A multi-core fiber interference calibration reference sample and a method for calibrating a multi-core interferometer

Abstract

The present invention discloses a multi-core optical fiber interference calibration standard sample and a method for calibrating a multi-core interferometer, which includes a base body and a base sleeve; the base body is installed on the base sleeve; the base body includes an optical fiber sleeve and an optical fiber; the optical fiber sleeve is wrapped on the outer side surface of the optical fiber; the upper surface of the base sleeve is a test surface, and the test surface includes at least more than two optical fiber characteristic surfaces, and the optical fiber characteristic surfaces have multi-core optical fiber steps; the distance between the top of a single optical fiber on the optical fiber characteristic surface and the core fitting surface is the corresponding core depression; the distance between the top of a single optical fiber on the optical fiber characteristic surface and the upper fitting surface of the optical fiber sleeve is the corresponding marked optical fiber height. The multi-core optical fiber interference calibration standard sample provided by the present invention can expand the standard sample range and reduce the influence amount of measurement uncertainty introduced by different material characteristics, etc., improve the calibration accuracy, facilitate the multi-value measurement calibration and function expansion of the multi-core optical fiber interferometer, has a compact structure, small volume, and multiple values, and is convenient for normalized storage.

Description

Technical Field

[0001] The present invention relates to the technical field of calibration and detection of multi-core fiber optic interferometers, and particularly to a calibration standard sample for multi-core fiber optic interference calibration and a method for calibrating a multi-core interferometer with the calibration standard sample. Background Art

[0002] The existing standard samples for multi-core fiber optic interferometers only have a narrowband array structure in the same appliance plane, which cannot cover the wide-range calibration requirements of multi-core fiber optic interferometers. Moreover, there is no calibration standard sample that can meet both the single quantity calibration and the multi-value three-dimensional shape characterization requirements of multi-core fibers. Summary of the Invention

[0003] To solve the above technical problems, the object of the present invention is to provide a calibration standard sample for multi-core fiber optic interference calibration and a method for calibrating a multi-core interferometer with the calibration standard sample. The calibration standard sample for multi-core fiber optic interference can expand the range of the standard sample and reduce the influence of measurement uncertainty introduced by different material characteristics, improve the calibration accuracy, facilitate the multi-value measurement calibration and function expansion of the multi-core fiber optic interferometer, and has a compact structure, small volume, multi-values, and is convenient for unified storage.

[0004] The object of the present invention is achieved by the following technical solutions:

[0005] A calibration standard sample for multi-core fiber optic interference, comprising a seat body and a base sleeve; the seat body is installed on the base sleeve;

[0006] The seat body includes an optical fiber sleeve and an optical fiber; the optical fiber sleeve is wrapped on the outer side surface of the optical fiber; the upper surface of the base sleeve is a test surface, and the test surface includes at least two or more optical fiber characteristic surfaces, and the optical fiber characteristic surfaces have multi-core fiber steps; the distance between the top of a single optical fiber on the optical fiber characteristic surface and the core fitting surface is the corresponding core depression; the distance between the top of a single optical fiber on the optical fiber characteristic surface and the upper fitting surface of the optical fiber sleeve is the corresponding marked optical fiber height.

[0007] A method for calibrating a multi-core fiber optic interferometer with a calibration standard sample for multi-core fiber optic interference, comprising:

[0008] Placing the calibration standard sample for multi-core fiber optic interference on the workbench of the multi-core fiber optic interferometer, adjusting and controlling the precision displacement device of the multi-core fiber optic interferometer, and observing the test interference image of the calibration standard sample for multi-core fiber optic interference;

[0009] Measuring the standard optical fiber height of the test surface and the standard core depression of the sleeve end face, and comparing the measured values with the calibration values of the calibration standard sample for multi-core fiber optic interference;

[0010] Adjusting the position of the seat body to avoid the standard optical fiber height difference of the sleeve surface scanned by the bonding surface, obtaining a scanned image, performing microscopic three-dimensional reconstruction, and then performing measurement;

[0011] Compare the measured values with the calibration values of the multi-core fiber optic interference calibration standard sample, record and analyze, remove the standard sample, and complete the calibration of the multi-core fiber optic interferometer.

