Optical demodulator and monitoring device

Abstract

The utility model provides an optical demodulator and monitoring equipment, and relates to the optical temperature measurement technology field, the optical demodulator comprises a module housing, a control panel, an optical filter disc, a light source, a PD detector, an optical fiber plug and a pressing plate, a light transmission path is arranged in the module housing, the control panel is arranged in the module housing, the optical filter disc is arranged in the module housing, and the light source is arranged in the optical fiber plug. The light source extends into the module shell, the PD detector is correspondingly arranged at the first end of the light-transmitting channel, one end of the optical fiber plug is correspondingly inserted and matched at the second end of the light-transmitting channel in a sliding mode, the other end of the optical fiber plug extends out of the module shell, and the pressing plate is fixed to the module shell and presses the optical fiber plug. The optical fiber plug is fixed at the second end of the light-transmitting channel through the pressing plate structure, no internal thread or external thread structure needs to be additionally designed, assembly is achieved without threaded connection, the machining precision requirement and the machining difficulty are lowered, the installation operation requirement is low, and the coaxiality of the optical fiber plug and the light-transmitting channel can be guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of optical temperature measurement, in particular to an optical 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, fluorescence temperature measurement technology is a technology for measuring 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 related art, the demodulator is usually provided with a fiber optic plug at the end, and measurement is achieved by inserting the optical fiber. The fiber optic plug and the module housing are usually connected by threads. Therefore, it is necessary to process internal threads on the inner wall of the light-transmitting passage and external threads on the outer peripheral surface of the fiber optic plug, which undoubtedly increases the difficulty of processing. The threaded connection makes it difficult to ensure a high coaxiality between the fiber optic plug and the light-transmitting passage. Utility Model Content

[0004] The utility model aims to provide an optical demodulator and monitoring equipment, which do not need to be connected to an optical fiber plug through threads, thereby reducing the processing difficulty and having lower installation operation requirements.

[0005] The embodiment of the utility model is achieved as follows:

[0006] A first aspect of the present application provides an optical demodulator, comprising:

[0007] The module housing is provided with a light-transmitting passage, wherein the light-transmitting passage has a first end and a second end opposite to each other along its own axial direction;

[0008] A control panel, arranged in the module housing;

[0009] An optical filter, disposed in the module housing, the optical filter comprising a filtering portion passing through the light-transmitting passage;

[0010] A light source is electrically connected to the control board, the light source extends into the module housing and emits detection light to the filter part;

[0011] A PD detector, disposed at the first end and electrically connected to the control board, for receiving the returned signal light;

[0012] An optical fiber plug, one end of which is slidably engaged with the second end, and the other end of which extends out of the module housing and is used for coaxial connection with the sensing optical fiber;

[0013] A pressing plate is fixed to the module housing and presses the optical fiber plug to limit and fix the optical fiber plug at the second end. The optical fiber plug is coaxially arranged with the light-transmitting passage.

[0014] In some embodiments, the optical fiber plug includes:

[0015] An inserting portion, coaxially and slidably inserted into the second end;

[0016] The connecting part extends out of the module housing and is connected to the plug-in part. The connecting part passes through the pressing plate and is provided with a plug hole coaxially connected to the light-transmitting passage. The plug hole is used to insert the sensing optical fiber.

[0017] In some embodiments, a stop protrusion is provided on the outer surface of one end of the plug-in portion connected to the connecting portion, and a receiving groove connected to the second end is opened on the outer surface of the module shell, the stop protrusion is assembled in the receiving groove, and the pressure plate is pressed on the side of the stop protrusion away from the second end.

[0018] In some embodiments, the stop protrusion is an annular protrusion, the stop protrusion has an anti-rotator portion that cooperates with the accommodating groove to prevent rotation, and the stop protrusion is non-rotatably accommodated in the accommodating groove.

[0019] In some embodiments, the anti-rotor portion is a notch portion formed on the stop protrusion, and the stop protrusion is a non-rotating structure.

[0020] In some embodiments, the light-transmitting passage includes a small-diameter hole segment and a large-diameter hole segment that are sequentially connected along a direction from the first end to the second end, a stop step is formed at the connection between the small-diameter hole segment and the large-diameter hole segment, the optical fiber plug is inserted into the large-diameter hole segment, and the optical demodulator also includes a lens limited between the stop step and the optical fiber plug.

