CN115795232A - Method for calculating cutting length of tail fiber of optical fiber loop, electronic device and storage medium - Google Patents
Method for calculating cutting length of tail fiber of optical fiber loop, electronic device and storage medium Download PDFInfo
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Abstract
The invention relates to the technical field of optical fiber loop manufacturing, and provides a method for calculating the cutting length of a tail fiber of an optical fiber loop, electronic equipment and a storage medium. The method for calculating the cutting length of the tail fiber of the optical fiber loop comprises the following steps of S10, determining basic parameters of the optical fiber loop and the central offset of the optical fiber loop; s20, calculating the angular rate error of the optical fiber loop according to a Shupe error equation; s30, establishing a discretization error model of each layer of optical fiber ring according to the symmetrical winding characteristics and the temperature field distribution characteristics; s40, setting the angular rate error of the optical fiber loop to be zero, and calculating the cutting length of the tail fiber of the optical fiber loop. According to the invention, the cutting length of the tail fiber of the optical fiber loop is obtained through calculation, the defects of blindness and low precision of cutting the tail fiber are effectively overcome, the preparation precision, the success rate and the process applicability of the optical fiber loop are improved, the temperature performance of the optical fiber gyroscope is further improved, and the measurement precision performance of the optical fiber gyroscope is ensured.
Description
Technical Field
The invention relates to the technical field of fiber-optic gyroscope manufacturing, in particular to a method for calculating the cutting length of a tail fiber of an optical fiber loop, electronic equipment and a storage medium.
Background
The fiber optic gyroscope is an optical fiber angular rate sensor based on the Sagnac effect, has the advantages of small volume, high precision, all solid state, long service life, large dynamic range and the like, and the strapdown inertial navigation system based on the fiber optic gyroscope is widely applied to the fields of aerospace, naval vessel navigation and the like.
The optical fiber loop is used as a sensitive core in the optical fiber gyroscope, and the performance of the optical fiber loop directly influences the precision of the gyroscope. When the environmental factors of the optical fiber loop change, two light waves which are reversely transmitted in the optical fiber loop generate nonreciprocal phase difference, the nonreciprocal phase shift and the Sagnac phase shift caused by the angular velocity cannot be separated in the demodulation process, the accuracy of the sensitive angular velocity of the loop is directly influenced, and the fundamental reason of the nonreciprocal error is that the stress distribution of the optical fiber sensitive loop is asymmetric, so that the phase shift of the loop is changed.
In the process of winding the optical fiber ring, the optical fiber ring is usually wound from an inner layer to an outer layer, particularly, the inner layer is solidified and then wound on the outer layer by adopting a gluing process, the optical fiber on the inner layer cannot be adjusted usually, and the symmetry of the whole ring can be directly changed by changing the length of the last layer of tail fiber.
The existing method of simply cutting the tail fiber by experiment has certain blindness and heuristics, even if a better result is obtained, time is consumed, the precision is not high, and the process is difficult to popularize; especially, high accuracy fiber optic gyroscope, because the butt fusion error or in order to cooperate the whole circle condition of coiling the diameter at the assembly in process, in case the butt fusion fails, when the butt fusion, either cut out minimum (cutter scissors difference), or, both ends tail fiber all cuts out whole circle and welds again, has proposed huge complexity to the butt fusion assembly process.
Disclosure of Invention
The invention provides a method for calculating the cutting length of a tail fiber of an optical fiber loop, electronic equipment and a storage medium, which are used for solving the defect of low cutting precision of the optical fiber loop in the prior art, improving the cutting precision of the tail fiber of the optical fiber loop and improving the performance of an optical fiber gyroscope.
The invention provides a method for calculating the cutting length of a tail fiber of an optical fiber loop, which comprises the following steps:
s10, determining basic parameters of the optical fiber loop and the central offset of the optical fiber loop;
s20, establishing an angular rate error calculation formula of the optical fiber loop according to a Shupe error equation by taking the basic parameters of the optical fiber loop and the central offset of the optical fiber loop obtained in the step S10 as data bases;
s30, establishing a discretization error model of each layer of the optical fiber loop according to the symmetrical winding characteristics and the temperature field distribution characteristics and the basic parameters of the optical fiber loop obtained in the step S10, and combining the discretization error model of each layer of the optical fiber loop with the angular rate error calculation formula of the optical fiber loop obtained in the step S20;
s40, setting the angular rate error of the optical fiber loop to be zero, and calculating the cutting length of the tail fiber of the optical fiber loop.
