CN212458395U - Fiber optic gyroscope with stress compensation - Google Patents
Fiber optic gyroscope with stress compensation Download PDFInfo
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- CN212458395U CN212458395U CN202021205910.0U CN202021205910U CN212458395U CN 212458395 U CN212458395 U CN 212458395U CN 202021205910 U CN202021205910 U CN 202021205910U CN 212458395 U CN212458395 U CN 212458395U
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Abstract
The application relates to a fiber-optic gyroscope with stress compensation, which is additionally provided with a temperature sensor and piezoelectric ceramics on the basis that the existing fiber-optic gyroscope comprises a light source, a coupler, a Y waveguide, a fiber-optic ring, a detector and a signal processing circuit. The coupler is respectively connected with the light source, the detector and the Y waveguide; the signal control circuit is respectively connected with the detector, the temperature sensor, the Y waveguide and the piezoelectric ceramic. The optical fiber ring is wound with the first optical fiber and the second optical fiber, the Y waveguide is connected with the optical fiber ring through the first optical fiber tail fiber and the second optical fiber tail fiber, and the first optical fiber tail fiber or the second optical fiber tail fiber is also wound on the piezoelectric ceramic. When the optical fiber gyroscope works, the signal processing circuit controls the piezoelectric ceramics to perform pressure compensation on the first optical fiber tail fiber or the second optical fiber tail fiber wound on the piezoelectric ceramics in real time according to the sensitive angular rate information and the temperature information of the optical fiber gyroscope, and stress values on two sides are balanced, so that zero drift of the optical fiber gyroscope caused by stress is compensated.
Description
Technical Field
The application relates to the technical field of angular rate sensors, in particular to a fiber-optic gyroscope with stress compensation.
Background
In the optical fiber ring manufacturing technology, generally, the middle point of one optical fiber is sequentially wound in the clockwise direction and the anticlockwise direction, and the stress in the optical fibers at two sides is not completely symmetrical due to inevitable introduction of additional stress interference in the process; furthermore, as the number of winding layers increases, the bending radius of the winding increases, and the average stress value inside each layer of optical fiber also changes. After the optical fiber ring is wound, the potting adhesive needs to be filled and cured for forming, and stress interference can be introduced by curing the potting adhesive. Therefore, after the optical fiber ring is manufactured, the stress of the optical fibers at two sides of the optical fiber ring, which are symmetrical about the midpoint, has deviation, and the deviation can also change along with the change of the environmental temperature, so that the zero position of the optical fiber gyroscope drifts, and the precision loss is serious.
SUMMERY OF THE UTILITY MODEL
To overcome, at least to some extent, the problems in the related art, the present application provides a fiber optic gyroscope with stress compensation.
The scheme of the application is as follows:
a fiber optic gyroscope with stress compensation, comprising:
the system comprises a light source, a coupler, a Y waveguide, a fiber ring, a detector, a temperature sensor, a signal processing circuit and piezoelectric ceramics;
the coupler is respectively connected with the light source, the detector and the Y waveguide;
the signal control circuit is respectively connected with the detector, the temperature sensor, the Y waveguide and the piezoelectric ceramic;
the optical fiber ring is wound with a first optical fiber and a second optical fiber;
the Y waveguide is connected with the optical fiber ring through a first optical fiber pigtail and a second optical fiber pigtail;
the first optical fiber pigtail or the second optical fiber pigtail is also wound on the piezoelectric ceramic;
the detector is used for detecting sensitive angular rate information of the fiber-optic gyroscope and sending the sensitive angular rate information to the signal processing circuit;
the temperature sensor is used for detecting the temperature information of the fiber-optic gyroscope and sending the temperature information to the signal processing circuit;
and the signal processing circuit is used for controlling the piezoelectric ceramic to perform stress compensation on the first optical fiber pigtail or the second optical fiber pigtail wound on the piezoelectric ceramic according to the sensitive angular rate information and the temperature information.
Preferably, in an implementable manner herein,
the signal processing circuit controls the current on the piezoelectric ceramic to perform stress compensation on the first optical fiber pigtail or the second optical fiber pigtail wound on the piezoelectric ceramic.
Preferably, in an implementable manner herein,
the first optical fiber and the second optical fiber are wound around the optical fiber loop in opposite directions.
Preferably, in an implementable manner herein,
the signal processing circuit includes: a signal control circuit and a stress control circuit;
the signal control circuit is respectively connected with the detector, the temperature sensor, the Y waveguide and the stress control circuit;
the stress control circuit is connected with the piezoelectric ceramic.
