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Calculation method of illuminance value of spatially heterogeneous light source based on three-axis rotation

A technology of three-axis rotation and calculation method, which is applied in the direction of photometry, complex mathematical operations, optical radiation measurement, etc., can solve the problem of restricting equipment and process progress, restricting fine analysis of road illumination effects, and not being able to calculate road lighting well status and other issues, to achieve the effect of low program implementation cost, reduced computing power consumption and storage space, and reliable and transparent algorithms

Active Publication Date: 2017-07-28
永麒科技集团有限公司
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Problems solved by technology

[0006] The premise of the lighting calculation in the existing scheme is to assume that the ground where the calculation environment is located is absolutely level. Road surface lighting conditions of slopes, expressway turning sections, circular viaducts and other working conditions
It also leads to the need to use new lamps and new design methods, which restricts the progress of equipment and processes
For example, in complex working conditions such as tunnels and crossroads, when it is necessary to optimize the combination of lighting directions of lamps, existing solutions show limitations.
At the same time, in the calculation of road surface illuminance in the existing technical scheme, the starting point is to meet the calculation requirements of each parameter in the basic specification requirements, and a total of 30 calculation points are set for each lane of 3 rows of road surface calculation points, which limits the calculation and analysis of the average brightness of the road surface. , longitudinal uniformity, average illuminance and other important indicators, and it also limits the fine analysis of the illuminance effect of the road surface

Method used

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  • Calculation method of illuminance value of spatially heterogeneous light source based on three-axis rotation
  • Calculation method of illuminance value of spatially heterogeneous light source based on three-axis rotation
  • Calculation method of illuminance value of spatially heterogeneous light source based on three-axis rotation

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Embodiment

[0036] The present invention takes LED street lamps as an example.

[0037] According to the common rules of LED street lamp installation, define the spatial coordinate system as figure 2 shown.

[0038] Such as image 3 As shown, the rotation of the lamp along the x-axis is defined as δ, the rotation along the y-axis is defined as ψ, and the rotation along the z-axis is defined as ν. In the (x, y, z) coordinate system, point O is the light source, and a point P on the road (x,

[0039] y, -z), when point O is rotated (δ, ψ, ν), the new coordinates of point P are (x', y', -z').

[0040]

[0041] In the above formula, according to the principle of trigonometric functions, the value of * is 0, which can be pushed to the following coordinate conversion formula:

[0042]

[0043] After calculation, the following formula can be obtained:

[0044] x'=x(cosνcosψ-sinνsinδsinψ)+y(sinνcosψ+cosνsinδsinψ)-z(cosδsinψ)

[0045] y'=-xsinνcosδ+ycosνcosδ+zsinδ

[0046] z'=x(cosνs...

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Abstract

The invention relates to a three-axis rotation space heterogenic light source illumination value calculating method. The method includes the following steps that: a light source is utilized to define a space coordinate system, and three-axis rotation is performed on the light source, so that a rotation space coordinate system can be obtained; a computational formula of the included angle C' of a sampling point and a post-rotation x axis and the included angle gamma' of the sampling point and a post-rotation z axis is derived through utilizing the trigonometric function principle and according to the angle of the three-axis rotation; C' and gamma' after the light source is rotated are obtained according to the coordinates of the pavement sampling point, and the light intensity value I< gamma' C'> of the sampling point is calculated; and an illumination value E is calculated. With the method of the invention adopted, the illumination value and brightness value of any point on a pavement can be calculated, and therefore, practical engineering can be better guided, and computation power and storage space can be greatly decreased, and efficiency can be improved. When the method is applied to an undulant pavement of which the height changes, and fitting results approximate to actual numerical values can be obtained. The implementation cost of the method is low.

Description

technical field [0001] The invention belongs to the field of luminous intensity testing of a light source of an LED lamp, and relates to a method for calculating the illuminance value of a spatially heterogeneous light source based on three-axis rotation. Background technique [0002] For each LED lamp, its luminous intensity has been fixed in the spatial distribution attribute since the design and finalization of production, which has become an important component of its product attributes. In order to describe this attribute information, the existing light source luminous intensity test method is to test the light intensity of fixed discrete position points, and these discrete position points are distributed according to the hemisphere in terms of spatial distribution, and the center of the sphere is the luminous light source , the hemispherical cross-section is parallel to the plane of the lamp substrate through the luminescent light source. The data saved in the IES fil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01J1/00G06F17/15G06F17/16
Inventor 杨方勤吴坚郑成龙张伟刘继胜张良辛凯
Owner 永麒科技集团有限公司
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