High-transmittance industrial transmission optical fiber probe

Abstract

This utility model relates to the field of fiber optic sensing and detection technology, and discloses a high-transmittance industrial transmission fiber optic probe, including a main tube, the front end of which is fixedly connected to a flange; a detection end is provided on the rear end of the main tube, and a liquid detection groove is formed on the radial surface of the detection end. Lens 1 and Lens 2 are sealed and fixed on the two inner sides of the liquid detection groove. Lens 1 is connected to the incident fiber, and Lens 2 is connected to the outgoing fiber. By effectively eliminating the window, four transmission surfaces are reduced, thus effectively reducing optical path loss.

Description

Technical Field

[0001] This utility model relates to the field of fiber optic sensing and detection technology, and in particular to a high-transmittance industrial transmission fiber optic probe. Background Technology

[0002] An immersion transmission probe is a detection tool based on optical principles. Its core function is to measure the change in light intensity after it passes through a sample to infer information such as the concentration of the analyte. Industrial immersion transmission probes are widely used in many industrial fields, including chemical process monitoring, online water quality monitoring, pharmaceuticals, and bio-fermentation. They enable real-time monitoring and optimized control, helping to improve production efficiency and product quality.

[0003] Existing immersion transmission probes typically employ a radial slot at the end, with the entrance and exit points on either side of the slot. Liquid passes through the slot, and light passes through the liquid at the entrance point and is collected at the exit point for effective detection. Windows are placed at both the entrance and exit points. The optical path of the measurement light is as follows: guided by an optical fiber, it exits through a lens at the entrance, passes through the windows at the entrance and exit points, and is then received by the lens at the exit point and guided out through the optical fiber. This design results in four transmission surfaces as the measurement light passes through the two windows, leading to increased optical path loss. Utility Model Content

[0004] In view of the problem of optical path loss in the prior art, this utility model aims to provide a high transmittance industrial transmission fiber optic probe.

[0005] This utility model provides a high transmittance industrial transmission fiber optic probe, including a main tube, the front end of which is fixedly connected to a flange; a detection end is provided on the rear end of the main tube, and a liquid detection groove is formed on the radial surface of the detection end. Lens 1 and Lens 2 are sealed and fixed on the two inner sides of the liquid detection groove. Lens 1 is connected to the incident fiber, and Lens 2 is connected to the outgoing fiber.

[0006] Furthermore, the first lens and the incident optical fiber, as well as the second lens and the outgoing optical fiber, are all fused together as a single structure.

[0007] Furthermore, the detection end includes a tube body and a concave isolation block disposed within the tube body. The concave portion of the concave isolation block communicates with the outside and forms a liquid detection groove. The concave isolation blocks corresponding to lens one and lens two are provided with stepped through holes. Lens one and lens two are fixed to the corresponding stepped through holes by adhesive. One end of the tube body is also provided with an end cap, and the other end of the tube body is connected to the main tube.

[0008] Furthermore, it also includes:

[0009] Fixed sleeve one, which is fixedly connected to the inside of the flange;

[0010] A rotating head is rotatably connected to the front end of the fixed sleeve, and the interior of the rotating head is fixedly provided with an internal thread;

[0011] A first limiting sleeve is provided inside the fixed sleeve;

[0012] A first spring is provided inside the first limiting sleeve;

[0013] Sphere 1, which is fixedly connected to the front end of the first spring;

[0014] Fixed sleeve two, the outer wall of the front end of the fixed sleeve two is fixedly connected with an external thread, and the external thread is threadedly connected with the internal thread;

[0015] A second spring is provided inside the fixed sleeve 2;

[0016] Sphere two, which is fixedly connected to the front end of the second spring;

[0017] A push column, which is connected to the front end of the second sphere;

[0018] The pusher pin is used to push the ball to compress the first spring to generate a preload force during the engagement of the external thread and the internal thread.

[0019] Furthermore, a second limiting sleeve is also fixedly connected inside the second fixing sleeve, which is used to limit the inner bottom of the second spring.

[0020] Furthermore, it also includes a protective sleeve and a clamp. The protective sleeve is fitted over the outside of the main tube, and the front end of the protective sleeve is fixedly fitted onto the surface of the main tube by the clamp.

[0021] Furthermore, it also includes a fixed plate and a hollow threaded column. The front end of the flange is fixedly connected to the fixed plate, and the front end of the fixed plate is fixedly connected to the hollow threaded column. The hollow threaded column is provided with an inlet and an outlet.

