WO2016169043A1

WO2016169043A1 - Light collection system

Info

Publication number: WO2016169043A1
Application number: PCT/CN2015/077351
Authority: WO
Inventors: 张昭宇; 曹亮亮; 刘国梁
Original assignee: 北京大学深圳研究生院
Priority date: 2015-04-24
Filing date: 2015-04-24
Publication date: 2016-10-27

Abstract

A light collection system. The light collection system comprises a first light collector (11), a second light collector (12) and an optical fiber (13), sequentially arranged on a light path. The second light collector (12) comprises an incident light port (121) and an emergent light port (122), the emergent light port (122) being coupled to the optical fiber (13). The first light collector (11) is configured to gather sunlight to the incident light port (121) of the second light collector (12), and the second light collector (12) is configured to collect the incident sunlight into the optical fiber (13) for transmission. Edges of the incident light port (121) comprise a long edge and a short edge. A gathered light spot formed on the incident light port (121) of the second light collector (12) by the sunlight moves on the incident light port (121), and a component of the movement speed of the gathered light spot at every moment on the long edge is greater than a component on the short edge. The light collection system can prolong time when sunlight can be output when the light collection system is under a stationary condition, and the luminous flux collected by the light collection system is increased.

Description

Specification Name of Invention: A Light Collection System Technical Field

[0001] The present invention relates to the field of lighting technologies, and in particular, to a light collecting system.

BACKGROUND OF THE INVENTION

[0003] In existing solar illumination systems, sunlight is focused through a lens onto one end face of the fiber, coupled into the fiber for transmission, and output from the other end of the fiber where illumination is desired. An illumination head can be further placed at the end of the fiber output to shape the output light according to different lighting requirements. The diameter of the fiber is very small, generally only lmm~3mm. This solar lighting system requires a tracking device that keeps the optical axis of the lens parallel to the sunlight.

[0004] If there is no tracking device, since the sun will always run, when the sunlight has a certain angle with the optical axis of the lens, the focused spot of the sunlight will deviate from the focus position, thereby moving out of the fiber end face, or when the angle is large to some extent, The focused spot will be completely outside the fiber end face, causing the system to have no light output.

SUMMARY OF THE INVENTION

[0006] Embodiments of the present invention provide a light collecting system capable of extending the time of the sunlight that can be outputted while the light collecting system is stationary, and increasing the luminous flux collected by the light collecting system. The light collecting system of the present invention includes :

[0007] a first concentrator, a second concentrator, and an optical fiber arranged in sequence on the optical path;

[0008] The second concentrator includes an entrance port and a light exit port, the light exit port is coupled to the optical fiber, the first concentrator is configured to concentrate the sunlight to the light entrance of the second concentrator, and the second concentrator is used for The incident sunlight is collected and transmitted into the optical fiber;

[0009] The light entrance port has a narrow strip shape, and the edge of the light entrance port includes a long side and a short side, and a concentrated spot formed by the sunlight on the light entrance port of the second concentrator moves on the light entrance port, and the spot light is concentrated. The velocity of the engraving movement on the long side is greater than the component on the short side.

[0010] In an embodiment, the light entrance of the second concentrator is rectangular or elliptical;

[0011] Alternatively, the long side of the light entrance port is translated to a moving track 汇 of the concentrated spot on the light entrance port, and the long side of the light entrance port coincides with the moving track. [0012] In an embodiment, the light exit of the second concentrator is coupled to one fiber, and the light exit of the second concentrator is smaller than the incident end face of the fiber.

[0013] In one embodiment, the incident end face of the optical fiber is circular, and the light exit port of the second concentrator is a square that is inscribed with the incident end face of the optical fiber.

[0014] In an embodiment, the light exit of the second concentrator is coupled to the at least two fibers, and the incident end faces of the at least two fibers are closely spliced with each other, and the area of the light exit of the second concentrator is less than at least two fibers. The area enclosed by the edge of the incident end face.

[0015] In one embodiment, the second concentrator is composed of a composite parabolic concentrator reflective surface;

[0016] Alternatively, the second concentrator is composed of a transparent medium having a refractive index greater than 1, and the sunlight is totally reflected in the second concentrator;

[0017] Alternatively, the outer surface of the side wall of the second concentrator is covered with a reflective film.

In one embodiment, the second concentrator and the incident end face of the optical fiber are filled with a transparent medium having a refractive index greater than 1.

[0019] In one embodiment, the first concentrator is a collecting lens, and a field lens is further disposed between the collecting lens and the second concentrator, wherein a focal length of the field lens is equal to a focal length of the collecting lens;

[0020] The light beam emitted from the first concentrator is incident on the second concentrator through the field lens.

[0021] In an embodiment, the second concentrator is a solid body, and the second concentrator and the field lens are integrally formed.

