Optical fiber with low reflection interference and measuring device
Through light-providing optical fiber and return fiber are connected to the optical waveguide, the end surface of the optical waveguide directly emits light, reducing the reflection interface, solving the reflection interference and microcrack problems of the optical fiber device, and improving measurement accuracy and device life.
Patent Information
- Application Number
- CN202422532788.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-18
- Publication Date
- 2025-08-15
- Estimated Expiration
- 2034-10-18
AI Technical Summary
The existing optical fiber devices and measuring devices have reflected light interference during the penetration of the interface, which causes misjudgment when measuring faint light. Moreover, the optical fiber is prone to small cracks after long-term use or bent, which affects the measurement accuracy and life.
The optical fiber and the return fiber are connected to the optical waveguide. The optical waveguide and the measurement output input interface are not connected to the optical fiber. The end surface of the optical waveguide directly emits light to reduce the reflection interface. The inclined structure and coating are used to reduce reflection. The optical fiber and the optical waveguide are glued and fixed.
It effectively reduces reflected interference, improves measurement accuracy of weak signals, extends the service life of the device, enhances environmental resistance, and reduces assembly costs.
Smart Images
Figure CN223229020U_ABST
Abstract
Description
Technical field
[0001] The utility model relates to the technical field of optical devices, in particular to an optical fiber with low reflection interference and a measuring device. [Background Technology]
[0002] In existing fiber optic devices and measurement systems, light from the light source and light destined for the measurement end typically travel through an optical waveguide, then a section of measurement fiber, and then on to the measurement end. This involves passing through an interface between the optical waveguide and the measurement fiber, and again at the measurement fiber's exit end.
[0003] The optical fiber device and measuring device of the prior art have the following defects:
[0004] 1. During the process of penetrating the interface, a small amount of reflected light will always be superimposed on the measurement light, causing interference. Especially when the measurement light is weak, the intensity of the interference light may even exceed that of the measurement light, causing misjudgment, serious inaccuracy, or even making the measurement impossible.
[0005] 2. After long-term use, especially after bending, the measuring optical fiber is prone to tiny cracks inside the optical fiber. These tiny cracks will directly reflect the light from the optical fiber back to the optical measurement unit, which will also cause interference. [Utility Model Content]
[0006] In order to overcome the above problems, the present invention proposes an optical fiber and a measuring device with low reflection interference that can effectively solve the above problems.
[0007] The present invention provides a technical solution to solve the above-mentioned technical problems: providing an optical fiber and a measuring device with low reflection interference, comprising a light-providing optical fiber, an optical waveguide, and a return optical fiber, wherein the light-providing optical fiber and the return optical fiber are both connected to the optical waveguide, and the optical waveguide couples or distributes light. A measuring optical part is provided on one side of the optical waveguide, and an interface between the optical waveguide and the measurement output and input end is formed at one end of the optical waveguide facing the measurement optical part, and the interface between the optical waveguide and the measurement output and input end is not connected to an optical fiber.
[0008] Preferably, the optical fiber with low reflection interference and the measuring device include a detachable housing, the housing is used for detachably connecting to the measuring optical part, and the optical waveguide is arranged in the housing.
[0009] Preferably, the optical fiber with low reflection interference and the measuring device include a light providing part for providing measurement light and a light measuring part for measuring measured information, the light providing part corresponds to one end of the light providing optical fiber, and the light measuring part corresponds to one end of the return optical fiber.
[0010] Preferably, the optical waveguide and the measurement input / output interface are used to output light from the light providing part to the measurement optical part, and to transmit the measurement light from the measurement optical part to the light measurement part.
[0011] Preferably, the light-providing optical fiber and the light-providing unit are connected via an optical fiber connector, and the return optical fiber and the light-measuring unit are connected via an optical fiber connector; the light-providing optical fiber is used to transmit light from the light-providing unit to the optical waveguide.
[0012] Preferably, the connection between the light-providing optical fiber and the optical waveguide forms an interface between the light-providing optical fiber and the optical waveguide, and the light-providing optical fiber and the optical waveguide are fixed by gluing.
[0013] Preferably, the connection between the return optical fiber and the optical waveguide forms an interface between the return optical fiber and the optical waveguide, and the return optical fiber and the optical waveguide are fixed by gluing; the return optical fiber is used to transmit the light carrying the measured information to the optical measurement unit.
[0014] Preferably, the end face of the interface between the optical waveguide and the measurement input and output ends adopts an inclined structure.
[0015] Preferably, the end face of the interface between the optical waveguide and the measurement input and output ends is additionally coated.
[0016] Preferably, the measurement optical part is a spectral confocal measurement optical part or an interferometric measurement optical part.
