CN210689812U

CN210689812U - Single photon detection device

Info

Publication number: CN210689812U
Application number: CN201921555469.6U
Authority: CN
Inventors: 不公告发明人
Original assignee: Beijing Zhongchuangwei Nanjing Quantum Communication Technology Co ltd
Current assignee: Beijing Zhongchuangwei Nanjing Quantum Communication Technology Co ltd
Priority date: 2019-09-18
Filing date: 2019-09-18
Publication date: 2020-06-05
Anticipated expiration: 2029-09-18

Abstract

The utility model discloses a single photon detection device, which relates to the technical field of quantum secret communication and comprises a detection module, an integrated shell, a fiber coiling module, a radiator, a fan control panel, a detection cavity upper cover and a fiber coiling cavity upper cover; the integrated shell is provided with a detection cavity, a fiber coiling cavity and a fan cavity, the fan cavity is arranged below the fiber coiling cavity, the detection module is arranged in the detection cavity, the fiber coiling module is arranged in the fiber coiling cavity, and the fan and fan control panel is arranged in the fan cavity; the detection cavity is covered by the detection cavity upper cover, and the fiber coiling cavity is covered by the fiber coiling cavity upper cover; the radiator is arranged below the detection module, and the air outlet of the fan faces the radiator. The single photon detection device has the advantages of integrated shell of a plurality of modules, simple structure, convenience in installation, small size and good heat dissipation effect.

Description

Single photon detection device

Technical Field

The application relates to the technical field of quantum secret communication, in particular to a single photon detection device.

Background

At present, a large number of single photons are adopted as carriers of quantum information in the research of quantum information science, so that a single photon detection technology plays an important role. The single photon detection system can detect single photons carrying quantum information, convert the single photons into electric signals to be output, and extract the quantum information carried by the single photons through means of coincidence measurement, counting and the like.

In the development and design of quantum communication products, a single photon detector usually adopts an avalanche photodiode, the working environment of the avalanche photodiode is a low-temperature environment of-40 to-50 ℃, a refrigeration and heat preservation module which can refrigerate and can keep low temperature all the time needs to be equipped, a radiator module is correspondingly needed to dissipate the heat led out by the refrigeration module, in addition, according to the requirement of system design, the optical fiber connected into the avalanche photodiode needs to be equipped with a tail fiber with a certain length, and a specific optical fiber coiling module is needed to accommodate the tail fiber.

The single photon detection system based on the avalanche photodiode generally needs to comprise the avalanche photodiode, a refrigeration and heat preservation module, a radiator module, an optical fiber disk fiber module and the like, and the existing single photon detection system completely comprising the modules has the disadvantages of large volume, complex structure and inconvenient installation.

SUMMERY OF THE UTILITY MODEL

In order to overcome the above defects of the prior art, the embodiment of the utility model provides a technical problem that will solve provides a single photon detection device, wherein the casing integration, simple structure, simple to operate, small, the radiating effect of a plurality of modules is good.

The embodiment of the utility model provides a concrete technical scheme is:

a single photon detection device comprises a detection module, an integrated shell, a fiber coiling module, a radiator, a fan control panel, a detection cavity upper cover and a fiber coiling cavity upper cover; the integrated shell is provided with a detection cavity, a fiber coiling cavity and a fan cavity, the fan cavity is arranged below the fiber coiling cavity, the detection module is arranged in the detection cavity, the fiber coiling module is arranged in the fiber coiling cavity, and the fan and fan control panel is arranged in the fan cavity; the detection cavity is covered by the detection cavity upper cover, and the fiber coiling cavity is covered by the fiber coiling cavity upper cover; the radiator is arranged below the detection module, and the air outlet of the fan faces the radiator.

Preferably, the air conditioner further comprises an air deflector, and the air deflector is arranged between the fan and the radiator.

Preferably, the fiber coiling chamber further comprises a flange, and the flange is arranged on the outer side wall of the fiber coiling chamber.

Preferably, the integrated housing is integrally formed using one or more of metal materials, and the metal materials include alloys.

Preferably, the detection cavity upper cover and the detection cavity and the fiber coiling cavity upper cover and the fiber coiling cavity are fixed by screws.

Preferably, the detection module comprises an avalanche photodiode, a refrigeration and heat preservation unit and a signal processing circuit, and an electrical interface of the signal processing circuit penetrates through an outer side wall of the detection cavity.

