CN213714536U - Optical fiber vibration detection device combining M-Z interferometer and phi-OTDR - Google Patents
Optical fiber vibration detection device combining M-Z interferometer and phi-OTDR Download PDFInfo
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- CN213714536U CN213714536U CN202023223919.7U CN202023223919U CN213714536U CN 213714536 U CN213714536 U CN 213714536U CN 202023223919 U CN202023223919 U CN 202023223919U CN 213714536 U CN213714536 U CN 213714536U
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Abstract
The utility model discloses an optic fibre vibration detection device that M-Z interferometer and phi-OTDR combine, including the industrial computer, the output electricity of industrial computer is connected with data acquisition card, data acquisition card's output electricity is connected with optical coupler two. The utility model discloses a set up the industrial computer, data acquisition card, optical coupler two, optical coupler one, the laser instrument, pulse modulator, optical amplifier, optical circulator one, fibre core one, optical circulator two, photoelectric detector three, optical circulator three, optical coupler three, fibre core two, fibre core three, optical coupler four, mutual cooperation of photoelectric detector one and synchronizing signal generator, the advantage that the detection precision is high has been reached, current optic fibre vibration detection device has been solved, it is low to detect the precision, when people are using optic fibre vibration detection device, can't use according to actual conditions, can't satisfy the field usage demand, influence its detection precision, the problem that inconvenient people used.
Description
Technical Field
The utility model relates to an optic fibre vibration detection device technical field specifically is an optic fibre vibration detection device that M-Z interferometer and phi-OTDR combine.
Background
The optical fiber vibration detection device mainly comprises an interference type distributed sensing device and a scattering type coherent optical time domain sensing device, wherein the two devices have respective defects, the sensitivity of interference type equipment is too high, the field practical application is not facilitated in the application, the positioning precision is reduced, the scattering type equipment is difficult to apply in some occasions with high precision requirements, the high-frequency phase change is difficult to measure due to the self principle limitation of the scattering type equipment, and the sensitivity is lower.
Present current optic fibre vibration detection device detects the precision and hangs down, when people are using optic fibre vibration detection device, can't use according to actual conditions, can't satisfy the field usage demand, influences its detection precision, and inconvenient people use.
SUMMERY OF THE UTILITY MODEL
Technical problem to be solved
The utility model provides a not enough to prior art, the utility model provides a optic fibre vibration detection device that M-Z interferometer and phi-OTDR combine possesses the advantage that the detection precision is high, has solved current optic fibre vibration detection device, and the detection precision is low, and when people use optic fibre vibration detection device, can't use according to actual conditions, can't satisfy the field usage demand, influences its detection precision, the problem that inconvenient people used.
(II) technical scheme
In order to achieve the above object, the utility model provides a following technical scheme: an optical fiber vibration detection device combining an M-Z interferometer and a phi-OTDR comprises an industrial personal computer, wherein the output end of the industrial personal computer is electrically connected with a data acquisition card, the output end of the data acquisition card is electrically connected with a second optical coupler, the output end of the second optical coupler is electrically connected with a first optical coupler, the output end of the first optical coupler is respectively and electrically connected with a laser and a pulse modulator, the output end of the pulse modulator is electrically connected with an optical amplifier, the output end of the optical amplifier is electrically connected with a first optical circulator, the output end of the first optical circulator is electrically connected with a first fiber core, the output end of the data acquisition card is respectively and electrically connected with a second optical circulator, a second photoelectric detector, a third photoelectric detector and a third optical circulator, the output end of the second optical circulator is electrically connected with a third optical coupler, and the output end of the third optical circulator is respectively and electrically connected with a second fiber core and a, and the output end of the third optical circulator is electrically connected with a fourth optical coupler.
Preferably, the output end of the second fiber core is electrically connected with the input end of the third fiber core, and the output ends of the second fiber core and the third fiber core are electrically connected with the input end of the fourth optical coupler.
Preferably, the output end of the first optical circulator is electrically connected with a first photoelectric detector, and the output end of the first photoelectric detector is electrically connected with the input end of the data acquisition card.
Preferably, the input end of the second optical circulator is electrically connected with the output end of the second optical coupler.
Preferably, the output end of the pulse modulator is electrically connected with a synchronous signal generator, and the output end of the synchronous signal generator is electrically connected with the input end of the data acquisition card.
(III) advantageous effects
Compared with the prior art, the utility model provides an optic fibre vibration detection device that M-Z interferometer and phi-OTDR combine possesses following beneficial effect:
1. the utility model discloses a set up the industrial computer, data acquisition card, optical coupler two, optical coupler one, the laser instrument, pulse modulator, optical amplifier, optical circulator one, fibre core one, optical circulator two, photoelectric detector three, optical circulator three, optical coupler three, fibre core two, fibre core three, optical coupler four, mutual cooperation of photoelectric detector one and synchronizing signal generator, the advantage that the detection precision is high has been reached, current optic fibre vibration detection device has been solved, it is low to detect the precision, when people are using optic fibre vibration detection device, can't use according to actual conditions, can't satisfy the field usage demand, influence its detection precision, the problem that inconvenient people used.