According to the method for calculating the cutting length of the tail fiber of the optical fiber loop, in the step S10, the basic parameters include the number of layers of the optical fiber loop, the average diameter of the optical fiber loop, the thickness of each layer of the optical fiber loop, the total length of the optical fiber loop and the local refractive index of the optical fiber loop.
According to the method for calculating the cutting length of the tail fiber of the optical fiber loop, in the step S20, the angular rate error
The calculation formula of (A) is as follows:
wherein D is the average diameter of the optical fiber loop;
l is the total length of the optical fiber loop;
n represents the local refractive index of the optical fiber loop;
l-2z represents a position factor of the z point of the optical fiber loop relative to the middle point of the optical fiber loop;
z is the position of any point on the optical fiber loop.
According to the method for calculating the cutting length of the tail fiber of the optical fiber loop, in the step S30, the symmetric winding characteristics of the optical fiber loop include that the outer winding weight of the optical fiber loop is greater than the inner winding weight of the optical fiber loop, and the symmetry error of the optical fiber loop is equivalent to the length symmetry error of the optical fiber loop, then:
wherein the content of the first and second substances,
the temperature change rate of the z point of the optical fiber loop at the time t;
l-2z represents the position factor of the z-point of the fiber loop relative to the midpoint of the fiber loop.
According to the method for calculating the cutting length of the tail fiber of the optical fiber loop, in the step S30, the distribution characteristics of the temperature field include that the temperature field is linearly distributed from the inner side to the outer side of the optical fiber loop, and the temperature field of each layer of the optical fiber loop is a fixed value, so that the temperature difference between the inner layer and the outer layer of the optical fiber loop is as follows:
wherein the content of the first and second substances,
t is a temperature field at z and T;
i is a continuous number of a single side on the left side of the fiber-optic gyroscope, i =1,2,3 … N;
n is the number of layers of the optical fiber ring;
According to the method for calculating the cutting length of the tail fiber of the optical fiber loop, the step S40 is to calculate the cutting length
Comprises the following steps:
wherein D is the average diameter of the optical fiber loop;
l is the total length of the optical fiber loop;
n represents the local refractive index of the optical fiber loop;
l-2z represents the position factor of the z-point fiber relative to the middle point of the fiber optic gyroscope loop.
The invention also provides an electronic device, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor executes the program to realize the steps of the method for calculating the cutting length of the tail fiber of the optical fiber loop.
The present invention also provides a non-transitory computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the method for calculating a cut length of a fiber loop pigtail according to any of the above.
The invention provides a method for calculating the cutting length of a tail fiber of an optical fiber loop, electronic equipment and a storage medium, which comprises the following steps of S10, determining basic parameters of the optical fiber loop and the central offset of the optical fiber loop; s20, establishing an angular rate error calculation formula of the optical fiber loop according to a Shupe error equation by taking the basic parameters of the optical fiber loop and the central offset of the optical fiber loop obtained in the step S10 as data bases; s30, establishing a discretization error model of each layer of the optical fiber loop according to the symmetrical winding characteristics, the temperature field distribution characteristics and the basic parameters of the optical fiber loop obtained in the step S10, and combining the discretization error model of each layer of the optical fiber loop with the angular rate error calculation formula of the optical fiber loop obtained in the step S20; s40, setting the angular rate error of the optical fiber loop to be zero, calculating the cutting length of the tail fiber of the optical fiber loop, obtaining the cutting length of the tail fiber of the optical fiber loop through calculation, effectively overcoming the defects of blindness and low precision of cutting the tail fiber, improving the preparation precision, the success rate and the process applicability of the optical fiber loop, further improving the temperature performance of the optical fiber gyroscope, and ensuring the measurement precision performance of the optical fiber gyroscope.
