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CN-120869542-B - Tail fiber interface testing system and method

CN120869542BCN 120869542 BCN120869542 BCN 120869542BCN-120869542-B

Abstract

The invention discloses a system and a method for testing a tail fiber interface, the system comprises a fixed component, a first light source, a second light source, a first imaging module, a second imaging module and a signal processing module. The first imaging module receives the optical signals refracted and reflected by the first end, the second imaging module receives the optical signals transmitted by the inside of the optical fiber and then the end face of the first end, and the signal processing module detects preset indexes according to the optical signals. The method realizes detection and failure judgment on surface pollution, coating damage, curvature deformation and the like of the tail fiber interface through multi-angle optical signal projection, multi-module signal acquisition, combination strength ratio analysis, light spot offset calculation, avoidance test and the like. The invention can accurately evaluate the performance of the tail fiber interface and provides an effective scheme for quality detection.

Inventors

  • LIU YUANFEI

Assignees

  • 广昌县中广创新电子科技有限公司

Dates

Publication Date
20260512
Application Date
20250612

Claims (8)

  1. 1. The utility model provides a pigtail interface test system, the pigtail interface includes first end and second end, first end is the naked link of optic fibre, the stiff end for providing fiber connection, its characterized in that includes: A fixing assembly for providing an installation space of the pigtail interface; a light source comprising a first light source and a second light source, The first light source is arranged in the fixed component and provides first test light signals with different incidence angles to the first end; the second light source is connected with the second end and provides second test light signals with different incidence angles to the second end; An imaging module comprising a first imaging module and a second imaging module, The first imaging module is disposed within the fixed assembly and configured to receive a first test light signal refracted and reflected by the first end, The second imaging module is arranged in the fixed assembly and is configured to receive a second test optical signal formed by the first end face after being transmitted through the inside of the optical fiber; The signal processing module is configured to receive the first test optical signal and the second test optical signal, detect preset indexes of the tail fiber interface, calculate the intensity ratio of refraction and reflection signals, judge that surface pollution or coating damage exists, analyze the offset of a reflection light spot, adjust the incident position, identify a curvature deformation area, and compare the attenuation rate of transmission signals in an avoidance state and an original state to judge transmission degradation or surface flaws.
  2. 2. The pigtail interface test system of claim 1, wherein the first imaging module comprises a ipsilateral sensor set and a contralateral sensor set, the field of view axes of the ipsilateral sensor set and contralateral sensor set being perpendicular to the axial direction of the bare optical fiber at the first end; the same-side sensor group is arranged on the same side of the first light source in the light emitting direction and is configured to acquire a transmitted light signal refracted by the end face of the optical fiber; The opposite side sensor group is arranged at the opposite side of the light emitting direction of the first light source and is configured to acquire a reflected light signal reflected by the end face of the optical fiber.
  3. 3. The pigtail interface test system of claim 1, wherein the first light source is configured to adjust the location of incidence at the first end by: The first light source is movably arranged in the fixed component, the irradiation angle and the position of the first light source are changed through rotation or translation, and the first light source has an initial variable incident angle which does not rotate or translate; and/or And driving the fixing assembly to move so as to enable the tail fiber interface to rotate or deflect, and simultaneously maintaining the axis of the bare optical fiber at the first end to be aligned with the center of the imaging area of the second imaging module.
  4. 4. The pigtail interface test system of claim 1, wherein the signal processing module is specifically configured to: Comparing the signal intensity difference between the sensor group at the same side and the sensor group at the opposite side to generate a total light intensity value and a refraction-reflection intensity ratio of the first test light signal after refraction and reflection separation, If the strength ratio exceeds the reference range, judging that the exposed optical fiber of the optical fiber interface has surface pollution or coating damage; if the light spot formed by the reflected light signal received by the opposite side sensor is shifted at the preset position, calculating the offset of the light spot, and obtaining the curvature deformation of the exposed optical fiber.
