CN113075740A - Two-dimensional optical fiber geophone - Google Patents
Two-dimensional optical fiber geophone Download PDFInfo
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- CN113075740A CN113075740A CN202110466134.2A CN202110466134A CN113075740A CN 113075740 A CN113075740 A CN 113075740A CN 202110466134 A CN202110466134 A CN 202110466134A CN 113075740 A CN113075740 A CN 113075740A
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- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
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- G01V8/10—Detecting, e.g. by using light barriers
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Abstract
The invention provides a two-dimensional optical fiber geophone, and belongs to the technical field of optical fiber sensing. The optical fiber, the first X axis of the first coupler, the first X axis of the first optical rotation mirror, the second X axis of the first optical rotation mirror, the third coupler, the first Y axis of the first optical rotation mirror, the second Y axis of the second optical rotation mirror, the mass block, the end cap, the tip machine meter screw, the shell; the invention has the following advantages: aiming at the application scene of perimeter security, the two-dimensional optical fiber geophone has lower production cost relative to a three-dimensional optical fiber geophone, and the two-dimensional optical fiber geophone has larger detection radius relative to a one-dimensional optical fiber geophone, so that the two-dimensional optical fiber geophone has higher cost performance in actual security projects.
Description
Technical Field
The invention provides a two-dimensional optical fiber geophone, and belongs to the technical field of optical fiber sensing.
Background
With the continuous maturity of optical fiber and optical fiber communication technology, the application of optical fiber geophones is rapidly developed. Perimeter security systems based on optical fiber sensing technology are gradually valued by people in the security field. Compared with the traditional sensing means such as infrared correlation, electronic fences and the like, the optical fiber geophone has unique advantages that a near-circular section can be monitored, the near-circular area shown in figure 1 is the geophone monitoring section, and the phase type optical fiber sensing system also has the advantages of high concealment, strong anti-electronic interference capability, high sensitivity and the like. The optical fiber geophone has the sensing axes in two orthogonal horizontal directions, signals excited by walking signals of people are picked up by the optical fiber geophone after being transmitted, signals of X and Y are stronger than those of Z axis, and for the application scene of perimeter security, the two-dimensional optical fiber geophone has lower production cost relative to a three-dimensional optical fiber geophone, and the two-dimensional optical fiber geophone has larger detection radius relative to a one-dimensional optical fiber geophone, so that the optical fiber geophone has higher cost performance in the actual security project. The two-dimensional optical fiber geophone can orient an intrusion target because of having signals in two directions.
Disclosure of Invention
In order to solve the problems, the invention provides a two-dimensional optical fiber geophone which is used for detecting an intrusion target.
The technical scheme adopted by the invention comprises the following steps: the optical fiber coupling device comprises a first coupler, a second coupler, a first X-axis wound optical fiber, a first X-axis elastomer and a first X-axis Faraday optical rotation mirror, a second X-axis wound optical fiber, a second X-axis elastomer, a second X-axis Faraday optical rotation mirror, a third coupler, a first Y-axis wound optical fiber, a first Y-axis elastomer and a first Y-axis Faraday optical rotation mirror, a second Y-axis wound optical fiber, a second Y-axis elastomer, a second Y-axis Faraday optical rotation mirror, a mass block, an end cover, a tip machine meter screw, a shell bottom cover and a ground pile;
the first X-axis elastomer, the second X-axis elastomer, the mass block, the first X-axis end cover and the second X-axis end cover form an X-axis optical fiber sensitization structure.
The second coupler, the first X-axis wound optical fiber and the X-axis Faraday optical rotation mirror form an X-axis Michelson interferometer;
the first X-axis elastic body and the second X-axis elastic body are respectively positioned at two sides of the mass block, one end of the first X-axis winding optical fiber is connected with one output port of the second optical fiber coupler, the middle of the first X-axis winding optical fiber is wound on the first X-axis elastic body, the other end of the first X-axis winding optical fiber is connected with the first X-axis Faraday rotator, one end of the second X-axis sensing optical fiber is connected with one output port of the second optical fiber coupler, the middle of the second X-axis sensing optical fiber is wound on the second X-axis elastic body, and the; the first X-axis end cover and the second X-axis end cover are respectively positioned on one sides of the first X-axis elastic body and the second X-axis elastic body, which are far away from the mass block, and the two tip end machine screws are connected with the first X-axis end cover, the second X-axis end cover and the shell;
the first Y-axis elastomer, the second Y-axis elastomer, the mass block, the first Y-axis end cover and the second Y-axis end cover form a Y-axis optical fiber sensitization structure.
