CN109195271B - Method for maintaining illumination of working surface - Google Patents
Method for maintaining illumination of working surface Download PDFInfo
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- CN109195271B CN109195271B CN201811255404.XA CN201811255404A CN109195271B CN 109195271 B CN109195271 B CN 109195271B CN 201811255404 A CN201811255404 A CN 201811255404A CN 109195271 B CN109195271 B CN 109195271B
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- light
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- light intensity
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/20—Controlling the colour of the light
Abstract
The invention provides a method for maintaining the illumination of a working surface, which comprises the following steps: (A1) the light source emits illumination light; (A2) collecting ambient light and reflected light of the illumination light on the working surface to obtain total light intensity I and red light intensity IRGreen light intensity IGAnd intensity of blue light IB(ii) a (A3) The light intensity IRLight intensity IGAnd light intensity IBConverted into RGB values, R respectively0、G0、B0(ii) a (A4) Obtaining a, b and D; (A5) obtaining a correction value delta I of the total light intensity I according to the change value delta D of the D; (A6) obtaining the illumination E according to the correction value delta I; (A7) according to the illumination E and the illumination preset value E0And the light emitting of the light source is adjusted, so that the stability of the illumination of the working surface is maintained when the color of the working surface is changed. The invention has the advantages of good working surface illumination stability and the like, and can be widely applied to indoor illumination, such as classrooms.
Description
Technical Field
The present invention relates to light source regulation, and is especially method and method of maintaining the illumination of work plane.
Background
Since national standards and local standards are issued successively by relevant departments to regulate classroom illumination, part of schools adopt novel LED light sources to replace old common fluorescent lamps or three-primary-color fluorescent lamps, and the novel LED lamps can meet the specified color temperature and illumination uniformity of classroom lamps and specified illumination values of over 300 lx. Along with the continuous development and perfection of the novel lamps and the call for energy conservation, the intelligent light control system for the classroom is proposed and realized. Classroom intelligence light control system can tentatively realize classroom lamp switching and adjustment, thereby few control system pass through photosensitive element and detect the stability that improves the working face illuminance to working face ambient light change.
There are several modes in existing classroom lighting:
the common fluorescent lamp illumination and the common LED illumination are fixed, so that the uniformity of the illumination of the desktop is rarely considered, the illumination is only required under certain illumination conditions, the uniformity is poor, the adaptability to daytime, night, sunny days, cloudy days and the like is poor, the energy-saving effect is poor, and the requirements of the current national standards can not be met very much.
Specially designed intelligent LED illumination, the intelligent control system that adopts considers the installation with implement the convenience, adopts photoelectric sensor collection working face's reflected light intensity more and realizes detecting working face ambient light, and the outstanding intelligent control light of part design can satisfy the requirement of national standard. However, when the working surface is changed significantly, such as the color and relative position of the whole desktop, the light reflection capability of the working surface is changed greatly, which affects the size of the collected light. The conventional photoelectric device detects the change of ambient light by collecting the light, and if the error of the collected light caused by the color of the working surface is not eliminated, the light power change of the light source cannot be accurately adjusted, so that the uniformity of the illumination of the working surface is greatly influenced.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides a method for maintaining the illumination of the working surface, which has good stability and uniformity of the illumination of the working surface, can monitor the color change of the working surface in real time, and correct the actual illumination according to the change trend, thereby maintaining the stable illumination when the color of the working surface changes.
The purpose of the invention is realized by the following technical scheme:
a method of maintaining a work surface illumination, the method comprising:
(A1) the light source emits illumination light;
(A2) collecting ambient light and reflected light of the illumination light on the working surface to obtain total light intensity I and red light intensity IRGreen light intensity IGAnd intensity of blue light IB；
(A3) The light intensity IRLight intensity IGAnd light intensity IBConverted into RGB values, R respectively0、G0、B0；
(A4) To obtain
And;
(A5) obtaining a correction value delta I of the total light intensity I according to the change value delta D of D:
if a > 1,. DELTA.I ═ f1(ΔD)；
If a < -1,. DELTA.I ═ f2(ΔD)；
If | a | < 1, b<-1，ΔI＝f3(ΔD)；
If | a | < 1, b > 1, Δ I ═ f4(ΔD)；
If | a | < 1, | b | < 1, Δ I ═ 0;
(A6) obtaining the working surface illumination E according to the correction value delta I;
(A7) according to the illumination E of the working surface and the preset illumination value E0And the light emitting of the light source is adjusted, so that the stability of the illumination of the working surface is maintained when the color of the working surface is changed.