  5. 5. The system of claim 4, wherein the signal processing module is further configured to perform a curvature deformation isolation test: when the curvature deformation exists at the specific position of the first end, generating three-dimensional space coordinates of a deformation area; Controlling the second light source to adjust the incident angle of a second test light signal, so that the light avoids the axial projection path of the deformation region when the light is transmitted in the optical fiber; The isolated transmission signals of the second imaging module are collected in an evading state and compared with the transmission signals in an original incident state: if the attenuation rate improvement amplitude of the isolated transmission signal exceeds a preset threshold value, judging that the deformation causes the degradation of the light transmission performance; And if the change of the attenuation rate is within the preset range, judging that the deformation is a nonfunctional surface flaw.
  6. 6. The system of claim 5, wherein the signal processing module is further configured to: Controlling the first light source and the second light source to perform cooperative traversal scanning: The first light source irradiates the end face of the first end with increasing incidence angles alpha (alpha 1 -alpha n), and synchronously records deformation zone coordinate sets { C alpha }; The second light source adjusts an incident angle beta (beta 1 -beta m) according to each deformation region coordinate set { C alpha }, performs avoidance test in curvature deformation isolation test, and generates a transmission attenuation rate matrix A [ alpha, beta ]; constructing a surface-transmission space mapping model, associating a coordinate set { C alpha } with an attenuation rate matrix A [ alpha, beta ], and establishing a three-dimensional relation map of deformation positions and transmission performance; Performing multi-threshold comprehensive evaluation based on the map, and judging structural failure when attenuation improvement amplitudes of deformation areas exceeding a preset proportion in the avoidance test exceed preset thresholds in the curvature deformation isolation test; And if the original transmission attenuation rate of the deformation region of the optical fiber axle center region exceeds the threshold value after the sensitivity coefficient adjustment, directly judging that the integrity is invalid.
  7. 7. The system of claim 6, wherein the setting of the sensitivity coefficient comprises: Respectively manufacturing simulated deformation defects with the same specification in an axial center region and an edge region of a standard optical fiber sample, measuring transmission attenuation increment caused by each defect position, and calculating the proportion value of the attenuation increment of the defects in the axial center region to the attenuation increment of the defects in the edge region; Setting the sensitivity coefficient equal to the ratio value when the ratio value reaches a first critical level; Setting the sensitivity coefficient to be a fixed protection value when the proportion value is in a middle range; and the failure judgment threshold value of the deformation of the axle center area is adjusted to be a standard failure threshold value multiplied by a sensitivity coefficient.
  8. 8. The tail fiber interface testing method is characterized by comprising the following steps of: s1, installing a tail fiber interface on a fixed assembly, wherein the tail fiber interface comprises a first end and a second end, the first end is a bare connecting end of an optical fiber, and the second end is a fixed end for providing optical fiber connection; The first light source projects a multi-angle first test light signal to the exposed end face of the optical fiber at the first end, and the second light source injects a multi-angle second test light signal to the second end; s2, capturing a transmitted light signal refracted by the end face through a same-side sensor group, capturing a reflected light signal reflected by the end face through a opposite-side sensor group, and synchronously acquiring a second test light signal transmitted through an optical fiber and output from a first end through a second imaging module; s3, calculating the intensity ratio of the refraction signal to the reflection signal, and judging that surface pollution or coating damage exists when the intensity ratio exceeds a reference range; Analyzing the offset of the reflected light spot, and generating a three-dimensional coordinate of the curvature deformation region when the offset exceeds the standard; S4, adjusting the incident position by adopting any one of the following modes: driving the first light source to rotate or translate; maintaining the first end axis to be aligned with the center of the second imaging module, and integrally deflecting and fixing the assembly; S5, when the curvature deformation area is identified, controlling a second light source to adjust the incident angle so that a second test light signal avoids the axial path of the deformation area; s6, comparing the attenuation rate of the transmission signal in the avoidance state with that in the original state: If the attenuation improvement amplitude exceeds a preset threshold, judging that the deformation causes transmission degradation; If the attenuation does not change significantly, judging that the surface is defective; S7, controlling a first light source to increase an incident angle to scan the end face, synchronously recording the coordinates of deformation areas of each angle, and controlling a second light source to avoid testing at multiple angles and recording attenuation data aiming at the coordinates of each deformation area; s8, establishing a spatial mapping relation between deformation position coordinates and transmission attenuation data; S9, judging structural failure when attenuation improvement exceeds standard in the avoidance test of the deformation zone exceeding the preset proportion; and (3) for the axle center deformation region, calculating the comparison value of the original attenuation rate and the standard failure threshold multiplied by the sensitivity coefficient, and judging the integral failure when exceeding the standard.

