CN117347701B - Optical fiber current detection device - Google Patents
Optical fiber current detection device Download PDFInfo
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- CN117347701B CN117347701B CN202311649099.3A CN202311649099A CN117347701B CN 117347701 B CN117347701 B CN 117347701B CN 202311649099 A CN202311649099 A CN 202311649099A CN 117347701 B CN117347701 B CN 117347701B
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 93
- 238000001514 detection method Methods 0.000 title claims abstract description 21
- 230000005540 biological transmission Effects 0.000 claims abstract description 22
- 230000007246 mechanism Effects 0.000 claims abstract description 16
- 230000009471 action Effects 0.000 claims abstract description 6
- 239000000835 fiber Substances 0.000 claims description 15
- 230000003287 optical effect Effects 0.000 claims description 11
- 238000005452 bending Methods 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 21
- 239000004020 conductor Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 230000000149 penetrating effect Effects 0.000 description 4
- 230000010287 polarization Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/24—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices
- G01R15/245—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices using magneto-optical modulators, e.g. based on the Faraday or Cotton-Mouton effect
- G01R15/246—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices using magneto-optical modulators, e.g. based on the Faraday or Cotton-Mouton effect based on the Faraday, i.e. linear magneto-optic, effect
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Abstract
The invention discloses an optical fiber current detection device, and belongs to the field of current detection. Comprising the following steps: the base is pivotally connected with the first semi-annular body and the second semi-annular body on the base, and the operating mechanism; optical fibers are arranged in the first semi-annular body and the second semi-annular body, and the first semi-annular body and the second semi-annular body can be switched between an open position and a working position under the action of an operating mechanism; the optical fiber comprises a transmission optical fiber and a sensing optical fiber, wherein the transmission optical fiber is connected with the sensing optical fiber through a 1/4 wave plate, the tail end of the sensing optical fiber is provided with a reflecting mirror, the transmission optical fiber extends to the free end of the first semi-annular body along the pivoting side of the first semi-annular body, is connected with the 1/4 wave plate after being bent in an arc shape, the other end of the 1/4 wave plate is connected with the sensing optical fiber, and the sensing optical fiber extends to the pivoting side along the first semi-annular body and extends to the free end of the second semi-annular body through the pivoting side of the second semi-annular body; when in working position, the 1/4 wave plate is opposite to the reflecting mirror. The invention realizes the portable rapid measurement of large current.
Description
Technical Field
The invention relates to the field of direct current detection, in particular to an optical fiber current detection device.
Background
The current measurement is widely applied to various fields of the prior society, is an important control means and parameter in the industrial production process, and various devices capable of measuring the current at present comprise the following components: current measurement is done based on the principle of electromagnetic induction, and such sensors can only test alternating current, because an alternating magnetic field is required. 2. Hall current sensor: the measurement of current is completed based on the Hall principle, and alternating current and direct current can be measured. In order to ensure measurement accuracy, a magnetic ring is usually required to perform magnetism gathering, and quick measurement is difficult to achieve, so that the method is widely applied to the measurement of current fixed on a conductor. 3. A shunt: the shunt can finish the current measurement only by connecting the shunt resistor in the loop in series, and the possibility of realizing quick measurement is not provided; 4. rogowski coil current transformer: based on Faraday's law, the current measurement is realized, and the current measurement is mostly used for measuring alternating current and pulse direct current, and the measurement of pure direct current cannot be realized.
Disclosure of Invention
Therefore, the invention provides an optical fiber current detection device which can realize portable rapid measurement of alternating current, direct current and large current with various complex waveforms.
Aiming at the technical problems, the invention provides the following technical scheme:
a fiber optic current sensing device comprising: the base is pivotally connected with the first semi-annular body and the second semi-annular body on the base, and the operating mechanism; the optical fibers are arranged in the first semi-annular body and the second semi-annular body, and the first semi-annular body and the second semi-annular body can be switched between an open position and a working position under the action of the operating mechanism; the free ends of the first semi-annular body and the second semi-annular body are arranged at intervals in the opening position, and the free ends of the first semi-annular body and the second semi-annular body are provided with partial overlapping areas in the working position; the optical fiber comprises a transmission optical fiber and a sensing optical fiber, wherein the transmission optical fiber is connected with the sensing optical fiber through a 1/4 wave plate, the tail end of the sensing optical fiber is provided with a reflecting mirror, the transmission optical fiber extends to the free end of the first semi-annular body along the pivoting side of the first semi-annular body, is bent in an arc shape and then is connected with the 1/4 wave plate, the other end of the 1/4 wave plate is connected with the sensing optical fiber, and the sensing optical fiber extends to the pivoting side along the first semi-annular body and extends to the free end of the second semi-annular body through the pivoting side of the second semi-annular body; and when the reflecting mirror is in the working position, the 1/4 wave plate is arranged opposite to the reflecting mirror.
