Waveguide optical wand penetrating permalloy shielding layer, array group and light guide illumination system

Abstract

The utility model discloses a waveguide optical wand penetrating through a permalloy shielding layer, an array group and a light guide illumination system. The waveguide optical rod is composed of an outer waveguide tube and an inner silicon dioxide multimode optical fiber preform; a reflective coating is arranged between the waveguide tube and the optical fiber preform, and the waveguide optical rod is in a regular hexagonal prism shape. The light guide illumination system comprises a waveguide light bar array group composed of waveguide light bars and light guide illumination system light guide pipes on the two sides of the shielding layer. According to the utility model, the influence of external magnetic field invasion can be reduced as much as possible, and the problem of light penetration efficiency of the light guide illumination system at the permalloy shielding layer position of the ultra-large type extremely weak magnetic environment test room is effectively solved.

Description

Technical Field

[0001] The utility model relates to the technical field of light-guided lighting in an extremely weak magnetic test environment, in particular to a waveguide light rod, an array group and a light-guided lighting system that passes through a Permalloy shielding layer. Background Art

[0002] The extremely weak magnetic environment is an extremely weak magnetic area achieved by shielding the earth's magnetic field and other electromagnetic fields as much as possible through various means. The existing extremely weak magnetic environment in the world is basically at the test cabin level, and the residual magnetism is 10nT level. There are no electrical circuits inside, or only weak DC measurement and control circuits. After the above circuits pass through high magnetic flux pipelines, their electromagnetic influence on the test cabin can be ignored. With the needs of defense, aviation, aerospace, medical and other aspects, the establishment of a unified ultra-large extremely weak magnetic environment test room (residual magnetism is 10nT~1nT level) has been put on the agenda in the future. For the lighting needs inside such ultra-large extremely weak magnetic environment test rooms, the electromagnetic influence of traditional light sources on the surrounding extremely weak magnetic environment cannot be ignored. One solution is to use optical lighting, set the light source outside the shielding layer of the ultra-large extremely weak magnetic environment test room (generally composed of multiple layers of Permalloy), and guide the light emitted by the light source into the interior of the test room through a suitable light guide system, and then achieve the lighting effect through suitable terminal lamps. However, since the Permalloy shielding layer must not only shield the static magnetic field, but also shield the surrounding high-frequency magnetic field such as 5G signals, it is necessary to use a cutoff waveguide as an introduction to wind, water, electricity, lighting and other systems, or to perform corresponding treatments.

[0003] Regarding the use of cutoff waveguides, the current technical problems include: traditional waveguides have extremely high requirements for the directivity of light when used directly for optical transmission, and are difficult to be directly applied to optical lighting systems in extremely weak magnetic environments; in the current 5G signal frequency band, in order to achieve an interference frequency f that is much smaller than the lowest cutoff frequency fc of the waveguide and to achieve a relatively ideal attenuation capability for the interference magnetic field, the waveguide diameter is generally required to be no more than a few centimeters, while the optical transmission efficiency of traditional light guides is positively correlated to their diameter, which is generally hundreds of centimeters, making implementation plans difficult; and when using waveguide arrays, the issue of available light cross-section also needs to be considered. Utility Model Content

[0004] The purpose of the utility model is to provide a waveguide light rod to solve the problem of light transmission directivity when the traditional waveguide is used for light transmission through the Permalloy shielding layer in an extremely weak magnetic environment; at the same time, the waveguide light rod is used to provide an array group and a light guide lighting system, so that the light guide lighting system can reduce the intrusion of the external magnetic field as much as possible when passing through the Permalloy shielding layer of a super-large extremely weak magnetic environment test room, and improve the light transmission efficiency. The purpose of the utility model is achieved through the following technical solutions:

[0005] A waveguide rod passing through a permalloy shielding layer, the waveguide rod consists of an outer waveguide tube and an inner silica multimode optical fiber preform rod; a reflective coating is provided between the waveguide tube and the optical fiber preform rod, the waveguide rod is in the shape of a regular hexagonal prism, and the cross sections of the waveguide tube and the optical fiber preform rod are both regular hexagonal.

[0006] For further optimization, the diameter of the circumscribed circle of the inner wall of the waveguide tube does not exceed 2 cm and the length of the waveguide tube is not less than 4 cm.