[0017] Compared with the prior art, the optical fiber and measuring device with low reflection interference of the present invention directly emit light through the end face of the optical waveguide, which reduces the number of interfaces that are prone to reflection interference by 50% (two are reduced to one, and the light reflected at the interface between the light-providing optical fiber and the optical waveguide will return to the light-providing part instead of the light-measuring part, so it will not interfere with the measurement and does not need to be counted). One optical fiber is reduced, the structure is simplified, and the assembly cost is reduced. There will be no problem of tiny cracks easily generated inside the measuring optical fiber after long-term use, especially after bending. The problem of these microcracks directly reflecting the light from the optical fiber back to the light-measuring part and causing interference can be effectively avoided. This is beneficial to improving the measurement of weak signals by such measuring devices (for example, the measured light reflection signal is weak when measuring objects made of black materials), as well as increasing the service life and resistance to the use environment of such measuring devices (the optical fiber of such measuring devices often moves with the high-speed motion module, and the optical fiber is often bent repeatedly at high frequency in the drag chain), thereby improving the reliability of the measurement results.
Brief Description of the Drawings
[0018] Figure 1 This is a structural diagram of a first embodiment of the optical fiber and measuring device with low reflection interference according to the present utility model;
[0019] Figure 2This is a structural diagram of a second embodiment of the optical fiber and measuring device with low reflection interference of the utility model;
[0020] Figure 3 This is a structural diagram of embodiment 3 of the optical fiber and measuring device with low reflection interference of the present utility model. [Specific implementation method]
[0021] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and implementation examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.
[0022] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are limited to relative positions on a specified view, rather than absolute positions.
[0023] In addition, the terms "first," "second," and so on, used in this utility model are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.
[0024] See also Figure 1 In the first embodiment of the optical fiber and measuring device with low reflection interference of the present invention, the optical fiber and the measuring device include a light-providing optical fiber 102, an optical waveguide 104, and a return optical fiber 109. The light-providing optical fiber 102 and the return optical fiber 109 are both connected to the optical waveguide 104. The optical waveguide 104 couples or distributes light. A measuring optical part is provided on one side of the optical waveguide 104. An interface 105 between the optical waveguide and the measurement output-input end is formed at one end of the optical waveguide 104 facing the measurement optical part. The interface 105 between the optical waveguide and the measurement output-input end is not connected to an optical fiber.
[0025] The optical fiber and measuring device with low reflection interference includes a detachable housing for detachably connecting to the measuring optical part, and the optical waveguide 104 is disposed in the housing. The detachable structure facilitates modularization and replacement of measuring optical parts with different parameters.
[0026] The optical fiber and measuring device with low reflection interference include a light providing unit 101 for providing measurement light and a light measuring unit 110 for measuring the measured information. The light providing unit 101 corresponds to one end of the light providing optical fiber 102, and the light measuring unit 110 corresponds to one end of the return optical fiber 109. The light providing unit 101 can be a light source or an optical fiber from a light source. The light measuring unit 110 can be a light intensity or spectrum measuring instrument, or it can be connected to an optical fiber for transmission to the light measuring unit. The optical waveguide and measurement input and output interface 105 is used to output light from the light providing unit 101 to the measurement optical unit through this interface, and to transmit measurement light from the measurement optical unit to the light measuring unit 110 through this interface.
[0027] The light supply fiber 102 is connected to the light supply unit 101 via a fiber optic connector, and the return fiber 109 is connected to the light measurement unit 110 via a fiber optic connector. The light supply fiber 102 is used to transmit light from the light supply unit 101 to the optical waveguide 104 .
[0028] The connection between the light-providing optical fiber 102 and the optical waveguide 104 forms a light-providing optical fiber and optical waveguide interface 103 . The light-providing optical fiber 102 and the optical waveguide 104 can usually be fixed by gluing.
[0029] The return fiber 109 and the optical waveguide 104 are connected to form a return fiber and optical waveguide interface 108. The return fiber 109 and the optical waveguide 104 can usually be fixed by gluing. The return fiber 109 is used to transmit light carrying measured information to the optical measurement unit 110.
[0030] The end face of the optical waveguide and the measurement input / output interface 105 adopts an inclined structure, which can reduce reflection interference.
[0031] The end face of the optical waveguide and the measurement input / output interface 105 is coated with a functional coating. This coating can be a protective coating to protect against moisture and scratches, or an antireflection coating to further reduce interfacial reflections. The coating protects the end face, increases service life, improves transmittance, and further reduces reflection interference.
[0032] See also Figure 2The second embodiment of the low-reflection interference optical fiber and measurement device of the present invention is applied to a spectral confocal measurement device. The measurement optical section, located outside the interface 105 between the optical waveguide and the measurement input / output end, is a spectral confocal measurement optical section 106. This spectral confocal measurement optical section 106 is used to process the light from the optical waveguide and the measurement input / output end 105 according to measurement requirements. The light passing through spectral confocal measurement optical section 106 is a measurement beam 107, which is used to generate the beam carrying the measured information. The second embodiment illustrates a spectral confocal beam with different wavelengths arranged at different positions. After irradiating the object to be measured, a certain wavelength is returned with a stronger intensity.
