CN208367226U - Differential match lattice Neck fiber optic interferometric senses geophone - Google Patents
Differential match lattice Neck fiber optic interferometric senses geophone Download PDFInfo
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- CN208367226U CN208367226U CN201821084229.8U CN201821084229U CN208367226U CN 208367226 U CN208367226 U CN 208367226U CN 201821084229 U CN201821084229 U CN 201821084229U CN 208367226 U CN208367226 U CN 208367226U
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Abstract
The utility model discloses a kind of differential match lattice Neck fiber optic interferometrics to sense geophone, it is related to technical field of optical fiber sensing, it includes narrow linewidth laser, the first photodetector, the second photodetector, 1X2 coupler, the first 2X2 coupler and the 2nd 2X2 coupler, further includes support shaft, mass body, the first fiber optic loop and the second fiber optic loop；First fiber optic loop and the second fiber optic loop are uniformly looped around the position that two close end is leaned on the outside of support shaft respectively；One end of first fiber optic loop is connect by six fibers with another input terminal of the first 2X2 coupler, and the other end of the first fiber optic loop is connect by the 7th optical fiber with another output end of the first 2X2 coupler；One end of second fiber optic loop is connect by the 8th optical fiber with another input terminal of the 2nd 2X2 coupler, and the other end of the second fiber optic loop is connect by the 9th optical fiber with another output end of the 2nd 2X2 coupler；Mass body is slideably positioned in support shaft, and the two sides of mass body are connected with the first fiber optic loop and the second fiber optic loop respectively.
Description
Technical field
The utility model relates to technical field of optical fiber sensing, are specifically a kind of differential match lattice Neck fiber optic interferometric sensings
Geophone.
Background technique
With going deep into for the development of seismic exploration technique, especially high-resolution exploration, to seismic prospecting data collecting
Precision and quality requires also higher and higher, it is desirable that acquisition data have wideband, high-fidelity, high s/n ratio, high dynamic, so as to more preferable
Ground identify geologic structure, lithology, fluid, Fractured Reservoir, improve reservoir location, Reservoir Characters, oil reservoir continuity description and mention
High recovery rate etc..The geophone of one of component as field data collection key, performance it is good with it is bad, will directly close
It is the effect to the acquisition quality of data and geological analysis.
In routine reflection seismic exploration, the frequency range of earthquake significant wave is received generally between 3Hz~300Hz, and
It is required that sensor is linear, stable to the phase of vibration and amplitude-frequency response in this frequency range.In current seismic prospecting
In the wave detector that field uses, induction wave detector, pressure-sensitive geophone and digital sensing can be divided into for working principle
Device is digital detector, currently, it is induction wave detector that dosage is maximum, can also divide conventional wave detector among these and surpass
Grade wave detector etc..
Electromagnetic induction principle is to utilize upper and lower two coil windings on aluminum bobbin, a coasting body is formed, by bullet
Reed is suspended in the magnetic field of permanent magnet generation, and permanent magnet is fixed together with wave detector shell.When wave detector shell with
When earth shock, coil is caused to move relative to permanent magnet, two coils generate induced electromotive force, with wave detector case vibration
Size variation, induced electromotive force also changes therewith, and speed is bigger, and induced potential is also big, when wave detector shakes, in wave detector
Output end exports corresponding electric signal, is transferred to seismic instrument.The connection of two coils should meet: in coiling, one
Coil is just rewound around another coil, and the terminal of coil and the origin or beginning of lower coil are linked togather (Opposite direction connection), up and down
Other two end of coil is as output end.When coil is moved with respect to magnet steel, since the magnetic direction of two coils is on the contrary, institute
It is added in the same direction with the induced potential of two coils of connection.External magnetic field is interfered, the induction of two coils of Opposite direction connection
Potential is reversely offset, and which improves anti-interference abilities.
