What is the brightness unit of an area based flow meter?

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What are the static and dynamic characteristics of sensors?

2. What is the brightness unit? Question 1: What is the unit of brightness? How is it regulated? Thank you. How to convert between cd/m2 (candlelight/square meter), lux (LUX), and fL (foot Lamberts)? Answer:

(1) When a light source shines on an object, we can measure which is emitted by the light source (Lumvnan brightness) or which is reflected by the object (Illuminance illuminance).

(2) Illumination depends on the reflection characteristics of the object. It is very similar to a photograph, as it only measures reflected light. Its common unit is lux. However, an EL lamp is a light source: it should be expressed in units of brightness, such as fL (foot Lambertian) or cd/m2, also known as "nits". Some engineers prefer to use fL, while international standards organizations commonly use nits. The formula for converting nits to fL is: 1 nits x 0.2919=1 fL; and 1 fL x 3.426=1 nits; These factors are derived from pi (π) and m2/ft2 (0.0929).

(4) It is obvious that using lux is an incorrect unit and cannot be converted from lux to other units. 1 Lux = 1 lumen per square meter = 0.0929 footcandle 1 footcandle= 1lumen per square foot = 10.764 Lux 1 foot Lambert= 3.426 candelas per square meter ( nit) 1 nit ( candelas per square meter) = 0.2919 foot Lambert Luminous flux: refers to the rate at which a light source emits light energy or the flow rate of light (Flow arte). It is the basic quantity used to describe the ability of a light source to emit light, measured in lumens. For example, a 100 watt (W) light bulb can produce 1750lm, while a 40W cool white fluorescent tube can produce 3150lm of luminous flux. According to the definiti

on, 1lm is the luminous flux emitted by a uniform point light source with a luminous intensity of 1cd within a solid angle of 1 spherical degree. Luminous intensity (Candlepower): Luminous intensity, abbreviated as luminosity, refers to the luminous flux emitted from a solid angle (unit: sr) of a light source, that is, the density of the luminous flux emitted by a light source or lighting fixture in a selected direction in space, unit: candle or Candela (cd). A light source with a luminous intensity of 1cd can emit a luminous flux of 12.57lm. Luminance: The density of the received light flux on the illuminated plane, which can be measured by the light flux per unit area. A light flux of 1lm is evenly distributed on a surface of 1 square meter (m2), resulting in an illumination of 1 lux (lx); A luminous flux of 1lm falls on a surface of 1 square foot (ft2), with an illuminance value of 1 foot candle (fc). Brightness: When a persons eyes see something, it can be expressed in two ways: roundness. It is used for higher luminous values such as light sources or lamps, and is directly expressed by their luminous intensity; Another one is used for objects that do not emit light but only reflect light, such as indoor surfaces or general objects, represented by brightness. Brightness refers to the luminous intensity emitted or reflected by the illuminated object in a certain direction per unit area, used to display the difference in brightness of the illuminated object. The metric unit is Candela/m2 (cd/m2) or nit, and the imperial unit is Footlambert (fl). Reflectance correction factor: The brightness of a surface depends on the amount of light falling on it and the ability of the surface to reflect light; The amount and distribu

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