[0021] In some embodiments, a first gasket is sandwiched between the lens and the stop step; and / or a second gasket is sandwiched between the lens and the optical fiber plug.

[0022] In some embodiments, there are multiple light-transmitting passages, and the optical fiber plug is respectively disposed at one end of each of the light-transmitting passages. Each of the optical fiber plugs respectively passes through the pressure plate, so that each of the optical fiber plugs is fixed along the axial direction of the optical fiber plug by a pressure plate.

[0023] In some embodiments, in the radial direction of the light-transmitting passage, a plurality of the light-transmitting passages are arranged in a row and opened in the module housing;

[0024] Among them, the module shell is also provided with a plurality of light-transmitting holes which respectively connect the lower side of the module shell with each of the light-transmitting passages one-to-one, and a receiving groove which connects the light-transmitting holes, the control board is arranged on the lower side of the module shell, the light sources are received one-to-one in the receiving grooves, the lower side of the module shell refers to one side of the module shell in a third direction, and the third direction is a direction perpendicular to the plane where the plurality of light-transmitting passages are arranged in a row.

[0025] In some embodiments, the module housing is a CNC integrally processed structure; and / or,

[0026] A buffer sleeve is disposed in each of the accommodating grooves, the buffer sleeve is disposed around the corresponding light source and abuts against the inner wall of the corresponding accommodating groove; and / or,

[0027] The optical demodulator further includes a switching board, the PD detector is electrically connected to the control board via the switching board, and the switching board is fixed to a side of the module housing through which the first end passes; and / or,

[0028] The optical filter is a filter; and / or,

[0029] The pressing plate is provided with a conducting hole, the conducting hole is connected to the light-transmitting passage, and the optical fiber plug passes through the conducting hole.

[0030] A first aspect of the present application provides a monitoring device, which includes an optical demodulator as described in any embodiment, wherein the optical demodulator is configured to perform environmental sensing through a sensing optical fiber, and the environmental sensing includes one of temperature sensing and gas concentration sensing.

[0031] The beneficial effects of the embodiments of the utility model include:

[0032] The optical demodulator and monitoring equipment provided by the embodiment of the utility model are provided with a light-transmitting passage in a module housing, the light-transmitting passage having a first end and a second end opposite to each other along its own axial direction; a control board is arranged in the module housing; an optical filter is arranged in the module housing, the optical filter comprises a filtering part passing through the light-transmitting passage; a light source is electrically connected to the control board, the light source extends into the module housing and emits detection light to the filtering part; a PD detector is arranged at the first end and electrically connected to the control board for receiving the returned signal light; one end of the optical fiber plug is slidably fitted with the second end, and the other end extends out of the module housing and is used for coaxially connecting the sensing optical fiber; a pressure plate is fixed to the module housing and presses the optical fiber plug so that the optical fiber plug is limited and fixed at the second end, and the optical fiber plug is coaxially arranged with the light-transmitting passage. Compared with the related art, in the utility model, one end of the fiber optic plug is slidably fitted with the second end, and the fiber optic plug is fixed to the second end of the light-transmitting passage through a pressure plate structure. There is no need for the fiber optic plug to be threadedly assembled on the module housing, and there is no need to additionally design internal and external thread structures to realize the assembly of the fiber optic plug and the module housing, which reduces the processing accuracy requirements and the processing difficulty, and has lower installation operation requirements, which is conducive to ensuring the coaxiality of the fiber optic plug and the light-transmitting passage. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] 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.

[0034] Figure 1 A schematic diagram of the external structure of an optical demodulator provided in an embodiment of the utility model;

[0035] Figure 2 A cross-sectional view of the internal structure of an optical demodulator provided by an embodiment of the utility model;

[0036] Figure 3 for Figure 2 A partial enlarged schematic diagram of middle III;

[0037] Figure 4 for Figure 2 A partial enlarged schematic diagram of middle Ⅳ;

[0038] Figure 5 A schematic diagram of the exploded structure of an optical demodulator provided in an embodiment of the utility model;

[0039] Figure 6 for Figure 5 A schematic diagram of the structure of the module housing;

[0040] Figure 7 for Figure 5 A cross-sectional view of the module housing;

[0041] Figure 8 for Figure 7 A partial enlarged schematic diagram of section VIII.

