CN107356306A - A kind of fiber optic interferometric level sensing device and method based on frequency swept laser demodulation - Google Patents
A kind of fiber optic interferometric level sensing device and method based on frequency swept laser demodulation Download PDFInfo
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- CN107356306A CN107356306A CN201710600344.XA CN201710600344A CN107356306A CN 107356306 A CN107356306 A CN 107356306A CN 201710600344 A CN201710600344 A CN 201710600344A CN 107356306 A CN107356306 A CN 107356306A
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- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000000835 fiber Substances 0.000 title claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 72
- 239000000523 sample Substances 0.000 claims abstract description 37
- BJQHLKABXJIVAM-UHFFFAOYSA-N bis(2-ethylhexyl) phthalate Chemical compound CCCCC(CC)COC(=O)C1=CC=CC=C1C(=O)OCC(CC)CCCC BJQHLKABXJIVAM-UHFFFAOYSA-N 0.000 claims abstract description 27
- 239000011888 foil Substances 0.000 claims abstract description 24
- 230000007246 mechanism Effects 0.000 claims abstract description 17
- 238000005259 measurement Methods 0.000 claims abstract description 9
- 239000013307 optical fiber Substances 0.000 claims abstract description 6
- 230000000052 comparative effect Effects 0.000 claims 1
- 238000010408 sweeping Methods 0.000 claims 1
- 230000008859 change Effects 0.000 description 9
- 238000012544 monitoring process Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000005357 flat glass Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000005622 photoelectricity Effects 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
- G01F23/284—Electromagnetic waves
- G01F23/292—Light, e.g. infrared or ultraviolet
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/30—Assessment of water resources
Abstract
The present invention relates to a kind of fiber optic interferometric level sensing device and method based on frequency swept laser demodulation, device includes frequency swept laser, laser is divided into two-way through coupler caused by laser, transmitted by optical fiber, all the way the first multiple-beam interference is produced by method amber etalon, another way produces the second multiple-beam interference by hydraulic pressure probe, by demodulating the first multiple-beam interference and the second multiple-beam interference, obtain the hydraulic pressure value in hydraulic pressure probe, according to the relation of pressure and water level, you can obtain water level measurements；The hydraulic pressure probe has shell, water pressure foil gauge, Fa-Po cavity and Fa-Po cavity adjustment mechanism, and water pressure foil gauge directly contacts with water, and is connected with Fa-Po cavity adjustment mechanism；When water level changes, water pressure foil gauge experiences SEA LEVEL VARIATION, drives the movement of Fa-Po cavity adjustment mechanism, grows the chamber of Fa-Po cavity and changes therewith so that laser produces the second multiple-beam interference in hydraulic pressure is popped one's head in.
Description
Technical field
The present invention relates to a kind of fiber optic interferometric level sensing device and method based on frequency swept laser demodulation.
Background technology
High-precision level sensor can be used for the change for monitoring various water levels, such as monitoring city river water level situation,
Monitor reservoir level situation, monitoring ocean water level change etc..If not carrying out water level monitoring in advance, when water level reaches warning line
Afterwards, urban flooding can be caused, breached a dyke, the disaster such as tsunami, seriously affect the life security and economic asset safety of the people,
Therefore accurately monitor that various complicated water level conditions are very necessary, and the development of high-accuracy water level sensor is significant.
Level sensor typically has float type water level sensor, pressure type water level sensor, optical fiber level sensor etc. no
Same classification, in disclosed Patent No. CN202974389U Chinese patent, it is proposed that a kind of using the floating of datum level
Minor water-level gauge, the water-level gauge is using mechanical structure sensor, it is necessary to there is logging equipment, it is difficult to operates, it is steady to be only applicable to bank slope
Fixed, the low sand-carrying capacity section of change in bed level very little, limitation are very big.It is special in disclosed Patent No. CN204286550U China
In profit, it is proposed that a kind of pressure type water gauge that can carry out atmospheric pressure compensating, the water-level gauge use circuit structure, including signal to adopt
Collection, signal transacting, power supply unit etc., integrated circuit is complicated, and transmission range is limited, it is impossible to be used in electromagnetic interference is serious, rotten
Under the adverse circumstances such as corrosion is strong；In disclosed Patent No. CN204461547U Chinese patent, it is proposed that a kind of optical fiber is done
Paddle level sensor, using optical fiber sensing technology, construct Michelson interference structure, level measuring is realized by phase demodulating,
But it can only carry out the measurement of dynamic water table change, can not realize the measurement of static water level, have in actual applications necessarily
Limitation.
