An optical path guide and a fluorescence dissolved oxygen sensor

Abstract

An optical path guide and a fluorescence dissolved oxygen sensor belong to the technical field of fluorescence dissolved oxygen detection. The optical path guide includes a main body portion. The main body portion includes a concave surface and mounting holes, and at least two mounting holes are provided; the axes of the mounting holes intersect with the central axis of the main body portion on the side where the concave surface is provided; the mounting holes include a receiving hole for accommodating an optoelectronic device or a light-emitting light source and an optical path hole for passing the emitted light and the received light; the optical path hole is located at the end of the main body portion relatively close to the concave surface, and the aperture of the optical path hole is smaller than the aperture of the receiving hole; the concave direction of the concave surface is from the optical path hole to the receiving hole. In this application, by providing a concave surface and making the aperture of the optical path hole smaller than the aperture of the receiving hole, the angle of the light emitted by the light-emitting light source is restricted, and the probability that the emitted light of the light-emitting light source is reflected by the inner wall of the mounting hole or the like to the optoelectronic device is reduced, so that the fluorescence dissolved oxygen sensor has high accuracy.

Description

Technical Field

[0001] The present invention belongs to the technical field of fluorescence dissolved oxygen detection, and particularly relates to an optical path guide and a fluorescence dissolved oxygen sensor. Background Art

[0002] A fluorescence dissolved oxygen sensor is a high-precision sensor for measuring the concentration of dissolved oxygen in water based on the principle of fluorescence quenching. Generally, an excitation light source irradiates a fluorescence film to cause the fluorescence film to generate fluorescence, and according to the fluorescence quenching effect of the fluorescence film under the action of dissolved oxygen in water, the dissolved oxygen concentration is measured by receiving the sensor.

[0003] Chinese Patent CN220289368U discloses a dissolved oxygen detection component and a detection device based on the fluorescence quenching method, including a mounting base, on which a connection hole for receiving the receiving end of the sensor and a light source mounting hole for mounting the light source are provided; when the distance H between its fluorescence film and the receiving sensor is smaller, the fluorescence detection voltage effect is better, and the more light the sensor receives. Its preferred embodiment is when the distance H between its fluorescence film and the receiving sensor is 4.9 mm, the distance L between the excitation light source and the fluorescence film is 8.9 mm, and the included angle α between the extension line of the central axis of each light source mounting hole and the central axis of the connection hole is 55°, and its fluorescence detection voltage effect is the best, and the sensor receives the most light.

[0004] However, when the distance H between the fluorescence film and the receiving sensor is small and the included angle α is large, some of the light rays emitted by the light emitting source will be reflected by the inner wall of the mounting hole and the like to the receiving sensor, and these light rays will interfere with the receiving sensor to receive the fluorescence emitted by the fluorescence film, resulting in a reduction in the accuracy of the fluorescence dissolved oxygen sensor.

[0005] Therefore, it is urgent to develop an optical path guide and a fluorescence dissolved oxygen sensor to solve the problems in the prior art. Summary of the Invention

[0006] The object of the present invention is to provide an optical path guide and a fluorescence dissolved oxygen sensor. By setting the surface of the optical path guide close to the optical path hole as a concave surface, the optical path hole restricts the angle of the light rays emitted by the light emitting source, reducing the probability that the light rays emitted by the light emitting source are reflected by the inner wall of the mounting hole and the like to the optoelectronic device, so as to solve the problem that a large amount of the light rays emitted by the light emitting source of some fluorescence dissolved oxygen detection devices are reflected by the inner wall of the mounting hole and the like to the optoelectronic device, interfering with the optoelectronic device to receive and measure fluorescence, resulting in a reduction in the accuracy of the fluorescence dissolved oxygen sensor.

[0007] To solve the above technical problems, the specific technical solutions of the present invention are as follows:

[0008] An optical path guide includes a main body portion. The main body portion includes a concave surface and mounting holes, and at least two mounting holes are provided. The axis of the mounting hole intersects with the central axis of the main body portion on the side where the concave surface is provided on the main body portion.