In some embodiments of the present invention, the first semi-annular body includes a first arc-shaped region with a consistent radial width and a second arc-shaped region with a gradually increasing radial width, the radius of the second arc-shaped region is the same as that of the outer arc surface of the first arc-shaped region, the transmission optical fiber is close to the inner arc surface sides of the first arc-shaped region and the second arc-shaped region, the 1/4 wave plate is arranged on the second arc-shaped region and is close to the outer arc surface side thereof, and the sensing optical fiber is close to the outer arc surface sides of the first arc-shaped region and the second arc-shaped region.
In some embodiments of the present invention, the first semi-ring body is provided with a first guiding groove in the same direction as the extending direction of the first semi-ring body, the second semi-ring body is provided with a second guiding groove in the same direction as the extending direction of the second semi-ring body, and the optical fiber is fixedly connected in the first guiding groove and the second guiding groove.
In some embodiments of the present invention, the first semi-annular body is pivotally connected to the base through a first swing seat, the second semi-annular body is pivotally connected to the base through a second swing seat, a third guide groove communicated with the first guide groove is provided on the first swing seat, and a fourth guide groove communicated with the second guide groove is provided on the second swing seat.
In some embodiments of the present invention, the third guide groove has a larger notch on a side away from the first guide groove than a notch on a side close to the first guide groove, and the fourth guide groove has a larger notch on a side away from the second guide groove than a notch on a side close to the second guide groove.
In some embodiments of the present invention, the outer cambered surface of the first semi-annular body, which is close to the free end of the first semi-annular body, is provided with a limiting projection, and the opposite surfaces of the limiting projection and the free end of the second semi-annular body are respectively provided with a limiting groove and a limiting protrusion; and when the device is in the working position, the limiting protrusion is inserted into the limiting groove.
In some embodiments of the present invention, the base is provided with a guiding elastic piece, and the guiding elastic piece is abutted against the optical fiber located between the first swing seat and the second swing seat, and is suitable for making the bending angle of the optical fiber be greater than a first threshold value when the optical fiber is in the open position.
In some embodiments of the present invention, the first swing seat and the second swing seat are respectively provided with a pivot portion and a driving portion, the first semi-annular body and the second semi-annular body are respectively capable of swinging around the respective pivot portions, the operating mechanism includes an operating lever capable of sliding along a first direction, two driving levers pivotally connected to a first side end portion of the operating lever, and the other ends of the driving levers are respectively pivotally connected to the driving portions of the first semi-annular body and the second semi-annular body.
In some embodiments of the present invention, the operating mechanism further includes a pull rod and a handle located at an end of the pull rod, and a reset elastic member is disposed between the pull rod and the operating rod; the pull rod is pulled by the handle to move along the first direction so as to drive the operation rod to move.
In some embodiments of the present invention, the device further comprises a support sleeve connected to the base and extending in the first direction, wherein a portion of the lever, the return spring, and a portion of the pull rod are located within the support sleeve.
In some embodiments of the present invention, the optical fiber transmission device further includes a control host connected to the support sleeve, the control host includes an optical signal generating portion, a circulator, a polarizer, and an optical receiving component, and the transmission optical fiber extends to the optical signal generating portion along the support sleeve; the light emitted by the light signal generating part is converted into linearly polarized light through the circulator and the polarizer and then transmitted along the transmission optical fiber, and the light receiving component is used for converting the light carrying the phase difference signal into an electric signal.
Compared with the prior art, the technical scheme of the invention has the following technical effects:
in the optical fiber current detection device provided by the invention, the optical fiber for realizing current detection is arranged on the first semi-annular body and the second semi-annular body, and the first semi-annular body and the second semi-annular body can be switched between the opening position and the working position under the action of the operating mechanism. When the device is used, the detection device is firstly switched to an open position and sleeved on a tested conductor, and then switched to a working position, so that the sensing optical fiber is closed, and the rapid measurement of current is completed; for industrial equipment with a plurality of measuring points and scenes needing frequent measurement, the testing efficiency is greatly improved.