The content of the invention
For the deficiencies in the prior art, the invention provides a kind of fiber optic interferometric based on frequency swept laser demodulation
Level sensing device, the present invention using etalon, the principle of interference of Fa-Po cavity, with chamber grow by the frequency spacing obtained between adjacent peak
Relation, and etalon chamber length be fixed as known quantity as reference, simply can accurately demodulate Fa-Po cavity chamber length, after
And water level value can be obtained, improve demodulation accuracy.
The technical scheme is that：
A kind of fiber optic interferometric level sensing device based on frequency swept laser demodulation, including laser, caused by laser
Laser is divided into two-way through coupler, is transmitted by optical fiber, produces the first multiple-beam interference by method amber etalon all the way, another
Road produces the second multiple-beam interference by hydraulic pressure probe, by demodulating the first multiple-beam interference and the second multiple-beam interference, obtains
Hydraulic pressure value in hydraulic pressure probe, according to the relation of pressure and water level, you can obtain water level measurements；
The hydraulic pressure probe has shell, water pressure foil gauge, Fa-Po cavity and Fa-Po cavity adjustment mechanism, water pressure foil gauge
Directly contact with water, and be connected with Fa-Po cavity adjustment mechanism；When water level changes, water pressure foil gauge experiences SEA LEVEL VARIATION, band
Dynamic Fa-Po cavity adjustment mechanism movement, grow the chamber of Fa-Po cavity and change therewith so that laser produces light more than second in hydraulic pressure is popped one's head in
Beam interferometer.
Further, the Fa-Po cavity adjustment mechanism uses the sliding bottom being connected with water pressure foil gauge.
Further, the Fa-Po cavity includes the speculum being connected with the sliding bottom, is fixed on setting position in shell
The collimater put, light beam are emitted from collimater, and multiple-beam interference is formed between collimater section and mirror surface.
Further, the hydraulic pressure probe also includes watertight seal, outer cable shell, and watertight seal is arranged on the light of hydraulic pressure probe
Fine arrival end, it is connected with outer cable shell phase, outer cable shell and shell are coaxially connected, and the internal diameter of outer cable shell is more than internal diameter of outer cover.
Further, the light path for the first multiple-beam interference being produced through method amber etalon is additionally provided with the first photodetector.
Further, the light path for the second multiple-beam interference being produced through hydraulic pressure probe is additionally provided with three port circulators and second
Photodetector, the Single port connection coupler of three port circulators, Two-port netwerk connection hydraulic pressure probe, three ports connect the second light
Electric explorer.
Further, the output of the first photodetector demodulates with host computer simultaneously with the output of the second photodetector is
System is connected.
The invention also provides a kind of fiber optic interferometric level sensor method based on frequency swept laser demodulation, including：It will swash
Laser caused by light device is divided into two-way, produces the first multiple-beam interference by method amber etalon all the way, and another way is visited by hydraulic pressure
Head produces the second multiple-beam interference；The first multiple-beam interference and the second multiple-beam interference are demodulated, obtains the hydraulic pressure in hydraulic pressure probe
Value, according to the relation of pressure and water level, you can obtain water level measurements；
The hydraulic pressure is probe internally provided water pressure foil gauge, Fa-Po cavity and a Fa-Po cavity adjustment mechanism, water pressure foil gauge with
Water directly contacts, and is connected with Fa-Po cavity adjustment mechanism；When water level changes, water pressure foil gauge experiences SEA LEVEL VARIATION, drives
Fa-Po cavity adjustment mechanism moves, and grows the chamber of Fa-Po cavity and changes therewith so that laser produces the second multiple beam in hydraulic pressure is popped one's head in
Interference.