[0022] Furthermore, the fixing sleeve is fixedly connected to the internal groove of the flange.

[0023] Furthermore, the first limiting sleeve is fixedly connected to the inner rear end of the first fixing sleeve.

[0024] This utility model has the following beneficial effects:

[0025] 1. This utility model solves the problems of excessive optical interfaces, large light loss, and low transmittance in the optical path caused by the use of optical windows in the prior art by removing the optical window at the end of the probe and replacing it with a lens. It achieves the effects of reducing light reflection and scattering, significantly improving light transmittance, and enhancing signal strength.

[0026] 2. This utility model, by setting a fixed sleeve, a rotating head and an internal spring pre-tightening mechanism, uses the elastic deformation of the spring to generate pre-tightening force when the components are screwed together, which solves the problem of loosening of the internal threaded connection of the probe in the industrial vibration environment in the prior art, and achieves the effect of making the internal structure of the probe tightly connected, with strong vibration resistance and long-term stability.

[0027] 3. This utility model, by adopting an installation structure that combines a flange, a fixed plate, and a threaded column, and by setting a protective sleeve and clamps on the outside of the main tube, solves the problems of inconvenient installation and positioning of probes in industrial sites or insufficient protection capabilities in the prior art, achieving the effect of firm installation, accurate positioning, and effective protection for the probe main tube. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0029] Figure 2 This is a schematic diagram of the cross-sectional structure of the detection end of this utility model;

[0030] Figure 3 This is a schematic diagram of the overall structure of the present invention with a protective structure;

[0031] Figure 4 This utility model Figure 3 The front view;

[0032] Figure 5 This is an exploded view of the fixing sleeve of this utility model;

[0033] Figure 6 This is a sectional view of the fixing sleeve 2 of this utility model;

[0034] Figure 7 This utility model Figure 3 Cross-sectional view of the main tube. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0036] Example:

[0037] Please refer to Figure 1 and Figure 2 As shown, this utility model embodiment provides a high-transmittance industrial transmission fiber optic probe, which aims to solve the problem of low light transmittance in the prior art. The specific structure includes a main tube 1, the front end of which is fixedly connected to a flange 2. A detection end 111 is provided on the rear end of the main tube 1. A liquid detection groove 112 is formed on the radial surface of the detection end 112. Lens 1 20 and Lens 2 21 are sealed and fixed on the two inner sides of the liquid detection groove 112. Lens 1 20 is connected to the incident fiber 113, and Lens 2 21 is connected to the outgoing fiber 114. Lens 1 20 and Lens 2 21 are necessary structures, omitting the window in the prior art and directly replacing it with Lens 1 20 and Lens 2 21. Therefore, the four surfaces on the two window pieces are eliminated, reducing four transmission surfaces and effectively reducing optical path loss. Through effective calculation, the transmittance of the entire system can be increased by 40%-50%.

[0038] Specifically, light enters through incident fiber 113, then passes directly through lens 1 20 and is directed parallel to lens 2 21. Lens 2 21 receives the light and then transmits it out through exiting fiber 114. Both light emission and reception are accomplished by corresponding devices. (Refer to...) Figure 2 As shown, the outgoing fiber 114 is straight, while the incoming fiber 113 needs to be bent before connecting to lens 20. At this point, the fiber with the appropriate bending radius can be selected based on the space available at the detection end 111. Generally, a smaller bending radius should be chosen to avoid breakage during installation. Since the incoming fiber 113 is directly connected to lens 20, light loss can be further reduced. Based on this, the aforementioned lens 20 and the incoming fiber 113, as well as lens 21 and the outgoing fiber 114, are all fused together into a single structure. The two light-transmitting surfaces of lens 20 and the incoming fiber 113, and the two light-transmitting surfaces of lens 21 and the outgoing fiber 114, are omitted, further reducing the number of light-transmitting surfaces and improving transmission efficiency.

[0039] The aforementioned detection end includes a tube body 115 and a concave isolation block 116 disposed within the tube body. The concave portion of the concave isolation block 116 communicates with the outside and forms a liquid detection groove 112. The concave isolation blocks corresponding to lenses 20 and 21 are provided with stepped through holes. Lenses 20 and 21 are fixed to their corresponding stepped through holes with adhesive. One end of the tube body 115 is also provided with an end cap 117, and the other end of the tube body 115 is connected to the main tube 1. The aforementioned concave isolation block 116 is used to block external liquid from entering the internal space of the tube body 115. It can be manufactured using machining methods such as turning. The stepped through holes on the concave isolation block 116 are blocked by lenses 20 and 21, ensuring light transmission while providing a sealed structure. The stepped through holes facilitate accurate lens installation.