The permanent magnet of induction wave detector due to by temperature, magnetic influence is big, oxidizable and magnetic field is unstable, earthquake
The sensitivity of wave detector is low, stability and poor repeatability.Site workload is big, and natural frequency selection is more, needs a large amount of inspection
The combination of wave device, arrangement is complicated, and intensity is big.In actual detection operations, geological prospecting personnel need to carry a large amount of measurement equipment,
When especially laying detector array, heavy cable and numerous detectors make us unbearably load.And it detects place and often exists
Among the great Lin of remote mountains, heavy workload, meanwhile, interference of the detector cable vulnerable to external electromagnetic field influences the reliability of data.
Utility model content
In view of the deficiencies in the prior art, the purpose of this utility model is to provide a kind of differential match lattice Neck optical fiber
Interference sensing geophone has the characteristics that high sensitivity, fast response time, dynamic characteristic are good, frequency response bandwidth is big, this
Kind of sensor is not only simple in structure, good economy performance, and has and respond the advantages such as fast, highly reliable, in advanced prediction, petroleum exploration
Etc. application prospect it is very wide.
To achieve the above objectives, the technical scheme adopted by the utility model is that: a kind of differential match lattice Neck fiber optic interferometric biography
Feel geophone, including narrow linewidth laser, the first photodetector, the second photodetector, 1X2 coupler, the first 2X2
Coupler and the 2nd 2X2 coupler, wherein the input terminal of 1X2 coupler is connect by the first optical fiber with narrow linewidth laser；The
One input terminal of one 2X2 coupler is connect by the second optical fiber with an output end of 1X2 coupler, and the one of the first 2X2 coupler
Output end is connect by third optical fiber with the first photodetector；One input terminal of the 2nd 2X2 coupler by the 4th optical fiber with
Another output end of 1X2 coupler connects, and an output end of the 2nd 2X2 coupler passes through the 5th optical fiber and the second photodetector
Connection；It further include support shaft, mass body, the first fiber optic loop and the second fiber optic loop；First fiber optic loop and the second fiber optic loop point
It is not looped around the position that two close end is leaned on the outside of support shaft uniformly；One end of first fiber optic loop passes through six fibers and first
Another input terminal of 2X2 coupler connects, and the other end of the first fiber optic loop is another by the 7th optical fiber and the first 2X2 coupler
Output end connection；One end of second fiber optic loop is connect by the 8th optical fiber with another input terminal of the 2nd 2X2 coupler, the
The other end of two fiber optic loops is connect by the 9th optical fiber with another output end of the 2nd 2X2 coupler；The mass body sliding is set
It is placed in support shaft, and the two sides of mass body are connected with the first fiber optic loop and the second fiber optic loop respectively.
It based on the above technical solution, further include the barrel-shaped shell of stainless steel, the inside of the barrel-shaped shell of the stainless steel is
Vacuum, the support shaft, mass body, the first fiber optic loop and the second fiber optic loop are packaged in the barrel-shaped shell of stainless steel.
Based on the above technical solution, the both ends of the barrel-shaped shell of the stainless steel are respectively arranged with the first protection sleeve pipe
Penetrate the first protection sleeve pipe with the both ends of the second protection sleeve pipe, first fiber optic loop, respectively with six fibers and the 7th light
Fibre is connected；The both ends of second fiber optic loop penetrate the second protection sleeve pipe, are connected respectively with the 8th optical fiber and the 9th optical fiber.
Based on the above technical solution, the first sensing is respectively arranged on the inside of the both ends of the barrel-shaped shell of the stainless steel
Device pedestal and second sensor pedestal, and first sensor pedestal is connect by sealant with the first fiber optic loop, second sensor
Pedestal is connect by sealant with the second fiber optic loop.
Based on the above technical solution, the mass body is the sphere with center cavity.
Based on the above technical solution, the mass body is connected by sealant and the first fiber optic loop and the second fiber optic loop
It connects.
Based on the above technical solution, first optical fiber, the second optical fiber, third optical fiber, the 4th optical fiber, the 5th light
Fibre, six fibers, the 7th optical fiber, the 8th optical fiber, the 9th optical fiber are single mode optical fiber.
Based on the above technical solution, 40 milliwatts that the narrow linewidth laser is used to issue that wavelength to be 1550nm connect
Continuous laser.