The third coupler, the first Y-axis wound optical fiber and the first Y-axis Faraday optical rotation mirror form a Y-axis Michelson interferometer;
the first Y-axis elastic body and the second Y-axis elastic body are respectively positioned at two sides of the mass block, one end of the first Y-axis winding optical fiber is connected with an output port of the third optical fiber coupler, the middle of the first Y-axis winding optical fiber is wound on the first Y-axis elastic body, the other end of the first Y-axis winding optical fiber is connected with the first Y-axis Faraday rotator, one end of the second Y-axis sensing optical fiber is connected with an output port of the third optical fiber coupler, the middle of the second Y-axis sensing optical fiber is wound on the second Y-axis elastic body, and; the first Y-axis end cover and the second Y-axis end cover are respectively positioned on one sides of the first Y-axis elastic body and the second Y-axis elastic body, which are far away from the mass block, and the two tip end machine screws are connected with the first Y-axis end cover, the second Y-axis end cover and the shell;
the first coupler is used for respectively inputting externally input light into an X-axis Michelson interferometer and a Y-axis Michelson interferometer, the X-axis Michelson interferometer is used for receiving external vibration signal modulation in the X-axis direction and generating an interference optical signal carrying X-axis vibration information, the Y-axis Michelson interferometer is used for receiving external vibration signal modulation in the Y-axis direction and generating an interference optical signal carrying Y-axis vibration information, and the center of the mass block is provided with a small hole for accommodating the first coupler, the second coupler and the third coupler; the first X-axis method is used for pulling the first optical rotation mirror, the second X-axis method is used for pulling the first optical rotation mirror, the first Y-axis method is used for pulling the third optical rotation mirror, and the second Y-axis Faraday optical rotation mirror is respectively stuck to the upper end face and the lower end face of the mass block by glue. The shell and the shell bottom cover are used for sealing the whole device and protecting the internal structure; and the ground pile is connected with the bottom cover of the shell and is used for coupling ground vibration information to the two-dimensional optical fiber geophone.
Compared with the prior art, the invention has the following advantages:
the two-dimensional optical fiber geophone has lower production cost compared with a three-dimensional optical fiber geophone, and the two-dimensional optical fiber geophone has larger detection radius compared with a one-dimensional optical fiber geophone, so that the two-dimensional optical fiber geophone has higher cost performance in practical projects.
Drawings
FIG. 1 is a two-dimensional fiber optic geophone monitoring deployment diagram;
FIG. 2 is a schematic diagram of a fiber optic vibration signal acquisition system;
FIG. 3 is an optical schematic diagram of an optical fiber vibration signal acquisition system;
FIG. 4 is a top view of a two-dimensional fiber optic geophone;
FIG. 5 is a side view of a two-dimensional fiber optic geophone;
FIG. 6 is a diagram of a human target signal received by a three-dimensional fiber optic geophone;
fig. 7 is a diagram of a person target signal received by a two-dimensional fiber optic geophone and a one-dimensional fiber optic geophone.
Detailed Description
The invention will now be further described with reference to the following examples and drawings:
the invention provides a two-dimensional optical fiber geophone, which is a component in an optical fiber vibration signal acquisition system, and the whole optical fiber vibration signal acquisition system is shown in figure 2. The push-pull optical fiber geophone can ensure that the acquired acceleration signals are less interfered by external environments such as temperature and the like, meanwhile, the two-dimensional optical fiber geophone is lower in production cost compared with a three-dimensional optical fiber geophone, the two-dimensional optical fiber geophone has a larger detection radius compared with a one-dimensional optical fiber geophone, and the cost performance is higher in practical projects.
The optical principle diagram of the optical fiber vibration signal acquisition system is shown in fig. 3, the components described in the invention are two-dimensional optical fiber geophones shown by a dashed line in fig. 3, in the optical fiber vibration signal acquisition system shown in fig. 3, a laser is used as a light source, the laser emitted by the laser is input into a coupler 1, split by the coupler 1 and respectively enters the couplers of two michelson interferometers of X and Y, the michelson interferometer of X axis outputs to two sensing optical fibers, and is reflected by a faraday optical rotation mirror at the tail end of a sensing arm and output by another tail optical fiber combined beam of the coupler 2 to form an interference optical signal of X axis, the michelson interferometer of Y axis outputs to two sensing optical fibers, and is reflected by the faraday optical rotation mirror at the tail end of the sensing arm and output by another tail optical fiber combined beam of the coupler 3 to form an interference optical signal of Y axis, X, Y interference optical signal outputs to the two optical detectors of X and Y to be converted into electric signals, the electric signal is output to a demodulator to demodulate the digital vibration signal.
