An optical fiber coding acquisition module and an identification system

Abstract

The present invention discloses an optical fiber coding acquisition module and an identification system. The optical fiber coding acquisition module includes: a base; a first optical fiber, on which a fiber grating is provided; a fixing table for fixing the first optical fiber from one side of the fiber grating; an optical fiber automatic rotating table for fixing the first optical fiber from the other side of the fiber grating and rotating according to a control instruction to drive the fiber grating to be distorted; and a spectral sensing array, which is opposite to the position of the fiber grating for collecting the light wave diffracted after the fiber grating is distorted. This solution uses the rotation of the optical fiber automatic rotating table to drive the optical fiber of the fiber grating to be distorted, thereby causing changes in the refractive angle reflection of the cladding and the core at the position of the optical fiber where the fiber grating is located, so that the reflected light wave of the fiber grating is transmitted from the cladding to the outside of the cladding, and then the transmitted light wave is collected and identified by the spectral sensing array for the spectral characteristics of the light wave, thus getting rid of the constraints of devices such as mirrors, and having a simple structure and reduced cost.

Description

Technical Field

[0001] The present invention relates to the field of optical fiber communication, and particularly to an optical fiber coding acquisition module and an identification system. Background Art

[0002] Conventional optical fiber coding recognition mainly relies on a diffraction grating device to separate light waves, and the separated light waves are then subjected to photoelectric conversion and acquisition by a photoelectric conversion array to realize the spectral recognition of the reflected light waves of the optical fiber coding. However, its diffraction grating device is expensive, and devices such as a mirror are required for assistance, resulting in high cost and complex structure. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. For this purpose, the present invention provides an optical fiber coding acquisition module and an identification system, which can get rid of the bondage of devices such as mirrors, and have a simple structure and reduced cost.

[0004] An optical fiber coding acquisition module according to an embodiment of the first aspect of the present invention includes a base; and the following components provided on the base: a first optical fiber provided with a fiber grating thereon; a fixing table for fixing the first optical fiber from one side of the fiber grating; an optical fiber automatic rotating table for fixing the first optical fiber from the other side of the fiber grating and rotating according to a control instruction to drive the fiber grating to be distorted; and a spectral sensing array opposite to the position of the fiber grating for collecting the light waves diffracted after the fiber grating is distorted.

[0005] An optical fiber coding acquisition module according to an embodiment of the first aspect of the present invention has at least the following beneficial effects: This solution uses the rotation of the optical fiber automatic rotating table to drive the distortion of the optical fiber of the fiber grating, thereby causing changes in the refractive angle reflection of the cladding and the core at the position of the optical fiber where the fiber grating is located, so that the reflected light waves of the fiber grating are transmitted from the cladding to the outside of the cladding, and then the transmitted light waves are collected and identified by the spectral sensing array for the spectral characteristics of the light waves, thus getting rid of the bondage of devices such as mirrors, and having a simple structure and reduced cost.

[0006] According to some embodiments of the first aspect of the present invention, the fiber grating is a long-period fiber grating, a fiber Bragg grating or a phase-shifted fiber grating.

[0007] According to some embodiments of the first aspect of the present invention, the fixing table includes a fixing base, a fixing pressing piece and a bolt, screw holes are provided at corresponding positions of the fixing base and the fixing pressing piece for the bolt to lock, and the first optical fiber passes through between the fixing base and the fixing pressing piece and is clamped under the action of the bolt.

[0008] According to some embodiments of the first aspect of the present invention, plastic gaskets are provided on both inner sides of the fixing base and the fixing pressing piece opposite to each other.

[0009] According to some embodiments of the first aspect of the present invention, the automatic optical fiber rotating table includes: a stator fixed on the base; a rotor disposed opposite to the stator in the vertical direction; a hollow rotating shaft sleeved at the middle position of the rotor, the first optical fiber penetrating through the hollow rotating shaft in the horizontal direction, and a fastening device is provided on the hollow rotating shaft for fixing the other end of the first optical fiber.

[0010] According to some embodiments of the first aspect of the present invention, one end of the first optical fiber extending from the automatic optical fiber rotating table is connected with an optical fiber ring, and the optical fiber radius of the optical fiber ring is smaller than the radius of the first optical fiber.

[0011] According to some embodiments of the first aspect of the present invention, the end of the optical fiber ring is connected with an optical fiber attenuator.

[0012] According to some embodiments of the first aspect of the present invention, the spectral sensing array is formed by arranging a plurality of photoelectric sensors at a certain interval.

