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irradiance是什么意思，irradiance翻译
Irradiance is a term used to describe the amount of energy per unit area that is incident on a surface from a light source. It is a measure of the intensity of the light, and is often used in fields such as photography, solar energy, and lighting design. The unit of irradiance is the watt per square meter (W/m^2), and it can be thought of as the power of the light source divided by the area of the surface that the light is hitting.
There are several factors that can affect the irradiance of a light source. One of the most important factors is the distance between the light source and the surface. As the distance increases, the irradiance decreases, because the same amount of light is spread out over a larger area. This is why objects that are farther away from a light source appear to be dimmer. Another factor that can affect irradiance is the angle at which the light strikes the surface. When light strikes a surface at a perpendicular angle (i.e., straight down), the irradiance is higher than when the light strikes the surface at a shallow angle.
In the field of solar energy, irradiance is a critical concept. The amount of irradiance that reaches a particular location on the Earth's surface depends on several factors, including the latitude of the location, the time of day, and the weather conditions. Solar panels are designed to maximize the amount of irradiance that they can capture, and the efficiency of a solar panel can be affected by the angle at which the light strikes the panel and the quality of the materials used in the panel.
Irradiance is also an important concept in the field of photography. Photographers often use irradiance measurements to determine the appropriate exposure settings for a particular scene, and to calculate the amount of light that is needed to properly illuminate a subject. In addition, irradiance measurements can be used to calculate the brightness of a scene in units of lux (lumens per square meter), which is a common unit of measurement for lighting conditions in indoor environments.
In conclusion, irradiance is a fundamental concept in the fields of photography, solar energy, and lighting design. It is a measure of the intensity of light, and can be affected by factors such as the distance between the light source and the surface, the angle at which the light strikes the surface, and the weather conditions. Understanding irradiance is important for photographers and solar energy professionals, as it helps them to determine the appropriate exposure settings and to design systems that can capture the maximum amount of light energy.