CN111753407A - Illuminance calculation method of water area lighting system - Google Patents
Illuminance calculation method of water area lighting system Download PDFInfo
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- CN111753407A CN111753407A CN202010515797.4A CN202010515797A CN111753407A CN 111753407 A CN111753407 A CN 111753407A CN 202010515797 A CN202010515797 A CN 202010515797A CN 111753407 A CN111753407 A CN 111753407A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 136
- 238000004364 calculation method Methods 0.000 title claims abstract description 73
- 238000005286 illumination Methods 0.000 claims abstract description 122
- 230000004907 flux Effects 0.000 claims description 15
- 230000002238 attenuated effect Effects 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 3
- 239000011159 matrix material Substances 0.000 claims 1
- 230000005855 radiation Effects 0.000 description 2
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- 238000000149 argon plasma sintering Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
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Abstract
The invention provides an illumination calculation method of a water area illumination system, which can accurately calculate the illumination of the water area illumination system so as to quantify the water area illumination environment. The illuminance calculation method of the water area lighting system comprises the following steps: firstly, establishing a water area lighting system for modeling to obtain a water area lighting system model comprising a water area space outline model and an illumination model, wherein the illumination model is arranged according to the position of a lighting source in the water area lighting system; selecting more than two calculation points in the water area space contour model, and then calculating the illuminance of the light in the air at each calculation point on the horizontal plane and the vertical plane; and then calculating the illumination of the light at each calculation point in the water area according to the ratio of the illumination of the light in the water to the illumination E in the air.
Description
Technical Field
The invention relates to an illumination calculation method, in particular to an illumination calculation method of a water area illumination system, and belongs to the technical field of illumination control.
Background
Illuminance is a physical term for illumination intensity, and refers to the luminous flux of visible light received per unit area, and is used to indicate the intensity of illumination and the amount of illumination that is applied to the surface area of an object. The existing illuminance calculation is in a normal environment (in air), and an underwater illuminance calculation method and a corresponding formula are not available.
The calculation of the water area illumination (i.e. the illumination of light in water) is different from that in air, the illumination of an illuminated point calculated in air is an actual illumination value, and the calculation of the water area illumination needs to comprehensively consider various factors such as the attenuation of light in water, the spectrum of a light source, the illumination attenuation between the illuminated point and a viewpoint and the like. At present, no relevant standards and specifications are provided for reference.
Disclosure of Invention
In view of this, the present invention provides an illuminance calculation method for a water area lighting system, which can accurately calculate the illuminance of a water area, thereby quantifying the lighting environment of the water area.
The water area illumination system comprises more than two illumination light sources for illuminating the water area, the illuminance calculation of the water area illumination system refers to the calculation of the illuminance of any horizontal plane and the illuminance of a vertical plane in the water area, and the illuminance calculation method of the water area illumination system comprises the following steps:
the method comprises the following steps: firstly, modeling a water area lighting system to obtain a water area lighting system model comprising a water area space outline model and an illumination model, wherein the illumination model is arranged according to the position of a lighting source in the water area lighting system;
then respectively calculating the illuminance of light emitted by each illumination light source in the air at a horizontal plane and the illuminance of light emitted by each illumination light source in the air at a calculation point; the calculation point is any point in the water area space contour model;
step two: the ratio of the illuminance E' of the light in the water to the illuminance E in the air is equal to the light after the light is attenuated in the waterFlux to light flux in air ratio; the luminous flux of light attenuated in water is: l' ═ L · e-Cl
In the formula: l' is the luminous flux of the light after passing through the water area;
l is the luminous flux in air;
e is a natural constant;
c is the attenuation coefficient of light in water, and the attenuation coefficient of the light with the strongest wave band of the illumination light source in water is selected;
l is the length of the water area which is penetrated by the light emitted by the lighting source and reaches the calculation point;
then: illuminance E' of light in water-Cl·E (1)
According to the illuminance of the light emitted by each illumination light source in the air at the calculation point on the horizontal plane and the illuminance of the light emitted by each illumination light source in the air at the calculation point on the vertical plane, the illuminance of the light emitted by each illumination light source in the water area at the calculation point on the horizontal plane and the illuminance of the light emitted by each illumination light source in the water area at the calculation point on the vertical plane can be calculated through the formula (1);
the illuminance of the horizontal plane or the illuminance of the vertical plane at the calculation point in the water area lighting system is the superposition of the illuminance of all lighting sources in the water area lighting system at the calculation point on the horizontal plane or the illuminance of the vertical plane.
When the water area illumination system comprises a camera arranged in the water area, the shooting illumination of any point in the water area is the illumination after the secondary reflection of the illumination, and the shooting illumination comprises horizontal plane shooting illumination and vertical plane shooting illumination;
assuming that any point in the water is point A and the camera is located at point B, the horizontal plane image pickup illuminance E 'of point A under the single illumination light source'BOr the vertical plane shooting illumination is as follows:
wherein: lAThe length of the water area crossed by the light reaching point A emitted by the lighting source; lABIs the linear distance between the point A and the position of the camera; eAIs the illuminance at a horizontal plane at a point A under the illumination source in air orThe illumination of the vertical plane;
the horizontal plane shooting illumination or the vertical plane shooting illumination of the point A in the water area lighting system is the superposition of the horizontal plane shooting illumination or the vertical plane shooting illumination of the point A of all lighting sources in the water area lighting system.
