Multi-channel combined light path structure

Abstract

The utility model discloses a multi-channel combined light path structure, which comprises a device shell, a built-in groove is arranged in the device shell, an upper cover is fixedly connected to the top of the built-in groove of the device shell, a dichroscope is arranged on the inclined surface of the built-in groove, a reflecting mirror is arranged on the inclined surface of the inner wall of the upper cover, and a light source is arranged in the reflecting mirror. A built-in groove is formed in the device shell, a plurality of mounting holes communicated with the built-in groove are formed in one side of the device shell, an optical fiber connector and a lens are mounted in each mounting hole, a mounting groove is formed in the bottom of the device shell, a circuit board is mounted in the mounting groove, a plurality of photoelectric detectors and light-emitting diodes are arranged on the circuit board, and the photoelectric detectors and the light-emitting diodes are arranged in the mounting groove. According to the utility model, the consistency of processing photoelectric information by each channel light path is improved, the integration level and the convenience are improved, the production cost is reduced through the processing technology of combining die casting and finish machining, the product consistency is enhanced, and the device is suitable for mass production.

Description

Technical Field

[0001] The utility model relates to the technical field of fluorescent optical fiber temperature measurement, in particular to a multi-channel combined optical path structure. Background Art

[0002] In recent years, fluorescent fiber temperature sensing technology has attracted much attention due to its advantages such as high reliability, compact design, high precision, strong anti-interference and long life. In the face of complex environmental conditions, such as multiple electromagnetic interference, high voltage, high temperature and strong corrosion, traditional electrical temperature sensing technology has shown limitations, so fluorescent fiber temperature sensing technology has become a more reliable and applicable choice. For example, its application in hot spot monitoring of power equipment, microwave industry, radio frequency hyperthermia, MRI and plasma experiments has been widely recognized. With the continuous development of this technology, related equipment has also been continuously improved and optimized to meet the growing application needs, especially in sensing systems.

[0003] In the current fluorescent fiber temperature sensing system, the fluorescent temperature interrogator is crucial, and its internal optical path structure is a key component. The temperature interrogators on the market usually use single-channel optical path devices, and multiple single-channel optical paths are combined into a multi-channel interrogator. The typical optical path design includes using a light-emitting diode as an excitation light source, focusing the light onto the access optical fiber through filters and lenses, transmitting it to the position of the fluorescent material, and then transmitting the fluorescent feedback light back to the interrogator, and demodulating the temperature data through a photoelectric detector. Although the single-channel optical path composite device has the advantages of independent temperature measurement and no mutual interference, its assembly is complex and the testing is cumbersome. The slight difference in the transmission path between the optical path devices leads to inconsistent accuracy of photoelectric information transmission. Each single-channel optical path composite device needs to be connected to the interrogator and optical fiber through an independent interface. Loose interfaces may cause signal interruption.

[0004] Therefore, there is an urgent need to design a multi-channel optical path compound device to improve the accuracy and stability of the optical path compound device, simplify the assembly process, and optimize the interface design to improve the overall performance and reliability of the system. Utility Model Content

[0005] 1. Technical problems to be solved by the utility model

[0006] In view of the shortcomings of the prior art, the purpose of the utility model is to provide a multi-channel combined optical path structure, improve the consistency of photoelectric information processed by each channel optical path, improve integration and convenience, reduce production costs through a processing technology that combines die-casting and fine machining, enhance product consistency, and be suitable for mass production.

[0007] 2. Technical solution

[0008] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0009] A multi-channel combined optical path structure comprises a device shell, wherein a built-in groove is arranged inside the device shell, an upper cover is fixedly connected to the top of the built-in groove of the device shell, a dichroic mirror is installed on the inclined surface of the built-in groove, a reflector is installed on the inclined surface of the inner wall of the upper cover, a plurality of mounting holes communicating with the built-in groove are provided on one side of the device shell, an optical fiber connector and a lens are installed in each of the mounting holes, a mounting groove is provided at the bottom of the device shell, a circuit board is installed in the mounting groove, a plurality of photodetectors and light-emitting diodes are arranged on the circuit board, a first through hole for installing the photodetector and a second through hole for installing the light-emitting diode are provided on the device shell, the first through hole and the second through hole pass through the mounting groove and the built-in groove, wherein a group of the optical fiber connector, lens, photodetector, light-emitting diode, dichroic mirror and reflector form a channel optical path.

[0010] Preferably, the photodetector and the light emitting diode are pre-soldered on a circuit board.

[0011] Preferably, the circuit board is fixedly installed in the installation groove by screws, and a bottom cover is clamped in the installation groove and located at the bottom of the circuit board.