[0033] See also Figure 3 The third embodiment of the low-reflection interference optical fiber and measurement device of the present invention is applied to an interferometric measurement device. The measurement optical portion disposed outside the optical waveguide and the measurement input / output interface 105 is an interferometric measurement optical portion 106. The interferometric measurement optical portion 106 processes the light from the optical waveguide and the measurement input / output interface 105 according to measurement requirements. The third embodiment illustrates an interferometric measurement collimated output optical portion. The light passing through the interferometric measurement optical portion 106 is a measurement beam 107, which is used to generate a beam carrying measured information. The third embodiment illustrates an interferometric measurement beam. After the light beams interfere with the measured thin film, the spectrum changes.
[0034] Compared with the prior art, the optical fiber and measuring device with low reflection interference of the present invention directly emit light through the end face of the optical waveguide, which reduces the number of interfaces that are prone to reflection interference by 50% (two are reduced to one, and the light reflected at the interface between the light-providing optical fiber and the optical waveguide will return to the light-providing part instead of the light-measuring part, so it will not interfere with the measurement and does not need to be counted). One optical fiber is reduced, the structure is simplified, and the assembly cost is reduced. There will be no problem of tiny cracks easily generated inside the measuring optical fiber after long-term use, especially after bending. The problem of these microcracks directly reflecting the light from the optical fiber back to the light-measuring part and causing interference can be effectively avoided. This is beneficial to improving the measurement of weak signals by such measuring devices (for example, the measured light reflection signal is weak when measuring objects made of black materials), as well as increasing the service life and resistance to the use environment of such measuring devices (the optical fiber of such measuring devices often moves with the high-speed motion module, and the optical fiber is often bent repeatedly at high frequency in the drag chain), thereby improving the reliability of the measurement results.
[0035] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any modifications, equivalent replacements and improvements made within the concept of the present invention should be included in the patent protection scope of the present invention.
Claims
1. An optical fiber and measuring device with low reflection interference, comprising a light-supplying optical fiber, an optical waveguide, and a return optical fiber, wherein the light-supplying optical fiber and the return optical fiber are both connected to the optical waveguide, the optical waveguide couples or distributes light, a measurement optical portion is provided on one side of the optical waveguide, and an end of the optical waveguide facing the measurement optical portion forms an interface between the optical waveguide and a measurement input and output end, characterized in that: The optical waveguide and the measurement input and output end interface are not connected to an optical fiber.
2. The optical fiber and measuring device with low reflection interference according to claim 1, wherein: The optical fiber and measuring device with low reflection interference include a detachable shell, the shell is used for detachably connecting with the measuring optical part, and the optical waveguide is arranged in the shell.
3. The optical fiber and measuring device with low reflection interference according to claim 1, wherein: The optical fiber with low reflection interference and the measuring device include a light providing part for providing measurement light and a light measuring part for measuring measured information. The light providing part corresponds to one end of the light providing optical fiber, and the light measuring part corresponds to one end of the return optical fiber.
4. The optical fiber with low reflection interference and the measuring device according to claim 3, wherein: The optical waveguide and the measurement input / output interface are used to output light from the light providing part to the measurement optical part, and to transmit the measurement light from the measurement optical part to the light measurement part.
5. The optical fiber with low reflection interference and the measuring device according to claim 3, wherein: The light-providing optical fiber is connected to the light-providing unit via an optical fiber connector, and the return optical fiber is connected to the light-measuring unit via an optical fiber connector. The light-providing optical fiber is used to transmit light from the light-providing unit to the optical waveguide.
6. The optical fiber with low reflection interference and the measuring device according to claim 1, wherein: The connection between the light-providing optical fiber and the optical waveguide forms an interface between the light-providing optical fiber and the optical waveguide, and the light-providing optical fiber and the optical waveguide are fixed by gluing.
7. The optical fiber with low reflection interference and the measuring device according to claim 3, wherein: The connection between the return optical fiber and the optical waveguide forms an interface between the return optical fiber and the optical waveguide. The return optical fiber and the optical waveguide are fixed by gluing. The return optical fiber is used to transmit light carrying measured information to the optical measurement unit.
8. The optical fiber with low reflection interference and the measuring device according to claim 1, wherein: The end face of the interface between the optical waveguide and the measurement input and output ends adopts an inclined structure.
9. The optical fiber with low reflection interference and the measuring device according to claim 1, wherein: The end face of the interface between the optical waveguide and the measurement input and output ends is additionally coated.
10. The optical fiber with low reflection interference and the measuring device according to claim 1, wherein: The measurement optical part is a spectral confocal measurement optical part or an interferometric measurement optical part.