Further, the first multiple-beam interference and the second multiple-beam interference are demodulated, obtains the hydraulic pressure value bag in hydraulic pressure probe
Include：
The first multiple-beam interference is demodulated, is obtained as the first relevant light intensity in the interference pattern caused by method amber etalon；
The second multiple-beam interference is demodulated, is obtained by the second relevant light intensity in the caused interference pattern of hydraulic pressure probe；
Described first relevant light intensity and the second relevant light intensity are contrasted, obtain the Fa-Po cavity chamber length in hydraulic pressure probe, root
The hydraulic pressure value in hydraulic pressure probe is obtained according to following formula：
P=C1×L2
Wherein C1The constant determined for mechanical structure.
Further, using pair of the frequency spacing between adjacent two peak value as the first relevant light intensity and the second relevant light intensity
Than item.
Beneficial effects of the present invention：
(1) present invention obtains the frequency spacing and chamber length between adjacent peak using etalon, the principle of interference of Fa-Po cavity
Relation, and etalon chamber length is fixed as known quantity as reference, simply can accurately demodulate Fa-Po cavity in water outlet pressure probe
Chamber length, can then obtain water level value, improve demodulation accuracy.
(2) in the present invention, the water pressure foil gauge of hydraulic pressure probe directly contacts with water, when water level changes, water pressure
Foil gauge experiences SEA LEVEL VARIATION, drives base movement, changes the position of speculum, the distance between collimater and speculum
Therefore change, change the phase of interference signal.Fiber optic interferometric level measuring is realized, improves the sensitivity of level measuring.
Brief description of the drawings
The fiber optic interferometric level sensing device and method structure chart that Fig. 1 is demodulated based on frequency swept laser
The fiber optic interferometric level sensing device and method system block diagram that Fig. 2 is demodulated based on frequency swept laser
Fig. 3 hydraulic pressure sonde configuration figures
Mark in figure：
1. laser, 2. couplers, 3. circulators, 4. hydraulic pressure probe, 5. etalons, 6. photodetectors one, 7. photoelectricity
Detector two, 8. host computer demodulating systems, 9. water pressure foil gauges, 10. shells, 11. bases, 12. outer cable shells, 13. water-stops
Part, 14. collimaters, 15. speculums.
Embodiment：
The invention will be further described with embodiment below in conjunction with the accompanying drawings：
It is noted that described further below is all exemplary, it is intended to provides further instruction to the application.It is unless another
Indicate, all technologies used herein and scientific terminology are with usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singulative
It is also intended to include plural form, additionally, it should be understood that, when in this manual using term "comprising" and/or " bag
Include " when, it indicates existing characteristics, step, operation, device, component and/or combinations thereof.
A kind of exemplary embodiments of the present invention are as shown in figure 1, the fiber optic interferometric level sensor based on frequency swept laser demodulation
Device includes frequency swept laser (1), coupler (2), etalon (3), circulator (4), hydraulic pressure probe (5), the first photodetection
Device (6), the second photodetector (7), host computer demodulating system (8).
Wherein as shown in figure 3, hydraulic pressure probe (5) includes water pressure foil gauge (9), shell (10), base (11), outer cable shell
(12), watertight seal (13), collimater (14), speculum (15).Water pressure foil gauge (9) directly contacts with water, base (11)
It is integral with water pressure foil gauge (9), speculum (15) is installed on base (11), shell (10) is support by collimater
(14) and speculum (15) form Fa-Po cavity mechanical structure, outer cable shell (12) be install armoured cable mechanical structure, armouring
Cable can be applied to sealing of watertight seal (13) realization to this side.
When water level changes, water pressure foil gauge (9) experiences SEA LEVEL VARIATION, drives base (11) mobile, makes speculum
(15) position changes, and therefore the distance between collimater (16) and speculum (15) also change, send out the phase of interference signal
Changing.