[0012] Compared with the prior art, one or more embodiments of the present invention may have the following advantages:

[0013] The multi-core fiber optic interference calibration standard sample has a compact structure, small volume, multiple measurement values, is convenient for normalized storage, can expand the standard sample range and reduce the influence of measurement uncertainty introduced by different material characteristics, improve the calibration accuracy, and is conducive to multi-core fiber optic interference multi-measurement value measurement calibration and function expansion. Description of the Drawings

[0014] Figure 1a and 1b are schematic three-dimensional structure diagrams of the multi-core fiber optic interference calibration standard sample;

[0015] Figure 2 is a cross-sectional view of the matrix of the multi-core fiber optic interference calibration standard sample;

[0016] Figure 3 is a flowchart of the method for calibrating a multi-core interferometer with the multi-core fiber optic interference calibration standard sample. Detailed Embodiments

[0017] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with embodiments and the accompanying drawings.

[0018] As Figure 1a , 1b and Figure 2 shown, they are a diagram of the multi-core fiber optic interference calibration standard sample and a cross-sectional view of the matrix of the multi-core fiber optic interference calibration standard sample, including a base body 10 and a base sleeve 20; the base body 10 is installed on the base sleeve 20; the base body 10 includes an optical fiber sleeve 11 and an optical fiber 12; the optical fiber sleeve 11 wraps around the outer side of the optical fiber 12; the upper surface of the base sleeve 20 is a test surface, and the test surface includes at least two or more optical fiber characteristic surfaces, and the optical fiber characteristic surfaces have multi-core fiber steps 18; the distance between the top of a single optical fiber on the optical fiber characteristic surface and the core fitting surface is the corresponding core depression 15; the distance between the top of a single optical fiber on the optical fiber characteristic surface and the upper fitting surface of the optical fiber sleeve 11 is the corresponding marked optical fiber height 14.

[0019] The multi-core fiber optic interference standard sample is a standard device for calibrating a multi-core interferometer.

[0020] The height of the multi-core fiber steps 18 is the standard optical fiber height 14, and each optical fiber on the optical fiber characteristic surface has a corresponding standard optical fiber depression, and the planes of each array of optical fibers are staggered from each other to form a standard optical fiber height difference 15.

[0021] The base sleeve 20 is marked with a mark 21, and the mark 21 corresponds to the direction of the optical fiber 12. The setting of the mark 21 facilitates the extraction of the cross-sectional data of the mark 21 after fitting the remaining shapes, so as to obtain indicators such as the standard height and the standard core depression.

[0022] The test surface 13 includes a first-stage optical fiber surface and a second-stage optical fiber surface, and the first-stage optical fiber surface and the second-stage optical fiber surface are respectively fitting surfaces; the first-stage optical fiber arc surface is the optical fiber end face 131, and the second-stage optical fiber surface is the sleeve end face 132. The circular first-stage optical fiber surface and the second-stage optical fiber surface facilitate the collection of interferometer fringes.

[0023] The marked optical fiber height on the surface of the arrayed optical fibers covers 0 to 10 microns, and the standard value of the core depression of the optical fiber core surface covers 0 to 1 micron; the calibration applicability of the optical fiber height and the core depression is improved.

[0024] The seat body 10 further includes an adhesive area 16, and the upper end face of the adhesive area 16 is an adhesive surface 161; the optical fiber sleeve 11 is wrapped and adhered to the outer side surface of the optical fiber 12 through the adhesive area 16. During two-dimensional calibration, the surface topography of the multi-core optical fiber interference calibration standard sample can be scanned by contact to obtain indicators such as the standard optical fiber height and the standard core depression; in the three-dimensional mode, after obtaining the three-dimensional topography by simultaneously scanning the optical fiber end face 131 and the sleeve end face 132, the shapes of the optical fiber surface 131 and the adhesive surface 161 are removed to obtain indicators such as the standard optical fiber height and the standard core depression.