Preferably, in an implementable manner of the present application, the fiber pigtail wound around the piezoelectric ceramic is a fiber pigtail with low stress of the first and second optical fibers.
Preferably, in an implementable manner of the present application, the winding length of the first fiber pigtail or the second fiber pigtail on the piezoelectric ceramic is 50cm to 100 cm.
Preferably, in an implementable manner of the present application, a winding length of the first fiber pigtail or the second fiber pigtail on the piezoelectric ceramic is determined by a stress deviation of the first optical fiber and the second optical fiber.
Preferably, in an implementable manner herein,
the first optical fiber and the second optical fiber are wound on the optical fiber ring in a quadrupole symmetry mode.
Preferably, in an implementable manner herein,
the first optical fiber and the second optical fiber have a winding tension of 5g to 10 g.
Preferably, in an implementable manner herein,
the piezoelectric ceramic is of a circular ring structure.
The technical scheme provided by the application can comprise the following beneficial effects:
the fiber-optic gyroscope with stress compensation in the application is additionally provided with a temperature sensor and piezoelectric ceramics on the basis that the existing fiber-optic gyroscope comprises a light source, a coupler, a Y waveguide, a fiber-optic ring, a detector and a signal processing circuit. The coupler is respectively connected with the light source, the detector and the Y waveguide; the signal control circuit is respectively connected with the detector, the temperature sensor, the Y waveguide and the piezoelectric ceramic. The optical fiber ring is wound with the first optical fiber and the second optical fiber, the Y waveguide is connected with the optical fiber ring through the first optical fiber tail fiber and the second optical fiber tail fiber, and the first optical fiber tail fiber or the second optical fiber tail fiber is also wound on the piezoelectric ceramic. When the device works, the detector detects the sensitive angular rate information of the fiber-optic gyroscope and sends the sensitive angular rate information to the signal processing circuit, the temperature sensor detects the temperature information of the fiber-optic gyroscope and sends the temperature information to the signal processing circuit, the signal processing circuit controls the piezoelectric ceramic to perform pressure compensation on the first fiber-optic pigtail or the second fiber-optic pigtail wound on the piezoelectric ceramic in real time according to the sensitive angular rate information and the temperature information of the fiber-optic gyroscope, stress values on two sides are balanced, and therefore zero drift of the fiber-optic gyroscope caused by stress is compensated.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.
FIG. 1 is a schematic structural diagram of a fiber optic gyroscope with stress compensation according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a fiber-optic gyroscope with stress compensation according to another embodiment of the present application.
Reference numerals: a light source-1; a coupler-2; y waveguide-3; an optical fiber ring-4; a detector-5; a signal processing circuit-6; a signal control circuit-61; stress control circuitry-62; piezoelectric ceramic-7; and a temperature sensor-8.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.
Fig. 1 is a schematic structural diagram of a fiber optic gyroscope with stress compensation according to an embodiment of the present application, and referring to fig. 1, a fiber optic gyroscope with stress compensation includes:
the device comprises a light source 1, a coupler 2, a Y waveguide 3, a fiber ring 4, a detector 5, a temperature sensor 8, a signal processing circuit 6 and piezoelectric ceramics 7;
the coupler 2 is respectively connected with the light source 1, the detector 5 and the Y waveguide 3;
the signal control circuit 61 is respectively connected with the detector 5, the temperature sensor 8, the Y waveguide 3 and the piezoelectric ceramic 7;
the optical fiber ring 4 is wound with a first optical fiber and a second optical fiber;
the Y waveguide 3 is connected with the optical fiber ring 4 through a first optical fiber pigtail and a second optical fiber pigtail;
the first optical fiber pigtail or the second optical fiber pigtail is also wound on the piezoelectric ceramic 8;
the detector 5 is used for detecting the sensitive angular rate information of the fiber-optic gyroscope and sending the sensitive angular rate information to the signal processing circuit 6;
the temperature sensor 8 is used for detecting the temperature information of the fiber-optic gyroscope and sending the temperature information to the signal processing circuit 6;
the signal processing circuit 6 is used for controlling the piezoelectric ceramic 7 to perform stress compensation on the first optical fiber pigtail or the second optical fiber pigtail wound on the piezoelectric ceramic 8 according to the sensitive angular rate information and the temperature information.
In the manufacturing technology of the optical fiber ring 4, optical fibers need to be wound on a framework of the optical fiber ring 4 according to a certain winding method, according to the working principle of the optical fiber ring 4, optical signals generated by a light source 1 are respectively input from two ends of the optical fibers, in order to ensure that the external disturbance on the optical signals is minimized, after the optical signals are synchronously input into the optical fibers, the optical paths of the optical signals are the same, the external disturbance on the optical signals at the same moment is the same, and therefore the error caused by the external factor can be eliminated when two beams of light return to interfere, and the use precision of the optical fiber gyroscope is ensured.