[0012] Preferably, the mounting hole comprises a first step hole, a second step hole and a third step hole which are sequentially arranged along the direction of the optical fiber connector toward the dichroic mirror, the diameters of the first step hole, the second step hole and the third step hole decrease sequentially and are interconnected, the third step hole is connected to the built-in groove, the inner wall of the first step hole is provided with an internal thread, the outer wall of the optical fiber connector is provided with an external thread, the optical fiber connector is installed in the first step hole through the external thread and the internal thread, and the lens is installed in the second step hole.

[0013] Preferably, a rubber ring is installed between the optical fiber connector and the lens.

[0014] Preferably, the dichroic mirror and the reflector are arranged in parallel, and the angle between the dichroic mirror and the reflector and the horizontal plane is 45°.

[0015] Preferably, a first clamping groove is provided on the inclined surface of the built-in groove, and the dichroic mirror is clamped in the first clamping groove; a second clamping groove is provided on the inclined surface of the inner wall of the upper cover, and the reflector is clamped in the second clamping groove.

[0016] Preferably, the device housing is integrally formed by die-casting.

[0017] Preferably, the photodetector is a photodetector with a focusing lens.

[0018] 3. Beneficial effects

[0019] Compared with the prior art, the beneficial effects of the utility model are:

[0020] (1) The utility model ensures that the transmission and reflection angles of the light transmission paths are consistent by using a dichroic mirror and a reflector shared by multiple channel optical paths, thereby improving the consistency of photoelectric information processed by each channel optical path, and having good interchangeability of external optical fibers, making installation easier.

[0021] (2) The utility model pre-solders the photoelectric detector and the light-emitting diode on the circuit board, and embeds the circuit board inside the device housing. The two devices share a circuit board and are on the same plane. The circuit structure is integrated, highly integrated, and easy to assemble, thereby improving integration and convenience. The device housing is integrally formed by die-casting, and slots for installing dichroic mirrors and reflective mirrors are provided on the device housing. The processing technology combining die-casting and fine machining reduces production costs, enhances product consistency, and is suitable for mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the multi-channel combined optical path structure;

[0023] Figure 2 It is a schematic diagram of the split structure of the multi-channel combined optical path structure;

[0024] Figure 3 Schematic diagram of the internal structure of the multi-channel combined optical path structure.

[0025] In the figure: 1. device housing; 101. built-in groove; 102. mounting hole; 1021. first step hole; 1022. second step hole; 1023. third step hole; 2. upper cover; 3. dichroic mirror; 4. reflector; 5. optical fiber connector; 6. rubber ring; 7. lens; 8. circuit board; 9. photodetector; 10. light-emitting diode; 11. bottom cover. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0027] Example:

[0028] See also Figure 1-Figure 3The present embodiment provides a multi-channel combined optical path structure, including a device housing 1, a built-in groove 101 is arranged inside the device housing 1, a top cover 2 is fixedly connected to the top of the built-in groove 101 of the device housing 1, and the top cover 2 is fixedly mounted on the device housing 1 by screws, a dichroic mirror 3 is mounted on the inclined surface of the built-in groove 101, and a reflector 4 is mounted on the inclined surface of the inner wall of the top cover 2, a plurality of mounting holes 102 communicating with the built-in groove 101 are opened on one side of the device housing 1, and a fiber optic connector 5 and a lens 7 are installed in each mounting hole 102, a mounting groove is opened at the bottom of the device housing 1, a circuit board 8 is installed in the mounting groove, and a plurality of photodetectors 9 and light-emitting diodes 10 are arranged on the circuit board 8, a first through hole for installing the photodetector 9 and a second through hole for installing the light-emitting diode 10 are opened on the device housing 1, and the first through hole and the second through hole penetrate the mounting groove and A built-in groove 101, wherein the number of optical fiber connectors 5, lenses 7, photodetectors 9 and light-emitting diodes 10 is the same and their positions correspond one to one. A group of optical fiber connectors 5, lenses 7, photodetectors 9, light-emitting diodes 10, dichroic mirrors 3 and reflectors 4 form a channel optical path. The number of channel optical paths can be designed according to actual needs to achieve more optical channel combinations. The implementation principle of the channel optical path is that the excitation light generated by the light-emitting diode 10 is reflected by the reflector 4 and transmitted by the dichroic mirror 3, and is focused by the lens 7 and transmitted to the optical fiber connector 5 and the external optical fiber. The feedback light from the optical fiber connector 5 and the external optical fiber is focused by the lens 7 and reflected by the dichroic mirror 3, and is sent to the corresponding photodetector 9 for processing. Multiple channel optical paths share a dichroic mirror 3 and a reflector 4 to ensure that the transmission and reflection angles of the light transmission route are consistent, thereby improving the consistency of photoelectric information processed by each channel optical path.

