1. Volkswagen Car luminous intensity detection
The light intensity of a Volkswagen Car is the intensity of light, which is the amount of light radiated within a certain angle range. Because the LED light of Petrol Car is concentrated, the inverse square law does not apply at short distances. Therefore, the CIE127 standard stipulates that the conditions for light intensity measurement are two conditions of average normal light intensity measurement, A (far field condition) and B (near field condition). The detector area for both conditions is 1cm2. Generally, standard condition b is used to measure luminous intensity.
2. Detection of luminous flux and light efficiency
The luminous flux of a Volkswagen Car is the sum of the light emitted by the light source, that is, the amount of luminescence. Detection methods mainly include the following two types:
(1) Integral method. Light the standard lamp and the lamp under test in sequence in the integrating sphere, and record their readings in the photoelectric converter as Es and ed respectively. When the luminous flux of the standard lamp is known to be φs, the luminous flux of the lamp under test is φd=ed×φs/es. The integration method uses the "point light source" principle and is simple to operate. However, due to the deviation in color temperature between the standard lamp and the lamp under test, the measurement error is large.
(2) Spectrophotometry. The calculation of luminous flux is obtained from the distribution of spectral energy P(λ). Use a monochromator on the integrating sphere to measure the spectrum of the standard lamp between 380nm and 780nm, and then measure the measured luminous flux under the same conditions.
Luminous efficiency is the ratio of the luminous flux emitted by the light source to the power consumed. The luminous efficiency of Volkswagen Car LEDs is usually measured using the constant current method.
3. Spectral feature detection
The detection of spectral characteristics of Volkswagen Car LEDs includes spectral power distribution, color coordinates, color temperature, color rendering index, etc.
Spectral power distribution means that the light from a light source is composed of many colored radiations of different wavelengths, and the radiation power of each wavelength is also different. This difference is called the spectral power distribution of the light source. It is obtained by comparing and measuring the light source with a spectrophotometer (monochromator) and a standard lamp. Color coordinates are quantities that numerically represent the color of light emitted by a light source on a coordinate diagram. There are many coordinate systems for color coordinate maps, usually X and Y coordinate systems.
The luminous flux of a Volkswagen Car is the sum of the light emitted by the light source, that is, the amount of luminescence. Detection methods mainly include the following two types:
(1) Integral method. Light the standard lamp and the lamp under test in sequence in the integrating sphere, and record their readings in the photoelectric converter as Es and ed respectively. When the luminous flux of the standard lamp is known to be φs, the luminous flux of the lamp under test is φd=ed×φs/es. The integration method uses the "point light source" principle and is simple to operate. However, due to the deviation in color temperature between the standard lamp and the lamp under test, the measurement error is large.
(2) Spectrophotometry. The calculation of luminous flux is obtained from the distribution of spectral energy P(λ). Use a monochromator on the integrating sphere to measure the spectrum of the standard lamp between 380nm and 780nm, and then measure the measured luminous flux under the same conditions.
Luminous efficiency is the ratio of the luminous flux emitted by the light source to the power consumed. The luminous efficiency of Volkswagen Car LEDs is usually measured using the constant current method.
3. Spectral feature detection
The detection of spectral characteristics of Volkswagen Car LEDs includes spectral power distribution, color coordinates, color temperature, color rendering index, etc.
Spectral power distribution means that the light from a light source is composed of many colored radiations of different wavelengths, and the radiation power of each wavelength is also different. This difference is called the spectral power distribution of the light source. It is obtained by comparing and measuring the light source with a spectrophotometer (monochromator) and a standard lamp. Color coordinates are quantities that numerically represent the color of light emitted by a light source on a coordinate diagram. There are many coordinate systems for color coordinate maps, usually X and Y coordinate systems.