The optical fiber pigtail refers to the remaining portion of the first optical fiber and the second optical fiber after being wound on the optical fiber loop 4.
Preferably, in the present embodiment, the first optical fiber and the second optical fiber are wound on the optical fiber ring 4 in a quadrupole symmetry manner, so that the temperature-induced phase error is eliminated to a great extent.
The optical fiber ring 4 is manufactured by winding in a quadrupole symmetry mode and then is encapsulated and cured. Stress fluctuation which is inevitably introduced by winding equipment is inevitably introduced in the winding process of the optical fiber ring, preferably, 5-10g of tension is generally used for winding, and the tension is finally reflected in different stress distribution effects in the optical fiber; tension fluctuation exists at the positions of turn changing, layer changing and edges of winding, so that the stress is abnormal, and the stress under different winding radiuses is inconsistent along with the increase of the number of winding layers; on the other hand, curing stresses and vacuum processing stresses are introduced during potting. The asymmetric stress distribution inside the optical fiber ring affects the optical fiber ring 4 to generate a phase error, and the optical fiber gyro error effect caused by the stress can be expressed as:
where Ω is the zero drift of the gyroscope, n is the refractive index of the fiber, λ is the wavelength of the light, c0 is the speed of light in vacuum, β 0 is the propagation constant of the light, Δ s (z) represents the amount of stress change at the z-point of the fiber sensing loop, L is the fiber length, and D is the loop diameter.
It can be seen from the formula that if there is a stress symmetry between two points symmetrical about the midpoint, it will cause the final optical fiber loop 4 to generate an error in the detection angular rate signal.
Particularly when environmental factors such as temperature change, the stress inside the fiber ring 4 also changes, thereby affecting the stability of the overall performance of the fiber optic gyroscope.
The optical fiber gyroscope generally comprises a light source 1, a coupler 2, a Y waveguide 3, an optical fiber ring 4, a detector 5 and a processing circuit, when the optical fiber ring 4 is wound, the internal stress distribution is correspondingly fixed, and the optical fiber gyroscope generates zero drift along with the temperature change due to the stress along with the temperature change.
The first optical fiber and the second optical fiber are wound around the optical fiber loop in opposite directions, for example, the first optical fiber is wound around the optical fiber loop 4 clockwise, and the second optical fiber is wound around the optical fiber loop 4 counterclockwise.
In this embodiment, first, a stress analyzer is used to test different optical fiber rings 4 by a simulation calculation method, so as to obtain a stress distribution curve inside the optical fiber ring 4; and placing the optical fiber ring 4 into an incubator, and testing the stress distribution curve in a temperature-varying environment.
Since the first fiber and the second fiber may not be equal in length, the first fiber and the second fiber may generate a certain stress integral difference.
And calculating the stress integral difference value of the two sides of the optical fiber ring 4 and a change curve along with the temperature according to the test result.
And winding the optical fiber pigtail with lower stress on the piezoelectric ceramic 7.
Preferably, the piezoelectric ceramic 7 has a circular ring structure, and is easier to wind.
The winding length of the first optical fiber pigtail or the second optical fiber pigtail on the piezoelectric ceramic 7 is 50cm-100cm, and the winding length is determined by the stress deviation of the first optical fiber and the second optical fiber.
And (4) testing by combining a stress analyzer to obtain the effect of applying stress on the piezoelectric ceramics, and finding out control parameters equal to the stress difference value of the optical fiber ring.
And fitting a stress change curve of the optical fiber ring 4 under a temperature change condition by using a method for controlling the stress of the optical fiber by using the piezoelectric ceramic 7 to obtain control parameters of the piezoelectric ceramic 7 under different temperature conditions.
When the optical fiber gyroscope works, the optical fiber ring 4 generates stress along with temperature to cause zero drift, the detector 5 detects the temperature value of the optical fiber gyroscope and sends the temperature value to the signal processing circuit 6, the signal processing circuit 6 obtains the temperature value of the optical fiber gyroscope, current on the piezoelectric ceramic 7 is controlled in real time according to the output value and the temperature value of the optical fiber gyroscope, regulation and control are carried out according to the corresponding relation of the temperature and the current which are fitted in advance, stress values on two sides are balanced, and therefore the zero drift of the optical fiber gyroscope caused by the stress is compensated.
