CN108627869A - 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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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/16—Receiving elements for seismic signals; Arrangements or adaptations of receiving elements
- G01V1/18—Receiving elements, e.g. seismometer, geophone or torque detectors, for localised single point measurements
- G01V1/181—Geophones
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- General Life Sciences & Earth Sciences (AREA)
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Abstract
The invention 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 couplers, the first 2X2 couplers and the 2nd 2X2 couplers, 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 couplers, 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 couplers；One end of second fiber optic loop is connect by the 8th optical fiber with another input terminal of the 2nd 2X2 couplers, 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 couplers；Mass body is slideably positioned in support shaft, and the both sides of mass body are connected with the first fiber optic loop and the second fiber optic loop respectively.
Description
Technical field
The present invention relates to technical field of optical fiber sensing, are specifically a kind of differential match lattice Neck fiber optic interferometric sensing earthquakes
Wave detector.
Background technology
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 gathered data has 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 carry
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 gathered data quality 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 to the phase of vibration and amplitude-frequency response in this frequency range, stablizes.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 operation 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 a coasting body to be formed, by bullet using upper and lower two coil windings on aluminum bobbin
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 be moved 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
Wave device combines, and 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, detector cable is easily interfered by external electromagnetic field, and the reliability of data is influenced.
Invention content
In view of the deficiencies in the prior art, the purpose of the present invention is to provide a kind of differential match lattice Neck fiber optic interferometrics
Geophone is sensed, has the characteristics that high sensitivity, fast response time, dynamic characteristic are good, frequency response bandwidth is big, this biography
Sensor is not only simple in structure, good economy performance, and with the advantages such as fast, highly reliable are responded, in the side such as advanced prediction, petroleum exploration
Face application prospect is very wide.
To achieve the above objectives, the technical solution adopted by the present invention is that：A kind of differential match lattice Neck fiber optic interferometric sensing ground
Shake wave detector, including narrow linewidth laser, the first photodetector, the second photodetector, 1X2 couplers, the first 2X2 coupling
Device and the 2nd 2X2 couplers, wherein the input terminal of 1X2 couplers is connect by the first optical fiber with narrow linewidth laser；First
One input terminal of 2X2 couplers is connect by the second optical fiber with an output end of 1X2 couplers, and the one of the first 2X2 couplers is defeated
Outlet is connect by third optical fiber with the first photodetector；One input terminal of the 2nd 2X2 couplers passes through the 4th optical fiber and 1X2
Another output end of coupler connects, and an output end of the 2nd 2X2 couplers is connected by the 5th optical fiber and the second photodetector
It connects；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 difference
Uniformly it is looped around the position that two close end is leaned on the outside of support shaft；One end of first fiber optic loop passes through six fibers and the first 2X2
Another input terminal of coupler connects, and the other end of the first fiber optic loop is another defeated by the 7th optical fiber and the first 2X2 couplers
Outlet connects；One end of second fiber optic loop is connect by the 8th optical fiber with another input terminal of the 2nd 2X2 couplers, and second
The other end of fiber optic loop is connect by the 9th optical fiber with another output end of the 2nd 2X2 couplers；The mass body sliding setting
In support shaft, and the both sides of mass body are connected with the first fiber optic loop and the second fiber optic loop respectively.
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, it is respectively arranged with the first sensing 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 fluid sealant with the first fiber optic loop, second sensor
Pedestal is connect by fluid 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 fluid 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, the narrow linewidth laser is used to send out 40 milliwatts that wavelength is 1550nm and connects
Continuous laser.
Based on the above technical solution, the inside luminous power of second optical fiber and the 4th optical fiber is 20 milliwatts.
The beneficial effects of the present invention are：
The present invention is using match lattice Neck fiber interference principle, and design rules acceleration transducer, sensor is to be with light
Measure medium, using photoelectric device as the sensor of conversion element, it has the excellent properties such as non-contact, the fast, dependable performance of response.
