Passive device temperature measurement light path feedback device and feedback method

Abstract

The invention belongs to the technical field of optical fiber temperature measurement, and discloses a passive device temperature measurement light path feedback device and a feedback method, which can perform light detection on whether a passive device temperature measurement light path optical fiber is abnormally interrupted or not, can block incidence of ambient light through a shell assembly with a closed light transmission channel, improves the accuracy of detection feedback, and improves the detection accuracy of the passive device temperature measurement light path. The light output by the optical fiber can be subjected to diffuse reflection through the inner wall of the channel subjected to texturing treatment, the light can be detected by a light sensing device, the response speed is increased, the light intensity of the light subjected to diffuse reflection is reduced, the problem that the light sensing device is burnt down due to direct incidence of high-power light can be avoided, and the service life of the light sensing device is prolonged. And meanwhile, the light emitted by the optical fiber is propagated in the light propagation channel in a diffuse reflection manner, so that the requirement on the notch of the section of the end part of the optical fiber is not high, the process requirement is reduced, and the time is saved.

Description

Technical Field

[0001] The present invention belongs to the technical field of optical fiber temperature measurement, and in particular relates to a passive device temperature measurement optical path feedback device and a feedback method. Background Art

[0002] Passive components in fiber optic technology are fundamental elements that require no external power and process optical signals solely through optical principles. They perform key functions in optical communication systems, including connection, distribution, isolation, and filtering, and are core components in building fiber optic networks.

[0003] During the automatic temperature measurement of passive devices, defects in optical fibers and passive components may cause the optical path to burn or explode, and a feedback device is needed to check whether the optical path is abnormally interrupted. In the existing technology, there are two main solutions to achieve optical fiber signal feedback. One solution is to pass strong light through the optical fiber. The PD (photoelectric conversion sensor) sensing head is placed above the optical fiber, and the light leakage through the optical fiber cladding is used to check whether there is light in the optical fiber. The analog signal is used for other systems, such as Figure 1 As shown, this solution requires a high-power light to achieve PD response due to the low light leakage rate of the optical fiber cladding, which cannot meet the requirements of inspecting the light inside the optical fiber after it has been stripped by the CPS (cladding stripper). Another solution is to cut the optical fiber end flush and point it toward the filter. The light attenuated by the filter is projected onto the photoelectric sensor, and the power meter converts the signal into a digital signal through AD for use by other systems, such as Figure 2 As shown, this solution requires the fiber outlet section to be cut flush to ensure that the light hits the filter and is transmitted to the internal photoelectric sensor head. Since the outside is open, it is easily affected by ambient light when measuring the weak light after CPS stripping. If a photothermal power meter is used, due to thermal inertia, the feedback will be relatively delayed if the external light path is abnormal. Summary of the Invention

[0004] In view of this, an object of the present invention is to provide a passive device temperature measurement optical path feedback device and feedback method to solve the problems that the existing feedback device is easily affected by ambient light and has a slow feedback speed.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] In one aspect, a passive device temperature measurement optical path feedback device is provided, comprising:

[0007] A housing assembly having a closed light propagation channel, wherein the inner wall of the light propagation channel is roughened, and the housing assembly is provided with an insertion port for inserting an optical fiber of a passive component into the light propagation channel from a proximal end; and

[0008] A light sensing device is provided on the housing assembly, the light sensing device is located at the far end of the light propagation channel, and a probe of the light sensing device penetrates into the housing assembly;

[0009] The light emitted from the optical fiber is diffusely reflected by the inner wall of the light propagation channel treated with roughening, and the diffusely reflected light is sensed by the optical sensing device and converted into an electrical signal for feedback.

[0010] In a possible implementation, the light propagation channel includes a positioning channel section and a detection channel section arranged along the proximal to distal direction of the light transmission channel, the positioning channel section and the detection channel section are separated by a transparent partition, and the insertion port is arranged at the end of the positioning channel section opposite to the partition.