FIG. 4 is a top view of the two-dimensional optical fiber geophone in accordance with the present invention, and FIG. 5 is a side view of the two-dimensional optical fiber geophone in accordance with the present invention; the two-dimensional fiber optic geophone comprises: the optical fiber coupling device comprises a first coupler, a second coupler, a first X-axis wound optical fiber, a first X-axis elastomer and a first X-axis Faraday optical rotation mirror, a second X-axis wound optical fiber, a second X-axis elastomer, a second X-axis Faraday optical rotation mirror, a third coupler, a first Y-axis wound optical fiber, a first Y-axis elastomer and a first Y-axis Faraday optical rotation mirror, a second Y-axis wound optical fiber, a second Y-axis elastomer, a second Y-axis Faraday optical rotation mirror, a mass block, an end cover, a tip machine meter screw, a shell bottom cover and a ground pile; the second coupler, the first X-axis wound optical fiber, the first X-axis elastomer and the first X-axis Faraday rotator form an X-axis Michelson interferometer; the third coupler, the first Y-axis wound optical fiber, the first Y-axis elastomer and the first Y-axis Faraday rotator form a Y-axis Michelson interferometer; the first coupler is used for respectively inputting externally input light into an X-axis Michelson interferometer and a Y-axis Michelson interferometer, the X-axis Michelson interferometer is used for receiving external vibration signal modulation in the X-axis direction to generate an interference signal, and the Y-axis Michelson interferometer is used for receiving external vibration signal modulation in the Y-axis direction to generate an interference signal; the mass block is positioned in the right center of the whole structure and is used for forming two orthogonal spring vibrators on an X axis and a Y axis respectively; the center of the mass block is provided with a small hole for accommodating the first coupler, the second coupler and the third coupler; the first X-axis elastic body, the second X-axis elastic body, the first Y-axis elastic body and the second Y-axis elastic body are tightly attached to four side surfaces of the mass block; the end cap has four: the first X-axis end cover, the second X-axis end cover, the first Y-axis end cover and the second Y-axis end cover are respectively positioned at the other ends, far away from the mass block, of the first X-axis elastic body, the second X-axis elastic body, the first Y-axis elastic body and the second Y-axis elastic body, and the tip machine screw is matched with the end covers and used for fixing the elastic bodies; the shell and the shell bottom cover are used for sealing the whole device and protecting the internal structure; and the ground pile is connected with the bottom cover of the shell and is used for coupling ground vibration information to the two-dimensional optical fiber geophone.
The working principle of the invention is as follows: when an intruder sends a vibration signal at a remote position outside, the vibration signal is coupled and picked up through a ground pile to be acted on the sensing system, the whole two-dimensional optical fiber geophone except the mass block generates acceleration in a horizontal direction, the mass block can compress one elastic body in the X-axis direction and stretch the other elastic body under the action of inertia due to the larger mass of the mass block, and one elastic body can compress the other elastic body and stretch the other elastic body in the Y-axis direction similarly to the X-axis direction. The sensing optical fiber wound on the elastic body is stretched to generate micro deformation to generate optical path difference. The photoelectric detector receives the optical signal and converts the optical signal into an electric signal, and finally the signal demodulator outputs the acquired vibration signal.
The push-pull optical fiber geophone can ensure that the acquired acceleration signals are less interfered by external environments such as temperature and the like, meanwhile, the two-dimensional optical fiber geophone is lower in production cost compared with a three-dimensional optical fiber geophone, the two-dimensional optical fiber geophone has a larger detection radius compared with a one-dimensional optical fiber geophone, and the cost performance is higher in practical projects. The walking result of the tester at a remote place by using the three-dimensional optical fiber geophone is shown in FIG. 6; the walking result of the tester at the same distance by using the two-dimensional optical fiber geophone described in the invention is shown in FIG. 7; the walking result of the tester at the same distance using the one-dimensional optical fiber geophone is shown in fig. 7; the data of the X-axis in the test results of fig. 6 and 7 can see the movement of the person, but the target signals of the three-dimensional optical fiber geophone, the two-dimensional optical fiber geophone, the Y-axis optical fiber geophone, the Z-axis optical fiber geophone and the one-dimensional optical fiber geophone shown in fig. 6 and 7 cannot be detected.