[0009] The mounting hole includes a receiving hole for accommodating an optoelectronic device or a light-emitting light source and an optical path hole for transmitting and receiving light. The optical path hole is located at the end of the main body portion relatively close to the concave surface, and the aperture of the optical path hole is smaller than the aperture of the receiving hole. The concave direction of the concave surface is from the optical path hole to the receiving hole.

[0010] In this application, by making the aperture of the optical path hole smaller than the aperture of the receiving hole, the angle of the light emitted by the light-emitting light source is restricted, and a concave hole with a concave direction from the optical path hole to the receiving hole is provided, thereby restricting the angle of the light emitted by the light-emitting light source, reducing the probability that the light emitted by the light-emitting light source is reflected by the inner wall of the mounting hole or the like to the optoelectronic device, so as to improve the accuracy of the fluorescence dissolved oxygen sensor with the optical path guide of this application.

[0011] Furthermore, the mounting holes are arranged in central symmetry, and the lowest point of the concave surface is located at the middle position of the concave surface. The concave surface is a reflecting surface for reflecting light in a direction away from the concave surface.

[0012] In this application, the concave surface with the lowest point located in the middle cooperates with the mounting holes arranged in central symmetry, so that the distance between the opening of the optical path hole of each mounting hole and the fluorescence film after assembly is the same, making the concave surface have a better reflection effect of reflecting light in a direction away from the concave surface, further reducing the probability that the light emitted by the light-emitting light source is reflected by the inner wall of the mounting hole or the like to the optoelectronic device, and improving the accuracy of the fluorescence dissolved oxygen sensor. At the same time, this structural design facilitates the preparation of the optical path guide and saves the manufacturing cost.

[0013] Furthermore, it further includes light-shielding plates. The number of light-shielding plates is the same as the number of mounting holes, and the multiple light-shielding plates and the multiple mounting holes are arranged at intervals. The light-shielding plates are arranged on the side of the main body portion relatively close to the receiving hole.

[0014] In this application, by arranging multiple light-shielding plates arranged at intervals with the mounting holes, the light emitted from the part of the light-emitting diode that does not completely enter the mounting hole is blocked, thereby reducing the mutual interference between the light sources and helping to improve the accuracy of the fluorescence dissolved oxygen sensor.

[0015] To solve the problem that a large amount of the light emitted by the light-emitting light source of some fluorescence dissolved oxygen sensors is reflected by the inner wall of the mounting hole or the like to the optoelectronic device, interfering with the optoelectronic device to receive and measure fluorescence, resulting in a reduction in the accuracy of the fluorescence dissolved oxygen sensor. This application also provides a fluorescence dissolved oxygen sensor, including:

[0016] A main housing;

[0017] The lens unit is connected to the main housing and includes a lens portion, a lens disposed on the lens portion, and a fluorescent film connected to the lens;

[0018] The optical path director is disposed in the main housing; the optical path director includes a main body portion, the main body portion includes a concave surface and mounting holes, and at least two mounting holes are provided; the axis of the mounting hole intersects with the central axis of the main body portion on the side where the concave surface is provided; the mounting hole includes a receiving hole for accommodating a photoelectric device or a light-emitting light source and an optical path hole for transmitting and receiving light; the optical path hole is located at the end of the main body portion relatively close to the concave surface, and the aperture of the optical path hole is smaller than the aperture of the receiving hole; the concave direction of the concave surface is from the optical path hole to the receiving hole;

[0019] The first circuit board is disposed in the main housing; a photoelectric device and a light-emitting light source are disposed on the first circuit board, the photoelectric device and the light-emitting light source are both electrically connected to the first circuit board, the first circuit board is connected to the optical path director, and the photoelectric device and the light-emitting light source are located in the mounting holes;

[0020] The second circuit board is disposed in the main housing and is electrically connected to the first circuit board.

[0021] In this application, by making the aperture of the optical path hole smaller than the aperture of the receiving hole, the angle of the light emitted by the light-emitting light source is restricted, and a concave hole with a concave direction from the optical path hole to the receiving hole is provided, thereby restricting the angle of the light emitted by the light-emitting light source, reducing the probability that the light emitted by the light-emitting light source is reflected by the inner wall of the mounting hole or the like to the photoelectric device, and improving the accuracy of the fluorescence dissolved oxygen sensor of this application.