2. The utility model discloses a set up coherent light source laser and send out the narrowband laser through optical coupler, 3dB coupler according to the optical power ratio divide into two bundles of light, 80% proportion coherent light source enters into acousto-optic modulator, convert pulse light source, after optical amplifier, enter into optical circulator one, enter into optical fiber core one in the optical cable from the export of optical circulator one, the echo enters into photoelectric detector one, photoelectric detector one converts the light signal into the electrical signal and enters into data acquisition card, form complete one way phi-OTDR, 20% power proportion light enters into 1:1 optical power ratio optical coupler two, a beam enters into optical fiber circulator two along the clockwise, after coming out from optical circulator two, enter into 3dB optical coupler three, divide into two bundles of light, pass the sensing area after entering into sensing fiber core one respectively and second, and the four beams of the optical coupler at the tail end are combined and generate interference, the interference light enters the guide optical fiber and finally is collected by the third photoelectric detector after passing through the third optical circulator, the other beam of light which is separated from the second optical coupler enters the third optical fiber circulator along the anticlockwise direction, the third optical fiber enters the fourth optical coupler through the guide optical core firstly, interference is generated at the third optical coupler and is collected by the second photoelectric detector after passing through the second optical circulator, when external disturbance is applied to a certain point of a sensing area, clockwise anticlockwise transmission light generates phase shift quantity with the same characteristic and is respectively collected at the third optical coupler, the second optical coupler generates interference and is collected by the PIN photoelectric detector and is analyzed and processed by the same upper computer at the front section of the system, phi-OTDR is used as main sensing equipment, vibration is positioned according to the test result of the phi-OTDR, and interference type measurement is assisted at the same time, the vibration frequency analysis is carried out on the position, the advantages of the two devices are integrated, a good test result can be finally obtained, and the device can obtain better positioning precision and a wider frequency response range under the condition of ensuring moderate sensitivity.
Drawings
Fig. 1 is a schematic diagram of the system of the present invention.
Detailed Description
In order to make the technical solution of the present invention better understood, the present invention is described in detail below with reference to the accompanying drawings, and the description of the present invention is only exemplary and explanatory, and should not be construed as limiting the scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
It should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like refer to the orientation or positional relationship shown in the drawings, or the orientation or positional relationship that the utility model is usually placed when in use, and are used for convenience of description and simplification of description, but do not refer to or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1, an optical fiber vibration detection device combining an M-Z interferometer and a phi-OTDR includes an industrial personal computer, an output end of the industrial personal computer is electrically connected to a data acquisition card, an output end of the data acquisition card is electrically connected to a second optical coupler, an output end of the second optical coupler is electrically connected to a first optical coupler, an output end of the first optical coupler is electrically connected to a laser and a pulse modulator respectively, an output end of the pulse modulator is electrically connected to an optical amplifier, an output end of the optical amplifier is electrically connected to a first optical circulator, an output end of the first optical circulator is electrically connected to a first fiber core, an output end of the data acquisition card is electrically connected to a second optical circulator, a second optical detector, a third optical detector and a third optical circulator respectively, an output end of the second optical circulator is electrically connected to a third optical coupler, an output end of the third optical coupler is electrically connected to a, the output end of the optical circulator III is electrically connected with an optical coupler IV;
the output end of the second fiber core is electrically connected with the input end of the third fiber core, and the output ends of the second fiber core and the third fiber core are electrically connected with the input end of the fourth optical coupler;
the output end of the first optical circulator is electrically connected with a first photoelectric detector, and the output end of the first photoelectric detector is electrically connected with the input end of a data acquisition card;
the input end of the second optical circulator is electrically connected with the output end of the second optical coupler;
the output end of the pulse modulator is electrically connected with the synchronous signal generator, the output end of the synchronous signal generator is electrically connected with the input end of the data acquisition card, and the industrial personal computer, the data acquisition card, the second optical coupler, the first optical coupler, the laser, the pulse modulator, the optical amplifier, the first optical circulator, the first fiber core, the second optical circulator, the second photoelectric detector, the third optical circulator, the third optical coupler, the second fiber core, the third fiber core, the fourth optical coupler, the first photoelectric detector and the synchronous signal generator are arranged to be matched with each other, so that the advantage of high detection precision is achieved.