[0040] Of course, in situations where space is limited, the incident fiber 113 may not meet the bending requirements. In such cases, a set of reflectors can be used for reflection. The incident ray 113 and the outgoing fiber 114 are arranged in the same direction. The light exits from the incident ray 113 onto the first reflector (i.e., exits along the first X-axis). Reflected by the first reflector, the light is directed along the Y-axis to the second reflector, which then reflects it back to lens 20 (i.e., exits along the second X-axis). This method can also meet the usage requirements.

[0041] In use, the detection tip is directly immersed in the liquid. When the liquid passes through the liquid detection tank, the detection can be performed. The detection principle is existing technology and will not be described in detail.

[0042] In one embodiment, this application also provides a solution to the problem of probe connections becoming loose when products are used in industrial vibration environments in the prior art.

[0043] Please refer to Figure 3 and Figure 4 The high-transmittance industrial transmission fiber optic probe mentioned above also includes a fixed plate 3 and a threaded post 4. The front end of the main tube 1 is fixedly connected to the flange 2, the front end of the flange 2 is fixedly connected to the fixed plate 3, and the front end of the fixed plate 3 is fixedly connected to the threaded post 4. The flange 2, the fixed plate 3, and the threaded post 4 together constitute the mounting assembly.

[0044] Please refer to Figure 3 , Figure 5 and Figure 6A fixing sleeve 7 is fixedly connected inside the groove of flange 2. A first limiting sleeve 10 is fixedly connected to the inner rear end of the fixing sleeve 7. The first limiting sleeve 10 is used to limit the inner bottom of the first spring 11. A ball 12 is fixedly connected to the front end of the first spring 11 located inside the first limiting sleeve 10. A rotating head 8 is rotatably connected to the front end of the fixing sleeve 7. An internal thread 9 is fixedly provided inside the rotating head 8. The high transmittance industrial transmission fiber optic probe also includes a fixing sleeve 2 13. An external thread 14 is fixedly connected to the outer wall of the front end of the fixing sleeve 2 13. The second sleeve 10 is also fixedly connected to the inner thread 9 of the fixed sleeve 2 13. The second limiting sleeve 10 is used to limit the inner bottom of the second spring 11. The front end of the second spring 11 located inside the fixed sleeve 2 13 is fixedly connected to the ball 2 17. The front end of the ball 2 17 is connected to the push post 15. During the installation process, the outer thread 14 of the fixed sleeve 2 13 is screwed into the inner thread 9 of the rotating head 8. The push post 15 pushes the ball 12. The ball 12 compresses the first spring 11 backward to generate a preload force. The preload force acts on the threaded connection between the outer thread 14 and the inner thread 9.

[0045] Please refer to Figure 3 , Figure 4 and Figure 7 The front end of the main tube 1 is fixedly connected to the flange 2. The front side of the threaded column 4 is fixedly connected to the inlet 18 and the outlet 19. The inlet 18 and the outlet 19 are the direction of entry and exit of the optical fiber. At the same time, the high transmittance industrial transmission fiber optic probe also includes a protective sleeve 5 and a clamp 6. The protective sleeve 5 is fitted on the outside of the main tube 1. The front end of the protective sleeve 5 is fixedly fitted on the surface of the main tube 1 by the clamp 6. This outer protective structure ensures effective protection for the main tube 1. For the fixing plate 3 and the threaded column 4 used to install and fix the overall probe to the device to be tested, the front end of the flange 2 is fixedly connected to the fixing plate 3, and the front end of the fixing plate 3 is fixedly connected to the threaded column 4. The flange 2, the fixing plate 3, and the threaded column 4 work together to securely install and position the main tube 1.

[0046] In a preferred embodiment, to achieve more precise coaxiality and fixation, the fixing sleeve 7 is fixedly connected to the internal groove of the flange 2.

[0047] As another preferred embodiment, in order to provide stable axial support for the first spring 11, the first limiting sleeve 10 is fixedly connected to the inner rear end of the fixed sleeve 7.

[0048] In another preferred embodiment, in order to provide stable axial support for the second spring 11, a second limiting sleeve 10 is also fixedly connected inside the second fixing sleeve 13. The second limiting sleeve 10 is used to limit the inner bottom of the second spring 11.