The gyroscope output value is obtained by the signal processing circuit through calculation according to the sensitive angular rate information of the fiber-optic gyroscope detected by the detector.
The temperature value is derived from the temperature information detected by the temperature sensor.
The fiber optic gyroscope with stress compensation in some embodiments, referring to figure 2,
the signal processing circuit 6 includes: a signal control circuit 61 and a stress control circuit 62;
the signal control circuit 61 is respectively connected with the detector 5, the temperature sensor 8, the Y waveguide 3 and the stress control circuit 62;
the stress control circuit 62 is connected to the piezoelectric ceramics 7.
The signal control circuit 61 is mainly used for receiving the sensitive angular rate information sent by the detector 5 and the temperature information sent by the temperature sensor 8, and calculating a temperature value to be controlled according to the sensitive angular rate information and the temperature information of the fiber-optic gyroscope, and the stress control circuit 62 is mainly used for controlling the piezoelectric ceramic 7 to perform stress compensation on the first fiber pigtail or the second fiber pigtail wound on the piezoelectric ceramic 7.
It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.
It should be noted that, in the description of the present application, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, in the description of the present application, the meaning of "a plurality" means at least two unless otherwise specified.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and the scope of the preferred embodiments of the present application includes other implementations in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present application.
It should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present application may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," 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 application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. 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 application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.
Claims (10)
1. A fiber optic gyroscope with stress compensation, comprising:
the system comprises a light source, a coupler, a Y waveguide, a fiber ring, a detector, a temperature sensor, a signal processing circuit and piezoelectric ceramics;
the coupler is respectively connected with the light source, the detector and the Y waveguide;
the signal processing circuit is respectively connected with the detector, the temperature sensor, the Y waveguide and the piezoelectric ceramic;
the optical fiber ring is wound with a first optical fiber and a second optical fiber;
the Y waveguide is connected with the optical fiber ring through a first optical fiber pigtail and a second optical fiber pigtail;
the first optical fiber pigtail or the second optical fiber pigtail is also wound on the piezoelectric ceramic;
the detector is used for detecting sensitive angular rate information of the fiber-optic gyroscope and sending the sensitive angular rate information to the signal processing circuit;
the temperature sensor is used for detecting the temperature information of the fiber-optic gyroscope and sending the temperature information to the signal processing circuit;
the signal processing circuit is used for controlling the piezoelectric ceramics to perform stress compensation on the first optical fiber pigtail or the second optical fiber pigtail wound on the piezoelectric ceramics according to the gyroscope output value and the temperature value.
2. The fiber optic gyroscope with stress compensation of claim 1,
the signal processing circuit controls the current on the piezoelectric ceramic to perform stress compensation on the first optical fiber pigtail or the second optical fiber pigtail wound on the piezoelectric ceramic.
3. The fiber optic gyroscope with stress compensation of claim 1,
the first optical fiber and the second optical fiber are wound around the optical fiber loop in opposite directions.
4. The fiber optic gyroscope with stress compensation of claim 1,
the signal processing circuit includes: a signal control circuit and a stress control circuit;
the signal control circuit is respectively connected with the detector, the temperature sensor, the Y waveguide and the stress control circuit;
the stress control circuit is connected with the piezoelectric ceramic.
5. The fiber optic gyroscope with stress compensation of claim 1, wherein the fiber pigtail wound around the piezoelectric ceramic is a low-stress fiber pigtail of the first and second optical fibers.
6. The fiber optic gyroscope with stress compensation of claim 5, wherein the winding length of the first fiber pigtail or the second fiber pigtail on the piezoelectric ceramic is 50cm-100 cm.
7. The fiber optic gyroscope with stress compensation of claim 6, wherein a winding length of the first fiber pigtail or the second fiber pigtail on the piezoelectric ceramic is determined by a stress deviation of the first fiber and the second fiber.
8. The fiber optic gyroscope with stress compensation of claim 1,
the first optical fiber and the second optical fiber are wound on the optical fiber ring in a quadrupole symmetry mode.
9. The fiber optic gyroscope with stress compensation of claim 1,
the first optical fiber and the second optical fiber have a winding tension of 5g to 10 g.
10. The fiber optic gyroscope with stress compensation of claim 1,
the piezoelectric ceramic is of a circular ring structure.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113203406A (en) * | 2021-04-29 | 2021-08-03 | 长安大学 | Device and method for inhibiting deformation of optical fiber gyroscope ring assembly in acceleration field |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113203406A (en) * | 2021-04-29 | 2021-08-03 | 长安大学 | Device and method for inhibiting deformation of optical fiber gyroscope ring assembly in acceleration field |
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