Multi-channel combined optical path structure

Abstract

A multi-channel combined optical path structure, comprising a device housing (1), wherein an internal recess (101) is provided inside the device housing (1); an upper cover (2) is fixedly connected to the top of the internal recess (101) of the device housing (1); a dichroic mirror (3) is mounted on an inclined surface of the internal recess (101); a reflecting mirror (4) is mounted on an inclined surface of the inner wall of the upper cover (2); a plurality of mounting holes (102) in communication with the internal recess (101) are provided in one side of the device housing (1); a fiber optic connector (5) and a lens (7) are mounted in each mounting hole (102); a mounting recess is provided in the bottom of the device housing (1); a circuit board (8) is mounted in the mounting recess; and a plurality of photodetectors (9) and light-emitting diodes (10) are provided on the circuit board (8). The multi-channel combined optical path structure can improve the consistency of photoelectric information processing across channel optical paths and improve the integration level and convenience, reduces production costs by means of processing technology combining die casting with precision machining, enhances the product consistency, and is suitable for mass production.

Description

Multi-channel combined optical path structure TECHNICAL FIELD

[0001] The utility model relates to fluorescent optical fiber temperature measurement technical field, specifically to a kind of multi-channel combined optical path structure. BACKGROUND

[0002] In recent years, fluorescent optical fiber temperature sensing technology is concerned due to its high reliability, compact design, high precision, strong anti-interference and long life and other advantages.In the face of complex environmental conditions, such as multiple electromagnetic interference, high voltage, high temperature and strong corrosion, etc., the traditional electrical temperature sensing technology shows limitations, so the fluorescent optical fiber temperature sensing technology becomes a more reliable and applicable choice.For example, its application in power equipment hotspot monitoring, microwave industry, radio frequency hyperthermia, MRI and plasma experiment, etc.has been widely recognized.With the continuous development of the technology, related equipment is continuously improved and optimized to meet the growing application needs, especially in the sensing system.

[0003] In the current fluorescent optical fiber temperature sensing system, the fluorescent temperature demodulator is crucial, and the optical path structure inside it is a key component.The temperature demodulator on the market usually uses a single-channel optical path device, and multiple single-channel optical paths are combined into a multi-channel demodulator.The typical optical path design includes using a light-emitting diode as an excitation light source, focusing the light through a filter and a lens to an access optical fiber, transmitting it to the fluorescent material position, and then feeding back the fluorescent feedback light to the demodulator, and then demodulating the temperature data through a photodetector.Although the single-channel optical path composite device has the advantages of independent temperature measurement and no mutual interference, its assembly is complex, the test is tedious, the transmission path difference between the optical path devices leads to inconsistent optical information transmission accuracy, and each single-channel optical path composite device needs to be connected to the demodulator and the optical fiber through an independent interface, and loose interface may cause signal interruption.

[0004] Therefore, it is urgent to design a multi-channel optical path composite device to improve the accuracy and stability of the optical path composite device, simplify the assembly process, and optimize the interface design to improve the overall performance and reliability of the system. INVENTION CONTENTS

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

[0006] In view of the deficiencies of the prior art, the purpose of the utility model is to provide a multi-channel combined optical path structure to improve the consistency of optical and electrical information processing of each channel, improve the integration and convenience, reduce the production cost through the combination of die casting and finishing machining, enhance the product consistency, and be suitable for mass production.

[0007] 2. Technical scheme

[0008] To achieve the above object, the utility model provides the following technical scheme:

[0009] A multi-channel combined light path structure, including device casing, the built -in recess is arranged in the device casing, the built -in recess top of device casing is fixedly connected with upper cover, the bevel of built -in recess is installed with dichroic mirror, the inner wall bevel of upper cover is installed with reflector, device casing one side is provided with a plurality of with built -in recess communicates mounting hole, every mounting hole all is installed with optical fiber connector and lens, the bottom of device casing is provided with mounting recess, the circuit board is installed in mounting recess, a plurality of photoelectric detector and light emitting diode are arranged on the circuit board, the first through -hole for photoelectric detector is set up on the device casing and the second through -hole for light emitting diode is set up, the first through -hole and second through -hole pass through mounting recess and built -in recess, wherein, a group of optical fiber connector, lens, photoelectric detector, light emitting diode and dichroic mirror, reflector form a channel light path.

