German and Italian scientists discovered that [Astaxanthin] can effectively eliminate [Ultraviolet UVA] damage to skin cells.
UVA is a terrible killer of sunlight. With its relatively long wavelength and strong penetrating ability, it can penetrate the surface of the skin and penetrate into the tissues below the dermis. It can destroy the fine structure of the skin such as collagen, elastic fiber tissue, and cause wrinkles and Fine lines make the skin sagging and aging. This is called photoaging in medicine.
In the energy distribution of ultraviolet rays in the sun, UVA is 15 times that of UVB, which is the main reason for skin tanning. It can reduce the water-bound hyaluronic acid content in the skin, dry the skin, accelerate the formation of melanin, and darken the complexion. It is also an important cause of skin cancer.
Here is a small editor to introduce to you two imported UV sensors that are used to monitor the UVA band. The first is the UV sensor-GUVA-S12SD. GUVA-S12SD adopts a chip package (SMD3528), which is especially suitable for small-sized equipment. . The output current of the sensor is proportional to the light intensity, and the output of the product has a very high consistency. The sensor has a specific spectral response. This product is mainly for the measurement of ultraviolet rays in sunlight and the intensity of UVA lamps, and is particularly suitable for UVI detection.
The last one is the ultraviolet sensor-GUVV-T21GH, GUVV-T21GH ultraviolet sensor voltage output signal, high sensitivity, good sun blindness. Widely used in: UV intensity detection and control, UV index detection. Outdoor UV index equipment, etc., can also be used for ultraviolet disinfection and UV curing, used to monitor ultraviolet intensity, UV flame detectors, etc.