Based on the above technical solution, the inside optical power of second optical fiber and the 4th optical fiber is 20 milliwatts.
The utility model has the beneficial effects that:
The utility model using match lattice Neck fiber interference principle, design rules acceleration transducer, sensor be with
Light is measurement medium, using photoelectric device as the sensor of conversion element, it has the brilliances such as non-contact, the fast, reliable performance of response
Characteristic.With the rapid development of Optoelectronics Technology, fiber optic interferometric seismic sensor oneself become various photodetector systems in realize light
The key element of electricity conversion, and occupied an important position in sensor application, wherein being even more in non-contact measurement field
The irreplaceable role of performer.When photoelectric sensor works, photoelectric device is responsible for luminous energy (infra-red radiation, visible light and purple
External radiation) signal is converted to electrical signal.This sensor is not only simple in structure, good economy performance, and has that response is fast, reliability
The advantages such as strong, advanced prediction, in terms of application prospect it is very wide.
Detailed description of the invention
Fig. 1 is the structural representation that differential match lattice Neck fiber optic interferometric senses geophone in the utility model embodiment
Figure.
Appended drawing reference:
1- narrow linewidth laser；The first optical fiber of 2-；3-1X2 coupler；The second optical fiber of 4-；The first 2X2 coupler of 5-；6-
Six fibers；The first protection sleeve pipe of 7-；8- first sensor pedestal；The barrel-shaped shell of 9- stainless steel；10- mass body；11- support shaft；
The second fiber optic loop of 12-；13- second sensor pedestal；The second protection sleeve pipe of 14-；The 8th optical fiber of 15-；The 9th optical fiber of 16-；17-
One fiber optic loop；The 2nd 2X2 coupler of 18-；The 4th optical fiber of 19-；The 5th optical fiber of 20-；The 7th optical fiber of 21-；22- third optical fiber；23-
First photodetector；The second photodetector of 24-.
Specific embodiment
The embodiments of the present invention are described below in detail, the embodiment described example is shown in the accompanying drawings, wherein from beginning
Same or similar element or element with the same or similar functions are indicated to same or similar label eventually.
In the description of the present invention, it should be noted that for the noun of locality, if any term " center ", " laterally
(X) ", " longitudinal (Y) ", " vertical (Z) ", " length ", " width ", " thickness ", "upper", "lower", "front", "rear", "left", "right",
The indicating positions such as "vertical", "horizontal", "top", "bottom", "inner", "outside", " clockwise ", " counterclockwise " and positional relationship be based on
Orientation or positional relationship shown in the drawings is merely for convenience of narration the utility model and simplifies description, rather than instruction or dark
Showing signified device or element must have a particular orientation, be constructed and operated with particular orientation, should not be understood as limiting this reality
With novel specific protection scope.
In addition, being used for description purposes only if any term " first ", " second ", it is not understood to indicate or imply relatively heavy
The property wanted or the quantity for implicitly indicating technical characteristic." first " is defined as a result, " second " feature can be expressed or implicit include
One or more this feature, in the utility model description, " several ", " several " are meant that two or more, remove
It is non-separately to have clearly specific restriction.
Made below with reference to the attached drawing of specification by being further described to specific embodiment of the present utility model
The technical solution of the utility model and its benefits are clearer.Describing embodiment below with reference to attached drawing is to show
Example property, it is intended to explain the utility model, and should not be understood as limiting the present invention.