[0022] In an embodiment, the light collecting system further includes an automatic tracking device, configured to detect a position of the concentrated spot on the light entrance of the second concentrator, and partially or completely remove the concentrated spot. The optical port is automatically adjusted to rotate the first concentrator, the second concentrator, and the optical fiber in the direction in which the sunlight changes, so that the optical axis of the first concentrator is parallel to the sunlight.

[0023] According to the light collecting system of the above embodiment, since the second concentrator is disposed between the first concentrator and the optical fiber in the light collecting system, the sunlight collected by the first concentrator can be collected The converging spot is coupled into the optical fiber so as to ensure that the sunlight can enter the optical fiber without changing the area of the incident port of the optical fiber; in addition, since the moving trajectory of the spot concentrated by the first concentrator is curved The light entrance of the second concentrator is narrow and long, and the edge of the light entrance includes a long side and a short side, and the concentrated spot formed by the sunlight on the light entrance of the second concentrator moves on the light entrance. And the concentration of each engraved spot on the long side is greater than the component on the short side, so that the movement of the converged spot can be ensured. The moving track completely falls on the same port in the light entrance of the second concentrator, reducing the area of the light entrance of the second concentrator, and prolonging the sunlight output of the light collecting system when the light collecting system is stationary. And increase the amount of light that the light collection system can transmit.

BRIEF DESCRIPTION OF THE DRAWINGS

1 is a schematic structural view of an embodiment of a light collecting system of the present invention;

2 is a schematic diagram of a movement trajectory of a converged spot;

[0027] FIG. 3 is a schematic view of the light exit port of the second concentrator and the incident end face of the optical fiber;

4, FIG. 5 and FIG. 6 are respectively schematic diagrams showing the shape of the light entrance of the second concentrator in the light collecting system shown in FIG. 1. [0029]

[0030] Embodiments of the present invention provide a light collecting system capable of extending the time during which the light collecting system can output sunlight while the light collecting system is stationary, and increasing the luminous flux collected by the light collecting system.

The technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. The embodiments are merely a part of the embodiments of the invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without departing from the inventive scope should fall within the scope of the present invention.

[0032] The terms "including" and "comprising", and any variations thereof, are intended to cover a non-exclusive inclusion, such as a process comprising a series of steps or units. The methods, systems, products, or devices are not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not explicitly listed or inherent to such processes, methods, systems, products, or devices.

Please refer to FIG. 1. FIG. 1 is a schematic structural view of an embodiment of a light collecting system of the present invention. In this embodiment, the light collecting system includes a first concentrator 11, a second concentrator 12, and an optical fiber 13 which are sequentially arranged on the optical path.

[0034] The second concentrator 12 includes an optical entrance 121 and an optical outlet 122, and the optical outlet 122 is coupled to the optical fiber 13. The first concentrator 11 is for concentrating sunlight to the light entrance 121 of the second concentrator 12. Specifically, the first concentrator 11 may be a focus lens. Of course, the above is merely an example and is not limiting. [0035] The second concentrator 12 is for collecting incident sunlight into the optical fiber 13 for transmission. In practical use, the first concentrator 11 focuses the sunlight onto the light entrance 121 of the second concentrator 12, and the sunlight illuminates through the first concentrator 11 because the sunlight changes direction with the turn of the day. The converging spot on the light entrance 121 of the second concentrator 12 moves as the turn of the turn. As shown in FIG. 2, FIG. 2 is a schematic diagram of a movement trajectory of a converged spot. The movement trajectory 22 of the converging spot 21 on the light entrance 121 of the second concentrator 12 is generally arcuate.

[0036] In this embodiment, the light entrance 121 of the second concentrator 12 is generally narrow and long, and the edge of the light entrance 121 includes a long side and a short side, and the sunlight is incident on the second concentrator 12. The converging spot formed on the optical port 121 moves on the light entrance 121, and the velocity of each engraved movement of the converging spot on the long side is greater than that on the short side.

[0037] It should be noted that, in this embodiment, the long side and the short side of the light entrance 121 are not necessarily straight lines, and the long side may be a straight line, the short side is a curve, or the long side is a curve, and the short side is short. The edges are straight lines, or both the long and short sides are curved. And the long side and the short side can be a smooth transition or a non-smooth transition.

