Multi-channel demodulator and monitoring device

Abstract

The utility model provides a multichannel demodulator and monitoring equipment, relates to the sensing monitoring technical field, the multichannel demodulator includes casing body, circuit board, optical filter, a plurality of light source, a plurality of photoelectric detector and a plurality of optical fiber splice, the casing body is provided with a plurality of light path through hole, a plurality of optical fiber splice is correspondingly arranged at one end of the light path through hole, and the optical fiber splice is provided with a plurality of optical path through hole. The optical filter is arranged in the shell body and comprises an optical filtering part, the circuit board is arranged in the shell body, the plurality of light sources are electrically connected to the circuit board and emit detection light to the optical filtering part, and the plurality of photoelectric detectors are correspondingly arranged at one end, far away from the optical fiber connector, of the optical path through hole. Compared with the prior art, the multi-channel multi-point measurement is realized by adopting a plurality of light path through holes, the integration level is high, the number of parts is reduced, the production process is simplified, and the manufacturing cost is reduced; and through the accurate arrangement of the plurality of light path through holes, the high-precision measurement requirement can be ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of sensor monitoring, in particular to a multi-channel demodulator and monitoring equipment. Background Art

[0002] In the development of modern science and technology, optical measurement technology has become an important measurement method and is widely used in various scientific research and industrial production fields. Among them, fluorescent fiber temperature measurement technology is a technology that measures temperature based on the luminescence characteristics of fluorescent substances. Its basic principle is to determine its temperature by measuring the emission spectrum of fluorescent substances. The demodulator is a device used to demodulate optical signals. It can obtain the required information by analyzing and processing optical signals.

[0003] In the existing technology, a typical solution is to use a single-channel demodulator, transmit the optical signal through an optical fiber to one end of the measured optical fiber through an emitting light source, and then use the phosphor to reflect part of the optical signal back, and receive the optical signal of a specific band through an amplifier and a filter, and finally detect the temperature of the optical fiber end by demodulating the optical signal. The advantage of this method is that it can realize the temperature measurement of a single temperature point, with high measurement accuracy and stability.

[0004] However, the demodulator in the related art is usually a single-channel demodulator, and there are still some problems in practical applications. First, the application that requires temperature detection is not a single point, but multiple points, or dozens or even more points of multiple devices. It is obviously not enough to rely on a single demodulation module for measurement; secondly, the use of multiple single-channel demodulators to assemble a multi-channel demodulator has problems such as high manufacturing cost and complex production process. Utility Model Content

[0005] The utility model aims to provide a multi-channel demodulator and monitoring equipment, which can realize multi-channel multi-point measurement, reduce manufacturing costs and simplify the production process.

[0006] The embodiment of the utility model is achieved as follows:

[0007] In a first aspect, the utility model provides a multi-channel demodulator, comprising:

[0008] The shell body is provided with a plurality of light path through holes;

[0009] A circuit board is arranged on the shell body;

[0010] A filter, disposed on the shell body, the filter comprising a filter portion extending along the radial direction of the optical path through hole and penetrating the optical path through hole;

[0011] A plurality of light sources are electrically connected to the circuit board, each of the light sources extends into the shell body and emits detection light one by one to the filter part located at each of the light path through holes;

[0012] A plurality of optical fiber connectors, each of which is arranged one-to-one at one end of each of the optical path through holes and is used to connect the sensing optical fiber;

[0013] A plurality of photoelectric detectors are electrically connected to the circuit board, and each of the photoelectric detectors is arranged one-to-one at one end of each of the optical path through holes away from the optical fiber connector.

[0014] In an optional embodiment, a plurality of the light path through holes share one filter, and the filter passes through the corresponding light path through holes along the radial direction of the light path through holes respectively, and forms the filter parts corresponding to the corresponding light sources one by one.

[0015] In an optional embodiment, the shell body is provided with an inclined mounting hole that penetrates the plurality of optical path through holes along a first direction, the optical filter is plugged into the inclined mounting hole, and the first direction extends radially along the optical path through holes.