[0022] Furthermore, the optical path director includes a light-shielding plate, the number of the light-shielding plates is the same as the number of the mounting holes, and the plurality of light-shielding plates are arranged at intervals with the plurality of mounting holes; the light-shielding plate is disposed on the side of the main body portion relatively close to the first circuit board.

[0023] In this application, by providing the light-shielding plate to block the light emitted from the part of the light-emitting diode that does not completely enter the mounting hole, the mutual interference between the light sources is reduced, which helps to improve the accuracy of the fluorescence dissolved oxygen sensor.

[0024] The first circuit board is provided with a clamping hole, the main body portion is provided with a clamping buckle for clamping with the clamping hole, and the main body portion is clamped with the first circuit board.

[0025] In this application, by providing a clamping buckle on the main body portion and a clamping hole on the first circuit board, the main body portion can be connected and fixed to the circuit board, so as to complete the fixation of the optical path director and the internal structure of the fluorescence dissolved oxygen sensor, without additional fixing structures, which helps to save costs and is beneficial to reducing the size of the sensor. At the same time, the clamping buckle design makes the installation of the optical path director convenient, fast and reliable.

[0026] Further, a plurality of light-shielding plates are arranged in central symmetry about the central axis of the main body portion. The length direction of the light-shielding plate is parallel to the radial direction of the main body portion. The buckle is located at one end of the light-shielding plate relatively far from the central axis of the main body portion. The buckle is fixedly connected to the light-shielding plate or is an integral part. The light-shielding plate abuts against the first circuit board. The central axis is the axis of the main body portion.

[0027] In this application, by arranging the buckle at one end of the light-shielding plate far from the central axis of the main body portion and connecting the optical path guide to the first circuit board by means of snap connection, the light-shielding plate is made to abut against the first circuit board, so that the light-shielding plate and the first circuit board cooperate, having a better light-shielding effect, further reducing the mutual interference between light sources, and contributing to improving the accuracy of the fluorescence dissolved oxygen sensor.

[0028] The second circuit board is provided with a tenon joint portion, and the first circuit board is provided with a tenon joint groove for tenon joint with the tenon joint portion. The second circuit board is tenon-jointed with the first circuit board, and the second circuit board is fixedly connected to the main housing.

[0029] In this application, by providing the second circuit board tenon-jointed with the first circuit board and fixedly connecting the second circuit board to the main housing, the fixation of the optical path guide, the first circuit board and the second circuit board to the main housing is completed, which helps to save costs and is beneficial to reducing the size of the sensor.

[0030] The tenon joint portion is further provided with a positioning boss for supporting the optoelectronic device and tilting the optoelectronic device.

[0031] In this application, by providing the tenon joint portion with a positioning boss, the support of the optoelectronic device is realized and it is tilted at a specific angle, so that the optoelectronic device does not need an additional structure for support, which helps to save costs.

[0032] The second circuit board is further provided with a relief groove for avoiding the buckle, and the relief groove is arranged at one end relatively close to the first circuit board.

[0033] In this application, by providing the relief groove for avoiding the buckle, the second circuit board is prevented from affecting the normal snapping of the buckle into the snap hole, which is convenient for the assembly of the fluorescence dissolved oxygen sensor.

[0034] Other features and advantages of this application will be disclosed in detail in the following specific embodiments and drawings. Description of the Drawings

[0035] Figure 1 is an axonometric view of the front structure of the optical path guide;

[0036] Figure 2 is a schematic diagram of the axis and central axis of the optical path guide;

[0037] Figure 3 is an axonometric view of the back structure of the optical path guide;

[0038] Figure 4 Schematic diagram of the connection between the optical path guide and the first circuit board;

[0039] Figure 5 Cross-sectional view of the connection between the optical path guide and the first circuit board;

[0040] Figure 6 Schematic diagram of the connection between the optical path guide, the first circuit board and the second circuit board;

[0041] Figure 7 Schematic diagram of the connection between the first circuit board and the second circuit board;

[0042] Figure 8 Schematic diagram of the overall structure of the fluorescence dissolved oxygen sensor;

[0043] Figure 9 Schematic diagram of the connection of the lens part structure;

[0044] Figure 10 Schematic diagram of the installation position of the optical path guide.