[0029] In this embodiment, if Figure 2 and Figure 3 As shown, the photodetector 9 and the light-emitting diode 10 are pre-soldered on the circuit board 8, and the circuit board 8 is fixed in the installation groove by screws. A bottom cover 11 is clamped in the installation groove and located at the bottom of the circuit board 8. The circuit board 8 with the photodetector 9 and the light-emitting diode 10 can be embedded in the device housing 1, sharing a circuit board 8 and on the same plane. The circuit structure is integrated, highly integrated, and easy to assemble, which improves integration and convenience and is suitable for mass production. It should be noted that a data interface is provided on the circuit board 8 as an external data connection interface.

[0030] In this embodiment, if Figure 3As shown, a first snap-in groove is provided on the inclined surface of the built-in groove 101, and the dichroic mirror 3 is snapped into the first snap-in groove. A second snap-in groove is provided on the inclined surface of the inner wall of the upper cover 2, and the reflector 4 is snapped into the second snap-in groove. It should be noted that the installation angles of the dichroic mirror 3 and the reflector 4 are to ensure the angles of reflection of the excitation light by the reflector 4 and transmission of the dichroic mirror 3. Preferably, the dichroic mirror 3 and the reflector 4 are arranged in parallel, and the angles between the dichroic mirror 3 and the reflector 4 and the horizontal plane are 45°, which are used to position and assemble the dichroic mirror 3 and the reflector 4. The device housing 1 is integrally formed by die-casting. The overall design of the device housing 1 is an irregular trapezoidal structure with hollow bottom and oblique sides, with a bottom opening and an oblique opening. The structure is unified, high-volume production is possible, cost is reduced, and production is convenient. The processing technology combining die-casting and fine machining reduces production costs and enhances product consistency.

[0031] In this embodiment, if Figure 2 and Figure 3 As shown, the mounting hole 102 includes a first step hole 1021, a second step hole 1022 and a third step hole 1023 which are sequentially arranged along the direction of the optical fiber connector 5 toward the dichroic mirror 3. The diameters of the first step hole 1021, the second step hole 1022 and the third step hole 1023 decrease in sequence and are interconnected. The third step hole 1023 is connected to the built-in groove 101. The inner wall of the first step hole 1021 is provided with an internal thread, and the outer wall of the optical fiber connector 5 is provided with an external thread. The optical fiber connector 5 is installed in the first step hole 1021 through the external thread and the internal thread, and the lens 7 is installed in the second step hole 1022. The first step hole 1021 is the mounting position of the optical fiber connector 5, the second step hole 1022 is the mounting position of the lens 7, and the third step hole 1023 is used as a hole for passing the excitation light and the feedback light, so as to facilitate the assembly of the lens 7 and the optical fiber connector 5 with the device housing 1.

[0032] In this embodiment, if Figure 2 and Figure 3 As shown, a rubber ring 6 is installed between the optical fiber connector 5 and the lens 7 . The rubber ring 6 is made of soft rubber material and mainly plays the role of fixing the lens 7 and protecting the lens 7 from wear and tear of the optical fiber connector 5 .

[0033] In this embodiment, it should be noted that by pre-welding the photodetector 9 and the light-emitting diode 10 in parallel on the circuit board 8, an excitation light source can be provided for the device and the feedback light signal can be converted into an electrical signal. In addition, the photodetector 9 with a focusing lens can refract the feedback point light into a columnar light, thereby increasing the feedback light receiving area, reducing the use of the feedback light collecting lens 7, and reducing the assembly parts and steps of the device. This design simplifies the structure of the device and improves the collection efficiency of the photoelectric signal, providing an effective solution for improving the system performance and simplifying the device manufacturing.

[0034] The reflector 4 is an optical element used to change the propagation direction of light. Its main function is to reflect the light from the light emitting diode 10 to the corresponding lens 7, thereby transmitting the excitation light source to the outside.

[0035] The dichroic mirror 3 is a semi-reflective and semi-transmissive plane mirror, which has the characteristics of high reflectivity for light of a specific wavelength and high transmittance for light of other wavelengths. Its main function is to transmit the light of the light emitting diode 10 to the corresponding lens 7 and reflect the feedback light source transmitted back from the lens 7 to the corresponding photodetector 9;

[0036] The optical fiber connector 5 transmits the excitation light in the channel optical path to the external optical fiber, and transmits the feedback light returned by the external optical fiber to the lens 7. The type of the optical fiber connector 5 can be selected according to the needs;

[0037] Lens 7 is a double-sided lens, which converges the excitation light emitted by the device and transmits it to the optical fiber connector 5 and the external optical fiber. At the same time, lens 7 also converges the fluorescence transmitted back by the external optical fiber through the optical fiber connector 5, and transmits it to the photodetector 9 through the dichroic mirror 3, completing the collection and transmission of the optical signal.