Shown in Figure 1, the utility model embodiment provides a kind of differential match lattice Neck fiber optic interferometric sensing earthquake inspection
Wave device, including narrow linewidth laser 1, the first photodetector 23, the second photodetector 24,1X2 coupler 3, the first 2X2 coupling
Clutch 5 and the 2nd 2X2 coupler 18, wherein the input terminal of 1X2 coupler 3 is connected by the first optical fiber 2 with narrow linewidth laser 1
It connects；One input terminal of the first 2X2 coupler 5 is connect by the second optical fiber 4 with an output end of 1X2 coupler 3, the first 2X2 coupling
One output end of clutch 5 is connect by third optical fiber 22 with the first photodetector 23；One input terminal of the 2nd 2X2 coupler 18
It is connect by the 4th optical fiber 19 with another output end of 1X2 coupler 3, an output end of the 2nd 2X2 coupler 18 passes through the 5th
Optical fiber 20 is connect with the second photodetector 24；It further include support shaft 11, mass body 10, the first fiber optic loop 17 and the second fiber optic loop
12；
First fiber optic loop 17 and the second fiber optic loop 12 are uniformly looped around the position that two close end is leaned on the outside of support shaft 11 respectively；The
One end of one fiber optic loop 17 is connect by six fibers 6 with another input terminal of the first 2X2 coupler 5, the first fiber optic loop 17
The other end is connect by the 7th optical fiber 21 with another output end of the first 2X2 coupler 5；One end of second fiber optic loop 12 passes through the
Eight optical fiber 15 are connect with another input terminal of the 2nd 2X2 coupler 18, and the other end of the second fiber optic loop 12 passes through the 9th optical fiber 16
It is connect with another output end of the 2nd 2X2 coupler 18；
Mass body 10 is slideably positioned in support shaft 11, and the two sides of mass body 10 respectively with the first fiber optic loop 17 and the second light
Fine ring 12 is connected.Specifically, mass body 10 is connect by sealant with the first fiber optic loop 17 and the second fiber optic loop 12.
First via match lattice Neck fibre optic interferometer is by the first 2X2 coupler 5, six fibers 6, the first fiber optic loop 17, the
Seven optical fiber 21 are constituted, for the weak vibration of perceived quality body 10.
Bis- Lu Saige Neck fibre optic interferometer be by the 2nd 2X2 coupler 18, the 8th optical fiber 15, the second fiber optic loop 12,
9th optical fiber 16 is constituted, for the weak vibration of perceived quality body 10.
Helical annular the first fiber optic loop 17, the second fiber optic loop 12 and mass block 10 constitute match lattice Neck interferometer sensor,
Vibration Signal in Frequency Domain can make mass block 10 generate sliding motion, stretch or the first fiber optic loop 17 of compression, the second fiber optic loop 12 generate
Reciprocal micromotion, match lattice Neck interferometer can generate interference signal.
Specifically, further include the barrel-shaped shell 9 of stainless steel, the inside of the barrel-shaped shell 9 of the stainless steel is vacuum, support shaft 11,
Mass body 10, the first fiber optic loop 17 and the second fiber optic loop 12 are packaged in the barrel-shaped shell 9 of stainless steel, are carried out in sensor internal
Isolation.
Specifically, the both ends of the barrel-shaped shell 9 of stainless steel are respectively arranged with the first protection sleeve pipe 7 and the second protection sleeve pipe 14,
The both ends of first fiber optic loop 17 penetrate the first protection sleeve pipe 7, are connected respectively with six fibers 6 and the 7th optical fiber 21；Second light
The both ends of fine ring 12 penetrate the second protection sleeve pipe 14, are connected respectively with the 8th optical fiber 15 and the 9th optical fiber 16.
Specifically, being respectively arranged with first sensor pedestal 8 and second sensor on the inside of the both ends of the barrel-shaped shell 9 of stainless steel
Pedestal 13, and first sensor pedestal 8 is connect by sealant with the first fiber optic loop 17, second sensor pedestal 13 passes through sealing
Glue is connect with the second fiber optic loop 12.
Specifically, mass body 10 is the sphere with center cavity, can be moved back and forth along support shaft 11.
Specifically, the first optical fiber 2, the second optical fiber 4, third optical fiber 22, the 4th optical fiber 19, the 5th optical fiber 20, six fibers
6, the 7th optical fiber 21, the 8th optical fiber 15, the 9th optical fiber 16, the first fiber optic loop 17 and the second fiber optic loop 12 are single mode optical fiber.
Specifically, narrow linewidth laser 1 is used to issue the 40 milliwatt continuous lasers that wavelength is 1550nm.Second optical fiber, 4 He
The inside optical power of 4th optical fiber 19 is 20 milliwatts.