Preferably, an optical fiber through hole is formed in a wall between the detection cavity and the fiber coiling cavity, and the fiber coiling module is close to the optical fiber through hole.

Preferably, the radiator comprises a heat conducting plate and radiating fins, and the airflow direction between the radiating fins in the radiator is consistent with the direction of the air outlet of the fan.

Preferably, a plurality of the fans are transversely arranged in the fan cavity, and the plurality of the fans share one fan control panel.

Preferably, the modules or the parts of the single photon detection device are fixed by screws.

According to the scheme, the single-photon detection device is provided with the detection cavity, the fiber coiling cavity and the fan cavity, the detection module in the single-photon detection device is arranged in the detection cavity, the fiber coiling module is arranged in the fiber coiling cavity, and the fan and fan control panel are arranged in the fan cavity. In addition, the fan and the fan control panel are arranged, and according to the heat dissipation requirements of different degrees, the fan control panel can control the rotating speed of the fan, so that the air quantity supplied by the fan is controlled, and the device has a good heat dissipation effect; in addition, the air deflector is arranged between the fan and the radiator, so that partial turbulence can be avoided, a good ventilation effect between the fan and the radiator is ensured, the airflow direction between the radiating fins in the radiator is consistent with the direction of the air outlet of the fan, and the smoothness of integral heat radiation is ensured.

Specific embodiments of the present invention are disclosed in detail with reference to the following description and the accompanying drawings, which specify the manner in which the principles of the invention may be employed. It should be understood that the embodiments of the present invention are not so limited in scope. The embodiments of the invention include many variations, modifications and equivalents within the spirit and scope of the appended claims. Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments, in combination with or instead of the features of the other embodiments.

Drawings

The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. In addition, the shapes, the proportional sizes, and the like of the respective members in the drawings are merely schematic for helping the understanding of the present invention, and do not specifically limit the shapes, the proportional sizes, and the like of the respective members of the present invention. The skilled person in the art can, under the teaching of the present invention, choose various possible shapes and proportional dimensions to implement the invention according to the specific situation.

FIG. 1 is a schematic perspective view of a single photon detector without a top cover according to the present application;

FIG. 2 is a schematic front view of a single photon detector without a cover according to the present application;

FIG. 3 is a schematic bottom view of a single photon detector of the present application;

FIG. 4 is a perspective view of the integrated housing of the present application;

FIG. 5 is a schematic perspective view of a single photon detector of the present application including a top cover;

FIG. 6 is a schematic cross-sectional view of a single photon detector of the present application;

figure 7 is another cross-sectional schematic view of a single photon detector of the present application.

Detailed Description

The details of the present invention can be more clearly understood with reference to the accompanying drawings and the description of the embodiments of the present invention. However, the specific embodiments of the present invention described herein are for the purpose of explanation only, and should not be construed as limiting the invention in any way. Given the teachings of the present invention, the skilled person can conceive of any possible variants based on the invention, which should all be considered as belonging to the scope of the invention. It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "mounted," "connected," and "connected" are to be construed broadly and may include, for example, mechanical or electrical connections, communications between two elements, direct connections, indirect connections through intermediaries, and the like. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The application provides a single photon detection device, figure 1 is a single photon detection device's that does not contain the upper cover spatial structure sketch map of this application, figure 2 is a single photon detection device's that does not contain the upper cover elevation structure sketch map of this application, figure 3 is a single photon detection device's that this application is looking up the structural sketch map, figure 4 is the spatial structure sketch map of the integrated casing of this application, figure 5 is a single photon detection device's that contains the upper cover spatial structure sketch map of this application, figure 6 is a cross-sectional structure sketch of the single photon detection device of this application, figure 7 is another cross-sectional structure sketch of the single photon detection device of this application. Referring to fig. 1 to 7, a single photon detection device includes a detection module 5, an integrated housing 1, a fiber coiling module 2, a heat sink 4, a fan 71, a fan control board 72, a detection cavity upper cover 9, and a fiber coiling cavity upper cover 8.