[0042] icon:

[0043] 100-optical demodulator; 110-module housing; 111-light-transmitting passage; 112-accommodating groove; 113-stopping step; 114-mounting inclined hole; 115-yielding section; 116-fixing section; 120-control board; 130-optical filter; 140-light source; 141-light-transmitting hole; 142-accommodating groove; 143-buffer sleeve; 150-PD detector; 160-optical fiber plug; 161-plug-in part; 162-connecting part; 163-connecting part; 164-stopping protrusion; 165-lens; 170-pressing plate; 171-conducting hole; 180-packaging sheet. DETAILED DESCRIPTION

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] As disclosed in the background technology, the demodulator is usually provided with a fiber optic plug at the end, and measurement is achieved by inserting the optical fiber. The fiber optic plug and the module housing are usually connected by threads. Therefore, it is necessary to process internal threads on the inner wall of the light-transmitting passage and external threads on the outer peripheral surface of the fiber optic plug, which undoubtedly increases the difficulty of processing. In addition, the threaded connection makes it difficult to ensure a high coaxiality between the fiber optic plug and the light-transmitting passage.

[0051] In order to solve the above problems, the embodiment of the utility model provides a novel optical demodulator, and the specific structure and principle of the optical demodulator are described in detail below.

[0052] Please refer to Figures 1 to 4 In some embodiments, the optical demodulator 100 does not need to be connected to the optical fiber plug 160 by threading, which reduces the processing difficulty and cost, and has a low installation precision requirement, which is conducive to improving assembly efficiency. It can play a good protective role for the optical filter 130, prevent external dust or impurities from entering the interior, ensure the transparency of the optical path and the cleanliness of the optical filter 130; it can limit the optical filter 130 to prevent looseness and affect the filtering effect.

[0053] Reference Figures 1 to 3 In some embodiments, an optical demodulator 100 includes a module housing 110, a control board 120, an optical filter 130, a light source 140, a PD detector 150, an optical fiber plug 160 and a pressure plate 170. The module housing 110 is provided with a light-transmitting passage 111, and the light-transmitting passage 111 has a first end and a second end opposite to each other along its own axis. The control board 120 is disposed in the module housing 110, and the optical filter 130 is disposed in the module housing 110. The optical filter 130 includes a filtering portion passing through the light-transmitting passage 111. The light source 140 is electrically connected to the control board 120, and the light source 140 extends into the module housing 110 and emits detection light to the filter part. The PD detector 150 is arranged at the first end of the light-transmitting passage 111 and is electrically connected to the control board 120. The PD detector 150 is used to receive the returned signal light. One end of the optical fiber plug 160 is slidably fitted with the second end of the light-transmitting passage 111, and the other end of the optical fiber plug 160 extends out of the module housing 110 and is used to coaxially connect the sensing optical fiber. The pressure plate 170 is fixed to the module housing 110 and presses the optical fiber plug 160 so that the optical fiber plug 160 is limited and fixed at the second end of the light-transmitting passage 111. The optical fiber plug 160 is coaxially arranged with the light-transmitting passage 111.

[0054] Reference Figures 1 to 7 The optical fiber plug 160 is correspondingly arranged at one end of the light-transmitting passage 111 and partially extends out of the module housing 110. The optical fiber plug 160 is used to connect the sensing optical fiber. The pressure plate 170 is detachably arranged on the end face of the module housing 110 and is ringed on the end of the optical fiber plug 160 extending out of the module housing 110 to fix the optical fiber plug 160. The control board 120 is arranged inside the module housing 110. The light source 140 is arranged on the control board 120. The light source 140 extends into the module housing 110. Specifically, the light source 140 is located in the middle of the light-transmitting passage 111. The optical filter 130 is arranged in the module housing 110 and passes through the light-transmitting passage 111. The PD detector 150 is correspondingly arranged at one end of the light-transmitting passage 111 away from the optical fiber plug 160.