Claims (1)
1. A two-dimensional fiber optic geophone comprising: the optical fiber, the first X axis of the first coupler, the first X axis of the first optical rotation mirror, the second X axis of the first optical rotation mirror, the third coupler, the first Y axis of the first optical rotation mirror, the second Y axis of the second optical rotation mirror, the mass block, the end cap, the tip machine meter screw, the shell;
the first X-axis elastomer, the second X-axis elastomer, the mass block, the first X-axis end cover and the second X-axis end cover form an X-axis optical fiber sensitization structure;
the second coupler, the first X-axis wound optical fiber and the X-axis Faraday optical rotation mirror form an X-axis Michelson interferometer;
the first X-axis elastic body and the second X-axis elastic body are respectively positioned at two sides of the mass block, one end of the first X-axis winding optical fiber is connected with one output port of the second optical fiber coupler, the middle of the first X-axis winding optical fiber is wound on the first X-axis elastic body, the other end of the first X-axis winding optical fiber is connected with the first X-axis Faraday rotator, one end of the second X-axis sensing optical fiber is connected with one output port of the second optical fiber coupler, the middle of the second X-axis sensing optical fiber is wound on the second X-axis elastic body, and the; the first X-axis end cover and the second X-axis end cover are respectively positioned on one sides of the first X-axis elastic body and the second X-axis elastic body, which are far away from the mass block, and the two tip end machine screws are connected with the first X-axis end cover, the second X-axis end cover and the shell;
the first Y-axis elastomer, the second Y-axis elastomer, the mass block, the first Y-axis end cover and the second Y-axis end cover form a Y-axis optical fiber sensitization structure;
the third coupler, the first Y-axis wound optical fiber and the first Y-axis Faraday optical rotation mirror form a Y-axis Michelson interferometer;
the first Y-axis elastic body and the second Y-axis elastic body are respectively positioned at two sides of the mass block, one end of the first Y-axis winding optical fiber is connected with an output port of the third optical fiber coupler, the middle of the first Y-axis winding optical fiber is wound on the first Y-axis elastic body, the other end of the first Y-axis winding optical fiber is connected with the first Y-axis Faraday rotator, one end of the second Y-axis sensing optical fiber is connected with an output port of the third optical fiber coupler, the middle of the second Y-axis sensing optical fiber is wound on the second Y-axis elastic body, and; the first Y-axis end cover and the second Y-axis end cover are respectively positioned on one sides of the first Y-axis elastic body and the second Y-axis elastic body, which are far away from the mass block, and the two tip end machine screws are connected with the first Y-axis end cover, the second Y-axis end cover and the shell;
the first coupler is used for respectively inputting externally input light into an X-axis Michelson interferometer and a Y-axis Michelson interferometer, the X-axis Michelson interferometer is used for receiving external vibration signal modulation in the X-axis direction and generating an interference optical signal carrying X-axis vibration information, the Y-axis Michelson interferometer is used for receiving external vibration signal modulation in the Y-axis direction and generating an interference optical signal carrying Y-axis vibration information, and the center of the mass block is provided with a small hole for accommodating the first coupler, the second coupler and the third coupler; the first X-axis method is used for pulling the first optical rotation mirror, the second X-axis method is used for pulling the first optical rotation mirror, the first Y-axis method is used for pulling the third optical rotation mirror, and the second Y-axis Faraday optical rotation mirror is respectively stuck to the upper end face and the lower end face of the mass block by glue. The shell and the shell bottom cover are used for sealing the whole device and protecting the internal structure; and the ground pile is connected with the bottom cover of the shell and is used for coupling ground vibration information to the two-dimensional optical fiber geophone.
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| CN202110466134.2A CN113075740A (en) | 2021-04-28 | 2021-04-28 | Two-dimensional optical fiber geophone |
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| CN202110466134.2A CN113075740A (en) | 2021-04-28 | 2021-04-28 | Two-dimensional optical fiber geophone |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113720435A (en) * | 2021-09-09 | 2021-11-30 | 长沙深之瞳信息科技有限公司 | Indoor text security fiber sensing system and monitoring method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113720435A (en) * | 2021-09-09 | 2021-11-30 | 长沙深之瞳信息科技有限公司 | Indoor text security fiber sensing system and monitoring method |
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