The detection module 5 comprises an avalanche photodiode, a refrigeration and heat preservation unit and a signal processing circuit. Specifically, the detection module 5 is a combined module including an avalanche photodiode, a multi-stage semiconductor refrigerator, a photodiode holder, and a signal processing circuit, that is, the refrigeration and heat preservation unit includes a multi-stage semiconductor refrigerator and a photodiode holder. The avalanche photodiode is fixed on the photodiode fixing frame and is refrigerated through the multistage semiconductor refrigerator. The avalanche photodiode refers to a photosensitive element used in optical communication, which can amplify a photoelectric signal by utilizing an avalanche multiplication effect of carriers to improve the sensitivity of detection; the multistage semiconductor refrigerator is preferably a 4-stage refrigeration semiconductor refrigeration chip; the photodiode fixing frame is used for fixing the avalanche photodiode, is made of metal, is of a clamping structure, is directly attached to the cold surface of the multistage semiconductor refrigerator, and is fixed with the multistage semiconductor refrigerator through screws; the signal processing circuit is electrically connected with the avalanche photodiode, and the connection combination of the avalanche photodiode and the signal processing circuit can realize the functions of converting optical signals into electric signals and processing weak signals.

The optical fiber pigtail that the fine module 2 of dish is used for acceping avalanche photodiode, it includes supporting part and portion of acceping, the portion of acceping sets up on the supporting part, the shape of supporting part is slice square or oval, can set up a plurality of portions of acceping on the supporting part, the quantity of concrete portion of acceping can be selected and adjusted according to the quantity of detecting module 5, this application does not do the restriction here, wherein the portion of acceping comprises four ply-yarn cards again, the permutation position between every two adjacent ply-yarn cards makes the crooked radius of optic fibre equal to or be greater than the crooked minimum curvature radius of optic fibre when normally working, the ply-yarn card includes spacing body, spacing inslot that link up has to spacing groove spacing, be provided with the long and narrow gap with spacing groove intercommunication on spacing body, optic fibre accessible long and narrow gap is.

The fan 71 is used for supplying air to the heat sink 4 to accelerate heat dissipation, and may be a dc or ac fan, which is selected according to cost or volume, and the application is not limited in this respect. The fan control board 72 is electrically connected to the fan 71, and the fan control board 72 can control the rotation speed of the fan 71 according to different heat dissipation requirements, so as to control the amount of air supplied by the fan 71, thereby providing the device with good heat dissipation effect.

Referring to fig. 1, 3 and 6, the heat sink 4 is disposed below the detection module 5, and an outlet of the fan 71 faces the heat sink 4. The radiator 4 is used for radiating heat of the detection module 5, the multistage semiconductor refrigerator is provided with a cold surface and a hot surface which are opposite, and the heat of the hot surface needs to be radiated through the radiator 4; the radiator 4 comprises a heat conducting plate and radiating fins, the heat conducting plate and the radiating fins are made of metal materials and are integrally formed, the heat conducting plate of the radiator 4 is tightly attached to the hot surface of the multistage semiconductor refrigerator, the heat conducting plate transfers the heat of the hot surface to the radiating fins of the radiator 4, the airflow direction between the radiating fins in the radiator 4 is consistent with the direction of the air outlet of the fan 71, and the smoothness of integral heat dissipation is guaranteed.

Referring to fig. 4, the integrated housing 1 is provided with a detection cavity 11, a fiber coiling cavity 12 and a fan cavity 13, the fan cavity 13 is disposed below the fiber coiling cavity 12, the detection module 5 is disposed in the detection cavity 11, the fiber coiling module 2 is disposed in the fiber coiling cavity 12, and the fan 71 and the fan control board 72 are disposed in the fan cavity 13. Specifically, the integrated housing 1 is integrally formed using one or more of metal materials including alloys such as aluminum, aluminum alloys, iron, or steel. Referring to fig. 4, the detection cavity 11 and the fiber coiling cavity 12 are rectangular box bodies, and are arranged in a transverse direction, a middle metal shell wall is a boundary line of the two, the middle metal shell wall is provided with an optical fiber through hole, and the fiber coiling module 2 is arranged in the fiber coiling cavity 12 and is close to the optical fiber through hole. An electrical interface of a signal processing circuit of the detection module 5 passes through an outer side shell wall of the detection cavity 11, specifically, the signal processing circuit is connected with the electrical interface, the electrical interface is used for electrically connecting the single photon detection device with external communication equipment, a through hole is formed in the outer side shell wall of the detection cavity 11, and the electrical interface passes through the through hole. The heat sink 4 is disposed below the detection module 5 and independently disposed below the detection cavity 11.