[0016] In an optional embodiment, the width of the filter along the second direction is substantially equal to the width of the inclined mounting hole along the second direction, and the second direction is perpendicular to the first direction.

[0017] In an optional embodiment, the oblique mounting hole comprises:

[0018] Give way to the hole segment;

[0019] Two fixed slot hole sections, the two fixed slot hole sections are located one-to-one at the two ends of the clearance hole section along the second direction, the gap width of the fixed slot hole section is substantially equal to the thickness of the filter, and the gap width of the clearance hole section is greater than the thickness of the filter, so that the filter is spaced apart from the side wall of the clearance hole section.

[0020] In an optional embodiment, the two ends of the inclined mounting hole along the first direction penetrate to the two opposite side walls of the shell body, and the two ends of the filter along the first direction are flush with the two opposite side walls of the shell body; and / or, the two ends of the filter along the first direction are coated with an adhesive layer, and the adhesive layer seals the inclined mounting hole so that the filter is glued to the inclined mounting hole.

[0021] In an optional embodiment, in the radial direction of the optical path through hole, a plurality of the optical path through holes are arranged in a row and opened in the shell body;

[0022] Among them, the shell body also begins to open a plurality of light-transmitting holes that connect the lower side of the shell body with each of the optical path through holes one-to-one. The lower side of the shell body refers to one side of the shell body in a third direction, and the third direction is a direction perpendicular to the plane where the plurality of optical path through holes are arranged in a row.

[0023] In an optional embodiment, a receiving groove connected to the light-transmitting hole is further provided on the bottom side of the light-transmitting hole, the circuit board is arranged on the lower side of the shell body, and each of the light sources is received in each of the receiving grooves one by one.

[0024] In an optional embodiment, a buffer sleeve is further provided in the receiving groove, and the buffer sleeve is arranged around the light source; and / or,

[0025] The multi-channel demodulator further includes a transfer board, the photodetector is integrated in the transfer board, the transfer board is electrically connected to the circuit board, and the transfer board is arranged facing the optical path through hole; and / or,

[0026] The shell body is a CNC machined one-piece structure; and / or,

[0027] The multi-channel demodulator is a fluorescent optical fiber temperature measurement demodulator.

[0028] On the other hand, the utility model provides a monitoring device, including a sensing optical fiber and the aforementioned multi-channel demodulator, wherein the sensing optical fiber is connected to the optical fiber connector, and the multi-channel demodulator is configured to perform environmental sensing through the sensing optical fiber, wherein the environmental sensing includes one of temperature sensing and gas concentration sensing.

[0029] The beneficial effects of the embodiments of the utility model include:

[0030] The multi-channel demodulator and monitoring device provided by the embodiment of the utility model have multiple optical path through holes arranged in the shell body, the circuit board is arranged in the shell body, and the filter is arranged in the shell body, the filter includes a filter part extending along the radial direction of the optical path through hole and penetrating the optical path through hole, multiple light sources are electrically connected to the circuit board, each light source extends into the shell body and emits detection light to the filter part located in each optical path through hole one by one, multiple optical fiber connectors are arranged one by one at one end of each optical path through hole and are used to connect sensing optical fibers, multiple photoelectric detectors are electrically connected to the circuit board, and each photoelectric detector is arranged one by one at one end of each optical path through hole away from the optical fiber connector. Compared with the related art, the utility model realizes multi-channel and multi-point measurement by opening multiple optical path through holes on a shell body, replacing the design structure of assembling a multi-channel demodulator using multiple single-channel demodulators, with high integration, reduced number of components, and conducive to simplifying the production process and reducing manufacturing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 A schematic diagram of the external structure of a multi-channel demodulator provided by an embodiment of the utility model;

[0033] Figure 2 A cross-sectional view of the internal structure of a multi-channel demodulator provided by an embodiment of the utility model;

[0034] Figure 3 for Figure 2 A partial enlarged schematic diagram of middle III;

[0035] Figure 4 A schematic diagram of the exploded structure of a multi-channel demodulator provided by an embodiment of the utility model;

[0036] Figure 5 for Figure 4 Schematic diagram of the structure of the middle shell body;

[0037] Figure 6 for Figure 4 A cross-sectional view of the middle shell body;

[0038] Figure 7 for Figure 6 A partial enlarged schematic diagram of section VII.