As depicted in figs. 1 and 2, the output of laser (1) is connected with the input of coupler (2), the output of coupler (2)
End is divided into two-way, connects etalon (3) all the way and connects photodetector one (6) afterwards, the chamber length of etalon (3) is fixed, another way
Connect 1 pin of circulator (4), the 2 pins connection hydraulic pressure probe (5) of circulator (4), the 3 pins connection photoelectricity of circulator (4)
Detector two (7), photodetector one (6) and photodetector two (7) are connected to host computer demodulating system (8).
A kind of fiber optic interferometric level sensor method based on frequency swept laser demodulation involved in the present invention, using following original
Reason：
Laser uses frequency swept laser, and initial frequency is designated as f0, scan frequency is designated as f, and：
F=f0+kt
Wherein k is scanning step frequency, and t is the time.
In the present embodiment, initial frequency 191200GHz, scanning step frequency are 1GHz, and scan frequency is designated as f：
F=191200GHz+1GHz × t
Wherein t is the time.
The light of laser output is divided into two-way through coupler, reconnects photodetector one after connecting etalon all the way, separately
Circulator pin 1 is connected all the way, and circulator pin 2 connects the collimater in hydraulic pressure probe, and optical signal is in collimater and speculum
Multiple reflections form interference light in the Fa-Po cavity of composition, and circulator pin 3 connects photodetector two.The chamber length of etalon is designated as
L1, and L1For constant, the chamber length of the Fa-Po cavity of collimater and speculum composition is designated as L2。
Etalon is made up of two pieces of flat glass, and the inner surface of two plates is plated with the silverskin or aluminium film of high reflectance, when two tables
During the perfect parallelism of face, light forms multiple-beam interference between the two coated surfaces.
If the incident direction of light is vertical with flat glass, then the plane of etalon two is through the optical path difference of light beam：
ΔL1=2L1
Assuming that two light beams are plane simple harmonic quantity electromagnetic wave, the plane of etalon two is respectively through the field strength expression formula of light beam：
Wherein, E0For constant, n is refractive index, and C is the light velocity,For initial phase.
The plane of etalon two is through the interference signal phase difference of light beam：
The plane of etalon two is through the interference signal amplitude expression formula of light beam：
The plane of etalon two is through the interference strength of light beam：
Wherein I1And I2Represent that the plane of etalon two passes through the light intensity of light beam respectively.
The exchange item signal of the interference strength is：
WhenFor integer when, signal is in peak.
Frequency spacing between adjacent two peak value is：
Wherein, t1And t2Time respectively corresponding to two adjacent peaks.
Work as t=t1When,
Work as t=t2When,
N is integer in formula.
The principle of interference of Fa-Po cavity is identical with this in hydraulic pressure probe, can obtain adjacent two peak value in Fa-Po cavity interference signal
Between frequency spacing be：
Make Δ v1With Δ v2Do than that can obtain：
So L2For：
The pressure formula of water level is：
P=ρ gh
Wherein ρ is the density of water, and g is acceleration of gravity, and h is current level value.
The long L of chamber of the pressure of water level and Fa-Po cavity in hydraulic pressure probe2Relation be：
P=C1×L2
Wherein C1The constant determined for mechanical structure.
Then current level value h is：
The measurement range of water level is determined by scanning step frequency 1GHz and stepping number 5000:
Frequency separation delta v in Fa-Po cavity interference signal between adjacent two peak value2Minimum value be 1GHz × 1=1GHz, most
Big value is 1GHz × 5000=5000GHz, byIt can obtainTherefore the measurement range of water level is
The preferred embodiment of the application is the foregoing is only, is not limited to the application, for the skill of this area
For art personnel, the application can have various modifications and variations.It is all within spirit herein and principle, made any repair
Change, equivalent substitution, improvement etc., should be included within the protection domain of the application.