[0013] According to an optical fiber coding recognition system of the second aspect embodiment of the present invention, it includes a high-speed control processing chip, a light source, a circulator, a second optical fiber, and the optical fiber coding acquisition module. The high-speed control processing chip, the light source, and the circulator are sequentially connected to the second optical fiber. An optical fiber coding is provided on the second optical fiber. The first optical fiber of the optical fiber coding acquisition module is connected to the reflection output end of the circulator, and the optical fiber automatic rotating table and the spectral sensing array of the optical fiber coding acquisition module are respectively connected to the high-speed control processing chip.

[0014] According to an optical fiber coding recognition system of the second aspect embodiment of the present invention, it has at least the following beneficial effects: This solution uses the rotation of the automatic optical fiber rotating table to drive the twisting of the optical fiber of the fiber grating, thereby causing changes in the refractive angle reflection of the cladding and the core at the position of the optical fiber where the fiber grating is located, so that the reflected light wave of the fiber grating is transmitted from the cladding to the outside of the cladding, and then the transmitted light wave is collected and recognized by the spectral sensing array for the spectral characteristics of the light wave, thus getting rid of the constraints of devices such as mirrors, and having a simple structure and reduced cost.

[0015] According to some embodiments of the second aspect of the present invention, the optical fiber coding is composed of a plurality of fiber Bragg gratings with different central wavelengths or the same central wavelength.

[0016] The additional aspects and advantages of the present invention will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present invention. Description of the Drawings

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0018] Figure 1 This is a schematic diagram of the structure of a fiber optic coding acquisition module according to an embodiment of the first aspect of the present invention;

[0019] Figure 2 A cross-sectional view of a first optical fiber according to an embodiment of the first aspect of the present invention;

[0020] Figure 3a , 3b , 3c are schematic diagrams of reflection spectra of long period fiber grating, fiber Bragg grating, and phase-shifted fiber grating, respectively;

[0021] Figure 4 A schematic diagram of a fixing platform according to an embodiment of the first aspect of the present invention;

[0022] Figure 5 , Figure 6 , Figure 7 They are the front view, side view and top view of the optical fiber automatic rotating table respectively;

[0023] Figure 8 This is a schematic diagram of a fiber optic coding identification system according to an embodiment of the second aspect of the present invention. DETAILED DESCRIPTION

[0024] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0025] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0026] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0027] refer to Figure 1 As shown, a fiber optic coding acquisition module 100 according to the first aspect of the technical solution is provided, comprising

[0028] Base 110, which serves as the installation platform of the device and provides a hardware framework; and the following components provided on the base 110:

[0029] The first optical fiber 120, one end of which receives the input optical wave containing the encoded value. The first optical fiber 120 includes an internal core 121 and an external cladding 122. A fiber grating 123 is replicated on the core 121, as Figure 2 shown; the fiber grating 123 can axially reflect the corresponding wavelength. When the fiber grating 123 is distorted, the refraction angle between its core 121 and cladding 122 changes. When the refraction angle reaches a certain degree, the axially reflected optical wave diffracts and transmits through the cladding 122, becoming a transverse diffraction, and its diffraction spectrum is consistent with the reflection spectrum;

[0030] A fixing table 130 for fixing the first optical fiber 120 from one side of the fiber grating 123;

[0031] An optical fiber automatic rotating table 140 for fixing the first optical fiber 120 from the other side of the fiber grating 123 and rotating according to a control instruction to drive the fiber grating 123 to be distorted;

[0032] A spectral sensing array 150, which is positioned opposite to the fiber grating 123 for collecting the optical wave diffracted after the fiber grating 123 is distorted.

[0033] When the input optical wave containing the encoded value enters the first optical fiber 120, the rotation of the optical fiber automatic rotating table 140 is controlled to drive the distortion of the optical fiber of the fiber grating 123, thereby causing a change in the refraction angle reflection between the cladding 122 and the core 121 at the position of the optical fiber where the fiber grating 123 is located, so that the reflected optical wave of the fiber grating 123 transmits from the cladding 122 to the outside of the cladding 122, and then the transmitted optical wave is collected and identified by the spectral sensing array 150 for the spectral characteristics of the optical wave, thus getting rid of the constraints of devices such as mirrors, and having a simple structure and reduced cost.

[0034] In some embodiments of the first aspect of the present invention, the fiber grating 123 is a long-period fiber grating, a fiber Bragg grating or a phase-shifted fiber grating. Among them, the long-period fiber grating can reflect optical waves in a long wavelength band, the fiber Bragg grating can reflect optical waves in a narrow wavelength band, and the phase-shifted fiber grating can achieve reflection of two main wavelength bands at both ends within a certain wavelength band and sub-wavelengths evenly distributed within the main wavelength band, as Figure 3a 、 3b 、3c shown, which are the reflection spectra of the long-period fiber grating, the fiber Bragg grating and the phase-shifted fiber grating respectively. In view of the need to reflect a relatively wide wavelength band in this patent, the long-period fiber grating is preferably adopted in this embodiment.

