In addition to supplying energy and visible light to humans and the earth, sunlight is also rich in ultraviolet light. Recently, due to atmospheric pollution, the ozone layer has been damaged to some extent, increasing the amount of ultraviolet light that hits the earth. In addition, various artificial new light sources such as tungsten halogen lamps and metal halide lamps also generate different degrees of ultraviolet light and infrared light. Excessive exposure to ultraviolet light for a long time can cause burnt skin, burn eyes and even cause skin cancer, causing harm to humans. In addition, ultraviolet light is irradiated onto the object, which causes fading and accelerates the deterioration reaction of the object. With the development of science and technology, people are increasingly aware that in addition to visible light, ultraviolet light and infrared light are also important factors in the light environment of the earth. Since ultraviolet light and infrared light have important influences and effects on living things, substances, and objects on earth, especially when ultraviolet radiation and infrared radiation are widely used in research, and attention is paid to reducing hazards, the measurement of infrared and ultraviolet is strengthened. It seems more important. The ultraviolet light allowable range (TLV) proposed by ACG1H (American Labor Hygiene Specialist Conference) for operations harmful to human eyes and skin light has been responded to by countries around the world and monitored and controlled by reference to the implementation of this standard.
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