[0039] icon:

[0040] 100-multi-channel demodulator; 110-shell body; 111-optical path through hole; 112-mounting inclined hole; 113-clearance hole section; 114-fixed slot hole section; 115-stop step; 120-circuit board; 130-filter; 140-light source; 141-light-transmitting hole; 142-accommodating groove; 143-buffer sleeve; 150-photoelectric detector; 160-optical fiber connector; 161-plug-in female head; 1611-optical fiber ferrule; 162-plug-in male head; 170-packaging sheet; 180-connector pressure plate; 181-mounting matching hole; 190-lens. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme 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 part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0042] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0044] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0045] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0046] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] As disclosed in the background technology, the demodulator in the related art is usually a single-channel demodulator, and there are still some problems in practical applications. First, the application that requires temperature detection is not a single point, but multiple points, or dozens or even more points of multiple devices. It is obvious that the application range is not enough to measure only by a single demodulation module; secondly, the use of multiple single-channel demodulators directly assembled into a multi-channel demodulator has problems such as high manufacturing cost and complex production process.

[0048] In order to solve the above problems, the embodiment of the utility model provides a novel multi-channel demodulator, and the specific structure and principle of the multi-channel demodulator are described in detail below.

[0049] Please refer to Figure 1 and Figure 2 The multi-channel demodulator 100 provided in this embodiment includes a shell body 110, a circuit board 120, a filter 130, a plurality of light sources 140, a plurality of photodetectors 150 and a plurality of optical fiber connectors 160. A plurality of optical path through holes 111 are arranged in the shell body 110. The circuit board 120 is arranged in the shell body 110. The filter 130 is arranged in the shell body 110. The filter 130 includes a filtering portion extending radially along the optical path through hole 111 and penetrating the optical path through hole 111. A plurality of light sources 140 are electrically connected to the circuit board 120, each light source 140 extends into the shell body 110 and emits detection light to the filter part located in each optical path through hole 111 one by one; each optical fiber connector 160 is one by one arranged at one end of each optical path through hole 111 and is used to connect the sensing optical fiber; a plurality of photodetectors 150 are electrically connected to the circuit board 120, each photodetector 150 is one by one arranged at one end of each optical path through hole 111 away from the optical fiber connector 160. The multi-channel demodulator 100 provided in this embodiment can improve the measurement range, realize multi-channel multi-point measurement, and at the same time can ensure high-precision measurement requirements, reduce the test cost, replace the design structure of assembling a multi-channel demodulator using multiple single-channel demodulators, have high integration, reduce the number of components, and help simplify the production process and reduce the manufacturing cost.

[0050] Specifically, refer to Figure 1-Figure 7 , multiple light sources 140 are arranged in parallel on the circuit board 120 and extend into the shell body 110 accordingly; the filter 130 is arranged in the shell body 110 and extends through multiple optical path holes 111 at an angle, and the angle of the filter 130 is determined according to the existing optical path design requirements, and the details are not repeated. The filter 130 corresponds to the multiple light sources 140, and the multiple photodetectors 150 are correspondingly arranged at one end of the multiple optical path holes 111 away from the optical fiber connector 160.

[0051] In some embodiments, two or more filters 130 may be used to meet the requirements. Figures 2 to 7 A plurality of optical path through holes 111 share one optical filter 130, and the optical filter 130 respectively penetrates the corresponding optical path through holes 111 along the radial direction of the optical path through holes 111, and forms a filtering part corresponding to the corresponding light source 140 one by one. A plurality of optical path through holes 111 share one optical filter 130, which can reduce the number of parts, reduce the assembly process, and simplify the process.