[0035] Specifically, as Figure 4As shown, in some embodiments of the first aspect of the present invention, the fixing table 130 includes a fixing base 131, a fixing pressing piece 132, and a bolt (not shown). Corresponding positions of the fixing base 131 and the fixing pressing piece 132 are provided with screw holes 133 for locking the bolt. The first optical fiber 120 is threaded between the fixing base 131 and the fixing pressing piece 132 and clamped under the action of the bolt, mainly playing a role in fixing the first optical fiber 120 and facilitating a force point when the first optical fiber 120 is twisted.

[0036] Further, in some embodiments of the first aspect of the present invention, plastic gaskets 134 are provided on the opposite inner sides of the fixing base 131 and the fixing pressing piece 132 to protect the optical fiber from being pinched while fixing the optical fiber. The plastic gaskets 134 can also be replaced by other flexible materials to play the same fixing and protecting roles.

[0037] As Figures 5 to 7 shown, they are respectively the front view, side view, and top view of the optical fiber automatic rotating table 140. In some embodiments of the first aspect of the present invention, the optical fiber automatic rotating table 140 includes: a stator 141 fixed on the base 110; a rotor 142 oppositely arranged with the stator 141 in the vertical direction; a hollow rotating shaft 143 sleeved in the middle position of the rotor 142. The first optical fiber 120 penetrates through the hollow rotating shaft 143 from the horizontal direction, and a fastening device 144 is provided on the hollow rotating shaft 143 for fixing the other end of the first optical fiber 120.

[0038] After the rotor 142 is powered on, an electromagnetic field is generated, and it rotates under the magnetic force between the stators 141, driving the sleeved hollow rotating shaft 143 to rotate. And the first optical fiber 120 can rotate synchronously with the hollow rotating shaft 143 under the action of the fastening device 144, thereby driving the fiber grating 123 to twist. It should be noted that, in order to save the mold opening cost, the fastening device 144 in this embodiment adopts the same structure as the fixing table 130, that is, including structures such as a fixing pressing piece 132, a bolt, and a screw hole 133.

[0039] Further, in some embodiments of the first aspect of the present invention, one end of the first optical fiber 120 extending out of the optical fiber automatic rotating table 140 is connected to an optical fiber loop 160. The optical fiber radius of the optical fiber loop 160 is smaller than the radius of the first optical fiber 120. This design can achieve the attenuation of the light wave end and avoid the light wave reflection, causing interference to the reflection of the fiber grating 123.

[0040] In addition, in some embodiments of the first aspect of the present invention, the end of the optical fiber loop 160 is connected to an optical fiber attenuator 170 to further increase the optical fiber loss on the basis of the optical fiber loop 160.

[0041] In some embodiments of the first aspect of the present invention, the spectral sensing array 150 is formed by arranging a plurality of photoelectric sensors at a certain interval to convert the light intensity of light waves into electrical signals. When the fiber grating 123 rotates to a certain position, the light wave transmitted after the fiber grating 123 is distorted is input into the spectral sensing array 150. The fiber grating 123 can diffract and transmit the spectrum evenly through the cladding 122 and input it into the spectral sensing array 150. Different wavelengths are incident on different photoelectric sensors of the spectral sensing array 150 to collect the light wave intensities of different wavelengths.

[0042] As Figure 8 shown, a fiber optic code 510 identification system according to an embodiment of the second aspect of the present invention includes: a high-speed control processing chip 200, a light source 300, a circulator 400, a second optical fiber 500, and the fiber optic code 510 acquisition module 100. The high-speed control processing chip 200, the light source 300, and the circulator 400 are sequentially connected to the second optical fiber 500. The fiber optic code 510 is provided on the second optical fiber 500. The first optical fiber 120 of the fiber optic code 510 acquisition module 100 is connected to the reflection output end of the circulator 400. The fiber optic automatic rotation stage 140 and the spectral sensing array 150 of the fiber optic code 510 acquisition module 100 are respectively connected to the high-speed control processing chip 200.

[0043] Since the intensity of the diffracted light wave is the largest when the distortion angle reaches the critical value, and when it is less than or exceeds the critical value, the intensity of its diffracted light wave will gradually decrease. Therefore, the distortion angle of the fiber grating 123 needs to be initialized and adjusted to achieve the maximum light intensity diffraction of the fiber grating 123. The light wave output point of the circulator 400 uses a terminated end, and the end will totally reflect all light waves. When the light source 300 sends pulsed light waves according to requirements, the light waves are output to the end through the circulator 400. The end totally reflects the light waves and outputs them to the fiber optic code 510 acquisition module 100 through the circulator 400. The fiber optic code 510 acquisition module 100 collects spectral information including wavelength and energy. The fiber optic code 510 acquisition module 100 rotates the rotor 142 step by step according to the control instruction of the high-speed control processing chip 200 to distort the fiber grating 123, and then sends light waves and collects spectral information. The rotor 142 is gradually rotated and spectral information is collected until the intensity of the collected spectral information is the largest, which is the optimal rotation angle, and this angle is fixed.