Drawings
The objects and advantages of the present invention will be better understood by describing in detail preferred embodiments thereof with reference to the accompanying drawings in which:
FIG. 1 is a schematic diagram of an embodiment of a fiber optic current sensing device according to the present invention;
FIG. 2 is a schematic diagram of an embodiment of a fiber optic current sensing device according to the present invention;
FIG. 3 is a system block diagram of a fiber optic current sensing device of the present invention;
FIG. 4 is a schematic view of a portion of a fiber optic current detection device according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a first semi-annular body of the optical fiber current detecting device according to the present invention;
FIG. 6 is a schematic diagram of a second semi-annular body of the optical fiber current detecting device according to the present invention;
fig. 7 is a schematic view of a part of a structure of an optical fiber current detecting device according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
Fig. 1 and fig. 2 show a specific embodiment of an optical fiber current detection device provided by the invention, which realizes current measurement based on faraday magneto-optical effect and ampere loop. The current detection device comprises a base 10, a first semi-ring 21 and a second semi-ring 22 which are pivotally connected to the base 10, and an operating mechanism 30; the first semi-annular body 21 and the second semi-annular body 22 are internally provided with optical fibers 40, and the two can be switched between an open position and a working position under the action of the operating mechanism 30; in the open position, the free ends of the first semi-annular body 21 and the second semi-annular body 22 are spaced apart, and in the working position, the free ends of the first semi-annular body 21 and the second semi-annular body 22 have a partial overlapping area along the circumferential direction; the optical fiber comprises a transmission optical fiber 41 and a sensing optical fiber 42, wherein the transmission optical fiber 41 is connected with the sensing optical fiber 42 through a 1/4 wave plate 43, the tail end of the sensing optical fiber 42 is provided with a reflecting mirror 44, the transmission optical fiber 41 extends to the free end of the first semi-annular body 21 along the pivoting side, is bent in an arc shape and then is connected with the 1/4 wave plate 43, the other end of the 1/4 wave plate 43 is connected with the sensing optical fiber 42, and the sensing optical fiber 42 extends to the pivoting side along the first semi-annular body 21 and extends to the free end of the second semi-annular body 22 through the pivoting side of the second semi-annular body 22; in the working position, the 1/4 wave plate 43 is disposed opposite to the reflecting mirror 44, where the opposite arrangement means that, in the working position, there is a superposition area between the 1/4 wave plate 43 and the reflecting mirror 44 in the circumferential position of the annular ring surrounded by the sensing fiber 42.
In the above-described current detection device, by attaching optical fibers for current detection to the first half-ring 21 and the second half-ring 22, the first half-ring 21 and the second half-ring 22 can be switched between the open position and the operating position by the operation mechanism 30. When in use, the detection device is firstly switched to an open position and sleeved on a tested conductor, and then switched to a working position, so that the sensing optical fiber 42 is closed, and the rapid measurement of current is completed; for industrial equipment with a plurality of measuring points and scenes needing frequent measurement, the testing efficiency is greatly improved. The 1/4 wave plate 43 is disposed opposite to the reflecting mirror 44, so that the sensing optical fiber 42 can form a loop, and the stray magnetic field is integrated to be 0 on the loop of the sensing optical fiber according to ampere loop law, so that the detection device is insensitive to the stray magnetic field, and high-precision measurement can be realized.
Specifically, when the current detecting device is in the working position, the free ends of the first semi-ring 21 and the second semi-ring 22 are abutted against each other, so as to form a closed loop, thereby further improving the measurement accuracy.