Has the advantages that:
by adopting the calculation method, the illumination of any point in the water area illumination system can be conveniently and accurately calculated, so that the water area illumination environment is quantized, the design of the water area illumination system is guided, data support is provided for designing the optimal water area illumination environment, the number of illumination light sources can be reduced as much as possible on the premise of ensuring the illumination requirement, and the influence of an illumination window on the structural strength of the metal wall of the water area is reduced.
Drawings
FIG. 1 is a schematic view of a water model.
Wherein: 1-ceiling light, 2-side light, 3-camera, 4-water area profile
Detailed Description
The invention is described in detail below by way of example with reference to the accompanying drawings.
Example 1:
the embodiment provides an illuminance calculation method for a water area lighting system, which can accurately calculate the illuminance of a water area and provide data support for designing an optimal water area lighting environment.
The water area lighting system comprises more than two lighting sources for lighting the water area, wherein the light emitted by each lighting source consists of a plurality of monochromatic lights with different wavelengths, and the radiation power of each wavelength is different. The attenuation of light in water is mainly caused by the absorption and scattering of water, and the attenuation of light waves with different wavelengths in water is greatly different; and the water quality is different, the light scattering of the suspended matters in the water is different, and the light attenuation degree is different.
The light radiation energy of each lighting source is strongest in a certain wave band, and in order to simplify calculation, the attenuation coefficient of the light of the strongest wave band of the lighting source in water is selected during calculation.
The specific calculation method of the water area illumination comprises the following steps:
(1) firstly, establishing a simulation space, and then calculating the illumination data of light in the air by using a point-by-point calculation method.
Modeling calculation is carried out by utilizing the existing illumination calculation software, a water area model (comprising a water area space outline model and an illumination model) shown in figure 1 is built, the water area is simulated into a cylinder, and then a water area outline 4 in a-6 m plane is shown in figure 1; the illumination model of the water area illumination system comprises a top lamp 1 arranged at the top of a water area and side lamps 2 arranged on the inner side surface of the water area, and illumination conditions at positions of-6 m and-8 m (the positions of the water surface are 0m, 6m and-8 m are underwater 6m and 8m) are respectively calculated, and the illumination conditions are reflected by selecting illumination of different calculation points of the water surfaces of-6 m and-8 m; for convenient calculation, selecting a rectangular lattice from the calculation points, wherein the interval between adjacent calculation points in the lattice is not more than one meter; then, the illuminance of the light emitted by each illumination light source in the air at the horizontal plane and the illuminance of the vertical plane at each calculation point are calculated (the three-dimensional illuminance of the water area illumination system, namely the illuminance of the horizontal plane and the illuminance of the vertical plane are required to be calculated).
(2) Calculating attenuation of light in water
The attenuation of light in water is related as follows: l' ═ L · e-Cl
In the formula: l' is the luminous flux of the light after passing through the water area;
l is the luminous flux in air;
e is a natural constant;
c is the attenuation coefficient of light in water, namely the attenuation coefficient of the light with the strongest wave band of the selected illumination light source in water;
l is the length of the water area crossed by the light emitted by the illumination light source reaching the calculation point.
Since the illuminance is linearly proportional to the luminous flux, the ratio of the illuminance E 'of light in water to the illuminance E in air is equal to the ratio of the luminous flux L' of light attenuated in water to the luminous flux L in air:
namely:
E'＝e-cl·E (1)
according to the illuminance of the light emitted by each illumination light source in the air at the calculation point on the horizontal plane and the illuminance of the light emitted by each illumination light source in the air at the calculation point on the vertical plane, the illuminance of the light emitted by each illumination light source in the water area at the calculation point on the horizontal plane and the illuminance of the light emitted by each illumination light source in the water area at the calculation point on the vertical plane can be calculated through the formula (1);
the illuminance of the horizontal plane or the illuminance of the vertical plane at the calculation point in the water area lighting system is the superposition of the illuminance of all lighting sources in the water area lighting system at the calculation point on the horizontal plane or the illuminance of the vertical plane.
Example 2:
when there is a camera in the water area, as shown in fig. 1, a camera 3 is installed at a position of-6 m, and the shooting illumination of any point in the water area is the illumination after the secondary reflection of the illumination, so the length of the secondary reflection is required to be counted when the shooting illumination is calculated, and the shooting illumination also includes the horizontal plane shooting illumination and the vertical plane shooting illumination:
assuming that any point in the water is point A and the camera is located at point B, the horizontal plane image pickup illuminance E 'of point A under the single illumination light source'BOr the vertical plane shooting illumination is as follows:
wherein: lAThe length of the water area crossed by the light reaching point A emitted by the lighting source; lABIs the linear distance between the point A and the position of the camera; eAThe illumination intensity of the horizontal plane or the vertical plane at the point A under the illumination light source in the air;
the horizontal plane shooting illumination or the vertical plane shooting illumination of the point A in the water area lighting system is the superposition of the horizontal plane shooting illumination or the vertical plane shooting illumination of the point A of all lighting sources in the water area lighting system.