[0025] The optical fiber sleeve 11 is made of epoxy resin or silicon; the optical fiber 12 is made of silica or silicon.

[0026] During use, first place the multi-core optical fiber interference calibration standard sample. The light beam is split and the precise displacement device is adjusted on the test surface to form a microscopic surface optical precision interference. The multi-core interference fringes are collected by the detection sensor; through the operation of the fringe background light intensity distribution, the phase difference of each point of the microscopic surface interference fringes is mapped one by one with the height difference of each characteristic surface of the multi-core optical fiber, and after processing, a fused image is obtained and compared and calibrated with the standard value through the microscopic three-dimensional reconstruction measurement method; through the operation of the fringe background light intensity distribution, the phase difference of the interference fringes is mapped one by one with the core depression of each characteristic surface of the multi-core optical fiber, and after processing, a fused image is obtained and compared and calibrated with the standard depression value through the microscopic three-dimensional reconstruction measurement method; through the operation of the fringe background light intensity distribution, the phase difference of each point of the microscopic surface interference fringes is mapped one by one with the height difference of each characteristic surface of the multi-core optical fiber, and after processing, a fused image is obtained and compared and calibrated with the height difference between the multi-core array optical fibers and the standard optical fiber height difference value through the microscopic three-dimensional reconstruction measurement method; this multi-core optical fiber interference calibration standard sample can expand the standard sample range and reduce the influence of measurement uncertainties introduced by different material properties, etc., improve the calibration accuracy, facilitate the multi-value measurement calibration and function expansion of the multi-core optical fiber interferometer, has a compact structure, a small volume, and multiple values, and is convenient for unified storage.

[0027] As Figure 3 shown, this embodiment also provides a method for calibrating a multi-core interferometer with a multi-core fiber interference calibration standard sample, including the following steps:

[0028] Step 10: Place the multi-core fiber interference calibration standard sample on the workbench of the multi-core fiber interferometer, adjust and control the precision displacement device of the multi-core fiber interferometer, and observe the test interference image of the multi-core fiber interference calibration standard sample;

[0029] Step 20: Measure the standard fiber height of the test surface and the standard core depression of the sleeve end face, and compare the measured values with the calibration values of the multi-core fiber interference calibration standard sample;

[0030] Step 30: Adjust the position of the seat body, avoid the bonding surface, scan the standard fiber height difference of the sleeve surface, obtain the scanned image, perform microscopic three-dimensional reconstruction, and then measure;

[0031] Step 40: Compare the measured values with the calibration values of the multi-core fiber interference calibration standard sample, record and analyze, take out the standard sample, and complete the calibration of the multi-core fiber interferometer.

[0032] The above calibration method can expand the range of the standard sample and reduce the influence of measurement uncertainties introduced by different material properties, etc., improve the calibration accuracy, facilitate the calibration and function expansion of multi-value measurements of the multi-core fiber interferometer, and can calibrate indicators such as fiber height, core depression, and fiber height difference, with good calibration effects.

[0033] Although the disclosed embodiments of the present invention are as above, the described content is only an embodiment adopted for facilitating the understanding of the present invention and is not intended to limit the present invention. Any person skilled in the art within the technical field to which the present invention pertains may make any modifications and changes in the form and details of the implementation without departing from the spirit and scope disclosed by the present invention. However, the scope of patent protection of the present invention shall still be subject to the scope defined by the appended claims.