[0038] In this embodiment, the second concentrator 12 is disposed between the first concentrator and the optical fiber in the light collecting system, so that the concentrated spot of the sunlight collected by the first concentrator 11 can be coupled. In the optical fiber 13 , the solar light can be transmitted into the optical fiber 13 without changing the incident port area of the optical fiber 13; in addition, the moving trajectory of the spot concentrated by the first concentrator 11 is curved. The light entrance 121 of the second concentrator 12 is generally narrow and long, and the edge of the light entrance 121 includes a long side and a short side, and the sunlight is concentrated on the light entrance 121 of the second concentrator 12. The spot moves on the light entrance 121, and the velocity of each of the squeezing movements on the long side is greater than the component on the short side; this ensures that the moving trajectory of the concentrated spot completely falls on the second concentrator 12 The same in the light entrance 121 reduces the area of the light entrance 121 of the second concentrator 12, so that the light collecting system can extend the daylight output of the light collecting system while the light collecting system is stationary, and increase Light collection system Flux lose.

In this embodiment, the light exit 122 of the second concentrator 12 is coupled to the optical fiber 13 to transmit sunlight into the optical fiber 13. Specifically, the second concentrator 12 can be coupled to a fiber. Preferably, the light exit 122 of the second concentrator 12 is smaller than the incident end surface 31 of the optical fiber 13 so that the sunlight collected by the second concentrator 12 can be completely transmitted into the optical fiber 13. For example, the incident end face 31 of the optical fiber 13 is circular, and the light exit 122 of the second concentrator 12 is a square inscribed with the incident end face 31 of the optical fiber 13.

[0040] Alternatively, the second concentrator 12 may also be coupled to at least two optical fibers. Preferably, at least two optical fibers are inserted The end faces 31 are closely spliced to each other, and the area of the light exit 122 of the second concentrator 12 is smaller than the area enclosed by the edges of the incident end faces 31 of at least two optical fibers, so that the sunlight collected by the second concentrator 12 can be as far as possible. More access to the fiber 13 is transmitted. For example, as shown in FIG. 3, FIG. 3 is a schematic view of the light exit 122 of the second concentrator 12 and the incident end face 31 of the optical fiber 13. The light exit 122 of the second concentrator 12 is coupled to the four optical fibers, wherein the incident end faces 31 of the four optical fibers are all circular, and the two ends are closely spliced. The light exit 122 of the second concentrator 12 has a square shape, and each vertex of the light exit port 122 is located on the edge of the incident end surface 31 of one optical fiber.

[0041] In this embodiment, the shape of the light entrance port 121 may be regular or irregular. For example, as shown in Figures 4, 5 and 6, Figures 4, 5 and 6 are schematic views of the shape of the light entrance 121 of the second concentrator 12 in the light collecting system of Figure 1 respectively. In this embodiment, the light entrance 121 of the second concentrator 12 has a rectangular or elliptical shape; or the light entrance 121 is elongated, and the long side of the light entrance 121 is translated to the concentrated light spot at the light entrance 121. On the upper moving track 吋, the long side of the light entrance 121 can coincide with the moving track. Of course, the above is merely an example and is not limiting.

[0042] The second concentrator 12 has various configurations. For example, in another embodiment, the second concentrator 12 is composed of a compound parabolic reflector. This reduces the extent to which the solar light increases the amount of optical expansion in the second concentrator 12. Of course, the second concentrator 12 may also be formed by other hollow reflecting surfaces, which is not limited herein.

[0043] In another embodiment, the second concentrator 12 is composed of a transparent medium having a refractive index greater than 1, and the solar light is totally reflected in the second concentrator 12; or, the side of the second concentrator 12 The outer surface of the wall is covered with a reflective film. Thus, the sunlight is reflected from the light entrance port 121 in the second concentrator 12 a plurality of times and then exits from the light exit port 122 into the optical fiber 13.

[0044] Preferably, the second concentrator 12 is composed of a transparent medium having a refractive index greater than 1, and the second concentrator 12 and the optical fiber 1

A transparent medium having a refractive index greater than 1 is filled between the incident end faces 31 of 3. This reduces the interface loss generated by the sunlight between the second concentrator 12 and the optical fiber 13.

[0045] Alternatively, in the case where the second concentrator is a solid body, in another embodiment, preferably, the second concentrator 12 and the optical fiber 13 are integrally formed, so that the second concentrator 12 can be avoided. There is an air gap between the incident end face 31 of the optical fiber 13 to reduce the interface loss.

[0046] In this embodiment, preferably, the first concentrator 11 is a collecting lens, a collecting lens and a second concentrator 12 A field lens (not shown) is further disposed, wherein the focal length of the field lens is equal to the focal length of the collecting lens; the light beam emitted from the first concentrator 11 is incident on the second concentrator 12 after passing through the field lens. Since the field mirror can make the central rays of the different engraved beams parallel to the optical axis, the overall beam divergence angle becomes smaller, thereby reducing the optical expansion of the total incident beam, so that the system can transmit more Luminous flux.