The working principle of the utility model are as follows:
Narrow linewidth laser 1 issues the 40 milliwatt continuous lasers that wavelength is 1550nm and enters the first optical fiber 2, the first optical fiber 2
Internal continuous laser generates beam splitting, the laser of power-take-off each 50%, into 4 He of the second optical fiber after entering 1X2 coupler 3
4th optical fiber 19, the second optical fiber 4 and 19 inside optical power of the 4th optical fiber are 20 milliwatts.
Narrow-linewidth laser inputs the second optical fiber 4, and into the input terminal of 2X2 coupler 5, laser passes through the first 2X2 coupler
5, it is exported respectively in six fibers 6 and 21 end of the 7th optical fiber, light is to transmit in opposite directions inside six fibers 6 and the 7th optical fiber 21,
In sensor internal the first fiber optic loop 17 of composition, the first fiber optic loop 17 is a ring structure for six fibers 6 and the 7th optical fiber 21
Match lattice Neck interferometer, it is dry that faint stretching or compression can make the laser signal inside the first fiber optic loop 17 generate match lattice Neck
Effect is related to, interference light is output to the first photodetector 23 by third optical fiber 22, converts optical signals into electric signal output.
The another way narrow-linewidth laser of 1X2 coupler 3 inputs the 4th optical fiber 19, into the input of the 2nd 2X2 coupler 18
End, laser pass through the 2nd 2X2 coupler 18, respectively the 8th optical fiber 15,16 end of the 9th optical fiber export, light the 8th optical fiber 15,
It is to transmit in opposite directions inside 9th optical fiber 16, the 8th optical fiber 15, the 9th optical fiber 16 form the second fiber optic loop 12 in sensor internal, the
Two fiber optic loops 12 are the match lattice Neck interferometers an of ring structure, and faint stretching or compression can make inside the second fiber optic loop 12
Laser signal generate match lattice Neck interference effect, interference light is output to the second photodetector 24 by the 5th optical fiber 20, will
Optical signal conversion is exported at electric signal.
Sensor design uses differential match lattice Neck interferometer structure, and the first fiber optic loop 17 and the second fiber optic loop 12 constitute difference
The earthquake wave amplitude and frequency that dynamic light arm perception compression respectively and is stretched.
In the description of specification, reference term " one embodiment ", " preferably ", " example ", " specific example " or " one
The description of a little examples " etc. means particular features, structures, materials, or characteristics described in conjunction with this embodiment or example, is contained in
In at least one embodiment or example of the utility model, in the present specification not necessarily for the schematic representation of above-mentioned term
Refer to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be any one
It is combined in a suitable manner in a or multiple embodiments or example.
The utility model is not limited to above embodiment, for those skilled in the art, not
Under the premise of being detached from the utility model principle, several improvements and modifications can also be made, these improvements and modifications are also considered as this reality
Within novel protection scope.The content being not described in detail in this specification belongs to well known to professional and technical personnel in the field
The prior art.
Claims (9)
1. a kind of differential match lattice Neck fiber optic interferometric senses geophone, including narrow linewidth laser (1), the first photodetection
Device (23), the second photodetector 24,1X2 coupler (3), the first 2X2 coupler (5) and the 2nd 2X2 coupler (18),
In, the input terminal of 1X2 coupler (3) is connect by the first optical fiber (2) with narrow linewidth laser (1)；First 2X2 coupler (5)
An input terminal connect with an output end of 1X2 coupler (3) by the second optical fiber (4), the one of the first 2X2 coupler (5) is defeated
Outlet is connect by third optical fiber (22) with the first photodetector (23)；One input terminal of the 2nd 2X2 coupler (18) passes through
4th optical fiber (19) is connect with another output end of 1X2 coupler (3), and an output end of the 2nd 2X2 coupler (18) passes through the
Five optical fiber (20) are connect with the second photodetector 24；It is characterized by also including support shafts (11), mass body (10), first
Fiber optic loop (17) and the second fiber optic loop (12)；
First fiber optic loop (17) and the second fiber optic loop (12) are uniformly looped around on the outside of support shaft (11) respectively by two close end
Position；One end of first fiber optic loop (17) is connected by another input terminal of six fibers (6) and the first 2X2 coupler (5)
It connects, the other end of the first fiber optic loop (17) is connect by the 7th optical fiber (21) with another output end of the first 2X2 coupler (5)；
One end of second fiber optic loop (12) is connect by the 8th optical fiber (15) with another input terminal of the 2nd 2X2 coupler (18),
The other end of second fiber optic loop (12) is connect by the 9th optical fiber (16) with another output end of the 2nd 2X2 coupler (18)；
The mass body (10) is slideably positioned in support shaft (11), and the two sides of mass body (10) respectively with the first fiber optic loop (17)
It is connected with the second fiber optic loop (12).