Specifically, as shown in fig. 1, the current detection device includes a control host 50, as shown in fig. 3, the control host 50 includes an optical signal generating part 51 for emitting an optical signal, and the optical signal generating part 51 is a super-radiation light emitting diode (SLD) light source. The optical signal generating unit 51 is connected to the transmission optical fiber 41. The control host 50 further includes a circulator 52, a polarizer 53, a phase modulator 54, and a light receiving element 55. Light emitted from a superluminescent diode (SLD) light source passes through the circulator 52 and the polarizer 53, and becomes linearly polarized light. 45-degree fusion is carried out between the polarizer 53 and the phase modulator 54, linear polarized light is injected into an input end tail fiber of the phase modulator 54 at 45 degrees, then is transmitted along an X axis and a Y axis of a polarization maintaining fiber respectively, after being modulated in the phase modulator 54, two orthogonal mode linear polarized lights enter a polarization maintaining fiber delay line, and are respectively changed into left-handed circularly polarized light and right-handed circularly polarized light after passing through a 1/4 wave plate 43, and then enter a sensing fiber 42 for propagation; the current transmitted in the conductor to be measured generates a magnetic field, a faraday magneto-optical effect is generated in the sensing optical fiber 42, the phase difference of the two circularly polarized lights is changed and transmitted at different phase speeds, after the two circularly polarized lights are reflected by the reflecting mirror 44, the polarization modes of the two circularly polarized lights are interchanged (namely, the left rotation is changed into the right rotation, the right rotation is changed into the left rotation), the two circularly polarized lights pass through the sensing optical fiber 42 again, and the phase difference generated by the two circularly polarized lights is doubled again through the faraday effect. After passing through the 1/4 wave plate 43 again, the two beams are restored to linearly polarized light. The two beams interfere at the polarizer 53, and the light carrying the phase difference signal enters the light receiving element 55 to be converted into an electric signal. According to Faraday magneto-optical effect and ampere loop law, the magnitude of current transmitted in a conductor to be measured is in direct proportion to the phase difference, so that the value of the current to be measured can be calculated by detecting an optical phase difference signal.
Specifically, as shown in fig. 5, the first semi-annular body 21 includes a first arc-shaped region 21a with a uniform radial width and a second arc-shaped region 21b with a gradually increasing radial width, the first arc-shaped region 21a is close to the pivoting end of the first semi-annular body 21, and the second arc-shaped region 21b is close to the free end of the first semi-annular body 21; wherein the radius of the second arc-shaped area 21b is the same as the radius of the outer arc-shaped area 21a, that is, the radius of the inner arc-shaped area 21b is smaller than the radius of the inner arc-shaped area 21 a. The transmission optical fiber 41 is close to the inner arc surface sides of the first arc-shaped area 21a and the second arc-shaped area 21b, the transmission optical fiber 41 extends from the first arc-shaped area 21a to the second arc-shaped area 21b and is bent to one side of the second arc-shaped area 21b close to the outer arc surface through an arc, the 1/4 wave plate 43 is arranged on one side of the second arc-shaped area 21b close to the outer arc surface, and the sensing optical fiber 42 is close to the outer arc surface sides of the first arc-shaped area 21a and the second arc-shaped area 21b and extends out through the pivoting side of the first semi-annular body 21 until reaching the inside of the second semi-annular body 22.
Specifically, in an alternative embodiment, as shown in fig. 5 and 6, the first semi-annular body 21 is provided with a first guiding groove 211 in the same direction as the first semi-annular body, the second semi-annular body 22 is provided with a second guiding groove 221 in the same direction as the second semi-annular body, and the optical fibers are fixedly connected in the first guiding groove 211 and the second guiding groove 221 so as to avoid the problem that the measurement accuracy is reduced due to the displacement of the optical fibers when the first semi-annular body 21 and the second semi-annular body 22 are opened or the working position is switched; in one embodiment, the optical fiber is adhered to the inside of the first guide groove 211 and the second guide groove 221 by an adhesive. In another embodiment, the optical fiber is fixed to the fixing hooks in the first guide groove 211 and the second guide groove 221 by a binding band.
More specifically, as shown in fig. 7, the first semi-ring 21 further includes a first cover plate 212 covering the first guide groove 211, and the second semi-ring 22 includes a second cover plate 222 covering the second guide groove 221. The first cover plate 212 is connected with the first semi-annular body 21 through a fastening component penetrating between the first cover plate and the first semi-annular body, and the second cover plate 222 is connected with the second semi-annular body 22 through a fastening component penetrating between the second cover plate and the second semi-annular body.
Specifically, the base 10 has an installation cavity, which is formed by detachably connecting a first half base body and a second half base body; in an alternative embodiment, as shown in fig. 2, the first semi-ring 21 is pivotally connected to the base 10 through a first swinging seat 23, the second semi-ring 22 is pivotally connected to the base 10 through a second swinging seat 24, a third guiding groove 231 communicating with the first guiding groove 211 is provided on the first swinging seat 23, and a fourth guiding groove 241 communicating with the second guiding groove 221 is provided on the second swinging seat 24; wherein, the notch of the third guide groove 231 far from the first guide groove 211 is larger than the notch of the fourth guide groove 241 near to the first guide groove 211, and the notch of the fourth guide groove 241 far from the second guide groove 221 is larger than the notch of the second guide groove 221. When the first half-ring 21 and the second half-ring 22 are in the open state, the structures of the third guide groove 231 and the fourth guide groove 241 of the first swing seat 23 and the second swing seat 24 can prevent the sharp surface from acting on the optical fiber between the first half-ring 21 and the second half-ring 22 during the pivoting process.