Compared with the prior art, the invention has the beneficial effects that:
1. the illumination change caused by the color change of the working surface is detected in real time, and the illumination change can be compensated, so that the stability of the illumination of the working surface during the color change is maintained;
2. the change of the illumination of the working surface is reflected more accurately, so that the illumination control system is driven, and the stability of the illumination of the working surface is maintained more accurately.
Drawings
The disclosure of the present invention will become more readily understood with reference to the accompanying drawings. As is readily understood by those skilled in the art: these drawings are only for illustrating the technical solutions of the present invention and are not intended to limit the scope of the present invention. In the figure:
FIG. 1 is a flow chart of a method for maintaining the illuminance of a working surface according to an embodiment of the invention.
Detailed Description
Fig. 1 and the following description depict alternative embodiments of the invention to teach those skilled in the art how to make and reproduce the invention. Some conventional aspects have been simplified or omitted for the purpose of teaching the present invention. Those skilled in the art will appreciate that variations or substitutions from these embodiments will be within the scope of the invention. Those skilled in the art will appreciate that the features described below can be combined in various ways to form multiple variations of the invention. Thus, the present invention is not limited to the following alternative embodiments, but is only limited by the claims and their equivalents.
Example 1:
fig. 1 schematically shows a method for maintaining the illuminance of a working surface according to an embodiment of the present invention, and as shown in fig. 1, the method for maintaining the illuminance of the working surface includes the following steps:
(A1) the light source emits illumination light;
(A2) collecting ambient light and reflected light of the illumination light on the working surface to obtain total light intensity I and red light intensity IRGreen light intensity IGAnd intensity of blue light IB；
(A3) The light intensity IRLight intensity IGAnd light intensity IBConverted into RGB values, R respectively0、G0、B0(in the range of 0-255);
(A4) to obtain
And;
P1＝96.422、Q1＝100、H1＝82.522；
(A5) Obtaining a correction value delta I of the total light intensity I according to the change value delta D of D:
if a > 1,. DELTA.I ═ f1(Δ D), e.g. f1(ΔD)＝-83224.23+8181.24·ΔD；
If a < -1,. DELTA.I ═ f2(Δ D), e.g. f2(ΔD)＝-58159.23+10499.94·ΔD；
If | a | < 1, b < -1, Δ I ═ f3(Δ D), e.g. f3(ΔD)＝-45357.97-135137.26·ΔD+50082.14·(ΔD)2；
If | a | < 1, b > 1, Δ I ═ f4(Δ D), e.g. f4(ΔD)＝-68028.78+7749.69·ΔD；
If | a | < 1, | b | < 1, Δ I ═ 0;
(A6) obtaining the working face illumination E ═ g (I + delta I) according to the correction value delta I, such as g (I + delta I) ═ k · (I + delta I) + m, wherein I is light intensity, and k and m are constants;
(A7) adjusting the light output of the light source according to the working surface illumination E to enable the working surface illumination value output in the step (A6) to be the preset value E0Thereby maintaining the stability of the illumination of the working surface when the color of the working surface changes.
Example 2:
an application example of the method for maintaining the illuminance of the working surface according to embodiment 1 of the present invention.
