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Method for measuring mesopic vision illumination values of fluorescent powder type LED light sources with different color temperatures and mesopic vision illuminometer

An LED light source and intermediate vision technology, applied in the field of photometric detection, can solve the problems of inconvenient carrying and measurement, high price, complicated measurement, etc., and achieve the effect of ensuring safety and energy saving

Active Publication Date: 2012-09-12
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method involves a spectrometer, photopic or scotopic photometer, which is expensive, complicated to measure, and inconvenient to carry and measure.

Method used

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  • Method for measuring mesopic vision illumination values of fluorescent powder type LED light sources with different color temperatures and mesopic vision illuminometer
  • Method for measuring mesopic vision illumination values of fluorescent powder type LED light sources with different color temperatures and mesopic vision illuminometer
  • Method for measuring mesopic vision illumination values of fluorescent powder type LED light sources with different color temperatures and mesopic vision illuminometer

Examples

Experimental program
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Effect test

Embodiment 1

[0027] LED street lamp A, with a power of 120W, is a white light source composed of YAG phosphor powder excited by blue light, and the color temperature is 3300K. Install the light source on a light pole with a height of 9m, see attached figure 2 Shown in (6), it shines on the road surface (7), and the photopic average illuminance that records this illuminated surface with an illuminance meter is 15.7lx. The angle between the detection direction of the luminance meter and the road surface is 45°. The light emitted by the street lamp (6) enters the probe of the luminance meter after being diffusely reflected by the road surface (7), and the luminance of the road surface measured directly by the luminance meter (4) is 1cd / m 2 . Then the correction coefficient B of light source 1 is 1.049, and the actual intermediate vision illuminance value is 16.45lx.

Embodiment 2

[0029] LED street lamp B, with a power of 120W, is a white light source composed of YAG phosphor powder excited by blue light, and the color temperature is 6000K. Install the light source on a light pole with a height of 9m, see attached figure 2 Shown in (6), it shines on the road surface (7), and the photopic average illuminance that records this illuminated surface with an illuminance meter is 15.7lx. Measure the diffuse reflectance coefficient of the road surface with a portable reflectance meter (5) to be 0.2, as attached image 3 . The reflectance meter has a light source (8), a probe (9), a data processing unit (10), and a display unit (11). The light emitted by the self-contained light source (8) is incident vertically on the road surface, and after being diffusely reflected by the road surface (7), the light signal is measured in the direction of 45°, and the ratio of the light signal diffusely reflected by the standard whiteboard (12) is the diffuse reflectance co...

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Abstract

A method for measuring the illumination values of fluorescent powder type LED light sources with different color temperatures in the environment of mesopic vision is disclosed. An illumination measuring instrument and a portable background luminance measuring instrument (4) or a portable reflectivity measuring instrument are used, and the illumination measuring instrument comprises an illuminometer probe (1) corrected by a photopic-vision spectral luminous efficiency function, a data processing unit (2) and a display unit (3). The method is characterized by comprising the following steps of: correcting the mesopic vision illumination values of the fluorescent powder type LED light sources with different color temperatures under different background luminance conditions L from 10-3 cd / m2 to 3 cd / m2 to obtain a group of correction factors B, and storing the correction factors B into an internal memory of the illuminometer; during measurement, firstly, measuring the photopic vision illumination values Ev, and then, measuring the actual background luminance value L of the road surface by using the portable background luminance measuring instrument; alternatively, measuring the reflectivity of the road surface by using the reflectivity measuring instrument, and acquiring the background luminance value L corresponding to the illumination of the road surface so as to obtain the corresponding correction factors B; and calculating according to the conversion equation of Emes=B*Ev between the mesopic vision illumination and the photopic vision illumination to obtain the corresponding mesopic vision illumination values Emes. The illuminometer for measuring the mesopic vision illumination values, which is obtained by the method of the invention, can accurately measure the illumination values in the mesopic vision environment and reflect the real mesopic vision illumination values of road lamps observed by human eyes.

Description

technical field [0001] The invention relates to a photometric detection technology, in particular to a method for detecting intermediate visual illuminance values ​​of fluorescent powder LED light sources with different color temperatures and an intermediate visual illuminance meter thereof. Background technique [0002] The vision of the human eye can make the most direct evaluation of the lighting effect. There are two types of photoreceptor cells in the retina of the human eye: cone cells and rod cells. Cone cells consist of three cells t, d, p with different spectral responses, with low sensitivity. At a brightness of 3cd / m 2 It works under the above bright conditions and can distinguish colors and details of objects. After the light stimulus is transmitted through the optic nerve center, the spectral response to the light stimulus is called the photopic vision spectral luminous efficiency function V(λ), and its maximum response is at 555nm. Rod cells at brightness 1...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01J1/38
Inventor 金尚忠李璇赵学历李亮曹宇杰
Owner CHINA JILIANG UNIV
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