[0049] Working principle:

[0050] During assembly or connection, the external thread 14 of the fixed sleeve 2 13 is screwed into the internal thread 9 inside the rotating head 8. During this process, the push post 15 at the front end of the fixed sleeve 2 13 pushes the ball 12 inside the fixed sleeve 1 7 forward, and the ball 12 compresses the first spring 11 backward. After the rotating head 8 is rotated so that the internal thread 9 and the external thread 14 are fully engaged, the first spring 11 remains in a compressed state, thereby generating a stable preload. The preload acts firmly on the threaded connection between the external thread 14 and the internal thread 9, thus solving the problem of loosening of the connection under industrial vibration environment.

[0051] In terms of optical detection, the main tube 1 is first placed in the liquid. When the light output from the optical fiber shines through lens 20 into the liquid in the liquid detection tank 112, the light is received by lens 21 after passing through the liquid and transmitted back to the equipment through the optical fiber to obtain real-time detection signal data for detection and analysis. In terms of installation and protection, flange 2, fixing plate 3, and threaded post 4 work together to fix the main tube 1 to the device to be tested. Protective sleeve 5 is fitted over the outside of the main tube 1 and fixed by clamp 6 to form protection for the main tube 1.

Claims

1. A high-transmittance industrial transmission fiber optic probe, characterized in that, The device includes a main tube, the front end of which is fixedly connected to a flange; a detection end is provided on the rear end of the main tube, and a liquid detection groove is formed on the radial surface of the detection end. Lens 1 and Lens 2 are sealed and fixed on the two inner sides of the liquid detection groove. Lens 1 is connected to the incident optical fiber, and Lens 2 is connected to the outgoing optical fiber.

2. The high transmittance industrial transmission fiber optic probe according to claim 1, characterized in that, The lens one and the incident optical fiber, as well as the lens two and the output optical fiber, are all fused together as a single structure.

3. A high-transmissivity industrial transmission optical fiber probe according to claim 1, characterized in that, The detection end includes a tube body and a concave isolation block disposed within the tube body. The concave portion of the concave isolation block is in communication with the outside and forms a liquid detection groove. The concave isolation blocks corresponding to lens one and lens two are provided with stepped through holes. Lens one and lens two are fixed to the corresponding stepped through holes by adhesive. One end of the tube body is also provided with an end cap, and the other end of the tube body is connected to the main tube.

4. The high transmittance industrial transmission fiber optic probe according to claim 1, characterized in that, Also includes: Fixed sleeve one, which is fixedly connected to the inside of the flange; A rotating head is rotatably connected to the front end of the fixed sleeve, and the interior of the rotating head is fixedly provided with an internal thread; A first limiting sleeve is provided inside the fixed sleeve; A first spring is provided inside the first limiting sleeve; Sphere 1, which is fixedly connected to the front end of the first spring; Fixed sleeve two, the outer wall of the front end of the fixed sleeve two is fixedly connected with an external thread, and the external thread is threadedly connected with the internal thread; A second spring is provided inside the fixed sleeve 2; Sphere two, which is fixedly connected to the front end of the second spring; A push column, which is connected to the front end of the second sphere; The pusher pin is used to push the ball to compress the first spring to generate a preload force during the engagement of the external thread and the internal thread.

5. A high-transmittance industrial transmission fiber optic probe according to claim 4, characterized in that, The second fixing sleeve is also fixedly connected to the inside of the second fixing sleeve. The second fixing sleeve is used to limit the inner bottom of the second spring.

6. A high-transmittance industrial transmission fiber optic probe according to claim 3, characterized in that, It also includes a protective sleeve and a clamp. The protective sleeve is fitted over the outside of the main tube, and the front end of the protective sleeve is fixedly fitted onto the surface of the main tube by the clamp.

7. A high-transmittance industrial transmission fiber optic probe according to claim 3, characterized in that, It also includes a fixed plate and a hollow threaded column. The front end of the flange is fixedly connected to the fixed plate, and the front end of the fixed plate is fixedly connected to the hollow threaded column. The hollow threaded column is provided with an inlet and an outlet.

8. A high-transmittance industrial transmission fiber optic probe according to claim 4, characterized in that, The fixing sleeve is fixedly connected to the internal groove of the flange.

9. A high-transmittance industrial transmission fiber optic probe according to claim 4, characterized in that, The first limiting sleeve is fixedly connected to the inner rear end of the first fixing sleeve.

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