[0055] It is worth noting that in some embodiments of the present application, a light-transmitting passage 111 is set in the module housing 110, the optical fiber plug 160 is correspondingly set at one end of the light-transmitting passage 111 and is used to connect the sensing optical fiber, the PD detector 150 is correspondingly set at the other end of the light-transmitting passage 111, the control board 120 is set inside the module housing 110, the light source 140 is set on the control board 120, and extends into the middle of the light-transmitting passage 111 to achieve light output; and the optical filter 130 is detachably set in the module housing 110, and extends obliquely to the middle of multiple light-transmitting passages 111; in addition, the pressure plate 170 is detachably set on the end plate of the module housing 110, and is ringed on one end of the optical fiber plug 160 extending out of the module housing 110, thereby fixing the optical fiber plug 160. When in use, light is emitted from the light source 140, which is reflected by the optical filter 130 and then emitted through the optical fiber plug 160, and finally enters the sensing optical fiber, and is transmitted to the end to be measured through the sensing optical fiber to generate signal light and transmit it back. After the signal light is transmitted back through the optical filter 130, it is received by the PD detector 150, and then demodulated to obtain the required information. The optical fiber plug 160 is fixed by using the pressing plate 170. The optical fiber plug 160 does not need to be threadedly assembled on the module housing 110, avoiding the need to additionally design corresponding internal and external threads on the optical fiber plug 160 and the light-transmitting passage 111. The optical fiber plug 160 does not need to be connected by threads, which reduces the processing difficulty and cost, and the installation operation requirements are relatively low, which is conducive to improving assembly efficiency.

[0056] See also Figures 4 to 6 In some embodiments, a through hole 171 is formed on the pressing plate 170, the through hole 171 is connected to the light-transmitting passage 111, and the optical fiber plug 160 passes through the through hole 171. The shape of the through hole 171 matches the shape of the portion of the optical fiber plug 160 extending out of the module housing 110, and the portion of the optical fiber plug 160 extending out of the module housing 110 is assembled in the through hole 171.

[0057] In some embodiments, see Figures 4 to 6 The optical fiber plug 160 includes a plug-in portion 161 and a connecting portion 163. The plug-in portion 161 is coaxially slid into the second end of the light-transmitting passage 111. The connecting portion 163 extends out of the module housing 110 and is connected to the plug-in portion 161. The connecting portion 163 passes through the pressure plate 170 and is provided with a socket coaxially connected to the light-transmitting passage 111, and the socket is used to insert the sensing optical fiber.

[0058] In some embodiments, see Figures 4 to 6The optical fiber plug 160 also includes a connector 162, which is sleeved on the outside of the core of the sensing optical fiber and detachably assembled on the connecting portion 163. Here, the connecting portion 163 extends out of the end face of the module housing 110, which facilitates the insertion of the connector 162. The outside of the sensing optical fiber is fixed by the connector 162. On the one hand, the sensing optical fiber can be fixed to ensure its accurate positioning. On the other hand, through the assembly of the connector 162 and the connecting portion 163, it can ensure that the sensing optical fiber is accurately and reliably inserted into the corresponding position of the connecting portion 163. The sensing optical fiber is coaxially inserted into the jack of the connecting portion 163, ensuring the accuracy and reliability of the optical path.

[0059] In some embodiments, see Figures 4 to 6 A stopper 164 is convexly provided on the outer surface of one end of the plug-in portion 161 connected to the connecting portion 163, a receiving groove 112 communicating with the second end of the light-transmitting passage 111 is provided on the outer surface of the module housing 110, the stopper 164 is assembled in the receiving groove 112, and the pressing plate 170 is pressed on the side of the stopper 164 away from the second end of the light-transmitting passage 111. Specifically, the stopper 164 is integrally formed and arranged on the plug-in portion 161, and the size of the stopper 164 is larger than the size of the conducting hole 171 of the pressing plate 170, so as to prevent the stopper 164 from slipping out of the conducting hole 171. Since the pressing plate 170 can be pressed against the outer surface of the stopper 164, the plug-in portion 161 is pressed and fixed.

