CN114199378B - A fiber optic coding acquisition module and identification system - Google Patents
A fiber optic coding acquisition module and identification system Download PDFInfo
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- CN114199378B CN114199378B CN202111504134.3A CN202111504134A CN114199378B CN 114199378 B CN114199378 B CN 114199378B CN 202111504134 A CN202111504134 A CN 202111504134A CN 114199378 B CN114199378 B CN 114199378B
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Abstract
本发明公开了一种光纤编码采集模块及识别系统，光纤编码采集模块，包括：基座；第一光纤，第一光纤上设置有光纤光栅；固定台，用于从光纤光栅的一侧固定第一光纤；光纤自动转动台，用于从光纤光栅的另一侧固定第一光纤，并根据控制指令进行转动以带动光纤光栅发生扭曲；光谱传感阵列，与光纤光栅的位置相对应以用于采集光纤光栅发生扭曲后衍射出的光波。本方案利用光纤自动转动台的旋转来带动光纤光栅的光纤扭曲，进而造成光纤光栅所在光纤位置的包层和纤芯折射角反射变化，使得光纤光栅反射光波从包层处透射至包层外，再将透射光波经光谱传感阵列将光波光谱特性进行采集和识别，从而摆脱反射镜等器件的束缚，并且结构简单、成本降低。
The present invention discloses a fiber coding acquisition module and identification system. The fiber coding acquisition module includes: a base; a first optical fiber, on which a fiber grating is arranged; a fixing table, used to fix the first optical fiber from one side of the fiber grating; an optical fiber automatic rotating table, used to fix the first optical fiber from the other side of the fiber grating, and rotate according to a control instruction to drive the fiber grating to twist; a spectrum sensing array, corresponding to the position of the fiber grating, for collecting light waves diffracted after the fiber grating is twisted. This scheme uses the rotation of the optical fiber automatic rotating table to drive the fiber grating to twist, thereby causing the cladding and core refraction angle reflection change at the optical fiber position where the fiber grating is located, so that the fiber grating reflected light wave is transmitted from the cladding to the outside of the cladding, and then the spectral characteristics of the light wave are collected and identified by the spectral sensing array, thereby getting rid of the constraints of devices such as reflectors, and having a simple structure and low cost.
Description
Technical Field
The invention relates to the field of optical fiber communication, in particular to an optical fiber coding acquisition module and an identification system.
Background
The conventional optical fiber coding identification mainly relies on a diffraction grating device to separate light waves, and the separated light waves are subjected to photoelectric conversion and acquisition by a photoelectric conversion array, so that the spectral identification of optical fiber coding reflected light waves is realized. However, the diffraction grating device is expensive, needs the assistance of devices such as a reflector, and has high cost and complex structure.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the optical fiber coding acquisition module and the identification system provided by the invention can be free from the constraint of devices such as a reflector, and are simple in structure and low in cost.
The optical fiber coding acquisition module comprises a base, a first optical fiber arranged on the base, a fixing table used for fixing the first optical fiber from one side of the optical fiber grating, an optical fiber automatic rotating table used for fixing the first optical fiber from the other side of the optical fiber grating and rotating according to a control instruction so as to drive the optical fiber grating to twist, and a spectrum sensing array corresponding to the position of the optical fiber grating and used for acquiring light waves derived from the optical fiber grating after the optical fiber grating is twisted.
The optical fiber coding acquisition module has the advantages that the optical fiber of the optical fiber grating is driven to twist by utilizing the rotation of the optical fiber automatic rotating table, so that the reflection change of the refraction angles of the cladding and the fiber core at the optical fiber position of the optical fiber grating is caused, reflected light waves of the optical fiber grating are transmitted to the outside of the cladding from the cladding, and the transmitted light waves are acquired and identified through the spectrum sensing array, so that the constraint of devices such as a reflector is eliminated, the structure is simple, and the cost is reduced.
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.
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, the fixing base and the fixing pressing piece are provided with screw holes at corresponding positions for locking the bolt, and the first optical fiber is inserted between the fixing base and the fixing pressing piece and clamped under the action of the bolt.
According to some embodiments of the first aspect of the present invention, plastic gaskets are disposed on two opposite inner sides of the fixing base and the fixing pressing piece.