[0011] In a possible implementation, the probe of the light sensing device senses from the peripheral side of the light propagation channel, and the distance between the light sensing device and the partition in the axial direction is adjustable to meet the sensing requirements of different light intensities.

[0012] In a possible implementation, the shell assembly includes a metal shell and a channel component arranged in the metal shell, the channel component is made of quartz, the channel component forms the light propagation channel in the metal shell, and the channel component cooperates with the metal shell to form a heat transfer structure for conducting heat outward.

[0013] In a possible implementation, the light sensing device is disposed on a metal housing, and a probe of the light sensing device passes through the metal housing and is located outside the channel component, so that the light sensing device senses diffusely reflected light from outside the channel component.

[0014] In a possible implementation, the channel member includes a groove member and a cover plate, the groove member passes through two opposite sides of the light propagation channel in the axial direction, the cover plate is provided on the groove member, and the metal shell seals the two sides of the channel member to form the light propagation channel;

[0015] And / or, the metal shell includes a groove-shaped shell and a cover provided on the groove-shaped shell, and the cover is provided with a mounting hole for the probe of the light sensing device to penetrate.

[0016] In a possible implementation, an attenuation plate is provided between the probe of the optical sensing device and the channel component, and / or a heat exchange device is provided on the outside of the housing assembly.

[0017] In a possible implementation, the passive component further includes a cladding light stripper, and the optical fiber is inserted into the light propagation channel of the housing assembly after passing through the cladding light stripper.

[0018] In a possible implementation, the end face of the optical fiber inserted into the light propagation channel is not cut flush.

[0019] On the other hand, a passive device temperature measurement optical path feedback method is also provided, comprising the following steps:

[0020] A housing assembly having a closed light propagation channel is provided, wherein the inner wall of the light propagation channel is roughened, and a light sensing device is provided on the housing assembly, the light sensing device is located at the far end of the light propagation channel, and a probe of the light sensing device penetrates into the housing assembly and is located at the far end of the light propagation channel;

[0021] inserting the optical fiber of the passive component into the proximal end of the light propagation channel of the housing assembly;

[0022] The light emitted from the optical fiber forms diffusely reflected light after passing through the roughened channel wall in the light propagation channel. The diffusely reflected light is sensed by the optical sensing device and converted into an electrical signal for feedback.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The passive device temperature measurement optical path feedback device and feedback method of the present invention can perform optical detection on whether the optical fiber of the passive device temperature measurement optical path is abnormally interrupted. The shell assembly with a closed optical transmission channel can block the incidence of ambient light, improve the accuracy of detection feedback, and facilitate the formation of a closed optical transmission channel. The light output by the optical fiber can be diffusely reflected by the roughened inner wall of the channel, which is beneficial for the detection of the optical sensing device and improves the response speed, and also reduces the light intensity of the light after diffuse reflection, thereby avoiding the problem of high-power light directly irradiating the optical sensing device and causing it to burn. At the same time, since the light emitted by the optical fiber is propagated by diffuse reflection in the optical transmission channel, the requirements for the incision of the optical fiber end section are not high, which reduces the process requirements and saves time.

[0025] Moreover, the positioning channel section can not only position and limit the depth of optical fiber insertion by the partition, but also make the light emitted by the optical fiber pass through the positioning channel section through the partition and into the detection channel section for diffuse reflection through the positioning channel section and the detection channel section, so that the light distribution of the optical fiber is gradually decreasing from the partition to the far end of the light propagation channel, and can be adapted to passive devices of different powers by changing the distance between the partition and the light sensing device. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural diagram of an existing optical path feedback device;

[0027] Figure 2 It is a structural diagram of another existing optical path feedback device;

[0028] Figure 3 This is a schematic diagram of the structure of a passive device temperature measurement optical path feedback device;

[0029] Figure 4This is a schematic diagram of the structure of a passive device temperature measurement optical path feedback device after the attenuation plate and heat exchange device are set.