With the rapid development of Optoelectronics Technology, fiber optic interferometric seismic sensor oneself become various photodetector systems in realize opto-electronic conversion
Key element, and occupied an important position in sensor application, wherein being even more performer in non-contact measurement field
Irreplaceable role.When photoelectric sensor works, photoelectric device is responsible for luminous energy (infra-red radiation, visible light and ultraviolet radioactive)
Signal is converted to electrical signal.This sensor is not only simple in structure, good economy performance, and fast, highly reliable etc. excellent with responding
Gesture, it is very wide in advanced prediction, petroleum exploration etc. application prospect.
Description of the drawings
Fig. 1 is the structural schematic diagram that differential match lattice Neck fiber optic interferometric senses geophone in the embodiment of the present invention.
Reference numeral：
1- narrow linewidth lasers；The first optical fiber of 2-；3-1X2 couplers；The second optical fiber of 4-；The first 2X2 couplers of 5-；6-
Six fibers；The first protection sleeve pipes of 7-；8- first sensor pedestals；The barrel-shaped shell of 9- stainless steels；10- mass bodies；11- support shafts；
The second fiber optic loops of 12-；13- second sensor pedestals；The second protection sleeve pipes of 14-；The 8th optical fiber of 15-；The 9th optical fiber of 16-；17-
One fiber optic loop；The 2nd 2X2 couplers 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 photodetectors of 24-.
Specific implementation mode
The embodiment of the present invention is described below in detail, the embodiment described example is shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.
In the description of the present invention, it should be noted that " laterally (X) ", " vertical if any term "center" for the noun of locality
To (Y) ", " vertical (Z) ", " length ", " width ", " thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical",
The indicating positions such as "horizontal", "top", "bottom", "inner", "outside", " clockwise ", " counterclockwise " and position relationship is based on attached drawing institutes
The orientation or positional relationship shown is merely for convenience of the narration present invention and simplifies description, do not indicate or imply the indicated dress
It sets or element must have a particular orientation, be constructed and be operated with particular orientation, should not be understood as the specific guarantor of the limitation present invention
Protect range.
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 present description, " several ", " several " are meant that two or more, unless separately
There is clearly specific restriction.
With reference to the attached drawing of specification, it is further described by the specific implementation mode to the present invention, makes this hair
Bright technical solution and advantage is clearer, clear.Embodiment is described below with reference to attached drawing to be exemplary, purport
It is explaining the present invention, and is being not considered as limiting the invention.
Shown in Figure 1, an embodiment of the present invention provides a kind of differential match lattice Neck fiber optic interferometrics to sense geophone,
Including narrow linewidth laser 1, the first photodetector 23, the second photodetector 24,1X2 couplers 3, the first 2X2 couplers 5
With the 2nd 2X2 couplers 18, wherein the input terminal of 1X2 couplers 3 is connect by the first optical fiber 2 with narrow linewidth laser 1；The
One input terminal of one 2X2 couplers 5 is connect by the second optical fiber 4 with an output end of 1X2 couplers 3, the first 2X2 couplers 5
An output end connect with the first photodetector 23 by third optical fiber 22；One input terminal of the 2nd 2X2 couplers 18 passes through
4th optical fiber 19 is connect with another output end of 1X2 couplers 3, and an output end of the 2nd 2X2 couplers 18 passes through the 5th optical fiber
20 connect with the second photodetector 24；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 in 11 outside of support shaft respectively；The
One end of one fiber optic loop 17 is connect by six fibers 6 with another input terminal of the first 2X2 couplers 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 couplers 5；One end of second fiber optic loop 12 passes through
Eight optical fiber 15 are connect with another input terminal of the 2nd 2X2 couplers 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 couplers 18；
Mass body 10 is slideably positioned in support shaft 11, and the both 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 fluid 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 couplers 5, six fibers 6, the first fiber optic loop 17, the
Seven optical fiber 21 are constituted, and are used for the weak vibration of perceived quality body 10.
Bis- Lu Saige Neck fibre optic interferometers be by the 2nd 2X2 couplers 18, the 8th optical fiber 15, the second fiber optic loop 12,
9th optical fiber 16 is constituted, and is used 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 will produce interference signal.