[0052] In some embodiments, see Figures 2 to 7 The shell body 110 is provided with an oblique installation hole 112 that simultaneously penetrates through the plurality of optical path through holes 111 along a first direction. The optical filter 130 is inserted into the oblique installation hole 112 along the first direction and is located between the light source 140 and the photodetector 150, wherein the first direction extends along the radial direction of the optical path through holes 111. Specifically, the oblique installation hole 112 is provided on the side wall of the shell body 110, so that the optical filter 130 can be directly inserted into the shell body 110 from the outside of the shell body 110, and then penetrates through the plurality of optical path through holes 111, and the oblique installation hole 112 is an inclined structure, which ensures the inclined installation of the optical filter 130.

[0053] In some embodiments, see Figures 2 to 7 The width of the filter 130 along the second direction is substantially equal to the width of the installation oblique hole 112 along the second direction, wherein the second direction is perpendicular to the first direction. The term “substantially equal” means that the filter 130 is adapted to the installation oblique hole 112 .

[0054] In some embodiments, see Figures 2 to 7 The mounting inclined hole 112 includes a clearance hole section 113 and two fixed slot hole sections 114, and the two fixed slot hole sections 114 are located at both ends of the clearance hole section 113 along the second direction, the gap width of the fixed slot hole section 114 is substantially equal to the thickness of the filter 130, and the gap width of the clearance hole section 113 is greater than the thickness of the filter 130, so that the filter 130 is spaced apart from the side wall of the clearance hole section 113. Specifically, the installation inclined hole 112 presents a structural feature of being wide in the middle and narrow at both ends in the second direction, the wider part in the middle is configured as a clearance hole section 113, and the narrower parts at both ends are configured as fixed slot hole sections 114, wherein the gap width of the fixed slot hole section 114 is substantially equal to the thickness of the filter 130, so that the two ends of the filter 130 along the short side direction can be embedded in the fixed slot hole section 114, and the gap width of the clearance hole section 113 is relatively large and greater than the thickness of the filter 130, so that the effective area of ​​the filter 130 will not contact the two side edges of the installation inclined hole 112 during the installation process to cause scratches, thereby effectively protecting the filter 130. It should be noted that substantially equal is an explanation of the processing tolerance.

[0055] In some embodiments, see Figures 2 to 7The two ends of the installation inclined hole 112 along the first direction penetrate the two opposite side walls of the shell body 110 to form a through hole. This design structure can enable the debris generated by cutting to be quickly discharged from the shell body 110 from both ends of the installation inclined hole 112 when processing the installation inclined hole 112.

[0056] In addition, see Figures 2 to 7 In some embodiments, after the installation inclined hole 112 is opened on the shell body 110, the filter 130 is installed. After installation, no additional protective structure is usually provided, which causes external dust and impurities to easily enter the interior through the installation inclined hole 112, affecting the transparency of the optical path and the cleanliness of the filter 130; in addition, the fixing effect of the filter 130 is poor and it is easy to loosen and affect its filtering effect.

[0057] In some embodiments, a packaging sheet 170 is further provided on two opposite side walls of the shell body 110. The packaging sheet 170 can be fixed to the shell body 110 by an adhesive layer. At the same time, the packaging sheet 170 covers the installation inclined hole 112. On the one hand, it can provide good protection for the filter 130 and prevent external dust or impurities from entering the shell body 110, thereby ensuring the transparency of the optical path and the cleanliness of the filter 130. On the other hand, it can stop the filter 130 and prevent the filter 130 from slipping out of the installation inclined hole 112 and affecting the filtering effect. In addition, in some embodiments, see Figures 2 to 7 Slots for inserting the packaging sheet 170 can be opened on the two opposite side walls of the shell body 110, and assembly can be achieved directly by plugging in, ensuring that the packaging sheet 170 is tightly plugged into the slot. The structure is simple, the assembly is convenient and reliable.