Claims (10)
- A kind of 1. fiber optic interferometric level sensing device based on frequency swept laser demodulation, it is characterised in that including frequency swept laser, Laser is divided into two-way through coupler caused by laser, is transmitted by optical fiber, produces more than first by method amber etalon all the way Beam interference, another way produces the second multiple-beam interference by hydraulic pressure probe, by demodulating the first multiple-beam interference and more than second Beam interference, the hydraulic pressure value in hydraulic pressure probe is obtained, according to the relation of pressure and water level, you can obtain water level measurements；The hydraulic pressure probe has shell, water pressure foil gauge, Fa-Po cavity and Fa-Po cavity adjustment mechanism, water pressure foil gauge and water Directly contact, and be connected with Fa-Po cavity adjustment mechanism；When water level changes, water pressure foil gauge experiences SEA LEVEL VARIATION, drives method Amber chamber adjustment mechanism moves, and grows the chamber of Fa-Po cavity and changes therewith so that laser produces the second multiple beam in hydraulic pressure is popped one's head in and done Relate to.
- 2. device according to claim 1, it is characterised in that the Fa-Po cavity adjustment mechanism uses and water pressure foil gauge Connected sliding bottom.
- 3. device according to claim 2, it is characterised in that the Fa-Po cavity is anti-including being connected with the sliding bottom Penetrate mirror, be fixed on the collimater of setting position in shell, light beam is emitted from collimater, collimater section and mirror surface it Between form multiple-beam interference.
- 4. device according to claim 1, it is characterised in that the hydraulic pressure probe also includes watertight seal, outer cable shell, water Seal is arranged on the fiber inlet end of hydraulic pressure probe, is connected with outer cable shell phase, outer cable shell and shell are coaxially connected, and outer cable The internal diameter of shell is more than internal diameter of outer cover.
- 5. device according to claim 1, it is characterised in that the light path of the first multiple-beam interference is produced through method amber etalon It is additionally provided with the first photodetector.
- 6. device according to claim 5, it is characterised in that produce the light path of the second multiple-beam interference also through hydraulic pressure probe It is provided with three port circulators and the second photodetector, the Single port connection coupler of three port circulators, Two-port netwerk connection Hydraulic pressure is popped one's head in, and three ports connect the second photodetector.
- 7. device according to claim 6, it is characterised in that the output of the first photodetector and the second photodetector Output simultaneously be connected with host computer demodulating system.
- A kind of 8. fiber optic interferometric level sensor method based on frequency swept laser demodulation, it is characterised in that including：By sweeping laser Laser caused by device is divided into two-way, produces the first multiple-beam interference by method amber etalon all the way, and another way is popped one's head in by hydraulic pressure Produce the second multiple-beam interference；The first multiple-beam interference and the second multiple-beam interference are demodulated, obtains the hydraulic pressure value in hydraulic pressure probe, According to the relation of pressure and water level, you can obtain water level measurements；The hydraulic pressure is probe internally provided water pressure foil gauge, Fa-Po cavity and Fa-Po cavity adjustment mechanism, and water pressure foil gauge and water are straight Contact, and be connected with Fa-Po cavity adjustment mechanism；When water level changes, water pressure foil gauge experiences SEA LEVEL VARIATION, drives method amber Chamber adjustment mechanism moves, and grows the chamber of Fa-Po cavity and changes therewith so that laser produces the second multiple-beam interference in hydraulic pressure is popped one's head in.
- 9. according to the method for claim 8, it is characterised in that the first multiple-beam interference of demodulation and the second multiple-beam interference, The hydraulic pressure value obtained in hydraulic pressure probe includes：The first multiple-beam interference is demodulated, is obtained as the first relevant light intensity in the interference pattern caused by method amber etalon；The second multiple-beam interference is demodulated, is obtained by the second relevant light intensity in the caused interference pattern of hydraulic pressure probe；Described first relevant light intensity and the second relevant light intensity are contrasted, the Fa-Po cavity chamber length in hydraulic pressure probe is obtained, under Formula obtains the hydraulic pressure value in hydraulic pressure probe：P=C1×L2Wherein C1The constant determined for mechanical structure.