Description

Tail fiber interface testing system and method Technical Field The invention relates to the technical field of visual inspection, in particular to a tail fiber interface testing system and method. Background In the field of optical fiber communication, the performance of a pigtail interface directly affects the transmission quality of an optical signal. The existing tail fiber interface testing technology has a plurality of defects. On the one hand, the traditional testing system has single detection dimension on the tail fiber interface, and can only test a certain index, so that comprehensive performance of the interface is difficult to evaluate comprehensively. For example, most systems can only detect the presence of contamination on the surface, but cannot effectively identify other potential problems such as coating damage, curvature deformation, etc. On the other hand, the control of the incident angle of the optical signal is not flexible enough, and multi-angle test is difficult to realize, so that the performance evaluation of the interface under different working conditions is incomplete. In addition, in terms of signal processing and analysis, the prior art lacks comprehensive processing capability for multiple parameters in the refraction, reflection and transmission processes of an optical signal, and cannot accurately judge the nature and severity of an interface defect, for example, it is difficult to distinguish whether curvature deformation is a functional defect or a nonfunctional surface defect which causes degradation of optical transmission performance, so that the quality detection precision and reliability of a pigtail interface are limited, and the requirements of a high-speed and high-stability optical fiber communication system are difficult to meet. Disclosure of Invention In order to solve the above problems, the present invention provides a system and a method for testing a pigtail interface. The aim of the invention is realized by adopting the following technical scheme: In a first aspect, a pigtail interface test system includes a first end and a second end, where the first end is a bare optical fiber connection end, and the second end is a fixed end for providing optical fiber connection, and the pigtail interface test system is characterized by including: A fixing assembly for providing an installation space of the pigtail interface; a light source comprising a first light source and a second light source, The first light source is arranged in the fixed component and provides first test light signals with different incidence angles to the first end; the second light source is connected with the second end and provides second test light signals with different incidence angles to the second end; An imaging module comprising a first imaging module and a second imaging module, The first imaging module is disposed within the fixed assembly and configured to receive a first test light signal refracted and reflected by the first end, The second imaging module is arranged in the fixed assembly and is configured to receive a second test optical signal formed by the first end face after being transmitted through the inside of the optical fiber; the signal processing module is configured to receive the first test optical signal and the second test optical signal and detect a preset index of the tail fiber interface. The first imaging module comprises an ipsilateral sensor group and a contralateral sensor group, and the visual field axes of the ipsilateral sensor group and the contralateral sensor group are perpendicular to the axial direction of the bare optical fiber at the first end; the same-side sensor group is arranged on the same side of the first light source in the light emitting direction and is configured to acquire a transmitted light signal refracted by the end face of the optical fiber; The opposite side sensor group is arranged at the opposite side of the light emitting direction of the first light source and is configured to acquire a reflected light signal reflected by the end face of the optical fiber. As a preferred mode, the first light source is arranged to adjust the incident position at the first end as follows: The first light source is movably arranged in the fixed component, the irradiation angle and the position of the first light source are changed through rotation or translation, and the first light source has an initial variable incident angle which does not rotate or translate; and/or And driving the fixing assembly to move so as to enable the tail fiber interface to rotate or deflect, and simultaneously maintaining the axis of the bare optical fiber at the first end to be aligned with the center of the imaging area of the second imaging module. As a preferred manner, the signal processing module is specifically configured to: Comparing the signal intensity difference between the sensor group at the same side and the sensor group at the opposite side to g