[0030] In the figure: 1-shell assembly; 11-cover; 12-grooved housing; 2-light sensing device; 3-channel component; 4-light propagation channel; 41-detection channel section; 42-positioning channel section; 5-partition; 6-optical fiber; 7-cladding light stripper; 8-heat exchange device; 9-attenuation plate. DETAILED DESCRIPTION

[0031] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with specific implementation methods.

[0032] Combine Figure 3 and Figure 4 As shown, an embodiment of the present application provides a passive device temperature measurement optical path feedback device, comprising: a shell component 1 having a closed light propagation channel 4, the inner wall of the light propagation channel 4 being roughened, and the shell component 1 being provided with an insertion port for inserting the optical fiber 6 of the passive device into the light propagation channel 4 from the proximal end; and a light sensing device 2 provided on the shell component 1, the light sensing device 2 being at the distal end of the light propagation channel 4, and the probe of the light sensing device 2 being inserted into the shell component 1; wherein, the light emitted by the optical fiber 6 forms diffusely reflected light through the roughened inner wall of the light propagation channel 4, and the diffusely reflected light is sensed by the light sensing device 2 and converted into an electrical signal for feedback.

[0033] The housing assembly 1 forms a closed optical transmission channel 4, which also helps block the entry of ambient light, providing a favorable and stable detection environment for the optical sensor 2, thereby enhancing the accuracy of detection and feedback. The inner wall of the optical transmission channel 4 within the housing assembly 1 is roughened, allowing light from the optical fiber 6 to be diffusely reflected upon entering the optical transmission channel 4. This diffusely reflected light forms a light field distribution with decreasing intensity from the proximal end of the optical fiber 6 to the distal end of the optical transmission channel 4. By inserting the probe of the optical sensor 2 into the housing assembly 1, detection within the light field is performed. This facilitates light intensity sensing. Furthermore, by varying the distance between the optical sensor 2 and the optical fiber 6, sensing of varying light intensities can be achieved. Furthermore, by sensing diffusely reflected light, direct light exposure can be avoided, potentially leading to burns in the optical sensor 2. Since the light emitted by the optical fiber 6 is diffusely reflected within the optical transmission channel 4, there are no specific requirements for the cutout of the optical fiber 6 end; it is sufficient to ensure that the light enters the optical transmission channel 4. This avoids the need for flat-cutting the end section of the optical fiber 6, saving time.

[0034] Through the above technical solution, it is possible to perform optical detection on whether the optical fiber 6 of the temperature measurement optical path of the passive device is abnormally interrupted. The shell assembly 1 with a closed optical transmission channel can block the incidence of ambient light, improve the accuracy of detection feedback, and facilitate the formation of a closed optical transmission channel. The light output by the optical fiber 6 can be diffusely reflected by the roughened inner wall of the channel, which is beneficial for the light sensing device 2 to detect and improve the response speed, and also reduces the light intensity of the light after diffuse reflection, so as to avoid the problem of high-power light directly causing the light sensing device 2 to be burned. At the same time, since the light emitted by the optical fiber 6 is propagated by diffuse reflection in the optical propagation channel 4, the requirements for the incision of the end section of the optical fiber 6 are not high, which reduces the process requirements and saves time.

[0035] In one embodiment, the light propagation channel 4 includes a positioning channel section 42 and a detection channel section 41 arranged along the proximal to distal direction of the light transmission channel. The positioning channel section 42 and the detection channel section 41 are separated by a transparent partition 5, and the insertion port is provided at the end of the positioning channel section 42 opposite to the partition 5.

[0036] The light propagation channel 4 is divided by the partition 5 and separated into a positioning channel section 42 and a detection channel section 41. The positioning channel section 42 can limit the insertion depth of the optical fiber 6 through the partition 5, and block the optical fiber 6 when it reaches the extreme position or preset position in the positioning channel section 42, so that the inserted optical fiber 6 can be conveniently positioned. The light injected by the optical fiber 6 is incident into the detection channel section 41 through the transparent partition 5 and diffusely reflected, and forms a light field distribution in the detection channel section 41 with the light intensity gradually decreasing from the partition 5 to the end of the detection channel section 41.