- 10. according to the method for claim 9, it is characterised in that using the frequency spacing between adjacent two peak value as first The comparative run of relevant light intensity and the second relevant light intensity.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110132232A (en) * | 2019-06-21 | 2019-08-16 | 珠海任驰光电科技有限公司 | Static leveling device and method based on the weak value amplification of quantum |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5032026A (en) * | 1988-06-03 | 1991-07-16 | Societe Nationale Elf Aquitaine Production Tour Elf | Interferometric sensor and use thereof in an interferometric device |
| US6057911A (en) * | 1997-11-17 | 2000-05-02 | Northrop Grumman Corporation | Fiber optic fabry-perot sensor for measuring absolute strain |
| CN2876724Y (en) * | 2005-10-11 | 2007-03-07 | 赵中华 | Digital optical fiber liquid level/pressure sensor |
| CN101183163A (en) * | 2007-11-21 | 2008-05-21 | 北京理工大学 | Turnning optical fibre method Fabry-perot filter |
| US20090091765A1 (en) * | 2005-10-18 | 2009-04-09 | The Australian National University | Apparatus for Interferometric Sensing |
| CN101709638A (en) * | 2009-11-24 | 2010-05-19 | 山东省科学院激光研究所 | Novel optical fiber temperature and pressure sensor |
| CN102607702A (en) * | 2012-03-21 | 2012-07-25 | 昆山煜肸传感器科技有限公司 | Optical-frequency-domain vernier-method spectrometer with broadband reference light source |
| RU2610382C1 (en) * | 2015-12-28 | 2017-02-09 | Общество С Ограниченной Ответственностью "Научно-Производственное Предприятие "Технология" | Method of adjusting maximum sensitivity of fibre-optic hydrophone |
| CN206905845U (en) * | 2017-07-21 | 2018-01-19 | 吉林大学 | A kind of fiber optic interferometric level sensing device based on frequency swept laser demodulation |
-
2017
- 2017-07-21 CN CN201710600344.XA patent/CN107356306B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5032026A (en) * | 1988-06-03 | 1991-07-16 | Societe Nationale Elf Aquitaine Production Tour Elf | Interferometric sensor and use thereof in an interferometric device |
| US6057911A (en) * | 1997-11-17 | 2000-05-02 | Northrop Grumman Corporation | Fiber optic fabry-perot sensor for measuring absolute strain |
| CN2876724Y (en) * | 2005-10-11 | 2007-03-07 | 赵中华 | Digital optical fiber liquid level/pressure sensor |
| US20090091765A1 (en) * | 2005-10-18 | 2009-04-09 | The Australian National University | Apparatus for Interferometric Sensing |
| CN101183163A (en) * | 2007-11-21 | 2008-05-21 | 北京理工大学 | Turnning optical fibre method Fabry-perot filter |
| CN101709638A (en) * | 2009-11-24 | 2010-05-19 | 山东省科学院激光研究所 | Novel optical fiber temperature and pressure sensor |
| CN102607702A (en) * | 2012-03-21 | 2012-07-25 | 昆山煜肸传感器科技有限公司 | Optical-frequency-domain vernier-method spectrometer with broadband reference light source |
| RU2610382C1 (en) * | 2015-12-28 | 2017-02-09 | Общество С Ограниченной Ответственностью "Научно-Производственное Предприятие "Технология" | Method of adjusting maximum sensitivity of fibre-optic hydrophone |
| CN206905845U (en) * | 2017-07-21 | 2018-01-19 | 吉林大学 | A kind of fiber optic interferometric level sensing device based on frequency swept laser demodulation |
Non-Patent Citations (2)
| Title |
|---|
| 邓元龙等: "基于F-P干涉的强度型光纤压力传感器", 深圳大学学报理工版, vol. 28, no. 1, pages 17 - 22 * |
| 阮驰等: "光纤法布里-珀罗（Fabry-Perot)腔液位传感器", vol. 32, no. 10, pages 1170 - 1173 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110132232A (en) * | 2019-06-21 | 2019-08-16 | 珠海任驰光电科技有限公司 | Static leveling device and method based on the weak value amplification of quantum |
| CN110132232B (en) * | 2019-06-21 | 2023-07-25 | 珠海任驰光电科技有限公司 | Static leveling device and method based on quantum weak value amplification |
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| CN107356306B (en) | 2023-08-11 |
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