[0007] Furthermore, the diameter of the circumscribed circle of the inner wall of the waveguide tube does not exceed 1 cm.

[0008] The waveguide rod array group is composed of the waveguide rods, and the waveguide rod array group is composed of no less than 7 waveguide rods arranged, the upper and lower bottom surfaces of each waveguide rod are aligned, and the outer walls of adjacent waveguide rods are in contact with each other.

[0009] According to further optimization, the overall outer contour of the waveguide light rod array group is a regular hexagonal prism.

[0010] A light guide lighting system that passes through a permalloy shielding layer comprises a waveguide light rod array group, a light guide pipe of the light guide lighting system outside the shielding layer, and a light guide pipe of the light guide lighting system inside the shielding layer; the waveguide light rod array group passes through an outer permalloy shielding layer and an inner permalloy shielding layer, the inner end of the waveguide light rod array group is connected to the light guide pipe of the light guide lighting system inside the shielding layer, and the outer end of the waveguide light rod array group is connected to the light guide pipe of the light guide lighting system outside the shielding layer.

[0011] Further optimization, in the light guide lighting system that passes through the Permalloy shielding layer, the end faces of the waveguide light rod array group at both ends can completely cover the end faces of the light guide tubes of the light guide lighting system on both sides.

[0012] The utility model provides a silicon dioxide multimode optical fiber preform rod inside the waveguide tube, and utilizes the total reflection physical property of the optical fiber preform rod that light incident at one end that does not exceed a certain angle can be transmitted almost losslessly to the other end after multiple total reflections inside the fiber preform rod, thereby achieving the optical path transmission effect.

[0013] Considering that the inner diameter of a single waveguide is much smaller than the inner diameter required for the optical waveguide lighting light pipe, the waveguide light rod of the utility model needs to be used in an array in actual use. An array composed of multiple waveguide light rods can meet the connectivity and light path propagation of the optical waveguide lighting system on both sides of the Permalloy shielding layer, thereby realizing the passage of the optical waveguide lighting system at the shielding layer.

[0014] Conventional circular waveguide rods have the advantage of simple production, but the internal area of ​​the waveguide tube of the array composed of multiple circular waveguide rods accounts for a relatively low proportion of the total area. At the same time, considering the incident angle requirements of the optical fiber preform for the fully reflected light, the larger the angle between the peripheral edges, the better. Therefore, the ideal waveguide rod cross-section that takes into account the above requirements is preferably a regular hexagon. When actually used, it is arranged in a honeycomb array, which greatly improves the available light cross-section.

[0015] Beneficial effects of the utility model:

[0016] The waveguide light rod of the utility model can solve the light transmission directivity and efficiency problems of the light guide lighting system in the traditional waveguide. The utility model can effectively solve the light transmission efficiency problem of the light guide lighting system in the Permalloy shielding layer position of the ultra-large and extremely weak magnetic environment test room while minimizing the impact of external magnetic field intrusion. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0018] Figure 1 This is a schematic diagram of the structure of the waveguide light rod of the utility model;

[0019] Figure 2 This is a schematic diagram of the structure of an array group composed of waveguide light rods of the utility model;

[0020] Figure 3 Schematic diagram of the structure of the light-guiding lighting system that passes through the Permalloy shielding layer.

[0021] 1. Waveguide; 2. Optical fiber preform; 3. Outer Permalloy shielding layer; 4. Inner Permalloy shielding layer; 5. Light guide tube of optical lighting system outside the shielding layer; 6. Light guide tube of optical lighting system inside the shielding layer. DETAILED DESCRIPTION

[0022] Example 1

[0023] like Figure 1 As shown, a waveguide rod passing through a permalloy shielding layer is composed of an outer waveguide tube 1 and an inner silica multimode optical fiber preform rod 2; a reflective coating is provided between the waveguide tube 1 and the optical fiber preform rod 2, the waveguide rod is in the shape of a regular hexagonal prism, and the cross-sections of the waveguide tube 1 and the optical fiber preform rod 2 are both regular hexagonal.

[0024] The purity of the silica in the silica multimode optical fiber preform in this embodiment is higher than 99.9999%. The reflective coating can be made of any reflective coating with a high reflectivity formula, such as aluminum-based reflective coating.