According to some embodiments of the first aspect of the present invention, the optical fiber automatic rotation table includes a stator fixed on the base, a rotor disposed opposite to the stator in a vertical direction, and a hollow rotation shaft sleeved in a middle position of the rotor, wherein the first optical fiber penetrates through the hollow rotation shaft from a horizontal direction, and a fastening device is disposed on the hollow rotation shaft for fixing the other end of the first optical fiber.
According to some embodiments of the first aspect of the present invention, an end of the first optical fiber extending from the optical fiber automatic rotation table is connected to an optical fiber ring, and an optical fiber radius of the optical fiber ring is smaller than a radius of the first optical fiber.
According to some embodiments of the first aspect of the invention, an optical fiber attenuator is connected to an end of the optical fiber ring.
According to some embodiments of the first aspect of the present invention, the spectrum sensing array is formed by arranging a plurality of photosensors at a certain pitch.
According to the second aspect of the invention, the optical fiber code identification system comprises a high-speed control processing chip, a light source, a circulator, a second optical fiber and the optical fiber code acquisition module, wherein the high-speed control processing chip, the light source, the circulator and the second optical fiber are sequentially connected, the second optical fiber is provided with an optical fiber code, the first optical fiber of the optical fiber code acquisition module and the reflection output end of the circulator, and an optical fiber automatic rotating table and a spectrum sensing array of the optical fiber code acquisition module are respectively connected with the high-speed control processing chip.
The optical fiber coding identification system has the advantages that the optical fiber of the optical fiber grating is driven to twist by the rotation of the optical fiber automatic rotating table, so that reflection changes of refraction angles of the cladding and the fiber core of the optical fiber where the optical fiber grating is located are caused, reflected light waves of the optical fiber grating are transmitted to the outside of the cladding from the cladding, and the transmitted light waves are collected and identified through the spectrum sensing array, so that the constraint of devices such as a reflector is eliminated, the structure is simple, and the cost is reduced.
According to some embodiments of the second aspect of the invention, the optical fiber code is composed of a plurality of fiber bragg gratings of different center wavelengths or the same center wavelength.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic diagram of a fiber code acquisition module according to an embodiment of the first aspect of the present invention;
FIG. 2 is a first fiber optic cross-section of an embodiment of the first aspect of the present invention;
FIGS. 3a, 3b, and 3c are schematic diagrams of reflection spectra of a long period fiber grating, a fiber Bragg grating, and a phase shift fiber grating, respectively;
FIG. 4 is a schematic view of a stationary table according to an embodiment of the first aspect of the present invention;
FIGS. 5, 6 and 7 are front, side and top views, respectively, of an automatic fiber optic turret;
fig. 8 is a schematic diagram of a fiber code identification system according to an embodiment of the second aspect of the present invention.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
In the description of the present invention, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present invention and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
In the description of the present invention, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present invention can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.
Referring to fig. 1, an optical fiber code acquisition module 100 according to an embodiment of the first aspect of the present application includes
Base 110, base 110 serving as a mounting platform for the device, providing a hardware frame, and disposed on base 110:
One end of the first optical fiber 120 receives an input optical wave containing a coded value, the first optical fiber 120 comprises an inner fiber core 121 and an outer cladding 122, a fiber bragg grating 123 is carved on the fiber core 121, as shown in fig. 2, and the fiber bragg grating 123 can axially reflect a corresponding wavelength. When the fiber grating 123 is twisted, the refraction angle between the fiber core 121 and the cladding 122 changes, and when the refraction angle reaches a certain degree, the axial reflected light wave is diffracted and then transmitted out of the cladding 122 to become transverse diffraction, and the diffraction spectrum is consistent with the reflection spectrum;
a fixing stage 130 for fixing the first optical fiber 120 from one side of the fiber grating 123;
An optical fiber automatic rotation table 140, configured to fix the first optical fiber 120 from the other side of the optical fiber grating 123, and rotate according to a control instruction to drive the optical fiber grating 123 to twist;
The spectrum sensing array 150 corresponds to the position of the fiber grating 123 and is used for collecting the light waves diffracted after the fiber grating 123 is twisted.