[0060] In some embodiments, see Figures 4 to 6 , the stop protrusion 164 is an annular protrusion, and the stop protrusion 164 has an anti-rotation portion that matches the shape of the receiving groove to prevent rotation, and the stop protrusion 164 is non-rotatably received in the receiving groove 112. Specifically, the receiving groove 12 is not a circular groove structure, and it can be adapted to the shape of the plug-in portion 161, so that the plug-in portion 161 can be fixed in the circumferential direction to prevent rotation, thereby preventing the plug-in portion 161 from rotating. Preferably, the anti-rotation portion is a notch portion formed on the stop protrusion 164, and the stop protrusion 164 is a non-rotating body structure. The receiving groove 112 can be a major arc shape to further prevent the plug-in portion 161 from rotating in the receiving groove 112. Of course, in other preferred embodiments of the utility model, the receiving groove 112 can also be other shapes, such as a rectangle or an ellipse, etc., which are not specifically limited here.

[0061] In some embodiments, see Figures 4 to 6 The outer surface of the stop protrusion 164 is flush with the end surface of the module housing 110 . After the pressing plate 170 is installed in place, the pressing plate 170 can be attached to the end surface of the module housing 110 and the outer surface of the stop protrusion 164 at the same time.

[0062] In some embodiments, see Figure 1 , Figure 2, Figure 4 and Figure 7 The light-transmitting passage 111 includes a small-diameter hole section and a large-diameter hole section that are connected in sequence along a direction from the first end of the light-transmitting passage 111 to the second end of the light-transmitting passage 111. A stop step 113 is formed at the connection between the small-diameter hole section and the large-diameter hole section. The optical fiber plug 160 is plugged into the large-diameter hole section. The optical demodulator 100 also includes a lens 165 limited between the stop step 113 and the optical fiber plug 160. Specifically, a lens 165 is provided between the plug-in portion 161 and the stop step 113. The lens 165 is limited to the stop step 113 and is used to correspond to the sensing optical fiber. By providing the stop step 113, the installation position of the lens 165 and the plug-in portion 161 can be determined, which facilitates the installation and positioning of the lens 165 and the plug-in portion 161.

[0063] In some embodiments, reference Figure 2 and Figure 3 , a first gasket (not shown in the figure) is sandwiched between the lens 165 and the stop step 113, and a second gasket (not shown in the figure) is sandwiched between the lens 165 and the optical fiber plug 160. In some embodiments, the first gasket and the second gasket can be set selectively or simultaneously. Preferably, a first gasket is provided on one side of the lens 165, and the first gasket abuts on the stop step 113, and a second gasket is provided on the other side of the lens 165, and the plug-in portion 161 abuts on the second gasket. By providing the first gasket and the second gasket, the lens 165 can be stably installed, and at the same time, a buffering effect can be played to prevent the plug-in portion 161 and the stop step 113 from damaging the edge of the lens 165.

[0064] In addition, the demodulator in the related art is usually a single-channel demodulator, which still has some problems in practical applications. First, this kind of 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, from the economic point of view, the cost of assembling multiple single-channel demodulators into a multi-channel demodulator is high, and the manufacturing process is relatively complicated.

[0065] See also Figures 1 to 3 , Figures 5 to 8In some embodiments, there are multiple light-transmitting passages 111. In the radial direction of the light-transmitting passages 111, one end of each light-transmitting passage 111 is provided with an optical fiber plug 160, and each optical fiber plug 160 passes through a pressing plate 170, so as to limit and fix the optical fiber plug 160 along the axial direction of the optical fiber plug 160 through a pressing plate 170. When preparing the module housing 110, multiple light-transmitting passages 111 are processed and formed on one module housing 110, and each light-transmitting passage 111 is provided with a light source 140, an optical filter 130, a PD detector 150 and an optical fiber plug 160. By opening multiple light-transmitting passages 111 in one module housing 110, multi-channel and multi-point measurement is realized. The multi-channel integrated structure reduces the number of parts, has a high degree of integration, is easy to process and produce, and reduces costs. At the same time, the precise setting of multiple light-transmitting passages 111 can ensure high-precision measurement requirements.