[0058] In addition, see Figures 2 to 7 , the two ends of the filter 130 along the first direction are flush with the two opposite side walls of the shell body 110, and the width of the filter 130 along the second direction is substantially equal to the width of the installation inclined hole 112, wherein the second direction is perpendicular to the first direction. Among them, the filter 130 can be in the shape of a rectangular sheet, the first direction refers to the long side direction of the filter 130, and the second direction refers to the short side direction of the filter 130. In the long side direction, the length of the filter 130 is the same as the length of the installation inclined hole 112, thereby ensuring that the filter 130 will not protrude from the shell body 110 after being installed in place, and facilitating the subsequent installation of the packaging sheet 170. In the short side direction, the width of the filter 130 is the same as the width of the installation inclined hole 112, thereby ensuring that the filter 130 can be exactly installed in the installation inclined hole 112 to avoid displacement during use.

[0059] In some embodiments, both ends of the filter 130 along the first direction are coated with adhesive layers (not numbered in the figure), and the adhesive layers seal the installation inclined hole 112 so that the filter 130 is glued in the installation inclined hole 112. By sealing the installation inclined hole 112 with an adhesive layer, on the one hand, the filter 130 can be fixed, and the filter 130 can be stopped to prevent the filter 130 from falling out of the installation inclined hole 112 and affecting the filtering effect. On the other hand, it can prevent external dust or impurities from entering the shell body 110, ensuring the transparency of the light path and the cleanliness of the filter 130. Of course, in some other embodiments, both ends of the filter 130 can also be directly installed without coating an adhesive layer.

[0060] More specifically, in some embodiments, see Figures 2 to 7 In the radial direction of the light path through hole 111, a plurality of light path through holes 111 are arranged in a row on the shell body 110; wherein, the shell body 110 also begins to open a plurality of light-transmitting holes 141 which respectively connect the lower side of the shell body 110 with each light path through hole 111 one-to-one, and the bottom side of the light-transmitting hole 141 is also opened with a receiving groove 142 which connects the light-transmitting hole 141, the circuit board 120 is arranged on the lower side of the shell body 110, and each light source 140 is accommodated in each accommodating groove 142 one-to-one.

[0061] See also Figures 2 to 7 A buffer sleeve 143 is also disposed in the receiving groove 142 . The buffer sleeve 143 surrounds the light source 140 and abuts against the inner wall of the receiving groove 142 . The buffer sleeve 143 protects the light source 140 and fixes its position.

[0062] See also Figures 2 to 7 In some embodiments, the multi-channel demodulator 100 further includes a transfer board (not numbered in the figure), the photodetector 150 is integrated in the transfer board, the transfer board is electrically connected to the circuit board 120, and the transfer board is arranged facing the optical path through hole 111, and the overall structure is compact. In other preferred embodiments, the photodetector 150 can also be directly installed in the optical path through hole 111 and directly electrically connected to the circuit board 120.

[0063] In some embodiments, see Figures 2 to 7The circuit board 120 is arranged on the lower side of a plurality of optical path through holes 111. Each optical path through hole 111 is provided with a light-transmitting hole 141 corresponding to the filter 130. A receiving groove 142 is also formed on the bottom side of the light-transmitting hole 141. The receiving groove 142 is arranged concentrically with the light-transmitting hole 141. The light source 140 is correspondingly accommodated in the receiving groove 142 and partially extends into the light-transmitting hole 141. A buffer sleeve 143 is also arranged in the receiving groove 142. The buffer sleeve 143 is arranged around the light source 140 and abuts against the inner side wall of the receiving groove 142. Specifically, the light source 140 here can be an LED lamp bead. By providing the receiving groove 142, the light source 140 can be positioned and accommodated, and the light source 140 can be quickly positioned and installed into the receiving groove 142 during assembly. The provision of the buffer sleeve 143 ensures the safe assembly of the light source 140 , avoids collision or scratches between the light source 140 and the inner wall of the light-transmitting hole 141 or the receiving groove 142 , and also plays a certain positioning role.