[0037] In order to facilitate sensing of different light intensities, further, the probe of the light sensing device 2 senses from the peripheral side of the light propagation channel 4, and the axial distance between the light sensing device 2 and the partition 5 is adjustable to meet the sensing requirements of different light intensities.

[0038] In this way, by forming a light field distribution in which the light intensity gradually decreases from the partition 5 to the end of the detection channel section 41 in the detection channel section 41, the light sensing device 2 can be installed at different axial circumferential positions of the detection channel section 41, such as the near end or the far end, according to the different light intensities, which is more convenient for position adjustment. This not only facilitates the sensing of light of different light intensities, but also further reduces the risk of burning the light sensing device 2 due to direct exposure to higher-power light.

[0039] During the specific implementation process, the adjustable distance between the light sensing device 2 and the partition 5 can be achieved in a variety of ways. For example, a plurality of mounting positions distributed along the direction of the light propagation channel 4 are set on the shell component 1, and each mounting position is equipped with a detachable blocking block. When it is necessary to sense light of a certain light intensity level, the light sensing device 2 is installed at the mounting position at the corresponding position to adjust the distance between it and the partition 5, and the remaining mounting positions are blocked by the blocking block; for example, the shell component 1 can be provided with a cover plate, and a mounting port for the light sensing device 2 is provided on the cover plate. When it is necessary to adjust the distance between the light sensing device 2 and the partition 5, the cover plates of the mounting ports at different positions can be replaced, and then the light sensing device 2 can be installed at the mounting ports at different positions.

[0040] In a preferred embodiment of the shell assembly 1, the shell assembly 1 includes a metal shell and a channel component 3 arranged in the metal shell, the channel component 3 is made of quartz material, the channel component 3 forms the light propagation channel 4 in the metal shell, and the channel component cooperates with the metal shell to form a heat transfer structure for conducting heat outward.

[0041] The metal shell is a commonly used metal material with good thermal conductivity, such as copper, iron, aluminum, and alloy materials. This type of metal material has good heat conduction effect while being opaque. In combination with the quartz channel member 3, it can form an excellent heat transfer structure that can be used to conduct heat outward, thereby improving the heat dissipation performance of the shell assembly 1. The quartz channel member 3 is resistant to local high temperatures and can guide light, which is conducive to the outward transmission of light and heat generated by diffusely reflected light. In addition, the diffusely reflected light in the light propagation channel 4 can be diffusely reflected again by the metal shell after passing through the channel member 3, which is more conducive to forming a light field distribution with decreasing light intensity. Preferably, the metal shell is an aluminum alloy shell, which has good heat dissipation, is flame retardant, and has low cost.

[0042] On this basis, the light sensing device 2 is mounted on the metal housing, with its probe extending through the metal housing and positioned outside the channel member 3, allowing the light sensing device 2 to sense diffusely reflected light from outside the channel member 3. The light sensing device 2 is mounted on the circumference of the metal housing, with its probe extending through the metal housing. Because the channel member 3 guides light, the light sensing device 2 can sense light from outside the channel member 3, further reducing the risk of high-intensity light irradiating the probe.

[0043] To facilitate assembly and disassembly of the housing assembly 1, in a specific implementation, the channel member 3 may include a groove-shaped member and a cover plate. The groove-shaped member extends through two opposite sides of the light propagation channel 4 in the axial direction. The cover plate is provided on the groove-shaped member. The metal shell closes the two sides of the channel member 3 to form the light propagation channel 4. The groove-shaped member, which extends through both sides, is placed in the metal shell to form a groove-shaped cavity extending in the axial direction. After the cover plate closes the cavity, it can serve as the light propagation channel 4. This facilitates assembly and disassembly of the light propagation channel 4. The cover plate can be fixedly connected to the groove-shaped member by glue.

[0044] In addition, the metal shell can also be made into a split structure for easy disassembly and assembly. The metal shell can include a groove-shaped shell 12 and a cover 11 provided on the groove-shaped shell 12. The cover 11 is provided with a mounting hole for the probe of the light sensing device 2 to penetrate.