[0045] Explanation of the markings in the figure: 1. Optical path guide; 11. Main body part; 12. Buckle; 13. Light-shielding plate; 14. Mounting hole; 141. Optical path hole; 142. Accommodating hole; 15. Concave surface; 2. First circuit board; 21. Excitation light diode; 22. Reference light diode; 23. Photodiode; 24. Snap hole; 25. Tenon joint groove; 251. Positioning hole; 3. Second circuit board; 31. Relief groove; 32. Tenon joint part; 321. Positioning boss; 4. Main housing; 41. First thread; 42. Second thread; 43. Third thread; 44. Lead-out part; 5. Lens part; 51. Lens; 52. Fluorescent film; 6. Grille cylinder; 7. Cable. Detailed implementation manners

[0046] In order to better understand the purpose, structure and function of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings. In the present invention, unless otherwise clearly defined and limited, the terms "installation", "connection", "connection", "fixation" and other terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0047] Embodiment 1

[0048] An optical path guide 1, as shown in Figure 1 and Figure 2As shown, it includes a main body 11. The main body 11 includes a concave surface 15 and mounting holes 14, and there are at least two mounting holes 14; the axis O2 of the mounting hole 14 intersects with the central axis O1 of the main body 11 at a point, and the axis O2 of the mounting hole 14 intersects with the central axis O1 on the side of the main body where the concave surface is provided.

[0049] In this embodiment, there are three mounting holes 14, and a photodiode 23, an excitation light-emitting diode 21, and a reference light diode 22 are respectively arranged in the three mounting holes 14. The mounting holes 14 have the same size to accommodate any photodiode 23 or light-emitting diode, so that when installing this optical path guiding member, there is no specific corresponding relationship between the mounting holes 14 and the light-emitting diodes and photodiodes 23, which is convenient for installation.

[0050] As Figure 3 shown, the mounting hole 14 includes a receiving hole 142 for accommodating an optoelectronic device or a light-emitting light source and an optical path hole 141 for transmitting and receiving light; the optical path hole 141 is located at one end of the main body 11 relatively close to the concave surface 15, and the concave direction of the concave surface 15 is along the direction from the optical path hole 141 to the receiving hole 142; the aperture of the optical path hole 141 is smaller than the aperture of the receiving hole 142, and the axis of the optical path hole 141 coincides with the axis of the receiving hole 142. The transmitted light is the light emitted by the light-emitting light source, and the received light is the light received by the optoelectronic device.

[0051] In this application, by making the aperture of the optical path hole 141 smaller than the aperture of the receiving hole 142, the angle of the light emitted by the light-emitting light source is restricted, and the probability that the light emitted by the light-emitting light source is reflected by the inner wall of the mounting hole 14 to the optoelectronic device is reduced. At the same time, the surface of the main body 11 close to the optical path hole 141 is set as the concave surface 15 that is recessed into the main body 11, which cuts off the side close to the fluorescent film 52 of the fluorescence dissolved oxygen sensor after the optical path hole 141 is installed, and adjusts the shape of the optical path hole 141. Not only is the shielding of the optical path hole 141 from the emitted light reduced, the effective light passing hole aperture between the optical element and the fluorescent film 52 is increased, and the fluorescent film 52 receives more light emitted by the light-emitting light source; but also the probability that the light emitted by the light-emitting light source is reflected by the inner wall of the mounting hole 14 to the optoelectronic device is reduced, and the accuracy of the fluorescence dissolved oxygen sensor with the optical path guide 1 of this application is improved.

[0052] In this embodiment, the optoelectronic device can be a photodiode 23, and the light-emitting light source includes at least one excitation light source and at least one reference light source. The excitation light source is an excitation light-emitting diode 21, such as a blue light-emitting diode, and the reference light source is a reference light diode 22, such as a red light-emitting diode.