[0025] In this embodiment, the diameter of the circumscribed circle of the inner wall of the waveguide 1 is not more than 2 cm, preferably 1 cm, and the length of the waveguide 1 is not less than 4 cm. The length of the waveguide is equal to that of the optical fiber preform.

[0026] Example 2

[0027] like Figure 2 As shown, the waveguide rod array group composed of the waveguide rods described in Example 1 is composed of no less than 7 waveguide rods arranged in an array, the upper and lower bottom surfaces of each waveguide rod are aligned, and the outer walls of adjacent waveguide rods are in contact with each other.

[0028] Since the inner diameter of a single waveguide rod is much smaller than the inner diameter required for a light guide lighting light pipe, multiple regular hexagonal waveguide rods arranged in an array are required to meet the use requirements. The recommended array structure is a regular hexagonal prism, where the more waveguide rods there are, the easier it is for the overall outline to approach a standard regular hexagonal prism.

[0029] Example 3

[0030] like Figure 3 As shown, a light guide lighting system that passes through a permalloy shielding layer comprises the waveguide light rod array group described in Example 2, a light guide pipe 5 of the light guide lighting system outside the shielding layer, and a light guide pipe 6 of the light guide lighting system inside the shielding layer; the waveguide light rod array group passes through the outer permalloy shielding layer 3 and the inner permalloy shielding layer 4, the inner end of the waveguide light rod array group is connected to the light guide pipe 6 of the light guide lighting system inside the shielding layer, and the outer end of the waveguide light rod array group is connected to the light guide pipe 5 of the light guide lighting system outside the shielding layer. The end faces at both ends of the waveguide light rod array group can completely cover the end faces of the light guide pipes of the light guide lighting system on both sides. In actual use, the diameter of the inscribed circle of the waveguide light rod array group should be slightly larger than the inner diameter of the light guide pipe designed for the light guide lighting system to achieve the maximum possible transmission of light. The connection between the waveguide light rod array group and the light guide pipes of the light guide lighting system on both sides is smoothly encapsulated with a high-reflection metal film.

[0031] Finally, it should be noted that the above is only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model is described in detail with reference to the preferred arrangement scheme, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model.

Claims

1. A waveguide light rod passing through a permalloy shielding layer, characterized in that: The waveguide rod is composed of an outer waveguide tube (1) and an inner silica multimode optical fiber preform rod (2); a reflective coating is provided between the waveguide tube (1) and the optical fiber preform rod (2); the waveguide rod is in the shape of a regular hexagonal prism; and the cross-sections of the waveguide tube (1) and the optical fiber preform rod (2) are both regular hexagonal.

2. The waveguide light rod passing through the permalloy shielding layer according to claim 1, characterized in that: The diameter of the circumscribed circle of the inner wall of the waveguide (1) does not exceed 2 cm, and the length of the waveguide (1) is not less than 4 cm.

3. The waveguide light rod passing through the permalloy shielding layer according to claim 2, characterized in that: The diameter of the circumscribed circle of the inner wall of the waveguide (1) does not exceed 1 cm.

4. A waveguide light rod array group composed of the waveguide light rods according to any one of claims 1 to 3, characterized in that: The waveguide light rod array group is composed of no less than 7 waveguide light rods arranged in an arranged manner, the upper and lower bottom surfaces of each waveguide light rod are aligned, and the outer walls of adjacent waveguide light rods are in contact with each other.

5. The waveguide light rod array group composed of waveguide light rods according to claim 4, characterized in that: The overall outer contour of the waveguide light rod array group is a regular hexagonal prism.

6. A light guide lighting system passing through a permalloy shielding layer, characterized in that: The invention comprises the waveguide light rod array group as claimed in claim 4, a light guide pipe (5) of a light guide lighting system outside the shielding layer, and a light guide pipe (6) of a light guide lighting system inside the shielding layer; the waveguide light rod array group passes through an outer permalloy shielding layer (3) and an inner permalloy shielding layer (4); the inner end of the waveguide light rod array group is connected to the light guide pipe (6) of the light guide lighting system inside the shielding layer, and the outer end of the waveguide light rod array group is connected to the light guide pipe (5) of the light guide lighting system outside the shielding layer.

7. The light-guiding lighting system passing through the permalloy shielding layer according to claim 6, characterized in that: The end faces at both ends of the waveguide light rod array group can completely cover the end faces of the light guide pipes of the light guide lighting system on both sides.

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