When the input light wave containing the encoded value enters the first optical fiber 120, the rotation of the optical fiber automatic rotation table 140 is controlled to drive the optical fiber of the optical fiber grating 123 to twist, thereby causing the refraction angle reflection change of the cladding 122 and the fiber core 121 at the optical fiber position of the optical fiber grating 123, the optical fiber grating 123 reflects the light wave and transmits the light wave from the cladding 122 to the outside of the cladding 122, and then the transmitted light wave collects and identifies the spectral characteristics of the light wave through the spectral sensing array 150, so that the constraint of devices such as a reflector is eliminated, the structure is simple, and the cost is reduced.
In some embodiments of the first aspect of the present invention, the fiber bragg grating 123 is a long-period fiber bragg grating, a fiber bragg grating, or a phase-shift fiber bragg grating, where the long-period fiber bragg grating can reflect light waves in a long wavelength band, the fiber bragg grating can reflect light waves in a narrow wavelength band, and the phase-shift fiber bragg grating can reflect light waves in both main wavelength bands at two ends in one wavelength band and sub-wavelength equally divided in the main wavelength band, as shown in fig. 3a, 3b, and 3c, respectively, the reflection spectra of the long-period fiber bragg grating, the fiber bragg grating, and the phase-shift fiber bragg grating are preferably used for this embodiment because of the requirement of reflecting relatively wide wavelength bands in this patent.
Specifically, as shown in fig. 4, 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), where a screw hole 133 is formed at a position corresponding to the fixing base 131 and the fixing pressing piece 132 for locking the bolt, and the first optical fiber 120 is inserted between the fixing base 131 and the fixing pressing piece 132 and clamped under the action of the bolt, so as to mainly perform a fixing function on the first optical fiber 120, so that an application point is provided when the first optical fiber 120 is twisted.
Further, in some embodiments of the first aspect of the present invention, plastic gaskets 134 are disposed on two opposite inner sides of the fixing base 131 and the fixing pressing piece 132, so as to protect the optical fiber from being pinched while fixing the optical fiber. The plastic spacer 134 may be replaced by other flexible materials for the same securing and protecting functions.
As shown in fig. 5 to 7, which are front view, side view and top view of the optical fiber automatic rotation table 140, in some embodiments of the first aspect of the present invention, the optical fiber automatic rotation table 140 includes a stator 141 fixed on the base 110, a rotor 142 disposed opposite to the stator 141 in a vertical direction, and a hollow rotation shaft 143 sleeved at a middle position of the rotor 142, wherein the first optical fiber 120 penetrates through the hollow rotation shaft 143 from a horizontal direction, and a fastening device 144 is disposed on the hollow rotation shaft 143 for fixing the other end of the first optical fiber 120.
After the rotor 142 is electrified, an electromagnetic field is generated, rotation is realized under the action of magnetic force between the stators 141, the hollow rotating shaft 143 sleeved on the rotor is driven to rotate, and the first optical fiber 120 can synchronously rotate with the hollow rotating shaft 143 under the action of the fastening device 144, so that the fiber bragg grating 123 is driven to twist. It should be noted that, in order to save the mold opening cost, the fastening device 144 of the present embodiment has the same structure as the fixing table 130, that is, includes the fixing presser 132, the bolt, the screw hole 133, and the like.
Further, in some embodiments of the first aspect of the present invention, an end of the first optical fiber 120 extending from the optical fiber automatic rotation table 140 is connected to an optical fiber ring 160, and a radius of the optical fiber ring 160 is smaller than a radius of the first optical fiber 120, so that attenuation of an end of an optical wave can be achieved, and reflection of the optical wave is avoided, which causes interference to reflection of the optical fiber grating 123.
Furthermore, in some embodiments of the first aspect of the present invention, the fiber attenuator 170 is connected to the end of the fiber optic ring 160, and further increases the fiber attenuation based on the fiber optic ring 160.
In some embodiments of the first aspect of the present invention, the spectrum sensing array 150 is formed by arranging a plurality of photoelectric sensors at a certain interval, so as to convert the light intensity of the light wave into an electrical signal, when the fiber bragg grating 123 rotates to a certain position, the fiber bragg grating 123 is twisted and then transmits the light wave to the spectrum sensing array 150, the fiber bragg grating 123 can transmit the diffraction of the uniform spectrum out of the cladding 122 to the spectrum sensing array 150, and different wavelengths are emitted to different photoelectric sensors of the spectrum sensing array 150, so as to collect the light wave intensities of different wavelengths.