[0064] In addition, in some embodiments, the shell body 110 is a CNC machined integrally formed structure, and the optical path through hole 111 of the CNC machined integrally formed shell body 110 has high precision. After the shell body 110 is clamped once by a fixture, each optical path through hole 111 and other holes and grooves can be processed separately, without repeatedly loading and unloading to adjust the clamping position of the shell body 110, which is conducive to improving the overall processing accuracy and reducing the processing steps. In some embodiments, the multi-channel demodulator 100 is a fluorescent fiber temperature measurement demodulator, which realizes temperature sensing monitoring through the existing fluorescent fiber temperature measurement principle, and the specific details are not repeated.

[0065] In addition, in conventional technology, the shell body 110 is usually provided with an optical fiber connector 160 at the end, and the measurement is achieved by inserting the sensing optical fiber, and the optical fiber connector 160 and the shell body 110 are usually threaded, so it is necessary to process the internal thread on the inner wall of the optical path through hole 111, and the external thread on the outer peripheral surface of the optical fiber connector 160, which undoubtedly increases the difficulty and cost of production. In addition, since the optical fiber connector 160 needs to have a high degree of alignment when assembling the threads, the installation operation requirements are high, which is not conducive to improving the overall assembly efficiency.

[0066] See also Figures 2 to 5In some embodiments, each optical fiber connector 160 includes a plug-in female connector 161 and a plug-in male connector 162. The plug-in female connector 161 is accommodated at the end of the corresponding optical path through hole 111, and one end of the plug-in female connector 161 extends out of the end face of the shell body 110 to accommodate the optical fiber ferrule 1611. The other end of the plug-in female connector 161 is also provided with a lens 190, and the lens 190 is used to correspond to the optical fiber ferrule 1611. The plug-in male connector 162 is used to be sleeved on the outside of the optical fiber ferrule 1611 and sleeved on the end of the plug-in female connector 161 extending out of the shell body 110. The setting of the lens 190 here can gather the optical signal returned by the optical fiber, so as to better transmit it to the photodetector 150 for reception. The plug-in female connector 161 extends out of the end face of the shell body 110, which is convenient for plugging the optical fiber ferrule 1611. By fixing the outside of the optical fiber ferrule 1611 through the plug-in male connector 162, on the one hand, the external optical fiber structure can be fixed to ensure its precise positioning; on the other hand, through the plug-in cooperation between the plug-in male connector 162 and the plug-in female connector 161, the optical fiber ferrule 1611 can be accurately and reliably inserted into the corresponding position of the plug-in female connector 161, further ensuring the accuracy and reliability of the optical path.

[0067] In some embodiments, see Figures 2 to 7 , a stop step 115 is also provided in each optical path through hole 111, a first gasket (not shown in the figure) is provided on one side of the lens 190, the first gasket is supported on the stop step 115, and a second gasket (not shown in the figure) is provided on the other side of the lens 190, and the plug female 161 is supported on the second gasket. The setting of the lens 190 here can gather the optical signal returned by the optical fiber, so as to better transmit it to the photoelectric detector 150 for reception. The plug female 161 extends out of the end face of the shell body 110, which is convenient for plugging the optical fiber ferrule 1611. In addition, the external part of the optical fiber ferrule 1611 is fixed by the plug male 162. On the one hand, the external optical fiber structure can be fixed to ensure its accurate positioning. On the other hand, by assembling the plug male 162 and the plug female 161, it can ensure that the optical fiber ferrule 1611 is accurately and reliably inserted into the corresponding position of the plug female 161, further ensuring the accuracy and reliability of the optical path.