[0038] Working principle: When working, the circuit board 8 first controls the light-emitting diode 10 to emit light as the excitation light, which is reflected by the multi-channel shared reflector 4 and transmitted by the dichroic mirror 3. After being focused by the lens 7, the converged light beam is transmitted to the optical fiber connector 5. The optical fiber connector 5 is connected to an external optical fiber to transmit the excitation light emitted by the device to the position of the fluorescent material to excite the fluorescent material to emit light. After the excitation light source stops emitting, the fluorescent material continues to emit light. The external optical fiber transmits the fluorescence emitted by the fluorescent material back to the optical fiber connector 5 as feedback light. The feedback light returned by the optical fiber connector 5 is focused by the lens 7, reflected by the dichroic mirror 3, and sent to the corresponding photodetector. 9 processing, the utility model ensures that the transmission and reflection angles of the light transmission route are consistent through multiple channel optical paths, and improves the consistency of photoelectric information processed by each channel optical path. By embedding a circuit board 8 with a photodetector 9 and a light-emitting diode 10 inside the device housing 1, sharing a circuit board 8, and on the same plane, the circuit structure is integrated, the integration is high, and the assembly is convenient, the integration and convenience are improved, and it is suitable for mass production. The device housing 1 is integrally formed by die-casting. The processing technology combining die-casting and fine machining reduces the production cost and enhances product consistency.

[0039] The above embodiments are preferred implementation schemes of the present invention. In addition, the present invention can also be implemented in other ways. Any obvious replacement without departing from the concept of the present technical solution is within the protection scope of the present invention.

Claims

1. A multi-channel combined optical path structure, characterized in that: The device comprises a housing (1), wherein a built-in groove (101) is arranged inside the housing (1), an upper cover (2) is fixedly connected to the top of the built-in groove (101) of the housing (1), a dichroic mirror (3) is installed on the inclined surface of the built-in groove (101), a reflector (4) is installed on the inner wall inclined surface of the upper cover (2), a plurality of mounting holes (102) communicating with the built-in groove (101) are opened on one side of the housing (1), an optical fiber connector (5) and a lens (7) are installed in each mounting hole (102), and the bottom of the housing (1) is opened. A mounting groove is provided, a circuit board (8) is installed in the mounting groove, a plurality of photodetectors (9) and light-emitting diodes (10) are arranged on the circuit board (8), a first through hole for installing the photodetector (9) and a second through hole for installing the light-emitting diode (10) are provided on the device housing (1), the first through hole and the second through hole pass through the mounting groove and the built-in groove (101), wherein a group of the optical fiber connector (5), the lens (7), the photodetector (9), the light-emitting diode (10), the dichroic mirror (3), and the reflector (4) form a channel light path.

2. A multi-channel combined optical path structure according to claim 1, characterized in that: The photodetector (9) and the light emitting diode (10) are pre-soldered on the circuit board (8).

3. The multi-channel combined optical path structure according to claim 1, characterized in that: The circuit board (8) is fixedly installed in the installation groove by means of screws, and a bottom cover (11) is clamped in the installation groove and located at the bottom of the circuit board (8).

4. The multi-channel combined optical path structure according to claim 1, characterized in that: The mounting hole (102) comprises a first step hole (1021), a second step hole (1022) and a third step hole (1023) which are arranged in sequence along the direction from the optical fiber connector (5) to the dichroic mirror (3); the diameters of the first step hole (1021), the second step hole (1022) and the third step hole (1023) decrease in sequence and are interconnected; the third step hole (1023) is connected to the built-in groove (101); the inner wall of the first step hole (1021) is provided with an internal thread; the outer wall of the optical fiber connector (5) is provided with an external thread; the optical fiber connector (5) is installed in the first step hole (1021) via the external thread and the internal thread; and the lens (7) is installed in the second step hole (1022).

5. The multi-channel combined optical path structure according to claim 1, characterized in that: A rubber ring (6) is installed between the optical fiber connector (5) and the lens (7).

6. The multi-channel combined optical path structure according to claim 1, characterized in that: The dichroic mirror (3) and the reflector (4) are arranged in parallel, and the angle between the dichroic mirror (3) and the reflector (4) and the horizontal plane is 45°.

7. The multi-channel combined optical path structure according to claim 6, characterized in that: A first locking groove is provided on the inclined surface of the built-in groove (101), and the dichroic mirror (3) is locked in the first locking groove. A second locking groove is provided on the inclined surface of the inner wall of the upper cover (2), and the reflecting mirror (4) is locked in the second locking groove.

8. The multi-channel combined optical path structure according to claim 1, characterized in that: The device housing (1) is integrally formed by die-casting.

9. The multi-channel combined optical path structure according to claim 1, characterized in that: The photoelectric detector (9) is a photoelectric detector with a focusing lens.

Images