Specifically, further include the barrel-shaped shell 9 of stainless steel, the inside of the barrel-shaped shell of the stainless steel 9 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 of stainless steel 9, are carried out in sensor internal
Isolation.
Specifically, the both ends of the barrel-shaped shell of stainless steel 9 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 of stainless steel 9
Pedestal 13, and first sensor pedestal 8 is connect by fluid 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 send out the 40 milliwatt continuous lasers that wavelength is 1550nm.Second optical fiber, 4 He
The inside luminous power of 4th optical fiber 19 is 20 milliwatts.
The operation principle of the present invention is that：
Narrow linewidth laser 1 sends out 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 couplers 3
4th optical fiber 19, the second optical fiber 4 and 19 inside luminous 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 couplers 5, laser passes through the first 2X2 couplers
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,
Six fibers 6 and the 7th optical fiber 21 form the first fiber optic loop 17 in sensor internal, and the first fiber optic loop 17 is a loop configuration
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 couplers 3 inputs the 4th optical fiber 19, into the input of the 2nd 2X2 couplers 18
End, laser pass through the 2nd 2X2 couplers 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 of a loop configuration, 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, general
Optical signalling is converted into electric signal output.
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 of the present invention or example, the schematic representation of above-mentioned term is not necessarily referred in the present specification
It is identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can at any one or
It is combined in a suitable manner in multiple embodiments or example.
The present invention is not limited to the above-described embodiments, for those skilled in the art, is not departing from
Under the premise of the principle of the invention, several improvements and modifications can also be made, these improvements and modifications are also considered as the protection of the present invention
Within the scope of.The content not being described in detail in this specification belongs to the prior art well known to professional and technical personnel in the field.
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 couplers (3), the first 2X2 couplers (5) and the 2nd 2X2 couplers (18),
In, the input terminal of 1X2 couplers (3) is connect by the first optical fiber (2) with narrow linewidth laser (1)；First 2X2 couplers (5)
An input terminal connect with an output end of 1X2 couplers (3) by the second optical fiber (4), the one of the first 2X2 couplers (5) is defeated
Outlet is connect by third optical fiber (22) with the first photodetector (23)；One input terminal of the 2nd 2X2 couplers (18) passes through
4th optical fiber (19) is connect with another output end of 1X2 couplers (3), and an output end of the 2nd 2X2 couplers (18) passes through
Five optical fiber (20) are connect with the second photodetector 24；It is characterized in that：Further include support shaft (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 couplers (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 couplers (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 couplers (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 couplers (18)；
The mass body (10) is slideably positioned in support shaft (11), and the both 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
Become rusty steel drum shape shell (9), and 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：It is 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：It is described stainless
It is respectively arranged with first sensor pedestal (8) and second sensor pedestal (13), and first on the inside of the both ends of steel drum shape shell (9)
Sensor base (8) is connect by fluid sealant with the first fiber optic loop (17), and second sensor pedestal (13) passes through fluid sealant and
Two fiber optic loops (12) connect.
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 fluid 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 send out 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 luminous power of optical fiber (4) and the 4th optical fiber (19) is 20 milliwatts.
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| CN201810749091.7A CN108627869A (en) | 2018-07-10 | 2018-07-10 | Differential match lattice Neck fiber optic interferometric senses geophone |
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| CN201810749091.7A CN108627869A (en) | 2018-07-10 | 2018-07-10 | Differential match lattice Neck fiber optic interferometric senses geophone |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020243993A1 (en) * | 2019-06-06 | 2020-12-10 | 山东科技大学 | Photoelectric composite geophone and detection system |
| CN112229285A (en) * | 2020-11-05 | 2021-01-15 | 中国十七冶集团有限公司 | Tunnel blasting excavation earth surface vibration intensity detection device and detection method thereof |
Citations (7)
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| CN112229285A (en) * | 2020-11-05 | 2021-01-15 | 中国十七冶集团有限公司 | Tunnel blasting excavation earth surface vibration intensity detection device and detection method thereof |
| CN112229285B (en) * | 2020-11-05 | 2023-01-17 | 中国十七冶集团有限公司 | Tunnel blasting excavation earth surface vibration intensity detection device and detection method thereof |
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