2. differential match lattice Neck fiber optic interferometric as described in claim 1 senses geophone, it is characterised in that: further include not
It becomes rusty steel drum shape shell (9), the inside of the barrel-shaped shell of the stainless steel (9) is vacuum, the support shaft (11), mass body (10), the
One fiber optic loop (17) and the second fiber optic loop (12) are packaged in the barrel-shaped shell of stainless steel (9).
3. differential match lattice Neck fiber optic interferometric as claimed in claim 2 senses geophone, it is characterised in that: described stainless
The both ends of steel drum shape shell (9) are respectively arranged with the first protection sleeve pipe (7) and the second protection sleeve pipe (14), first fiber optic loop
(17) both ends penetrate the first protection sleeve pipe (7), are connected respectively with six fibers (6) and the 7th optical fiber (21)；Described second
The both ends of fiber optic loop (12) penetrate the second protection sleeve pipe (14), are connected respectively with the 8th optical fiber (15) and the 9th optical fiber (16).
4. differential match lattice Neck fiber optic interferometric as claimed in claim 2 senses geophone, it is characterised in that: described stainless
First sensor pedestal (8) and second sensor pedestal (13), and first are respectively arranged on the inside of the both ends of steel drum shape shell (9)
Sensor base (8) is connect by sealant with the first fiber optic loop (17), and second sensor pedestal (13) passes through sealant and the
Two fiber optic loops (12) connection.
5. differential match lattice Neck fiber optic interferometric as described in claim 1 senses geophone, it is characterised in that: the quality
Body (10) is the sphere with center cavity.
6. differential match lattice Neck fiber optic interferometric as described in claim 1 senses geophone, it is characterised in that: the quality
Body (10) is connect by sealant with the first fiber optic loop (17) and the second fiber optic loop (12).
7. differential match lattice Neck fiber optic interferometric as described in claim 1 senses geophone, it is characterised in that: described first
Optical fiber (2), the second optical fiber (4), third optical fiber (22), the 4th optical fiber (19), the 5th optical fiber (20), six fibers (6), the 7th light
Fine (21), the 8th optical fiber (15), the 9th optical fiber (16) are single mode optical fiber.
8. differential match lattice Neck fiber optic interferometric as described in claim 1 senses geophone, it is characterised in that: the narrow line
Wide laser (1) is used to issue the 40 milliwatt continuous lasers that wavelength is 1550nm.
9. differential match lattice Neck fiber optic interferometric as described in claim 1 senses geophone, it is characterised in that: described second
The inside optical power of optical fiber (4) and the 4th optical fiber (19) is 20 milliwatts.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821084229.8U CN208367226U (en) | 2018-07-10 | 2018-07-10 | Differential match lattice Neck fiber optic interferometric senses geophone |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821084229.8U CN208367226U (en) | 2018-07-10 | 2018-07-10 | Differential match lattice Neck fiber optic interferometric senses geophone |
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| CN208367226U true CN208367226U (en) | 2019-01-11 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108627869A (en) * | 2018-07-10 | 2018-10-09 | 湖北文索光电科技有限公司 | Differential match lattice Neck fiber optic interferometric senses geophone |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108627869A (en) * | 2018-07-10 | 2018-10-09 | 湖北文索光电科技有限公司 | Differential match lattice Neck fiber optic interferometric senses geophone |
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Granted publication date: 20190111 Termination date: 20210710 |