[0053] In this embodiment, the concave surface 15 serves as a reflecting surface for reflecting light away from the concave surface 15. Optionally, the concave surface 15 can be an arc surface or a conical surface to achieve the reflection of light away from the concave surface 15.

[0054] By providing a reflecting surface that reflects light towards the fluorescent film 52, this application further reduces the probability that the emitted light of the light-emitting source is reflected by the inner wall of the mounting hole 14 or the like to the optoelectronic device, which helps to improve the accuracy of the fluorescence dissolved oxygen sensor.

[0055] The mounting holes 14 are arranged in central symmetry, and the lowest point of the concave surface 15 is located at the middle position of the concave surface 15.

[0056] The concave surface 15 with the lowest point located in the middle in this application, in cooperation with the centrally symmetric mounting holes 14, makes the distance between the opening of the optical path hole 141 of each mounting hole 14 and the fluorescent film 52 after assembly the same, so that the concave surface 15 has a good reflection effect of reflecting light towards the fluorescent film 52, further reducing the probability that the emitted light of the light-emitting source is reflected by the inner wall of the mounting hole 14 or the like to the optoelectronic device, and improving the accuracy of the fluorescence dissolved oxygen sensor. At the same time, this structural design facilitates the preparation of the optical path guide 1 and saves the manufacturing cost.

[0057] At the same time, compared with the mounting holes 14 arranged in a straight line, by arranging several mounting holes 14 in central symmetry in this application, the angle between the axis of the mounting hole 14 where the light-emitting source is located and the axis of the mounting hole 14 where the optoelectronic device is located can be reduced, which is convenient for reducing the size of the optical path guide 1.

[0058] The optical path guide 1 further includes one or more light-shielding plates 13 provided between any two adjacent mounting holes 14; the light-shielding plates 13 are arranged on the main body portion 11, relatively close to the side of the receiving hole 142. In this embodiment, the number of the light-shielding plates 13 is the same as the number of the mounting holes 14, and the multiple light-shielding plates 13 and the multiple mounting holes 14 are arranged at intervals; to block the light emitted from the part of the light-emitting source that does not completely enter the mounting hole 14, thereby further reducing the mutual interference between the light sources and helping to improve the accuracy of the fluorescence dissolved oxygen sensor.

[0059] A fluorescence dissolved oxygen sensor, as Figures 4 to 7 shown, includes:

[0060] A main housing 4;

[0061] A lens unit, connected to the main housing 4, includes a lens portion 5, a lens 51 provided on the lens portion 5, and a fluorescent film 52 connected to the lens 51;

[0062] The optical path guide 1 is arranged inside the main housing 4; it includes a main body part 11, the main body part 11 includes a concave surface 15 and mounting holes 14, and there are at least two mounting holes 14; the axis O2 of the mounting hole 14 intersects with the central axis O1 of the main body part 11 at a point, and the axis O2 of the mounting hole 14 intersects with the central axis O1 on the side of the main body part where the concave surface is provided; the mounting hole 14 includes a receiving hole 142 for accommodating optoelectronic devices or light-emitting light sources and an optical path hole 141 for transmitting and receiving light rays; the optical path hole 141 is located at one end of the main body part 11 relatively close to the concave surface 15, and the aperture of the optical path hole 141 is smaller than the aperture of the receiving hole 142; the concave direction of the concave surface 15 is along the direction from the optical path hole 141 to the receiving hole 142;

[0063] The first circuit board 2 is arranged inside the main housing 4; optoelectronic devices and light-emitting light sources are arranged on the first circuit board 2, the optoelectronic devices and light-emitting light sources are both electrically connected to the first circuit board 2, the first circuit board 2 is connected to the optical path guide 1, and the optoelectronic devices and light-emitting light sources are located in the mounting holes 14;

[0064] The second circuit board 3 is arranged inside the main housing 4 and is electrically connected to the first circuit board 2.