[0066] In some embodiments, reference Figures 3 to 7 , multiple light-transmitting passages 111 are arranged in a row in the radial direction thereof and are opened in the module housing 110, and an optical fiber plug 160 is arranged at one end of each light-transmitting passage 111, and a PD detector 150 is arranged at the other end of the light-transmitting passage 111, and each optical fiber plug 160 passes through the pressing plate 170 respectively. Multiple light sources 140 are arranged on the control board 120, and the multiple light sources 140 extend into the module housing 110 correspondingly, specifically, correspondingly located in the middle of the multiple light-transmitting passages 111, and multiple through holes 171 are opened on the pressing plate 170, and the multiple optical fiber plugs 160 are correspondingly assembled in the multiple through holes 171. In addition, multiple light-transmitting passages 111 can share one optical filter 130, which reduces the number of parts and simplifies the assembly and manufacturing process.

[0067] In addition, in some embodiments, reference Figures 3 to 7 The side wall of the module housing 110 is provided with an oblique mounting hole 114 penetrating to a plurality of light-transmitting passages 111. The optical filter 130 is plugged into the oblique mounting hole 114 and passes through the plurality of light-transmitting passages 111. The optical filter 130 corresponds to the light source 140 and adopts a plug-in method, which has a simple structure and fast assembly.

[0068] In some embodiments, reference Figures 1 to 8, the two ends of the installation inclined hole 114 penetrate to the two opposite side walls of the module housing 110, the two ends of the optical filter 130 along the first direction are flush with the two opposite side walls of the module housing 110, and the width of the optical filter 130 along the second direction is adapted to the width of the installation inclined hole 114, that is, the size is substantially equal, which is generally an explanation of the processing error and the assembly error, wherein the second direction is perpendicular to the first direction. Among them, the optical filter 130 can be in the shape of a rectangular sheet, and the first direction refers to the long side direction of the optical filter 130, and the second direction refers to the short side direction of the optical filter 130. In the long side direction, the length of the optical filter 130 is substantially the same as the length of the installation inclined hole 114, thereby ensuring that the optical filter 130 will not protrude from the module housing 110 after being installed in place, and facilitating the subsequent loading of the packaging sheet 180. In the short-side direction, the width of the optical filter 130 is the same as the width of the installation inclined hole 114 , which ensures that the optical filter 130 can be exactly installed in the installation inclined hole 114 to avoid displacement during use.

[0069] In addition, in the related art, the optical filter 130 needs to be installed after opening the installation inclined hole 114 on the module housing 110. After installation, no additional protective structure is usually set, which causes external dust and impurities to easily enter the interior through the opening, affecting the transparency of the light path and the cleanliness of the optical filter 130. In addition, the fixing effect of the optical filter 130 is poor and it is easy to loosen and affect its filtering effect.

[0070] In this regard, in some embodiments, reference Figures 1 to 5 , a packaging sheet 180 is also attached to the side wall of the module housing 110, and the packaging sheet 180 covers the installation inclined hole 114 to stop the optical filter 130. Since in some embodiments, the packaging sheet 180 is additionally designed, the packaging sheet 180 covers the installation inclined hole 114, which can, on the one hand, play a good protective role for the optical filter 130 and prevent external dust or impurities from entering the module housing 110, thereby ensuring the transparency of the light path and the cleanliness of the optical filter 130, and on the other hand, can stop the optical filter 130 to prevent the optical filter 130 from falling out of the installation socket and affecting the filtering effect.

[0071] In some embodiments, reference Figure 3 , Figures 7 and 8The mounting inclined hole 114 includes a giving way section 115 distributed along the second direction and fixed sections 116 located at both ends of the giving way section 115. The gap width of the fixed section 116 is adapted to the thickness of the optical filter 130, that is, it is substantially equal. The gap width of the giving way section 115 is greater than the thickness of the optical filter 130, so that the optical filter 130 is spaced apart from the side wall of the giving way section 115. Specifically, the installation inclined hole 114 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 yielding section 115, and the narrower parts at both ends are configured as fixed sections 116, wherein the gap width of the fixed section 116 is substantially the same as the thickness of the optical filter 130, so that both ends of the optical filter 130 along the short side direction can be embedded in the fixed section 116; and the gap width of the yielding section 115 is relatively large and greater than the thickness of the optical filter 130, so that the effective area of ​​the optical filter 130 will not contact the two side edges of the installation inclined hole 114 during the installation process to cause scratches, thereby effectively protecting the optical filter 130.