[0045] In order to facilitate the application of high-power light, an attenuation plate 9 is provided between the probe of the light sensing device 2 and the channel component 3 , and / or a heat exchange device 8 is provided on the outside of the housing assembly 1 .

[0046] When the light emitted by optical fiber 6 is high-power, the intensity of the diffusely reflected light after diffuse reflection is also relatively high. To prevent direct or prolonged exposure to the light sensing device 2 probe, which could burn it, an attenuation plate 9 can be installed between the probe and channel member 3. This attenuation plate 9 reduces the intensity of the light sensed by the probe, thereby providing some protection for the probe. Furthermore, to dissipate heat transferred from the metal housing, a heat exchanger 8, through which a medium such as coolant or cooling air can be passed, can be installed on the outside of the metal housing to remove heat from the metal housing, thereby reducing and stabilizing the operating temperature of the entire feedback system.

[0047] In one application scenario, the passive device further includes a cladding light stripper 7 , and the optical fiber 6 is inserted into the light propagation channel 4 of the housing assembly 1 after passing through the cladding light stripper 7 .

[0048] The optical fiber 6 in the temperature measurement optical path of the passive device needs to strip the cladding light. After the cladding light is stripped, it becomes weak-power light (no more than a few mW). By propagating in a diffuse reflection manner in the closed optical propagation channel 4, the optical sensing device 2 can be more easily sensed and respond faster, and convert the weak-power light into a proportional analog electrical signal to provide feedback to external equipment.

[0049] Specifically, the end face of the optical fiber 6 inserted into the light propagation channel 4 is not cut flush. The uneven end face of the optical fiber 6 allows the light emitted by the optical fiber 6 to be emitted earlier from the channel wall of the light propagation channel 4 and trigger diffuse reflection, thereby avoiding the problem of high process requirements and time consumption caused by the need for cutting.

[0050] It can be understood that the propagation mode of light in the optical propagation channel 4 of the embodiment of the present application is similar to the propagation of a point light source in a tunnel. The light intensity of the tunnel wall = direct irradiation contribution + multiple reflection contribution. When the optical fiber 6 output power is the same, the closer the installation distance, the greater the light intensity of the tunnel wall, and the more suitable it is for the optical fiber 6 with low light intensity to sense feedback. When the installation distance is constant, the light intensity (light power per unit area) is positively correlated with the total power of the point light source. Since the light intensity is positively correlated with the total power of the light source, the digital-to-analog conversion value V p is positively correlated with light intensity, so V p It is positively correlated with the total power of the light source. Therefore, through relevant calculations and actual experiments, the input power P value can be obtained, and the light input can be fed back at the same time.

[0051] The embodiment of the present application further provides a passive device temperature measurement optical path feedback method, comprising the following steps:

[0052] Step S1: providing a housing assembly 1 having a closed light propagation channel 4, wherein the inner wall of the light propagation channel 4 is roughened, and providing a light sensing device 2 on the housing assembly 1, the light sensing device 2 being located at the distal end of the light propagation channel 4, and a probe of the light sensing device 2 penetrating into the housing assembly 1 and being located at the distal end of the light propagation channel 4;

[0053] Step S2: inserting the optical fiber 6 of the passive device into the proximal end of the light propagation channel 4 of the housing assembly 1;

[0054] Step S3: The light emitted from the optical fiber 6 forms diffusely reflected light after passing through the roughened channel wall in the light propagation channel 4. The diffusely reflected light is sensed by the optical sensing device 2 and converted into an electrical signal for feedback.

[0055] The above-mentioned feedback method is based on the above-mentioned passive device temperature measurement optical path feedback device. The passive device testing process requires feedback judgment of the optical path. The light field gradient is distributed in the length direction through tunnel-type diffuse reflection, and then a photoelectric sensor (PD) is used as the light sensing device 2 to test the intensity of light, thereby judging whether there is light (a certain light intensity) in the optical fiber 6. It is more suitable for scenarios with weak light intensity and rapid response.