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
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a block diagram schematically illustrating a method for calculating a cut length of a tail fiber of an optical fiber loop according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The following describes a method for calculating the cutting length of the tail fiber of the optical fiber loop, which comprises the following steps:
s10, determining basic parameters of the optical fiber loop and the central offset of the optical fiber loop;
s20, establishing an angular rate error calculation formula of the optical fiber loop according to a Shupe error equation by taking the basic parameters of the optical fiber loop and the central offset of the optical fiber loop obtained in the step S10 as data bases;
s30, establishing a discretization error model of each layer of the optical fiber loop according to the symmetrical winding characteristics, the temperature field distribution characteristics and the basic parameters of the optical fiber loop obtained in the step S10, and combining the discretization error model of each layer of the optical fiber loop with the angular rate error calculation formula of the optical fiber loop obtained in the step S20;
s40, setting the angular rate error of the optical fiber loop to be zero, and calculating the cutting length of the tail fiber of the optical fiber loop.
According to the method for calculating the cutting length of the tail fiber of the optical fiber loop, in the step S10, the basic parameters include the number of layers of the optical fiber loop, the average diameter of the optical fiber loop, the thickness of each layer of the optical fiber loop, the total length of the optical fiber loop and the local refractive index of the optical fiber loop.
According to the method for calculating the cutting length of the tail fiber of the optical fiber loop, in the step S20, the angular rate error
The calculation formula of (A) is as follows:
wherein D is the average diameter of the optical fiber loop;
l is the total length of the optical fiber loop;
n represents the local refractive index of the optical fiber loop;
l-2z represents a position factor of the z point of the optical fiber loop relative to the middle point of the optical fiber loop;
z is the position of any point on the optical fiber loop.
According to the method for calculating the cutting length of the tail fiber of the optical fiber loop, in the step S30, the symmetric winding characteristics of the optical fiber loop include that the outer winding weight of the optical fiber loop is greater than the inner winding weight of the optical fiber loop, and the symmetry error of the optical fiber loop is equivalent to the length symmetry error of the optical fiber loop, then:
wherein the content of the first and second substances,
the temperature change rate of the z point of the optical fiber loop at the time t;
l-2z represents the position factor of the z-point of the fiber loop relative to the midpoint of the fiber loop.
According to the method for calculating the cutting length of the tail fiber of the optical fiber loop, in the step S30, the distribution characteristics of the temperature field include that the temperature field is linearly distributed from the inner side to the outer side of the optical fiber loop, and the temperature field of each layer of the optical fiber loop is a fixed value, so that the temperature difference between the inner layer and the outer layer of the optical fiber loop is as follows:
wherein the content of the first and second substances,
;
t is a temperature field at z and T;
i is a continuous number of a single side on the left side of the fiber-optic gyroscope, i =1,2,3 … N;
n is the number of layers of the optical fiber ring;
According to the method for calculating the cutting length of the tail fiber of the optical fiber loop, the step S40 is to calculate the cutting length
Comprises the following steps:
wherein D is the average diameter of the optical fiber loop;
l is the total length of the optical fiber loop;
n represents the local refractive index of the optical fiber loop;
l-2z represents the position factor of the z-point fiber relative to the mid-point of the fiber optic gyroscope loop.
The method for calculating the cutting length of the tail fiber of the optical fiber loop comprises the following steps:
s10, determining basic parameters of the optical fiber loop, wherein the basic parameters comprise the number of layers of the optical fiber loop, the average diameter of the optical fiber loop, the thickness of each layer of the optical fiber loop, the total length of the optical fiber loop and the local refractive index of the optical fiber loop; and determining the central offset of the optical fiber loop caused by asymmetry in the winding preparation process
/2；
It should be noted that, in the present embodiment, the optical fiber loop is manufactured by a quadrupole symmetric winding method, but the method provided by the present invention is applicable to an optical fiber loop manufactured by an octupole symmetric winding method, a sixteen pole symmetric winding method, or a symmetric winding method with a higher number of poles.