More specifically, in an alternative embodiment, the first semi-ring 21 is integrally formed with the first swing seat 23, the second semi-ring 22 is integrally formed with the second swing seat 24, the first guide groove 211 and the third guide groove 231 are smoothly transited, and the second guide groove 221 and the fourth guide groove 241 are smoothly transited.
Specifically, in an alternative embodiment, as shown in fig. 2, the base 10 is provided with a guiding elastic piece 11, and the guiding elastic piece 11 abuts against the optical fiber located between the first swinging seat 23 and the second swinging seat 24, so that the bending angle of the optical fiber is larger than the first threshold value when the optical fiber is in the open position. More specifically, the elastic force of the guide elastic piece 11 is adapted to cause the optical fiber to have a tendency to move radially outward.
Specifically, in an alternative embodiment, as shown in fig. 4 and 7, an outer arc surface of the first semi-annular body 21 near the free end thereof is provided with a limit bump 213, and opposite surfaces of the limit bump 213 and the free end of the second semi-annular body 22 are respectively provided with a limit groove 214 and a limit protrusion 223; in the working position, the limiting protrusion 223 is inserted into the limiting groove 214. The above-described guide structure ensures that the 1/4 wave plate 43 is positioned opposite the mirror 44 when the detection device is in the operating position.
Specifically, as shown in fig. 4, the first swinging seat 23 and the second swinging seat 24 are respectively provided with a pivot portion 25 and a driving portion 26, the first semi-annular body 21 and the second semi-annular body 22 are respectively swingable around the respective pivot portions 25, the operating mechanism 30 includes an operating lever 31 slidable along a first direction (arrow a direction in the drawing), two driving levers 32 pivotally connected to a first side end portion of the operating lever 31, and the other ends of the driving levers 32 are respectively pivotally connected to the driving portions 26 of the first semi-annular body 21 and the second semi-annular body 22. More specifically, the pivot portion 25 includes a pivot hole formed in the first swing seat 23 and the second swing seat 24, and a pivot shaft penetrating the pivot hole, the pivot shaft is rotatably connected to the base 10, the driving portion 26 includes a driving hole formed in the first swing seat 23 and the second swing seat 24, and a driving shaft penetrating the driving hole, and an end portion of the driving rod 32 is sleeved on the driving shaft.
As shown in fig. 2, the operating mechanism 30 further includes a pull rod 33 and a handle 34 located at an end of the pull rod 33, and a reset elastic member 35 is disposed between the pull rod 33 and the operating rod 31; when the pull handle 34 is pulled to make the pull rod 33 move linearly in a direction away from the operating rod 31 (i.e., in a first direction), the pull rod 33 drives the operating rod 31 to move through the reset elastic piece 35, and the driving rod 32 connected to the operating rod 31 makes the first swinging seat 23 and the second swinging seat 24 pivot around respective pivot shafts, so that the first semi-ring body 21 and the second semi-ring body 22 are in an open state; after the pull handle 34 is released, under the action of the reset elastic member 35, the operating rod 31 returns to its initial position, so that the first semi-annular body 21 and the second semi-annular body 22 are in a working state in which the free ends are overlapped.
As shown in fig. 2, the detecting device further includes a support sleeve 60 connected to the base 10 and extending in the first direction, and a portion of the operating rod 31, the return elastic member 35, and a portion of the pull rod 33 are located in the support sleeve 60; the support sleeve 60 is provided with a handle support seat 70 on a side far away from the base 10, the handle support seat 70 is provided with a sliding rail 71, and the handle 34 is slidably connected to the sliding rail 71, so as to limit the sliding direction of the handle 34 and the pull rod 33, and avoid shaking.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While obvious variations or modifications are contemplated as falling within the scope of the present invention.