[0065] In this application, by making the aperture of the optical path hole 141 of the optical path guide 1 smaller than the aperture of the receiving hole 142, the angle of the light emitted by the light-emitting light source is restricted, and the probability that the light emitted by the light-emitting light source is reflected by the inner wall of the mounting hole 14 or the like to the optoelectronic device is reduced. At the same time, the surface of the main body part 11 of the optical path guide 1 close to the optical path hole 141 is set as a concave surface 15 that is concave into the main body part 11, reducing the side of the optical path hole 141 close to the fluorescent film 52 of the fluorescence dissolved oxygen sensor after installation, and adjusting the shape of the optical path hole 141. This not only reduces the occlusion of the optical path hole 141 on the emitted light, increases the effective light passing hole aperture between the optical element and the fluorescent film 52, and enables the fluorescent film 52 to receive more light emitted by the light-emitting light source; but also reduces the probability that the light emitted by the light-emitting light source is reflected by the inner wall of the mounting hole 14 or the like to the optoelectronic device, improving the accuracy of the fluorescence dissolved oxygen sensor of this application.

[0066] The number of light-shielding plates 13 is the same as the number of mounting holes 14, and the multiple light-shielding plates 13 and the multiple mounting holes 14 are arranged at intervals; the light-shielding plates 13 are arranged on the side of the main body part 11 relatively close to the first circuit board 2 to block the light emitted by the part of the light-emitting light source that does not completely enter the mounting hole 14, so as to reduce the mutual interference between the light-emitting light sources and help improve the accuracy of the fluorescence dissolved oxygen sensor.

[0067] The main body part 11 is provided with a buckle 12, the first circuit board 2 is provided with a clamping hole 24 that cooperates with the buckle 12 for clamping, and the main body part 11 is clamped with the first circuit board 2.

[0068] In this application, a buckle 12 is provided on the main body 11, and a mating clamping hole 24 is provided on the first circuit board 2, so that the main body 11 can be connected and fixed to the circuit board to complete the fixation of the optical path guide 1 and the internal structure of the fluorescence dissolved oxygen sensor. No additional fixing structure is required, which helps to save costs and is conducive to reducing the size of the sensor. At the same time, the design of the buckle 12 makes the installation of the optical path guide 1 convenient, fast and reliable.

[0069] In this embodiment, a plurality of light shielding plates 13 are arranged in central symmetry about the central axis of the main body 11. The length direction of the light shielding plate 13 is parallel to the radial direction of the main body 11. The buckle 12 is located at one end of the light shielding plate relatively far from the central axis of the main body 11. The buckle 12 is fixedly connected to the light shielding plate 13 or is an integral part, and the light shielding plate 13 abuts against the first circuit board 2.

[0070] In this application, the buckle 12 is provided at one end of the light shielding plate 13 far from the central axis of the main body 11, and the optical path guide 1 is connected to the first circuit board 2 by a clamping method, so that the light shielding plate 13 abuts against the first circuit board 2, enabling the light shielding plate 13 and the first circuit board 2 to cooperate, having a better light shielding effect, further reducing the mutual interference between light sources, and helping to improve the accuracy of the fluorescence dissolved oxygen sensor. At the same time, setting the buckle 12 on the light shielding plate 13 facilitates the setting of the buckle 12 and is conducive to reducing the volume of the optical path guide 1.

[0071] As Figure 5 and Figure 6 shown, in this embodiment, the second circuit board 3 is provided with a tenon joint portion 32, and the first circuit board 2 is provided with a tenon joint groove 25 that cooperates with the tenon joint portion 32 for tenon joint. The second circuit board 3 is tenon jointed with the first circuit board 2, and the second circuit board 3 is fixedly connected to the main housing 4.

[0072] In this application, by providing a second circuit board 3 that is tenon jointed with the first circuit board 2 and fixedly connecting the second circuit board 3 to the main housing 4, the fixation of the optical path guide 1, the first circuit board 2 and the second circuit board 3 to the main housing 4 is completed, which helps to save costs and is conducive to reducing the size of the sensor.

[0073] Through holes for inserting and soldering the pins of the excitation light emitting diode 21 and the reference light diode 22 are formed on the first circuit board 2; positioning holes 251 for accommodating the pins of the photodiode 23 are also provided on the first circuit board 2. The positioning holes 251 are arranged beside the tenon joint groove 25. Optionally, the positioning holes 251 communicate with the tenon joint groove 25.