Example 3:
for the circular water area profile, for simplification of calculation: the illumination light sources at the top of the water area are calculated once as one light source group, and the illumination light sources in the circumferential direction are independently used for calculating the illumination intensity of the horizontal plane or the illumination intensity of the vertical plane, so that:
in the first step, the illuminance of the horizontal plane and the illuminance of the vertical plane at the calculation point of the light emitted by the light source group at the top of the water area in the air and the light emitted by each lighting source in the circumferential direction are calculated respectively;
in the second step, the illuminance of the light emitted by the light source group at the top of the water area, the illuminance of the light emitted by each lighting source at the calculation point in the circumferential direction at the horizontal plane and the illuminance of the vertical plane are calculated by a formula (1), wherein the length of the water area through which the light emitted by the light source group reaches the calculation point in the formula (1) is the length of the water area through which the light emitted by a main light source above the calculation point reaches the calculation point, and the main light source is the lighting source closest to the calculation point in the top lighting source;
the illuminance of the horizontal plane or the vertical plane at the calculation point in the water area illumination system is the superposition of the illuminance of the light source group at the top of the water area and the illuminance of each illumination light source at the horizontal plane at the calculation point in the circumferential direction of the water area.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. An illuminance calculation method for a water area lighting system, the water area lighting system comprising two or more lighting sources for lighting a water area; the method is characterized in that the illuminance calculation of the water area illumination system refers to the calculation of the illuminance of any horizontal plane and the illuminance of a vertical plane in a water area, and the calculation method comprises the following steps:
the method comprises the following steps: firstly, modeling a water area lighting system to obtain a water area lighting system model comprising a water area space outline model and an illumination model, wherein the illumination model is arranged according to the position of a lighting source in the water area lighting system;
then respectively calculating the illuminance of light emitted by each illumination light source in the air at a horizontal plane and the illuminance of light emitted by each illumination light source in the air at a calculation point; the calculation point is any point in the water area space contour model;
step two: the ratio of the illuminance E' of the light in the water to the illuminance E in the air is equal to the ratio of the luminous flux of the attenuated light in the water to the luminous flux in the air; the luminous flux of light attenuated in water is: l' ═ L · e-Cl
In the formula: l' is the luminous flux of the light after passing through the water area;
l is the luminous flux in air;
e is a natural constant;
c is the attenuation coefficient of light in water, and the attenuation coefficient of the light with the strongest wave band of the illumination light source in water is selected;
l is the length of the water area which is penetrated by the light emitted by the lighting source and reaches the calculation point;
then: illuminance E' of light in water-Cl·E (1)
According to the illuminance of the light emitted by each illumination light source in the air at the calculation point on the horizontal plane and the illuminance of the light emitted by each illumination light source in the air at the calculation point on the vertical plane, the illuminance of the light emitted by each illumination light source in the water area at the calculation point on the horizontal plane and the illuminance of the light emitted by each illumination light source in the water area at the calculation point on the vertical plane can be calculated through the formula (1);
the illuminance of the horizontal plane or the illuminance of the vertical plane at the calculation point in the water area lighting system is the superposition of the illuminance of all lighting sources in the water area lighting system at the calculation point on the horizontal plane or the illuminance of the vertical plane.
2. The illuminance calculation method for a water area lighting system as set forth in claim 1, wherein: when the water area illumination system comprises a camera arranged in the water area, the shooting illumination of any point in the water area is the illumination after the secondary reflection of the illumination, and the shooting illumination comprises horizontal plane shooting illumination and vertical plane shooting illumination;
assuming that any point in the water is point A and the camera is located at point B, the horizontal plane image pickup illuminance E 'of point A under the single illumination light source'BOr the vertical plane shooting illumination is as follows:
wherein: lAThe length of the water area crossed by the light reaching point A emitted by the lighting source; lABIs the linear distance between the point A and the position of the camera; eAThe illumination intensity of the horizontal plane or the vertical plane at the point A under the illumination light source in the air;
the horizontal plane shooting illumination or the vertical plane shooting illumination of the point A in the water area lighting system is the superposition of the horizontal plane shooting illumination or the vertical plane shooting illumination of the point A of all lighting sources in the water area lighting system.
3. An illuminance calculation method for a water area lighting system as claimed in claim 1 or 2 wherein: in the first step, calculation points are selected at more than two different depth positions in the water area space contour model.
4. An illuminance calculation method for a water area lighting system as claimed in claim 1 or 2 wherein: and in the first step, a dot matrix mode is selected, and then a point-by-point calculation method is adopted for calculation.
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| US20160119558A1 (en) * | 2013-06-19 | 2016-04-28 | Nec Corporation | Illumination estimation device, illumination estimation method, and storage medium |
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Application publication date: 20201009 |