Referring to fig. 5, the detection cavity upper cover 9 and the fiber coiling cavity upper cover 8 are both metal cover plates, the shape and size of the cover plates correspond to the shape and size of the openings of the detection cavity 11 and the fiber coiling cavity 12 respectively, the detection cavity upper cover 9 is used for sealing the detection cavity 11, the fiber coiling cavity upper cover 8 is used for sealing the fiber coiling cavity 12, the sealing cover means sealing cover, a sealing ring groove is formed in the wall of the detection cavity 11 around the detection cavity for placing a sealing ring, the detection cavity upper cover 9 covers the detection cavity 11 and is fixedly connected with the detection cavity 11 through screws, and similarly, the fiber coiling cavity upper cover 8 covers the fiber coiling cavity 12 and is fixedly connected with the detection cavity through screws.

The sealed cavity formed by the sealed connection of the detection cavity 11 and the detection cavity upper cover 9 also comprises a heat insulation filler, and the heat insulation filler has the main function of heat insulation and heat preservation, and can reduce the heat exchange between the temperature in the sealed cavity and the external environment temperature of the cavity. The heat insulation filler is one or more of heat insulation materials such as foam beads, aerogel, heat insulation cotton and vacuum heat insulation plates, and is used for filling the residual space of the sealed cavity formed by the detection cavity 11 and the detection cavity upper cover 9.

Referring to fig. 1 to 7, the single photon detection device further includes a flange 3, and the flange 3 is disposed on an outer side wall of the fiber winding cavity 12. The flange is a part for connecting the shafts and is used for connecting pipe ends; there are also flanges on the inlet and outlet of the device for connection between two devices. Specifically, a through hole is formed in the outer side wall of the fiber coiling cavity 12, and the through hole is used for installing the flange 3. The flange 3 is used for fixedly connecting two optical fiber connectors, the tail end or the head end of an optical fiber is generally provided with the optical fiber connector, the optical fiber connector connected into the tail end of the optical fiber of the single photon detection device is fixed at a flange port outside the device, the optical fiber connector connected into the head end of the optical fiber of the fiber coiling module 2 is fixed at a flange port inside the device, the single photon detection device can comprise a plurality of flanges 3, and the number of the flanges 3 is consistent with the number of the avalanche photodiodes in the system. Specifically, the optical fiber connected to the single photon detection device enters the inside of the device after passing through the flange 3, passes through the optical fiber coiling and accommodating of the optical fiber coiling module 2, and is finally connected to the avalanche photodiode in the device.

The module and the module of the single photon detection device or the component and the component are fixedly connected by screws, for example, the detection module 5 and the detection cavity 11, the fiber coiling module 2 and the fiber coiling cavity 12, the fan 71 and the fan cavity 13 are fixedly connected by screws, and can be connected by bonding, riveting or clamping, and the like, preferably, the screws are selected, so that the screws are convenient to detach, the sealing performance is good, the fixation is firm, and the single photon detection device can keep good stability even if shaking occurs.

Through the embodiment, the shell integration of a plurality of modules of the single photon detection device is realized, the overall structure of the single photon detection device is simplified, the single photon detection device is simple and compact, the size is small, the single photon detection device is convenient to mount and dismount, and the detection device can be conveniently moved and maintained through the integration of the module assembly.

Referring to fig. 4, 6 and 7, the fan 71 and the fan control board 72 are disposed in the fan cavity 13, specifically, the fan control board 72 and the fan 71 are arranged side by side, and the fan control board 72 is disposed at a top position of the fan cavity 13 near the heat sink 4. Referring to fig. 4 and 7, a plurality of fans 71 may be accommodated in the rectangular parallelepiped fan chamber 13, and the plurality of fans 71 share one fan control board 72 and are arranged in the fan chamber 13 in a lateral direction.

Referring to fig. 3 and 6, the single photon detection device further includes an air guide plate 6, the air guide plate 6 is disposed between the fan 71 and the heat sink 4, specifically, the air guide plate 6 is made of plastic or metal sheet, and is disposed below the fan control plate 72 and inclined upward toward the fan direction, and the cross-sectional area of the air outlet of the fan 71 is larger than the cross-sectional area of the air inlet of the heat sink 4, so that the air guide plate 6 arranged obliquely upward can guide the air blown out by the fan 71 to directly flow toward the heat sink 4, and thus, partial turbulent flow influence can be avoided.