[0044] During operation, the high-speed control processing chip 200 controls the light source 300 to output pulsed light waves. The pulsed light waves are transmitted through the circulator 400 to the optical fiber coding 510 of the second optical fiber 500. The optical fiber coding 510 reflects the light waves with specific wavelengths and coding values and enters the fiber grating 123 of the first optical fiber 120 through the circulator 400. For the fiber grating 123 in a twisted state, due to the refractive angle reflection changes of the cladding 122 and the core 121 at the position of the optical fiber where the fiber grating 123 is located, the reflected light waves of the fiber grating 123 are transmitted from the cladding 122 to the outside of the cladding 122. Then, the transmitted light waves are collected by the spectral sensing array 150 for the spectral characteristics of the light waves, and then fed back to the high-speed control processing chip 200 for wavelength and light intensity identification, thus getting rid of the constraints of devices such as mirrors, and having a simple structure and reduced cost.

[0045] In some embodiments of the second aspect of the present invention, the optical fiber coding 510 is composed of multiple fiber Bragg gratings with different center wavelengths or the same center wavelength, and can reflect light waves with corresponding wavelengths and coding values.

[0046] In the description of this specification, the descriptions with reference to the terms "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0047] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. An optical fiber coding acquisition module, characterized in that: Comprising: A base; And a first optical fiber disposed on the base, wherein a fiber grating is provided on the first optical fiber; the first optical fiber includes a core inside and a cladding outside, and the fiber grating is replicated on the core; A fixing table for fixing the first optical fiber from one side of the fiber grating; An optical fiber automatic rotating table for fixing the first optical fiber from the other side of the fiber grating and rotating according to a control instruction to drive the fiber grating to be distorted, thereby causing changes in the refractive angles of the cladding and the core at the position of the optical fiber where the fiber grating is located, so that the reflected light wave of the fiber grating is transmitted from the cladding to the outside of the cladding; A spectral sensing array, corresponding to the position of the fiber grating for collecting the light wave diffracted after the fiber grating is distorted.

2. The optical fiber coding acquisition module according to claim 1, characterized in that: The fiber grating is a long-period fiber grating, a fiber Bragg grating or a phase-shifted fiber grating.

3. The optical fiber coding acquisition module according to claim 1 or 2, characterized in that: The fixing table includes a fixing base, a fixing pressing piece and a bolt. Corresponding positions of the fixing base and the fixing pressing piece are provided with screw holes for locking the bolt. The first optical fiber passes through between the fixing base and the fixing pressing piece and is clamped under the action of the bolt.

4. The optical fiber coding acquisition module according to claim 3, characterized in that: Plastic gaskets are provided on both inner sides of the fixing base and the fixing pressing piece that face each other.

5. The optical fiber coding acquisition module according to claim 1 or 2, characterized in that: The optical fiber automatic rotating table includes: A stator fixed to the base; A rotor oppositely arranged with the stator in the vertical direction; A hollow rotating shaft sleeved in the middle position of the rotor. The first optical fiber passes through the hollow rotating shaft horizontally, and a fastening device is provided on the hollow rotating shaft for fixing the other end of the first optical fiber.

6. The optical fiber coding acquisition module according to claim 1 or 2, characterized in that: One end of the first optical fiber extending out of the optical fiber automatic rotating table is connected with an optical fiber loop, and the optical fiber radius of the optical fiber loop is smaller than the radius of the first optical fiber.

7. The optical fiber coding acquisition module according to claim 6, characterized in that: The end of the optical fiber loop is connected with an optical fiber attenuator.

8. The optical fiber coding acquisition module according to claim 1, characterized in that: The spectral sensing array is formed by arranging a plurality of photoelectric sensors at a certain interval.

9. An optical fiber coding identification system, characterized in that: Comprising a high-speed control processing chip, a light source, a circulator, a second optical fiber and an optical fiber coding acquisition module according to any one of claims 1 to 8. The high-speed control processing chip, the light source, the circulator and the second optical fiber are connected in sequence. A fiber coding is provided on the second optical fiber. The first optical fiber of the optical fiber coding acquisition module is connected to the reflection output end of the circulator. The optical fiber automatic rotating table and the spectral sensing array of the optical fiber coding acquisition module are respectively connected to the high-speed control processing chip.

10. The optical fiber coding identification system according to claim 9, characterized in that: The fiber coding is composed of a plurality of fiber Bragg gratings with different central wavelengths or the same central wavelength.

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