Claims

1. A method for calibrating a multi-core interferometer with a multi-core optical fiber interference calibration standard sample, characterized in that, it includes a base body (10) and a base sleeve (20); the base body (10) is installed on the base sleeve (20); the base body (10) includes an optical fiber sleeve (11) and an optical fiber (12); the optical fiber sleeve (11) is wrapped around the outer side surface of the optical fiber (12); the upper surface of the base sleeve (20) is a test surface, and the test surface includes at least two or more optical fiber characteristic surfaces, and the optical fiber characteristic surfaces have multi-core optical fiber steps (18); the distance from the top of a single optical fiber on the optical fiber characteristic surface to the core fitting surface is the corresponding standard core depression (15); the distance from the top of a single optical fiber on the optical fiber characteristic surface to the upper fitting surface of the optical fiber sleeve (11) is the corresponding standard optical fiber height (14); the height of the multi-core optical fiber step (18) is the standard optical fiber height (14), and each optical fiber on the optical fiber characteristic surface has a corresponding standard optical fiber depression, and the planes of each array of optical fibers are staggered from each other to form a standard optical fiber height difference; a mark (21) is provided on the base sleeve (20), and the mark (21) corresponds to the direction of the optical fiber (12), which is convenient for extracting the marked cross-section data after shape fitting to obtain the standard height and standard core depression indexes; the test surface (13) includes a first-level optical fiber surface and a second-level optical fiber surface, and the first-level optical fiber surface and the second-level optical fiber surface are respectively fitting surfaces; the first-level optical fiber surface is the optical fiber end face (131), and the second-level optical fiber surface is the sleeve end face (132). The circular first-level optical fiber surface and the second-level optical fiber surface are convenient for collecting the interferometer fringes; in two-dimensional calibration, the surface topography of the multi-core optical fiber interference calibration standard sample is scanned by contact to obtain the standard optical fiber height and standard core depression indexes; in three-dimensional mode, after obtaining the three-dimensional topography by simultaneously scanning the optical fiber end face (131) and the sleeve end face (132), the shapes of the optical fiber end face (131) and the bonding surface (161) are removed to obtain the standard optical fiber height and standard core depression indexes; the standard optical fiber height on the multi-core optical fiber surface covers 0 to 10 micrometers, and the standard value of the depression of the optical fiber core surface covers 0 to 1 micrometer; the base body (10) further includes a bonding area (16), and the upper end face of the bonding area (16) is a bonding surface (161); the optical fiber sleeve (11) is wrapped and bonded to the outer side surface of the optical fiber (12) through the bonding area (16); in two-dimensional calibration, the surface topography of the multi-core optical fiber interference calibration standard sample is scanned by contact to obtain the standard optical fiber height and standard core depression indexes; in three-dimensional mode, after obtaining the three-dimensional topography by simultaneously scanning the optical fiber end face (131) and the sleeve end face (132), the shapes of the optical fiber surface (131) and the bonding surface (161) are removed to obtain the standard optical fiber height and standard core depression indexes; the optical fiber sleeve (11) is made of epoxy resin or silicon; the optical fiber (12) is made of silica or silicon; The method for calibrating a multi-core interferometer with a multi-core fiber interference calibration standard sample includes: placing the multi-core fiber interference calibration standard sample, adjusting and controlling a precision displacement device on the test surface by splitting light of a light beam to form a microscopic surface optical precision interference, and collecting multi-core interference fringes through a detection sensor; Mapping the phase difference of each point of the microscopic surface interference fringes and the height differences of each characteristic surface of the multi-core fiber one by one through the operation of the background light intensity distribution of the fringes, obtaining a fused image after processing and calibrating it by comparing with the standard value through the microscopic three-dimensional reconstruction measurement method; mapping the phase difference of the interference fringes and the core depressions of each characteristic surface of the multi-core fiber one by one through the operation of the background light intensity distribution of the fringes, obtaining a fused image after processing and calibrating it by comparing with the standard depression value through the microscopic three-dimensional reconstruction measurement method; mapping the phase difference of each point of the microscopic surface interference fringes and the height differences of each characteristic surface of the multi-core fiber one by one through the operation of the background light intensity distribution of the fringes, obtaining a fused image after processing and calibrating it by comparing the height differences of each array fiber of the multi-core with the height difference of the standard fiber through the microscopic three-dimensional reconstruction measurement method, recording and analyzing, taking out the standard sample, and completing the calibration of the multi-core fiber interferometer.

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