[0072] In some embodiments, reference Figure 2 , Figure 3 and Figure 7 In the radial direction of the light-transmitting passage 111, a plurality of light-transmitting passages 111 are arranged in a row in parallel and are opened in the module housing 110; wherein, the module housing 110 is further provided with a plurality of light-transmitting holes 141 which respectively connect the lower side of the module housing 110 with each light-transmitting passage 111 one-to-one, and a receiving groove 142 which connects the light-transmitting holes 141; the control board 120 is arranged on the lower side of the module housing 110; the light sources 140 are received in the receiving groove 142 one-to-one; the lower side of the module housing 110 refers to one side of the module housing 110 in a third direction, and the third direction is a direction perpendicular to the plane where the plurality of light-transmitting passages 111 are arranged in a row. Specifically, the control board 120 is arranged at the lower side of a plurality of light-transmitting passages 111, and a light-transmitting hole 141 corresponding to the optical filter 130 is provided in the middle of each light-transmitting passage 111. A receiving groove 142 is also formed at the bottom side of the light-transmitting hole 141, and 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, and 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 in the receiving groove 142 during assembly. The provision of the buffer sleeve 143 ensures the safe assembly of the light source 140 and prevents the light source 140 from colliding with or scratching the inner wall of the light-transmitting hole 141 or the receiving groove 142 .

[0073] In some embodiments, the module housing 110 is a CNC integrated processing structure, so that multiple light-transmitting through holes 111 can be processed in one piece. The CNC integrated processing has high processing accuracy and can form a high-precision module housing 110. During processing, the workpiece to be processed can be clamped at one time, and then various punching holes can be completed, which can simplify the processing process.

[0074] In some embodiments, reference Figure 1 and Figure 2 The optical demodulator 100 further includes a switching board (not numbered in the figure), through which the PD detector 150 is electrically connected to the control board 120 , and the switching board is fixed to a side of the module housing 110 through which the first end passes.

[0075] The embodiment of the utility model further provides a monitoring device, which includes the aforementioned optical demodulator and sensing optical fiber. The optical demodulator 100 is configured to perform environmental sensing through the sensing optical fiber. The environmental sensing may include one of temperature sensing and gas concentration sensing.

[0076] In summary, in the optical demodulator 100 and the monitoring device provided in some embodiments of the present application, a light-transmitting passage 111 is arranged in the module housing 110, a control board 120 is arranged in the module housing 110, an optical filter 130 is arranged in the module housing 110, the optical filter 130 includes a filtering portion passing through the light-transmitting passage 111, a light source 140 is electrically connected to the control board 120, the light source 140 extends into the module housing 110 and emits detection light to the filtering portion, and a PD detector 150 is correspondingly arranged at a first end of the light-transmitting passage 111 and electrically connected to the control board 120, one end of the optical fiber plug 160 is correspondingly slidably fitted in the second end of the light-transmitting passage 111, and the other end of the optical fiber plug 160 extends out of the module housing 110 and is used for coaxially connecting the sensing optical fiber; in addition, a pressing plate 170 is fixed to the module housing 110 and presses the optical fiber plug 160 so that the optical fiber plug 160 is limited and fixed at the second end of the light-transmitting passage 111, and the optical fiber plug 160 is coaxially arranged with the light-transmitting passage 111. When in use, light is emitted by the light source 140, which is reflected by the optical filter 130 and then emitted through the optical fiber plug 160, and then transmitted to the end to be measured through the optical fiber and then returned. The returned light signal is separated by the optical filter 130 and received by the PD detector 150, and then demodulated to obtain the required information of the optical fiber end.

[0077] Compared with the related art, the embodiment of the utility model realizes the limiting fixation of the optical fiber plug 160 by adopting the pressure plate 170. There is no need for the optical fiber plug 160 to be threadedly assembled on the module housing 110, thus avoiding the additional design of internal and external thread structures. There is no need to connect the optical fiber plug by threads, which reduces the manufacturing difficulty and cost, and has low installation operation requirements, thereby greatly improving the assembly efficiency.