When in use, a coherent light source laser emits narrow-band laser through an optical coupler, the narrow-band laser is divided into two beams of light according to the optical power ratio of 2:8 through a 3dB coupler, 80 percent of the coherent light source enters an acousto-optic modulator and is converted into a pulse light source, the pulse light source enters a first optical circulator after passing through an optical amplifier, the first optical circulator enters a first optical fiber core in an optical cable from an outlet of the first optical circulator, an echo enters a first photoelectric detector, the first photoelectric detector converts an optical signal into an electric signal and then enters a data acquisition card to form a complete path phi-OTDR, the light with the power ratio of 20 percent enters a second optical coupler with the optical power ratio of 1:1, one beam enters a second optical fiber circulator along the clockwise direction, the second optical fiber enters a third 3dB optical coupler after exiting from the second optical circulator and is divided into two beams, the two beams of light respectively enter a first sensing fiber core and a second fiber core and then pass through a sensing area, and are combined into a fourth optical coupler at the, the interference light enters the guide optical fiber and finally is collected by the third photoelectric detector after passing through the third optical circulator, and in the same way, the other light which is separated from the second optical coupler enters the third optical fiber circulator along the anticlockwise direction, firstly enters the fourth optical coupler after passing through the third guide optical core, generates interference at the third optical coupler, is collected by the second photoelectric detector after passing through the second optical circulator, when external disturbance is applied to a certain point in a sensing area, clockwise counterclockwise transmission light generates phase shift quantity with the same characteristic and is respectively arranged at the third optical coupler, the second optical coupler generates interference and is collected by the PIN photoelectric detector and is analyzed and processed by the same upper computer at the front section of the system, phi-OTDR is used as main sensing equipment, vibration is positioned according to the testing result of the phi-OTDR, meanwhile, interference type measurement is used for analyzing the vibration frequency of the position, and the points of the two equipment are integrated, and finally, a good test result can be obtained, and the equipment can obtain better positioning precision and a wider frequency response range under the condition of ensuring moderate sensitivity.
The standard parts used in this application document all can be purchased from the market, and can be customized according to the record of description and drawings, the concrete connection mode of each part all adopts conventional means such as mature bolt, rivet, welding among the prior art, machinery, part and equipment all adopt conventional model among the prior art, the control mode is automatic control through the controller, the control circuit of controller can realize through technical staff's simple programming in this field, belong to the common general knowledge in this field, and the utility model discloses mainly be used for protecting mechanical device, so the utility model discloses no longer explain control mode and circuit connection in detail, and the peripheral controller that mentions in the description can play the control role for the electrical components that this article mention, and this peripheral controller is conventional known equipment.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The principles and embodiments of the present invention have been explained herein using specific examples, which are presented only to assist in understanding the methods and their core concepts. It should be noted that there are infinite specific structures due to the limited character expressions, and it will be apparent to those skilled in the art that various improvements, decorations or changes can be made without departing from the principles of the present invention, and the technical features can be combined in a suitable manner; the application of these modifications, variations or combinations, or the application of the concepts and solutions of the present invention in other contexts without modification, is not intended to be considered as a limitation of the present invention.
Claims (5)
1. The utility model provides an optic fibre vibration detection device that M-Z interferometer and phi-OTDR combine, includes the industrial computer, its characterized in that: the output end of the industrial personal computer is electrically connected with a data acquisition card, the output end of the data acquisition card is electrically connected with a second optical coupler, the output end of the second optical coupler is electrically connected with the first optical coupler, the output end of the first optical coupler is respectively and electrically connected with a laser and a pulse modulator, the output end of the pulse modulator is electrically connected with an optical amplifier, the output end of the optical amplifier is electrically connected with a first optical circulator, the output end of the first optical circulator is electrically connected with the first fiber core, the output end of the data acquisition card is respectively and electrically connected with the second optical circulator, the second photoelectric detector, the third photoelectric detector and the third optical circulator, the output end of the second optical circulator is electrically connected with a third optical coupler, the output end of the third optical coupler is electrically connected with a second fiber core and a third fiber core respectively, and the output end of the third optical circulator is electrically connected with a fourth optical coupler.
2. A combined M-Z interferometer and phi-OTDR fiber vibration detection device according to claim 1, characterized in that: and the output end of the second fiber core is electrically connected with the input end of the third fiber core, and the output ends of the second fiber core and the third fiber core are electrically connected with the input end of the fourth optical coupler.
3. A combined M-Z interferometer and phi-OTDR fiber vibration detection device according to claim 1, characterized in that: the output end of the first optical circulator is electrically connected with a first photoelectric detector, and the output end of the first photoelectric detector is electrically connected with the input end of a data acquisition card.
4. A combined M-Z interferometer and phi-OTDR fiber vibration detection device according to claim 1, characterized in that: and the input end of the second optical circulator is electrically connected with the output end of the second optical coupler.
5. A combined M-Z interferometer and phi-OTDR fiber vibration detection device according to claim 1, characterized in that: the output end of the pulse modulator is electrically connected with a synchronous signal generator, and the output end of the synchronous signal generator is electrically connected with the input end of the data acquisition card.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023223919.7U CN213714536U (en) | 2020-12-28 | 2020-12-28 | Optical fiber vibration detection device combining M-Z interferometer and phi-OTDR |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202023223919.7U CN213714536U (en) | 2020-12-28 | 2020-12-28 | Optical fiber vibration detection device combining M-Z interferometer and phi-OTDR |
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| CN202023223919.7U Active CN213714536U (en) | 2020-12-28 | 2020-12-28 | Optical fiber vibration detection device combining M-Z interferometer and phi-OTDR |
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