S20, taking the basic parameters of the optical fiber loop and the central offset of the optical fiber loop obtained in the step S10 as data bases, performing integration in positive and negative directions by taking the middle point as an origin according to a Shupe error equation to obtain a continuity integral equation, and calculating the thermally induced nonreciprocal angular rate error of the optical fiber loop caused by the Shupe error, wherein the calculation formula is as follows:
wherein D is the average diameter of the optical fiber loop;
l is the total length of the optical fiber loop;
n represents the local refractive index of the optical fiber loop;
l-2z represents a position factor of the z point of the optical fiber loop relative to the middle point of the optical fiber loop;
s30, establishing a discretization error model of each layer of the optical fiber loop according to the symmetrical winding characteristics, the temperature field distribution characteristics and the basic parameters of the optical fiber loop obtained in the step S10, and combining the discretization error model of each layer of the optical fiber loop with the angular rate error calculation formula of the optical fiber loop obtained in the step S20; the symmetric winding characteristics comprise that the outer winding weight of the optical fiber loop is greater than the inner winding weight, and meanwhile, the symmetry error of the optical fiber loop is equivalent to the symmetry error of the length of the optical fiber loop, so that the acceleration rate error can be calculated
The transformation yields:
further, setting
Setting for forward coordinate increments of the fiber loop
For reverse coordinate increments of the fiber loop, for
In other words, let
Starting from the mid-point of the loop
Since the position is the same as the position indicated by z, the temperature field is the same, and further:
in the same way, set
And then:
and further:
the calculation formula of the angular rate error sensitive to the optical fiber loop is as follows:
wherein, the temperature field distribution characteristic specifically means that the temperature field is linear distribution from the inboard of optic fibre ring to the outside, and the temperature field of every layer of optic fibre ring is the definite value, and then the temperature difference between the inside and outside adjacent layer of optic fibre ring is:
wherein the content of the first and second substances,
;
t is a temperature field at z and T;
i is a serial number of a single left side, i =1,2,3 … N;
n is the number of layers of the optical fiber ring; in this embodiment, N is an integer multiple of 4;
substituting into the calculation formula of the angular rate sensitive to the optical fiber ring as follows:
s40, setting the angular rate error of the optical fiber loop to be zero, and obtaining the cutting length of the tail fiber of the optical fiber loop caused by drift through inverse solution calculation
The calculation formula is:
that is, when the total length of the optical fiber loop, the time-varying rate of the temperature field, and the angular rate error of the optical fiber loop are known, the error of the optical fiber loop can be compensated by increasing or decreasing the length of the optical fiber loop, the symmetric midpoint of the optical fiber loop is compensated to 0, and the drift error of the optical fiber loop with temperature is compensated to zero.
Wherein, if
The calculation result is positive value, which represents cutting the left tail fiber of the optical fiber loop if
Negative values represent the left-hand pigtail of the trimmed fiber loop.
The method aims to calculate the equivalent tail fiber length error according to the previous analysis result before the outermost layer is cured during the preparation of the optical fiber ring, cut or lengthen the tail fiber according to the length error, and finally finish the outer layer curing.
The present invention also provides an electronic device, which may include: the system comprises a processor (processor), a communication Interface (communication Interface), a memory (memory) and a communication bus, wherein the processor, the communication Interface and the memory are communicated with each other through the communication bus. The processor may invoke logic instructions in the memory to perform a fiber loop pigtail cut length calculation method.
In addition, the logic instructions in the memory may be implemented in the form of software functional units and may be stored in a computer readable storage medium when sold or used as a stand-alone product. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk, and various media capable of storing program codes.
In another aspect, the present invention also provides a computer program product comprising a computer program stored on a non-transitory computer-readable storage medium, the computer program comprising program instructions, which when executed by a computer, enable the computer to perform the method for calculating the cutting length of the tail fiber of the optical fiber loop provided by the above methods.