[0010] Preferably, the photoelectric detector and the light emitting diode are pre-welded on the circuit board.

[0011] Preferably, the circuit board is fixedly installed in the mounting recess by screws, and a bottom cover is clamped to the bottom of the circuit board in the mounting recess.

[0012] Preferably, the mounting hole includes a first stepped hole, a second stepped hole and a third stepped hole arranged in sequence from the optical fiber connector to the dichroic mirror, the diameters of the first, second and third stepped holes decrease in sequence and are in communication with each other, the third stepped hole is in communication with the built-in recess, the inner wall of the first stepped hole is provided with internal threads, the outer wall of the optical fiber connector is provided with external threads, the optical fiber connector is installed in the first stepped hole through the external threads and the internal threads, and the lens is installed in the second stepped 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 included angle between the dichroic mirror, the reflector and the horizontal plane is 45°.

[0015] Preferably, a first clamping groove is formed on the bevel of the built-in recess, the dichroic mirror is clamped in the first clamping groove, a second clamping groove is formed on the bevel of the inner wall of the upper cover, and the reflector is clamped in the second clamping groove.

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

[0017] Preferably, the photoelectric detector is a photoelectric detector with a condenser lens.

[0018] 3. Beneficial effects

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

[0020] The utility model discloses a plurality of channel light path share one dichroic mirror and a reflector, ensure that the transmission and reflection angle of light transmission route are consistent, improve the consistency of each channel light path processing photoelectric information, and the interchangeability of external optical fiber is good, and installation is more simple and convenient.

[0021] The utility model discloses a plurality of channel light path share one dichroic mirror and a reflector, ensure that the transmission and reflection angle of light transmission route are consistent, improve the consistency of each channel light path processing photoelectric information, and the interchangeability of external optical fiber is good, and installation is more simple and convenient. BRIEF DESCRIPTION OF DRAWINGS

[0022] Fig. 1 is a whole three-dimensional structure schematic diagram of multi-channel combined light path structure;

[0023] Fig. 2 is the split structure schematic diagram of multi-channel combined light path structure;

[0024] Fig. 3 is the internal structure schematic diagram of multi-channel combined light path structure.

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

[0026] The technical scheme in the embodiments of the utility model will be described clearly and completely below in conjunction with the drawings of the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0027] Embodiment:

[0028] Please refer to Figures 1-3, the embodiment provides a kind of multi-channel combined light path structure, including device shell 1, the built-in recess 101 is provided in device shell 1, the built-in recess 101 top of device shell 1 is fixedly connected with upper cover 2, upper cover 2 is fixedly installed on device shell 1 by screw, dichroic mirror 3 is installed on the inclined surface of built-in recess 101, the inner wall inclined surface of upper cover 2 is installed with reflecting mirror 4, device shell 1 side is provided with multiple installation holes 102 with built-in recess 101, fiber optic connector 5 and lens 7 are installed in each installation hole 102, the installation recess is set in the bottom of device shell 1, and circuit board 8 is installed in the installation recess, and multiple photoelectric detectors 9 and light emitting diodes 10 are provided on circuit board 8, first through hole for photoelectric detector 9 is set in device shell 1 and second through hole for light emitting diode 10, first through hole and second through hole pass through installation recess and built-in recess 101, wherein, fiber optic connector 5, lens 7, photoelectric detector 9 and light emitting diode 10 are same in quantity and one-to-one correspondence, a group of fiber optic connector 5, lens 7, photoelectric detector 9, light emitting diode 10 and dichroic mirror 3, reflecting mirror 4 form a channel light path, the number of channel light path can be designed according to actual demand, realize more light channel combination, the realization principle of channel light path is that the excitation light generated by light emitting diode 10 is reflected by reflecting mirror 4 and transmitted by dichroic mirror 3, and focused by lens 7, and is transmitted to fiber optic connector 5 and external optical fiber, the feedback light of fiber optic connector 5 and external optical fiber is focused by lens 7 and reflected by dichroic mirror 3, and is sent to corresponding photoelectric detector 9 for processing, multiple channel light paths share a dichroic mirror 3 and a reflecting mirror 4, ensure that the transmission and reflection angle of light transmission route is consistent, improve the consistency of photoelectric information processed by each channel light path.