[0068] In addition, see Figures 2 to 7In this embodiment, the end surface of the shell body 110 is also provided with a joint pressure plate 180, and the joint pressure plate 180 can be fixedly connected with the shell body 110 by means of screws and other mounting parts. A plurality of mounting matching holes 181 are provided on the end surface of the joint pressure plate 180 and / or the shell body 110, and the plurality of mounting matching holes 181 are correspondingly connected to a plurality of optical path channels 111. The shape of the mounting matching hole 181 is substantially equal to the shape of the portion of the plug-in female connector 161 extending out of the shell body 110, and the portion of the plug-in female connector 161 extending out of the shell body 110 is assembled in the mounting matching hole 181. The joint pressure plate 180 is pressed and limited along the axial direction of the optical path channel 111 to limit the plug-in female connector 161, so that the plug-in female connector 161 is fixedly assembled in the optical path channel 111. Specifically, a flange can be convexly provided on the outer periphery of the plug-in female connector 161, and then the joint pressure plate 180 is pressed against the side of the flange facing away from the corresponding photodetector 150 to achieve press-fitting and limiting fixation.

[0069] It should be noted that see Figures 2 to 7 In this embodiment, the installation matching hole 181 can be set on the end face of the shell body 110, and the corresponding connecting hole is opened on the connector pressing plate 180. Alternatively, in other preferred embodiments, the installation matching hole 181 can also be opened on the connector pressing plate 180, or the connector pressing plate 180 and the end face of the shell body 110 are both provided with installation matching holes 181. In this embodiment, by additionally designing a connector pressing plate 180, the connector pressing plate 180 can simultaneously fix multiple optical fiber connectors 160. By adopting the connector pressing plate 180 structure to realize the fixed installation of the optical fiber connector 160, there is no need for the optical fiber connector 160 to be threadedly assembled on the shell body 110, avoiding the additional design of internal and external thread structures, and no need to fix the optical fiber connector 160 by threaded connection, which reduces the manufacturing difficulty and cost, has low installation operation requirements, and greatly improves the assembly efficiency.

[0070] In some embodiments, see Figures 2 to 7 The mounting hole 181 may not be a circular hole, and it may be substantially equal to the female plug connector 161, so that the female plug connector 161 may be fixed in the circumferential direction to prevent the female plug connector 161 from rotating. Preferably, the mounting hole 181 may be a major arc shape to further prevent the female plug connector 161 from rotating in the mounting hole 181.

[0071] In addition, the embodiment of the utility model further provides a monitoring device, which includes a sensing optical fiber and a multi-channel demodulator 100 provided in any of the above embodiments. The sensing optical fiber is connected to the optical fiber connector 160, and the multi-channel demodulator is configured to perform environmental sensing through the sensing optical fiber, and the environmental sensing includes one of temperature sensing and gas concentration sensing. Preferably, the multi-channel demodulator is a fluorescent optical fiber temperature measurement demodulator.

[0072] In some embodiments, the multi-channel demodulator 100 includes a shell body 110, a circuit board 120, a filter 130, multiple light sources 140, multiple photodetectors 150 and multiple optical fiber connectors 160, a plurality of parallel distributed optical path holes 111 are arranged in the shell body 110, the circuit board 120 is arranged in the shell body 110, the filter 130 is arranged in the shell body 110, and the filter 130 includes a filtering portion extending radially along the optical path hole 111 and passing through the optical path hole 111. A plurality of light sources 140 are electrically connected to the circuit board 120, and each light source 140 extends into the shell body 110 and emits detection light one-to-one to the filter part located in each optical path through hole 111; each optical fiber connector 160 is one-to-one arranged at one end of each optical path through hole 111 and is used to connect the sensing optical fiber; a plurality of photodetectors 150 are electrically connected to the circuit board 120, and each photodetector 150 is one-to-one arranged at one end of each optical path through hole 111 away from the optical fiber connector 160.