Claims (10)
1. An optical fiber current detection device, comprising:
the base is pivotally connected with the first semi-annular body and the second semi-annular body on the base, and the operating mechanism; the first semi-annular body is pivotally connected to the base through a first swinging seat, the second semi-annular body is pivotally connected to the base through a second swinging seat, the first swinging seat and the second swinging seat are respectively provided with a pivoting part and a driving part, the first semi-annular body and the second semi-annular body can swing around the respective pivoting parts, the operating mechanism comprises an operating rod capable of sliding along a first direction, two driving rods are pivotally connected to the first side end parts of the operating rod, and the other ends of the driving rods are respectively pivotally connected to the driving parts of the first semi-annular body and the second semi-annular body; the optical fibers are arranged in the first semi-annular body and the second semi-annular body, and the first semi-annular body and the second semi-annular body can be switched between an open position and a working position under the action of the operating mechanism; the free ends of the first semi-annular body and the second semi-annular body are arranged at intervals in the opening position, and the free ends of the first semi-annular body and the second semi-annular body are provided with partial overlapping areas in the working position;
the optical fiber comprises a transmission optical fiber and a sensing optical fiber, wherein the transmission optical fiber is connected with the sensing optical fiber through a 1/4 wave plate, the tail end of the sensing optical fiber is provided with a reflecting mirror, the transmission optical fiber extends to the free end of the first semi-annular body along the pivoting side of the first semi-annular body, is bent in an arc shape and then is connected with the 1/4 wave plate, the other end of the 1/4 wave plate is connected with the sensing optical fiber, and the sensing optical fiber extends to the pivoting side along the first semi-annular body and extends to the free end of the second semi-annular body through the pivoting side of the second semi-annular body; and when the reflecting mirror is in the working position, the 1/4 wave plate is arranged opposite to the reflecting mirror.
2. The optical fiber current detecting device according to claim 1, wherein the first semi-annular body comprises a first arc-shaped area with consistent radial width and a second arc-shaped area with gradually increased radial width, the radius of the second arc-shaped area is the same as that of the outer arc surface of the first arc-shaped area, the transmission optical fiber is close to the inner arc surface sides of the first arc-shaped area and the second arc-shaped area, the 1/4 wave plate is arranged on the second arc-shaped area and close to the outer arc surface side of the second arc-shaped area, and the sensing optical fiber is close to the outer arc surface sides of the first arc-shaped area and the second arc-shaped area.
3. The optical fiber current detecting device according to claim 1, wherein the first semi-annular body is provided with a first guiding groove consistent with the extending direction thereof, the second semi-annular body is provided with a second guiding groove consistent with the extending direction thereof, and the optical fiber is fixedly connected in the first guiding groove and the second guiding groove.
4. A fiber optic current sensing device according to claim 3, wherein the first swing seat is provided with a third guide slot in communication with the first guide slot, and the second swing seat is provided with a fourth guide slot in communication with the second guide slot.
5. The fiber optic current sensing device of claim 4 wherein the third guide slot has a greater notch on a side away from the first guide slot than on a side closer to the first guide slot and the fourth guide slot has a greater notch on a side away from the second guide slot than on a side closer to the second guide slot.
6. The optical fiber current detection device according to claim 1, wherein the outer cambered surface of the first semi-annular body, which is close to the free end of the first semi-annular body, is provided with a limit lug, and the opposite surfaces of the limit lug and the free end of the second semi-annular body are respectively provided with a limit groove and a limit bulge; and when the device is in the working position, the limiting protrusion is inserted into the limiting groove.
7. The optical fiber current detecting device according to claim 4, wherein the base is provided with a guiding elastic piece, the guiding elastic piece is abutted against the optical fiber between the first swing seat and the second swing seat, and the guiding elastic piece is suitable for enabling the bending angle of the optical fiber to be larger than a first threshold value when the optical fiber is in an open position.
8. The optical fiber current detecting device according to claim 7, wherein the operating mechanism further comprises a pull rod and a pull handle at an end of the pull rod, and a reset elastic member is arranged between the pull rod and the operating rod; the pull rod is pulled by the handle to move along the first direction so as to drive the operation rod to move.
9. The fiber optic current sensing device of claim 8, further comprising a support sleeve coupled to the base and extending in a first direction, a portion of the lever, the return spring and a portion of the pull rod being positioned within the support sleeve.
10. The fiber optic current sensing device of claim 9, further comprising a control host coupled to the support sleeve, the control host including an optical signal generating portion, a circulator, a polarizer, and an optical receiving assembly, the transmission fiber extending along the support sleeve to the optical signal generating portion; the light emitted by the light signal generating part is converted into linearly polarized light through the circulator and the polarizer and then transmitted along the transmission optical fiber, and the light receiving component is used for converting the light carrying the phase difference signal into an electric signal.
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