[0029] In the embodiment, as shown in Figures 2 and 3, photoelectric detector 9 and light emitting diode 10 are pre-welded on circuit board 8, circuit board 8 is fixedly installed in installation recess by screw, bottom cover 11 is clamped in installation recess and located at the bottom of circuit board 8, can embed circuit board 8 with photoelectric detector 9 and light emitting diode 10 in the inside of device shell 1, share a circuit board 8, and on the same plane, the circuit structure is integrated, integrated high, convenient to assemble, improve integration and convenience, suitable for mass production, it needs to be explained that data interface is provided on circuit board 8, as external data connection interface.

[0030] In the embodiment, as shown in FIG. 3, the first clamping groove is arranged on the inclined surface of the built-in groove 101, the dichroic mirror 3 is clamped in the first clamping groove, the second clamping groove is arranged on the inner wall inclined surface of the upper cover 2, and the reflecting mirror 4 is clamped in the second clamping groove. It should be noted that the installation angle of the dichroic mirror 3 and the reflecting mirror 4 is to ensure the angle of the excitation light reflected by the reflecting mirror 4 and the dichroic mirror 3. Preferably, the dichroic mirror 3 and the reflecting mirror 4 are arranged in parallel, and the angle between the dichroic mirror 3 and the reflecting mirror 4 and the horizontal plane is 45°. The dichroic mirror 3 and the reflecting mirror 4 are used for positioning and assembling. The device housing 1 is integrally formed by die casting. The device housing 1 is designed as an irregular trapezoidal structure with a hollow bottom and an inclined side. It has a bottom opening and an inclined surface opening. The structure is unified, which can be mass-produced, reduce costs, and is convenient for production. The combination of die casting and finishing reduces production costs and enhances product consistency.

[0031] In the embodiment, as shown in FIG. 2 and FIG. 3, the mounting hole 102 includes a first stepped hole 1021, a second stepped hole 1022 and a third stepped hole 1023 arranged in sequence from the optical fiber connector 5 to the dichroic mirror 3. The first stepped hole 1021, the second stepped hole 1022 and the third stepped hole 1023 are in communication with each other in sequence. The third stepped hole 1023 is in communication with the built-in groove 101. The inner wall of the first stepped 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 stepped hole 1021 through the external thread and the internal thread. The lens 7 is installed in the second stepped hole 1022. The first stepped hole 1021 is the installation position of the optical fiber connector 5, the second stepped hole 1022 is the installation position of the lens 7, and the third stepped hole 1023 serves as a hole for the excitation light and the feedback light to pass through, which facilitates the assembly of the lens 7, the optical fiber connector 5 and the device housing 1.

[0032] In the embodiment, as shown in FIG. 2 and FIG. 3, 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, mainly plays a role in fixing the lens 7, and protects the lens 7 from being worn by the optical fiber connector 5.

[0033] In the embodiment, it should be noted that the photoelectric detector 9 and the light-emitting diode 10 are pre-welded on the circuit board 8 in a parallel form, which can provide an excitation light source for the device and convert the feedback light signal into an electrical signal. In addition, the photoelectric detector 9 with a condenser can refract the feedback point light into columnar light, thereby increasing the feedback light receiving area, reducing the use of the feedback light collecting lens 7, and reducing the assembly components and steps of the device. This design not only simplifies the structure of the device, but also improves the collection efficiency of the photoelectric signal, which provides an effective solution for improving the system performance and simplifying the device manufacturing.

[0034] The mirror 4 is used as an optical element for changing the propagation direction of light, and mainly functions to reflect the light of the light emitting diode 10 to the corresponding lens 7, so as to transmit the excitation light source to the outside;

[0035] The dichroic mirror 3 is used as a half-reflecting and half-transmitting mirror, and has the characteristics of high reflectivity to light of a specific wavelength and high transmissivity to light of other wavelengths, and mainly functions 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 fiber connector 5 transmits the excitation light in the channel optical path to the external optical fiber and transmits the feedback light transmitted back from the external optical fiber to the lens 7, and the fiber connector 5 can be selected according to requirements;

[0037] The lens 7 is a double-sided lens, which converges and transmits the excitation light emitted by the device to the fiber connector 5 and the external optical fiber, and at the same time, converges the fluorescent light transmitted back from the external optical fiber through the fiber connector 5, transmits the fluorescent light to the photodetector 9 through the dichroic mirror 3, and completes the collection and transmission of the optical signal.