[0073] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A multi-channel demodulator, characterized in that: include: The shell body is provided with a plurality of light path through holes; A circuit board is arranged on the shell body; A filter, disposed on the shell body, comprising a filter portion extending along the radial direction of the light path through hole and penetrating the light path through hole; A plurality of light sources are electrically connected to the circuit board, each of the light sources extends into the shell body and emits detection light one by one to the filter part located at each of the light path through holes; A plurality of optical fiber connectors, each of which is arranged one-to-one at one end of each of the optical path through holes and is used to connect the sensing optical fiber; A plurality of photoelectric detectors are electrically connected to the circuit board, and each of the photoelectric detectors is arranged one-to-one at one end of each of the optical path through holes away from the optical fiber connector.

2. The multi-channel demodulator according to claim 1, characterized in that: A plurality of the optical path through holes share one optical filter, and the optical filter respectively penetrates the corresponding optical path through holes along the radial direction of the optical path through holes, and forms the optical filter parts corresponding to the corresponding light sources one by one.

3. The multi-channel demodulator according to claim 2, characterized in that: The shell body is provided with an oblique installation hole penetrating through the plurality of optical path through holes along a first direction, the optical filter is plugged into the oblique installation hole, and the first direction extends along the radial direction of the optical path through holes.

4. The multi-channel demodulator according to claim 3, characterized in that: The width of the filter along the second direction is substantially equal to the width of the inclined mounting hole along the second direction, and the second direction is perpendicular to the first direction.

5. The multi-channel demodulator according to claim 4, characterized in that: The oblique mounting hole comprises: Give way to the hole segment; Two fixed slot hole sections, the two fixed slot hole sections are located one-to-one at the two ends of the clearance hole section along the second direction, the gap width of the fixed slot hole section is substantially equal to the thickness of the filter, and the gap width of the clearance hole section is greater than the thickness of the filter, so that the filter is spaced apart from the side wall of the clearance hole section.

6. The multi-channel demodulator according to claim 3, characterized in that: The two ends of the inclined mounting hole along the first direction penetrate to the two opposite side walls of the shell body, and the two ends of the filter along the first direction are flush with the two opposite side walls of the shell body; and / or, the two ends of the filter along the first direction are coated with an adhesive layer, and the adhesive layer seals the inclined mounting hole so that the filter is glued to the inclined mounting hole.

7. The multi-channel demodulator according to claim 1, characterized in that: In the radial direction of the optical path through hole, a plurality of the optical path through holes are arranged in a row and opened in the shell body; Among them, the shell body is also provided with a plurality of light-transmitting holes which respectively connect the lower side of the shell body with each of the light path through holes one-to-one, and the lower side of the shell body refers to one side of the shell body in a third direction, and the third direction is a direction perpendicular to the plane where the plurality of light path through holes are arranged in a row.

8. The multi-channel demodulator according to claim 7, characterized in that: The bottom side of the light-transmitting hole is also provided with a receiving groove connected to the light-transmitting hole, the circuit board is arranged on the lower side of the shell body, and each of the light sources is received in each of the receiving grooves one by one.

9. The multi-channel demodulator according to claim 8, characterized in that: A buffer sleeve is further provided in the receiving groove, and the buffer sleeve is arranged around the light source; and / or, The multi-channel demodulator further includes a transfer board, the photodetector is integrated in the transfer board, the transfer board is electrically connected to the circuit board, and the transfer board is arranged facing the optical path through hole; and / or, The shell body is a CNC machined one-piece structure; and / or, The multi-channel demodulator is a fluorescent optical fiber temperature measurement demodulator.

10. A monitoring device, characterized in that: It comprises a sensing optical fiber and a multi-channel demodulator as described in any one of claims 1 to 9, wherein the sensing optical fiber is connected to the optical fiber connector, and the multi-channel demodulator is configured to perform environmental sensing through the sensing optical fiber, wherein the environmental sensing comprises one of temperature sensing and gas concentration sensing.

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