[0056] The above are merely preferred embodiments of the present invention. It should be noted that the above preferred embodiments should not be construed as limiting the present invention, and the scope of protection of the present invention should be determined by the scope defined in the claims. Persons skilled in the art will appreciate that improvements and modifications may be made without departing from the spirit and scope of the present invention, and such improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A passive device temperature measurement optical path feedback device, characterized in that: include: A housing assembly having a closed light propagation channel, wherein the inner wall of the light propagation channel is roughened, and the housing assembly is provided with an insertion port for inserting an optical fiber of a passive component into the light propagation channel from a proximal end; and A light sensing device is provided on the housing assembly, the light sensing device is located at the far end of the light propagation channel, and a probe of the light sensing device penetrates into the housing assembly; The light emitted from the optical fiber is diffusely reflected by the inner wall of the light propagation channel treated with roughening, and the diffusely reflected light is sensed by the optical sensing device and converted into an electrical signal for feedback.

2. A passive device temperature measurement optical path feedback device according to claim 1, characterized in that: The light propagation channel includes a positioning channel section and a detection channel section arranged along the proximal to distal direction of the light transmission channel. The positioning channel section and the detection channel section are separated by a transparent partition, and the insertion port is arranged at the end of the positioning channel section opposite to the partition.

3. A passive device temperature measurement optical path feedback device as claimed in claim 2, characterized in that: The probe of the light sensing device senses from the peripheral side of the light propagation channel, and the distance between the light sensing device and the partition in the axial direction is adjustable to meet the sensing requirements of different light intensities.

4. A passive device temperature measurement optical path feedback device as claimed in claim 1, characterized in that: The housing assembly includes a metal shell and a channel component disposed in the metal shell. The channel component is made of quartz and forms the light propagation channel in the metal shell. The channel component cooperates with the metal shell to form a heat transfer structure for conducting heat outward.

5. The passive device temperature measurement optical path feedback device according to claim 4, characterized in that: The light sensing device is arranged on the metal shell, and a probe of the light sensing device passes through the metal shell and is located outside the channel component, so that the light sensing device senses diffusely reflected light from the outside of the channel component.

6. The passive device temperature measurement optical path feedback device according to claim 4, characterized in that: The channel member includes a groove member and a cover plate, wherein the groove member passes through two opposite sides of the light propagation channel in the axial direction, the cover plate is arranged on the groove member, and the metal shell seals the two sides of the channel member to form the light propagation channel; And / or, the metal shell includes a groove-shaped shell and a cover provided on the groove-shaped shell, and the cover is provided with a mounting hole for the probe of the light sensing device to penetrate.

7. The passive device temperature measurement optical path feedback device according to claim 4, characterized in that: An attenuation plate is provided between the probe of the optical sensing device and the channel component, and / or a heat exchange device is provided on the outside of the shell assembly.

8. The passive device temperature measurement optical path feedback device according to claim 1, characterized in that: The passive device further comprises a cladding light stripper, and the optical fiber is inserted into the light propagation channel of the housing assembly after passing through the cladding light stripper.

9. The passive device temperature measurement optical path feedback device according to claim 1, characterized in that: The end face of one end of the optical fiber inserted into the light propagation channel is not cut flush.

10. A passive device temperature measurement optical path feedback method, based on a passive device temperature measurement optical path feedback device according to any one of claims 1 to 9, characterized in that: The following steps are involved: A housing assembly having a closed light propagation channel is provided, wherein the inner wall of the light propagation channel is roughened, and a light sensing device is provided on the housing assembly, the light sensing device is located at the far end of the light propagation channel, and a probe of the light sensing device penetrates into the housing assembly and is located at the far end of the light propagation channel; inserting the optical fiber of the passive component into the proximal end of the light propagation channel of the housing assembly; The light emitted from the optical fiber forms diffusely reflected light after passing through the roughened channel wall in the light propagation channel. The diffusely reflected light is sensed by the optical sensing device and converted into an electrical signal for feedback.

Images