In this application example, the total light intensity I and the light intensity IR、IG、IBThe obtaining method is as follows:
(A1) the LED emits illumination light;
(A2) collecting ambient light and reflected light of the illumination light on the working surface to obtain total light intensity I and red light intensity IRGreen light intensity IGAnd intensity of blue light IBThe concrete mode is as follows:
when the light path in front of the photoelectric detector does not have a filter, the light intensity received by the photoelectric detector is the total light intensity I;
when the optical path in front of the photoelectric detector has different color filter elements, the photoelectric detector respectively receives the light beam containing only red light,Light intensity of green and blue light IR、IG、IB；
(A3) The light intensity IRLight intensity IGAnd light intensity IBConverted into RGB values, R respectively0、G0、B0(in the range of 0-255);
(A4) to obtain
And;
P1＝96.422、Q1＝100、H1＝82.522；
(A5) Obtaining a correction value delta I of the total light intensity I according to the change value delta D of D:
if a > 1,. DELTA.I ═ f1(Δ D), e.g. f1(ΔD)＝-83224.23+8181.24·ΔD；
If a < -1,. DELTA.I ═ f2(Δ D), e.g. f2(ΔD)＝-58159.23+10499.94·ΔD；
If | a | < 1, b < -1, Δ I ═ f3(Δ D), e.g. f3(ΔD)＝-45357.97-135137.26·ΔD+50082.14·(ΔD)2；
If | a | < 1, b > 1, Δ I ═ f4(Δ D), e.g. f4(ΔD)＝-68028.78+7749.69·ΔD；
If | a | < 1, | b | < 1, Δ I ═ 0;
(A6) obtaining the working face illumination E ═ g (I + delta I) according to the correction value delta I, such as g (I + delta I) ═ k · (I + delta I) + m, wherein I is light intensity, and k and m are constants;
(A7) adjusting the light output of the light source according to the working surface illumination E to enable the working surface illumination value output in the step (A6) to be the preset value E0Thereby maintaining the stability of the illumination of the working surface when the color of the working surface changes.
Claims (7)
1. A method of maintaining a work surface illumination, the method comprising:
(A1) the light source emits illumination light;
(A2) collecting ambient light and reflected light of the illumination light on the working surface to obtain total light intensity I and red light intensity IRGreen light intensity IGAnd intensity of blue light IB；
(A3) The light intensity IRLight intensity IGAnd light intensity IBConverted into RGB values, R respectively0、G0、B0；
(A4) To obtain
And;
(A5) obtaining a correction value delta I of the total light intensity I according to the change value delta D of D:
if a > 1,. DELTA.I ═ f1(ΔD)；
If a < -1,. DELTA.I ═ f2(ΔD)；
If | a | < 1, b < -1, Δ I ═ f3(ΔD)；
If | a | < 1, b > 1, Δ I ═ f4(ΔD)；
If | a | < 1, | b | < 1, Δ I ═ 0;
(A6) obtaining the working surface illumination E according to the correction value delta I;
(A7) according to the illumination E of the working surface and the preset illumination value E0And the light emitting of the light source is adjusted, so that the stability of the illumination of the working surface is maintained when the color of the working surface is changed.
2. A method of maintaining the illuminance of a work surface as recited in claim 1, wherein: constant P1＝96.422、Q1＝100、H1＝82.522。
3. A method of maintaining the illuminance of a work surface as recited in claim 1, wherein: in step (A5), f1(ΔD)＝-83224.23+8181.24·ΔD，f2(ΔD)＝-58159.23+10499.94·ΔD，f3(ΔD)＝-45357.97-135137.26·ΔD+50082.14·(ΔD)2，f4(ΔD)＝-68028.78+7749.69·ΔD。
4. A method of maintaining the illuminance of a work surface as recited in claim 1, wherein: in step (A1), the total light intensity I and the light intensity IR、IG、IBThe obtaining method is as follows:
when the light path in front of the photoelectric detector does not have a filter, the light intensity received by the photoelectric detector is the total light intensity I;
when the light path in front of the photodetector has filter devices with different colors, the photodetector receives light intensity I only containing red light, green light and blue light respectivelyR、IG、IB。
5. A method of maintaining the illuminance of a work surface as recited in claim 1, wherein: the step (a6) further includes:
and obtaining the working face illumination E-g (I + delta I) according to the corrected total light intensity value (I + delta I).
6. A method of maintaining the illuminance of a work surface as recited in claim 5, wherein: g (I)1)＝k·I1+m，I1Is the light intensity, k and m are constants.
7. A method of maintaining the illuminance of a work surface as recited in claim 1, wherein: the step (a7) further includes:
adjusting the light output of the light source to make the illumination value of the working surface output in the step (A6) be the preset value E0。
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| CN107166328A (en) * | 2017-05-13 | 2017-09-15 | 复旦大学 | The wisdom control system of Integral natural light and the complementary mixed lighting device of LED light |
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