[0038] Working principle: in work, first, the light emitting diode 10 is controlled by the circuit board 8 to emit light as excitation light, which is reflected by the commonly used mirror 4 and transmitted by the dichroic mirror 3, and then focused by the lens 7, and the converged light beam is transmitted to the fiber connector 5, and the excitation light emitted by the device is transmitted to the position of the fluorescent material through the external optical fiber of the fiber connector 5, so that the fluorescent material emits light, and after the excitation light source stops emitting, the fluorescent material continues to emit light, and the external optical fiber transmits the fluorescent light emitted by the fluorescent material as feedback light back to the fiber connector 5, the feedback light transmitted back by the fiber connector 5 is focused by the lens 7, transmitted through the dichroic mirror 3, and sent to the corresponding photodetector 9 for processing, the utility model discloses a plurality of channel optical paths share a dichroic mirror 3 and a mirror 4, ensure that the transmission and reflection angles of the light transmission route are consistent, improve the consistency of the processing of the photoelectric information of each channel optical path, embed the circuit board 8 with the photodetector 9 and the light emitting diode 10 in the device housing 1, share a circuit board 8, and are on the same plane, the circuit structure is integrated, integrated, convenient to assemble, improve the integration and convenience, suitable for mass production, the device housing 1 is integrally formed by die casting, the production cost is reduced by combining the die casting and finishing machining processes, and the product consistency is enhanced.

[0039] The above embodiment is a preferred implementation scheme of the utility model, in addition to this, the utility model can also be realized in other ways, without departing from the technical scheme concept, any obvious replacement is within the protection scope of the utility model.

Claims

1. A multi-pass combined optical path structure, characterized by: The utility model provides a kind of optical fiber communication device, including device shell (1), the inside of device shell (1) is provided with built-in recess (101), the top of built-in recess (101) of device shell (1) is fixedly connected with upper cover (2), the inclined surface of built-in recess (101) is installed with dichroic mirror (3), the inclined surface of the inner wall of upper cover (2) is installed with reflector (4), device shell (1) one side is provided with multiple installation hole (102) with built-in recess (101) intercommunication, each installation hole (102) is installed with optical fiber connector (5) and lens (7) in, the bottom of device shell (1) is provided with installation recess, and the installation recess is installed with circuit board (8), and the circuit board (8) is provided with multiple photoelectric detector (9) and light emitting diode (10), the first through-hole for photoelectric detector (9) is installed in and the second through-hole for light emitting diode (10) is installed in are set up on device shell (1), and the first through-hole and second through-hole are through installation recess and built-in recess (101), wherein, a group of optical fiber connector (5), lens (7), photoelectric detector (9), light emitting diode (10) and dichroic mirror (3), reflector (4) form a channel optical path.

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

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

4. The multi-pass combined light path structure of claim 1, wherein: The installation hole (102) includes first stepped hole (1021), second stepped hole (1022) and third stepped hole (1023) arranged in sequence from the optical fiber connector (5) to the dichroic mirror (3), the diameters of the first stepped hole (1021), the second stepped hole (1022) and the third stepped hole (1023) decrease in sequence and are in communication with each other, the third stepped hole (1023) is in communication with the built-in recess (101), the inner wall of the first stepped hole (1021) is provided with internal threads, the outer wall of the optical fiber connector (5) is provided with external threads, the optical fiber connector (5) is installed in the first stepped hole (1021) through the external threads and the internal threads, and the lens (7) is installed in the second stepped hole (1022).

5. A multi-pass 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. A multi-pass 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 included angle between the dichroic mirror (3) and the reflector (4) and the horizontal plane is 45°.

7. A multi-pass combined optical path structure according to claim 6, characterized in that: A first clamping groove is formed on the inclined surface of the built-in recess (101), and the dichroic mirror (3) is clamped in the first clamping groove; a second clamping groove is formed on the inclined surface of the inner wall of the upper cover (2), and the reflector (4) is clamped in the second clamping groove.

8. The multi-pass combined light path structure of claim 1, wherein: The device shell (1) is integrally formed by die casting.

9. The multi-pass combined light path structure of claim 1, wherein: The photoelectric detector (9) is a photoelectric detector with a condenser lens.

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