The meaning of ultraviolet rays, wavelength band (UVA, UVB, UVC) and hazards

Ultraviolet rays are rays of sunlight with a wavelength of 100 to 400 nanometers (nm). English is ultraviolet, ultra- means above, beyond. The frequency of ultraviolet rays in the solar spectrum is higher than that of visible rays. Can be divided into UVA (ultraviolet A, wavelength 320-400 nm, long wave), UVB (wavelength 280-320 nm, medium wave), UVC (wavelength 100-280 nm, short wave). Among them, UVA is the most carcinogenic, and the sunburn and sunburn effects are 1000 times that of UVB. UVC is generally blocked by the ozone layer. IR (Infrared) is infrared, which can cause sunburn, microvessel dilation, dermatitis, and promote the carcinogenicity of ultraviolet rays. Ultraviolet radiation will produce a lot of free radicals in the skin, leading to peroxidation of cell membranes, causing melanocytes to produce more melanin, which is distributed upward to the cuticle of the epidermis, causing black spots.

Ultraviolet rays can be divided into near ultraviolet rays UVA, far ultraviolet rays UVB and ultra-short ultraviolet rays UVC according to the wave.

Longwave UVA is referred to as UVA. It is ultraviolet light with a wavelength of 315 ~ 400nm. Long-wave UV penetrates clothing and human skin far more than medium-wave UV, and can reach the depth of the dermis, and can act on the melanin in the epidermis, causing skin melanin deposition, making the skin black, and protecting against UV rays Protects the skin. Therefore, long-wave UV is also called “tanning section”. Although long-wave UV does not cause acute skin inflammation, it has a slow effect on the skin and can accumulate for a long time, which is one of the causes of skin aging and serious damage.

Medium-wave ultraviolet rays are referred to as UVB for short, and are ultraviolet rays with a wavelength of 280 to 320 nm. UVB has a certain physiological effect on human skin. A large part of these ultraviolet rays are absorbed by the skin epidermis and cannot penetrate into the skin. However, due to its high level energy, it can produce strong light damage to the skin, the dermal blood vessels in the irradiated part expand, and the skin can appear redness, blisters and other symptoms. Long-term exposure to the skin can cause erythema, inflammation, and skin aging. In severe cases, it can cause skin cancer. Therefore, the mid-wave ultraviolet rays, also known as the sunburn (red) band of ultraviolet rays, are the ultraviolet bands that should be focused on prevention.

Short-wave ultraviolet rays are referred to as UVC for short, and are ultraviolet rays with a wavelength of 200 to 280 nm (nano). Short-wave ultraviolet rays are absorbed by the ozone layer when they pass through the stratosphere on the earth’s surface, and cannot reach the earth’s surface. Short-wave ultraviolet rays can have an important effect on the human body, therefore, enough attention should be paid to short-wave ultraviolet rays.

It can be seen that the prevention of skin damage caused by ultraviolet radiation is mainly to prevent the exposure of ultraviolet UVB. Ultraviolet rays can be used for sterilization, but too much ultraviolet rays can enter the human body and cause skin cancer. LISUN LPCE-2(LMS-9000BUV) integrating sphere UV VIS is used to test the UV lamp (light source) Spectrum, Radiant, Efficiency, CRI, CCT, UVA, UVB, UVC radiant and electric parameters.Spectral Range Wavelength: 200-400nm(UV). The whole system includes the LMS-9000BUV High Precision UV Spectroradiometer,CFS-1.2M Silica Fiber,CASE-UV036 Dark Case for UV Test (can ensure that the distance from the UV probe to the UV light source is 1 meter),SLS-UV UV Standard Light Source with Calibrate Current (Optional).

Here is photo below shows the test system:

The following is the test report of this product for your reference:

Lisun Instruments Limited was found by LISUN GROUP in 2003. LISUN quality system has been strictly certified by ISO9001:2015. As a CIE Membership, LISUN products are designed based on CIE, IEC and other international or national standards. All products passed CE certificate and authenticated by the third party lab.

Our main products are Goniophotometer, Surge Generator, EMC Test Systems, ESD Simulator, EMI Test Receiver, Electrical Safety Tester, Integrating Sphere, Temperature Chamber, Salt Spray Test, Environmental Test Chamber, LED Test Instruments, CFL Test Instruments, Spectroradiometer, Waterproof Test Equipment, Plug and Switch Testing, AC and DC Power Supply.

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