[0047] Preferably, the second concentrator 12 is a solid body, and the second concentrator 12 and the field lens are integrally formed. For example, the light entrance 121 of the second concentrator 12 has a curvature such that the second concentrator 12 also functions as a field lens.

[0048] In this embodiment, the light collecting system may further include an automatic tracking device (not shown) for detecting the position of the concentrated spot on the light entrance 121 of the second concentrator 12, and collecting The light spot is partially or completely removed from the light entrance 121 吋, and the first concentrator 11, the second concentrator 12 and the optical fiber 13 are automatically adjusted to rotate in the same direction as the sunlight changes, so that the optical axes of the first concentrator 11 are parallel. In the sun. Thus, due to the arrangement of the automatic tracking device, the area of the light entrance 121 of the second concentrator 12 can be reduced, further increasing the amount of light that the light collecting system can collect.

[0049] A person skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working process of the system, the device and the unit described above can refer to the corresponding process in the foregoing method embodiment, and details are not described herein again. .

[0050] In the several embodiments provided by the present application, it should be understood that the disclosed system, apparatus, and method may be implemented in other manners. For example, the device embodiments described above are merely illustrative. For example, the division of cells is only a logical function division, and the actual implementation may have another division manner, for example, multiple units or components may be combined or may be integrated. Go to another system, or some features can be ignored, or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be electrical, mechanical or otherwise.

The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that The technical solutions described in the foregoing embodiments may be modified, or some of the technical features may be equivalently replaced; and the modifications or substitutions do not deviate from the spirit and scope of the technical solutions of the embodiments of the present invention. .

Claims

Claim

[Claim 1] A light collecting system, comprising: a first light concentrator sequentially arranged on an optical path

(11), second concentrator (12) and optical fiber (13);

The second concentrator (12) includes an optical entrance (121) and a light exit (122), the light exit (122) is coupled to an optical fiber (13), and the first concentrator (11) is used for Converging sunlight into the light entrance (121) of the second concentrator (12), the second concentrator (12) is configured to collect incident sunlight into the optical fiber (13) for transmission ;

The light entrance port (121) has a narrow strip shape, and the edge of the light entrance port (121) includes a long side and a short side, and sunlight is incident on the light entrance of the second light collector (12). The converging spot formed on the moving light port (121) moves, and the velocity of each of the converging spot moving on the long side is greater than the component on the short side.

[Claim 2] The light collecting system according to claim 1, wherein the light entrance port (121) has a rectangular shape or an elliptical shape;

Or, the long side of the light entrance port (121) is translated to the light collecting spot at the light entrance port (121)

On the moving track 吋, the long side of the light entrance port (121) coincides with the moving track.

[Claim 3] The light collecting system according to claim 1, wherein the light exit port (122) is coupled to a fiber, and the light exit port (122) is smaller than an incident end face of the fiber.

[Claim 4] The light collecting system according to claim 3, wherein an incident end surface of the optical fiber is circular, and the light exit opening (122) is a square inscribed with an incident end surface of the optical fiber.

[Claim 5] The light collecting system according to claim 1, wherein the light exit port (122) is coupled to at least two optical fibers, and the incident end faces of the at least two optical fibers are closely spliced to each other, and the light exiting The area of the port (122) is smaller than the area enclosed by the edges of the incident end faces of the at least two fibers.

[Claim 6] The light collecting system according to claim 1, wherein the second concentrator (12)

) consisting of a composite parabolic concentrator reflecting surface;

Or the second concentrator (12) is composed of a transparent medium having a refractive index greater than 1, and the solar light is totally reflected in the second concentrator (12); Alternatively, the outer surface of the side wall of the second concentrator (12) is covered with a reflective film.

[Attachment 7] The light collecting system according to claim 6, wherein the second concentrator (12)

A transparent medium having a refractive index greater than 1 is filled between the incident end face of the optical fiber (13).

[Claim 8] The light collecting system according to claim 1, wherein the first light collector (11)

a collecting lens, a field lens is further disposed between the collecting lens and the second concentrator (12)

The focal length of the field lens is equal to the focal length of the collecting lens; the light beam emitted by the first concentrator (11) is incident on the second concentrator after passing through the field lens (

12).

[Claim 9] The light collecting system according to claim 8, wherein the second concentrator (12)

) is a solid body, and the second concentrator (12) and the field lens are integrally formed.

[Claim 10] The light collecting system according to claim 1, further comprising an automatic tracking device, wherein the automatic tracking device is configured to detect the concentrated spot in the second concentrator (12) a position on the light entrance port (121), and automatically or partially adjusting the first light collector (11) and the second light collector (12) after the light spot is partially or completely removed from the light entrance port (121) And the optical fiber (13) rotates in the same direction along the direction in which the sunlight changes, such that the optical axis of the first concentrator (11) is parallel to the sunlight.