[0078] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An optical demodulator, characterized in that: include: The module housing is provided with a light-transmitting passage, wherein the light-transmitting passage has a first end and a second end opposite to each other along its own axial direction; A control panel, arranged in the module housing; An optical filter, disposed in the module housing, the optical filter comprising a filtering portion passing through the light-transmitting passage; A light source is electrically connected to the control board, the light source extends into the module housing and emits detection light to the filter part; A PD detector, disposed at the first end and electrically connected to the control board, for receiving the returned signal light; An optical fiber plug, one end of which is slidably engaged with the second end, and the other end of which extends out of the module housing and is used for coaxial connection with the sensing optical fiber; A pressing plate is fixed to the module housing and presses the optical fiber plug to limit and fix the optical fiber plug at the second end. The optical fiber plug is coaxially arranged with the light-transmitting passage.

2. The optical demodulator according to claim 1, characterized in that: The optical fiber plug comprises: An inserting portion, coaxially and slidably inserted into the second end; The connecting part extends out of the module housing and is connected to the plug-in part. The connecting part passes through the pressing plate and is provided with a plug hole coaxially connected to the light-transmitting passage. The plug hole is used to insert the sensing optical fiber.

3. The optical demodulator according to claim 2, characterized in that: A stop protrusion is provided on the outer surface of one end of the plug-in portion connected to the connecting portion, and a receiving groove connected to the second end is opened on the outer surface of the module shell. The stop protrusion is assembled in the receiving groove, and the pressure plate is pressed on the side of the stop protrusion away from the second end.

4. The optical demodulator according to claim 3, characterized in that: The stop convex portion is an annular protrusion, and the stop convex portion has an anti-rotator portion that cooperates with the accommodating groove to prevent rotation, and the stop convex portion is non-rotatably accommodated in the accommodating groove.

5. The optical demodulator according to claim 4, characterized in that: The anti-rotor portion is a notch portion formed on the stop convex portion, and the stop convex portion is a non-rotating structure.

6. The optical demodulator according to claim 1, characterized in that: The light-transmitting passage includes a small-diameter hole segment and a large-diameter hole segment connected in sequence along a direction from the first end to the second end, a stop step is formed at the connection between the small-diameter hole segment and the large-diameter hole segment, the optical fiber plug is inserted into the large-diameter hole segment, and the optical demodulator also includes a lens limited between the stop step and the optical fiber plug.

7. The optical demodulator according to claim 6, characterized in that A first gasket is sandwiched between the lens and the stop step; and / or a second gasket is sandwiched between the lens and the optical fiber plug.

8. The optical demodulator according to any one of claims 1 to 7, characterized in that: There are multiple light-transmitting passages, and one end of each of the light-transmitting passages is provided with the optical fiber plug, and each optical fiber plug passes through the pressure plate, so that each optical fiber plug is fixed along the axial direction of the optical fiber plug by a pressure plate.

9. The optical demodulator according to claim 8, characterized in that: In the radial direction of the light-transmitting passage, a plurality of the light-transmitting passages are arranged in a row and opened in the module housing; Among them, the module shell is also provided with a plurality of light-transmitting holes which respectively connect the lower side of the module shell with each of the light-transmitting passages one-to-one, and a receiving groove which connects the light-transmitting holes, the control board is arranged on the lower side of the module shell, the light sources are received one-to-one in the receiving grooves, the lower side of the module shell refers to one side of the module shell in a third direction, and the third direction is a direction perpendicular to the plane where the plurality of light-transmitting passages are arranged in a row.

10. The optical demodulator according to claim 9, characterized in that: The module housing is a CNC integrated processing structure; and / or, A buffer sleeve is disposed in each of the accommodating grooves, the buffer sleeve is disposed around the corresponding light source and abuts against the inner wall of the corresponding accommodating groove; and / or, The optical demodulator further includes a switching board, the PD detector is electrically connected to the control board via the switching board, and the switching board is fixed to a side of the module housing through which the first end passes; and / or, The optical filter is a filter; and / or, The pressing plate is provided with a conducting hole, the conducting hole is connected to the light-transmitting passage, and the optical fiber plug passes through the conducting hole.

11. A monitoring device, characterized in that: The optical demodulator comprises the optical demodulator as claimed in any one of claims 1 to 10, wherein the optical demodulator is configured to perform environmental sensing through a sensing optical fiber, wherein the environmental sensing comprises one of temperature sensing and gas concentration sensing.

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