In yet another aspect, the present invention further provides a non-transitory computer-readable storage medium, on which a computer program is stored, the computer program being implemented by a processor to execute the methods for calculating the fiber loop tail fiber cutting length provided in the above embodiments.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
The invention provides a method for calculating the cutting length of a tail fiber of an optical fiber loop, electronic equipment and a storage medium, which comprises the following steps of S10, determining the basic parameters of the optical fiber loop and the central offset of the optical fiber loop; s20, establishing an angular rate error calculation formula of the optical fiber loop according to a Shupe error equation by taking the basic parameters of the optical fiber loop and the central offset of the optical fiber loop obtained in the step S10 as data bases; s30, establishing a discretization error model of each layer of the optical fiber loop according to the symmetrical winding characteristics, the temperature field distribution characteristics and the basic parameters of the optical fiber loop obtained in the step S10, and combining the discretization error model of each layer of the optical fiber loop with the angular rate error calculation formula of the optical fiber loop obtained in the step S20; s40, setting the angular rate error of the optical fiber loop to be zero, calculating the cutting length of the tail fiber of the optical fiber loop, obtaining the cutting length of the tail fiber of the optical fiber loop through calculation, effectively overcoming the defects of blindness and low precision of cutting the tail fiber, improving the preparation precision, the success rate and the process applicability of the optical fiber loop, further improving the temperature performance of the optical fiber gyroscope, and ensuring the measurement precision performance of the optical fiber gyroscope.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. A method for calculating the cutting length of a tail fiber of an optical fiber loop is characterized by comprising the following steps:
s10, determining basic parameters of the optical fiber loop and the central offset of the optical fiber loop;
s20, establishing an angular rate error calculation formula of the optical fiber loop according to a Shupe error equation by taking the basic parameters of the optical fiber loop and the central offset of the optical fiber loop obtained in the step S10 as data bases;
s30, establishing a discretization error model of each layer of the optical fiber loop according to the symmetrical winding characteristics and the temperature field distribution characteristics and the basic parameters of the optical fiber loop obtained in the step S10, and combining the discretization error model of each layer of the optical fiber loop with the angular rate error calculation formula of the optical fiber loop obtained in the step S20;
s40, setting the angular rate error of the optical fiber loop to be zero, and calculating the cutting length of the tail fiber of the optical fiber loop.
2. The method for calculating the trimmed length of the tail fiber of the optical fiber loop according to claim 1, wherein in the step S10, the basic parameters include the number of layers of the optical fiber loop, the average diameter of the optical fiber loop, the thickness of each layer of the optical fiber loop, the total length of the optical fiber loop and the local refractive index of the optical fiber loop.
3. The method of claim 2, wherein in step S20, the angular rate error is calculated
The calculation formula of (A) is as follows:
wherein, the first and the second end of the pipe are connected with each other,Dis the average diameter of the optical fiber loop;
Lthe total length of the optical fiber loop;
nrepresenting the local refractive index of the optical fiber loop;
L-2zrepresenting loops of optical fibrezA position factor of the point relative to a midpoint of the fiber loop;
z is the position of any point on the optical fiber loop.
4. The method for calculating the cutting length of the tail fiber of the optical fiber loop according to claim 3, wherein in the step S30, the symmetric winding characteristics of the optical fiber loop include that the outer winding weight of the optical fiber loop is greater than the inner winding weight of the optical fiber loop, and the symmetry error of the optical fiber loop is equivalent to the length symmetry error of the optical fiber loop, then:
5. the method according to claim 4, wherein in the step S30, the temperature field distribution characteristics include a linear distribution of the temperature field from the inner side to the outer side of the optical fiber loop, and the temperature field of each layer of the optical fiber loop is constant, so that the temperature difference between the inner layer and the outer layer of the optical fiber loop is:
wherein the content of the first and second substances,
;
Nthe number of layers of the optical fiber loop;
Tis composed ofzAt the position of the air compressor, the air compressor is started,ta temperature field at a time;
iis a serial number of a single side at the left side of the fiber-optic gyroscope,i=1,2,3…N。
6. the method for calculating the trimmed length of the tail fiber of the optical fiber loop according to claim 5, wherein the step S40 is to calculate the trimmed length
Comprises the following steps:
7. an electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor executes the program to implement the steps of the method of calculating the cut length of an optical fiber loop pigtail according to any of claims 1 to 6.
8. A storage medium having stored thereon a computer program for implementing the steps of the method for calculating the cut length of a fiber loop pigtail according to any of claims 1 to 6 when executed by a processor.
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