[0074] As Figure 7 shown, the tenon joint portion 32 is further provided with a positioning boss 321. The positioning boss 321 is an inclined protrusion for supporting the photodiode 23, so that the photodiode 23 is inclined at a specific angle, which provides convenience for installing the optical path guide 1.

[0075] A relief groove 31 for avoiding the buckle 12 is further provided on the second circuit board 3. The relief groove 31 is arranged at one end close to the first circuit board 2 to prevent the second circuit board 3 from affecting the normal insertion of the buckle 12 into the clamping hole 24, facilitating the assembly of the fluorescence dissolved oxygen sensor.

[0076] A fluorescence dissolved oxygen sensor disclosed in this embodiment further includes a cable 7. The cable 7 is connected to the main housing 4 and electrically connected to the second circuit board 3, and is used for routing the power line and the RS485 communication line. The cable 7 is fixed to the main housing 4 through the lead-out portion 44.

[0077] As Figure 9 shown, the lens portion 5 is connected to the main housing 4; a through hole having the same axis as the axis of the lens portion 5 is provided on the lens portion 5, and the lens 51 is arranged at the through hole. The lens 51 is used to prevent water leakage after the fluorescence film 52 is damaged, so as to protect the internal circuit board; the fluorescence film 52 is arranged on the side of the lens 51 away from the main housing 4 and is used to generate fluorescent substances under the irradiation of the excitation light and the reference light, which are detected by the photodiode 23.

[0078] A fluorescence dissolved oxygen sensor disclosed in this embodiment further includes a grille cylinder 6. The grille cylinder 6 is used to protect the fluorescence film and avoid the damage and attachment of sediment, animals or plankton to the membrane head during use.

[0079] As Figure 10 shown, the main housing 4 is provided with a first thread 41, a second thread 42 and a third thread 43. The main housing 4 is threadedly connected to the lens portion 5 through the first thread 41, threadedly connected to the grille cylinder 6 through the second thread 42, and threadedly connected to the external installation structure through the third thread 43.

[0080] The working process of the fluorescence dissolved oxygen sensor of this application is as follows: The blue light emitted by the excitation light diode 21 irradiates the fluorescent substance of the fluorescence film 52, exciting fluorescence, and oxygen reacts with the fluorescence to cause quenching. The photodiode 23 receives the fluorescence and detects the fluorescence lag phase. When the dissolved oxygen concentration is low, the fluorescence lifetime increases and the corresponding phase lag becomes larger. When the dissolved oxygen concentration is high, the fluorescence lifetime decreases and the corresponding phase lag becomes smaller. The reference light diode 22 emits red light as a reference for calibrating the lag, and then the dissolved oxygen concentration is obtained through calibration.

[0081] Embodiment 2

[0082] The difference between this embodiment and Embodiment 1 is that four mounting holes 14 are provided, and three light-emitting light sources and one photodiode 23, or two light-emitting light sources and two photodiodes 23, etc. are respectively arranged in the four mounting holes 14.

[0083] In the present application, several mounting holes 14 are arranged in a centrally symmetric distribution, and the number of mounting holes 14 can be set as required, which facilitates adding a photodiode 23, an excitation light-emitting diode 21, and / or a reference light diode 22, etc. in the optical path guide 1, improves the applicability of the optical path guide 1, and helps to improve the detection accuracy of the fluorescence dissolved oxygen sensor.

[0084] Embodiment III

[0085] The difference between this embodiment and Embodiment I is that there are two mounting holes 14, and a light-emitting light source and a photodiode 23 are respectively arranged in the two mounting holes 14. The light-emitting light source can emit both reference light and excitation light.

[0086] It can be understood that the present invention is described through some embodiments. As is known to those skilled in the art, without departing from the spirit and scope of the present invention, various changes or equivalent replacements can be made to these features and embodiments. Additionally, under the teaching of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of the present application belong to the scope protected by the present invention.