As shown in fig. 8, an optical fiber code 510 identification system according to a 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 an optical fiber code 510 acquisition module 100, where the high-speed control processing chip 200, the light source 300, the circulator 400, and the second optical fiber 500 are sequentially connected, the second optical fiber 500 is provided with an optical fiber code 510, a first optical fiber 120 of the optical fiber code 510 acquisition module 100 and a reflective output end of the circulator 400, and an optical fiber automatic rotation stage 140 and a spectrum sensing array 150 of the optical fiber code 510 acquisition module 100 are respectively connected with the high-speed control processing chip 200.
Since the diffraction light wave intensity is maximum when the distortion angle reaches the critical value, the diffraction light wave intensity gradually decreases when the distortion angle is smaller than the critical value and exceeds the critical value. Therefore, the twist angle of the fiber grating 123 needs to be initialized and adjusted to achieve the maximum light intensity diffraction of the fiber grating 123, and the light wave output point of the circulator 400 adopts an end-formed end head, which can perform total reflection on all light waves. When the light source 300 sends pulse light waves according to the requirements, the light waves are output to the end head through the circulator 400, the end head total reflection light waves are output to the optical fiber code 510 acquisition module 100 through the circulator 400, the optical fiber code 510 acquisition module 100 acquires spectrum information including wavelength and energy, the optical fiber code 510 acquisition module 100 rotates the rotor 142 according to a certain step by step according to a control instruction of the high-speed control processing chip 200, so that the fiber bragg grating 123 is twisted, then sends the light waves and acquires the spectrum information, rotates the rotor 142 step by step and acquires the spectrum information until the intensity of the acquired spectrum information is the optimal rotation angle at maximum, and fixes the angle.
When the high-speed control processing chip 200 works, the high-speed control processing chip 200 controls the light source 300 to output a pulse light wave, the pulse light wave is transmitted to the optical fiber code 510 of the second optical fiber 500 through the circulator 400, the optical fiber code 510 reflects the light wave with specific wavelength and code value, the light wave enters the optical fiber grating 123 of the first optical fiber 120 through the circulator 400, the optical fiber grating 123 in a twisted state, due to the reflection change of refraction angles of the cladding 122 and the fiber core 121 at the optical fiber position of the optical fiber grating 123, the reflected light wave of the optical fiber grating 123 is transmitted to the outside of the cladding 122 from the position of the cladding 122, the transmitted light wave is collected through the spectrum sensing array 150, and the light wave spectrum characteristic is fed back to the high-speed control processing chip 200 for identifying the wavelength and the light intensity, so that the constraint of devices such as a reflecting mirror is eliminated, and the structure is simple and the cost is reduced.
In some embodiments of the second aspect of the present invention, the optical fiber code 510 is composed of a plurality of fiber bragg gratings with different center wavelengths or the same center wavelength, and may reflect light waves with corresponding wavelengths and code values.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents.
Claims (10)
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| CN114199378B true CN114199378B (en) | 2025-06-17 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20210131578A (en) * | 2020-04-24 | 2021-11-03 | 한국전력공사 | Apparatus for measuring twist using long period fiber grating based on polarization maintaining photonic crystal fiber |
| CN216524383U (en) * | 2021-12-09 | 2022-05-13 | 中山水木光华电子信息科技有限公司 | Optical fiber code acquisition module and identification system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6816260B2 (en) * | 2001-05-17 | 2004-11-09 | Thorlabs Gmbh | Fiber polarimeter, the use thereof, as well as polarimetric method |
| CN1287127C (en) * | 2003-12-08 | 2006-11-29 | 武汉理工大学 | Large capacity coding optical fiber grating sensing monitoring system |
| CA2504765C (en) * | 2004-04-14 | 2012-11-13 | Her Majesty The Queen In Right Of Canada, As Represented By The Minister Of Industry, Through The Communications Research Centre Canada | Optical fiber sensor based on retro-reflective fiber bragg gratings |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20210131578A (en) * | 2020-04-24 | 2021-11-03 | 한국전력공사 | Apparatus for measuring twist using long period fiber grating based on polarization maintaining photonic crystal fiber |
| CN216524383U (en) * | 2021-12-09 | 2022-05-13 | 中山水木光华电子信息科技有限公司 | Optical fiber code acquisition module and identification system |
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