Through the embodiment, the fan and the fan control board are arranged in the device, and the fan control board can control the rotating speed of the fan according to the heat dissipation requirements of different degrees, so that the air quantity supplied by the fan is controlled, and the device has a good heat dissipation effect; in addition, the air deflector is arranged, so that partial turbulence can be avoided, a good ventilation effect between the fan and the radiator is ensured, the airflow direction between the radiating fins in the radiator is consistent with the air outlet direction of the fan, and the smoothness of the integral heat radiation of the device is ensured.

Referring to fig. 1 to 7, the modules or the parts of the single photon detection device are fixed by screws. The single photon detection device provided by the application can adopt a plurality of sets of the detection modules 5 simultaneously as required to realize the purpose of simultaneously detecting a plurality of avalanche photodiodes. In a possible implementation manner, referring to fig. 1 to 7, a single photon detection apparatus includes four detection modules 5, the four detection modules 5 are placed side by side in a detection cavity 11, and correspondingly include four avalanche photodiodes and four flanges 3, six fans 71 are provided according to the size of a heat sink 5, and the four avalanche photodiodes in the apparatus can work simultaneously and can also be divided into different detection modes.

The present application has been described in detail with reference to specific embodiments and illustrative examples, but the description is not intended to limit the application. Those skilled in the art will appreciate that various equivalent substitutions, modifications or improvements may be made to the presently disclosed embodiments and implementations thereof without departing from the spirit and scope of the present disclosure, and these fall within the scope of the present disclosure. The protection scope of this application is subject to the appended claims.

Claims

1. A single photon detection device is characterized by comprising a detection module (5), an integrated shell (1), a fiber coiling module (2), a radiator (4), a fan (71), a fan control panel (72), a detection cavity upper cover (9) and a fiber coiling cavity upper cover (8);

the integrated shell (1) is provided with a detection cavity (11), a fiber coiling cavity (12) and a fan cavity (13), the fan cavity (13) is arranged below the fiber coiling cavity (12), the detection module (5) is arranged in the detection cavity (11), the fiber coiling module (2) is arranged in the fiber coiling cavity (12), and the fan (71) and a fan control panel (72) are arranged in the fan cavity (13);

the detection cavity upper cover (9) covers the detection cavity (11), and the fiber coiling cavity upper cover (8) covers the fiber coiling cavity (12);

the radiator (4) is arranged below the detection module (5), and an air outlet of the fan (71) faces the radiator (4).

2. The single photon detection device according to claim 1, further comprising an air deflector (6), said air deflector (6) being arranged between said fan (71) and said heat sink (4).

3. The single photon detector of claim 1 further comprising a flange (3), said flange (3) being disposed on an outer wall of said disc fiber chamber (12).

4. The single photon detection device according to claim 1, characterized in that said unitary housing (1) is integrally formed in one or more of metallic materials, said metallic materials comprising alloys.

5. The single photon detector of claim 1 in which said detection chamber upper cover (9) and said detection chamber body (11) and said fiber winding chamber upper cover (8) and said fiber winding chamber body (12) are fixed by screws.

6. The single photon detection device according to claim 1, characterized in that said detection modules (5) comprise avalanche photodiodes, a refrigeration and thermal insulation unit and a signal processing circuit, the electrical interface of which passes through the outer lateral walls of said detection chamber (11).

7. The single photon detector of claim 1 in which said detection chamber (11) and said fiber winding chamber (12) have optical fiber through holes in their walls, said fiber winding module (2) being in close proximity to said optical fiber through holes.

8. The single photon detector of claim 1, characterized in that said heat sink (4) comprises a heat conducting plate and heat radiating fins, the direction of the air flow between the heat radiating fins of said heat sink (4) being aligned with the direction of the outlet of said fan (71).

9. The single photon detector of claim 1, characterized in that a plurality of said fans (71) are arranged laterally in said fan chamber (13), a plurality of said fans (71) sharing one said fan control board (72).

10. The single photon detector of any one of claims 1 to 9, wherein said modules or said parts of said single photon detector are fixed to each other by screws.