[0087] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An optical path director, characterized in that, It includes a main body portion, the main body portion includes a concave surface and mounting holes, and at least three mounting holes are provided; the axes of the mounting holes intersect with the central axis of the main body portion on the side of the main body portion where the concave surface is provided; the mounting holes include receiving holes for accommodating optoelectronic devices or light-emitting light sources and optical path holes for transmitting and receiving light; the optical path holes are located at the end of the main body portion relatively close to the concave surface, and the aperture of the optical path holes is smaller than the aperture of the receiving holes; the concave direction of the concave surface is from the optical path holes to the receiving holes. The mounting holes are arranged in central symmetry, and the lowest point of the concave surface is located at the middle position of the concave surface; the concave surface is an arc surface for reflecting light away from the concave surface.

2. The optical path director according to claim 1, wherein, It further includes light-shielding plates, the number of the light-shielding plates is the same as the number of the mounting holes, and the plurality of light-shielding plates and the plurality of mounting holes are arranged at intervals; the light-shielding plates are arranged on the side of the main body portion relatively close to the receiving holes.

3. A fluorescence dissolved oxygen sensor, characterized in that, It includes: A main housing; A lens unit, connected to the main housing, including a lens portion, a lens provided on the lens portion, and a fluorescent film connected to the lens; An optical path guide, provided in the main housing; the optical path guide includes a main body portion, the main body portion includes a concave surface and mounting holes, and at least three mounting holes are provided; the axes of the mounting holes intersect with the central axis of the main body portion on the side of the main body portion where the concave surface is provided; the mounting holes include receiving holes for accommodating optoelectronic devices or light-emitting light sources and optical path holes for transmitting and receiving light; the optical path holes are located at the end of the main body portion relatively close to the concave surface, and the aperture of the optical path holes is smaller than the aperture of the receiving holes; the concave direction of the concave surface is from the optical path holes to the receiving holes. A first circuit board, provided in the main housing; optoelectronic devices and light-emitting light sources are provided on the first circuit board, the optoelectronic devices and the light-emitting light sources are both electrically connected to the first circuit board, the first circuit board is connected to the optical path guide, and the optoelectronic devices and light-emitting light sources are located in the mounting holes; A second circuit board, provided in the main housing and electrically connected to the first circuit board; The mounting holes are arranged in central symmetry, and the lowest point of the concave surface is located at the middle position of the concave surface; the concave surface is an arc surface or a conical surface for reflecting light away from the concave surface.

4. The fluorescence dissolved oxygen sensor according to claim 3, characterized in that, The optical path guide includes light-shielding plates, the number of the light-shielding plates is the same as the number of the mounting holes, and the plurality of light-shielding plates and the plurality of mounting holes are arranged at intervals; the light-shielding plates are arranged on the side of the main body portion relatively close to the first circuit board.

5. The fluorescence dissolved oxygen sensor according to claim 4, characterized in that, The first circuit board is provided with snap holes, and the main body portion is provided with snaps for snap-connecting with the snap holes, and the main body portion is snap-connected to the first circuit board.

6. The fluorescence dissolved oxygen sensor according to claim 5, characterized in that, The multiple light-shielding plates are arranged in central symmetry about the central axis of the main body portion. The length direction of the light-shielding plate is parallel to the radial direction of the main body portion. The buckle is located at one end of the light-shielding plate relatively far from the central axis of the main body portion. The buckle is fixedly connected to the light-shielding plate or is an integral part. The light-shielding plate abuts against the first circuit board.

7. The fluorescence dissolved oxygen sensor according to any one of claims 3-6, characterized in that, The second circuit board is provided with a tenon joint portion, and the first circuit board is provided with a tenon joint groove for tenon-jointing with the tenon joint portion. The second circuit board is tenon-jointed with the first circuit board, and the second circuit board is fixedly connected to the main housing.

8. The fluorescence dissolved oxygen sensor according to claim 7, characterized in that, The tenon joint portion is further provided with a positioning boss, and the positioning boss is used for supporting the optoelectronic device and tilting the optoelectronic device.

9. The fluorescence dissolved oxygen sensor according to claim 5, wherein The second circuit board is provided with a relief groove for avoiding the buckle, and the relief groove is arranged at one end relatively close to the first circuit board.

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