CN106289599A - Multi parameter intallingent comprehensive monitor system for hazardous gas - Google Patents
Multi parameter intallingent comprehensive monitor system for hazardous gas Download PDFInfo
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- CN106289599A CN106289599A CN201610567226.9A CN201610567226A CN106289599A CN 106289599 A CN106289599 A CN 106289599A CN 201610567226 A CN201610567226 A CN 201610567226A CN 106289599 A CN106289599 A CN 106289599A
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- 231100001261 hazardous Toxicity 0.000 title claims abstract description 11
- 239000000835 fiber Substances 0.000 claims abstract description 37
- 229910052581 Si3N4 Inorganic materials 0.000 claims abstract description 9
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000002131 composite material Substances 0.000 claims abstract description 8
- BPUBBGLMJRNUCC-UHFFFAOYSA-N oxygen(2-);tantalum(5+) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Ta+5].[Ta+5] BPUBBGLMJRNUCC-UHFFFAOYSA-N 0.000 claims abstract description 8
- PBCFLUZVCVVTBY-UHFFFAOYSA-N tantalum pentoxide Inorganic materials O=[Ta](=O)O[Ta](=O)=O PBCFLUZVCVVTBY-UHFFFAOYSA-N 0.000 claims abstract description 8
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 229910052715 tantalum Inorganic materials 0.000 claims 1
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 claims 1
- 230000008859 change Effects 0.000 abstract description 13
- 230000008901 benefit Effects 0.000 abstract description 7
- 230000005611 electricity Effects 0.000 abstract description 7
- 239000002360 explosive Substances 0.000 abstract description 6
- 239000003949 liquefied natural gas Substances 0.000 description 84
- 238000003860 storage Methods 0.000 description 39
- 239000007789 gas Substances 0.000 description 32
- 238000012544 monitoring process Methods 0.000 description 31
- 239000013307 optical fiber Substances 0.000 description 30
- 238000000034 method Methods 0.000 description 19
- 230000008569 process Effects 0.000 description 10
- 238000005516 engineering process Methods 0.000 description 9
- 230000003287 optical effect Effects 0.000 description 8
- 230000005540 biological transmission Effects 0.000 description 7
- 230000006835 compression Effects 0.000 description 7
- 238000007906 compression Methods 0.000 description 7
- 239000007788 liquid Substances 0.000 description 7
- 238000011897 real-time detection Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 241000208340 Araliaceae Species 0.000 description 2
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 2
- 235000003140 Panax quinquefolius Nutrition 0.000 description 2
- 238000000205 computational method Methods 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 235000008434 ginseng Nutrition 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000008447 perception Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000005612 types of electricity Effects 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- -1 and its physics Substances 0.000 description 1
- 210000004556 brain Anatomy 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000010259 detection of temperature stimulus Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000009969 flowable effect Effects 0.000 description 1
- 238000004817 gas chromatography Methods 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000003915 liquefied petroleum gas Substances 0.000 description 1
- 210000005036 nerve Anatomy 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
- G01L1/242—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
The present invention discloses a kind of multi parameter intallingent comprehensive monitor system for hazardous gas, including: LNG tank, modulation /demodulation instrument, it is respectively arranged in LNG tank top and a F P cavity pressure sensor of bottom, the 2nd F P cavity pressure sensor；Oneth F P cavity pressure sensor, the 2nd F P cavity pressure sensor farther include diaphragm, chamber body, light-conductive optic fibre and collimator tube；Described modulation /demodulation instrument receives from a F P cavity pressure sensor, the induced signal of the 2nd F P cavity pressure sensor；Composite dielectric film is added formed by silicon nitride layer, tantalum pentoxide stacking, described silicon nitride layer and film contact, and this tantalum pentoxide layer is towards groove.The present invention detects the change of light wave parameter, can calculate and obtain the extraneous parameter causing light wave parameter to change, under the conditions of the very rugged environment such as inflammable and explosive, high pressure, high temperature and strong electromagnetic, there is the advantage that other electricity pressure transducer is incomparable.
Description
Technical field
The present invention relates to a kind of multi parameter intallingent comprehensive monitor system for hazardous gas, belong to LNG gas station safety
Monitoring field.
Background technology
Current domestic LNG gas station stocks up and all joins by quality according to country's convention, generally use weighbridge calculate loaded vehicle with
Empty wagons difference draws entry log.Use the weight bridge weighing mode that non-immediate formula is measured to the gage work during production and sales
Bring great inconvenience, through analyzing it is considered that: in LNG sells metering, be primarily present at present problems with:
(1) distribution time extends: LNG tank car to complete twice to the Metrology Division (weighbridge) near gas station and to weigh, and makes to join
Send promptness to be affected, affect work efficiency.
(2) accurate measurement degree is low: metering weighbridge precision is affected by factors to be difficult to reach higher degree, typically exists
About 5%.
(3) metering process is difficult to control to: owing to cannot implement real-time monitoring in the metering process of LNG, complete a business transaction process
Many uncontrollable factors such as the error of middle measurer itself, temperature, pressure, anthropic factor.Cannot protect during making to complete a business transaction
The accuracy of card metering.
(4) process of stocking up is difficult to manage: when LNG passes in and out goods, metering can not monitor when completing a business transaction in real time, and management personnel can not
The overall process that real-time remote monitoring is stocked up, it is impossible to control metering process practical situation, cause metering, add up, manage delayed
Property, it is impossible to reach the requirement of fine-grained management.
(5) existing measuring equipment is affected by the external environment and causes error in dipping problem.
Owing to not having " passive on-line densimeter, piezometer, thermometer " cannot seed ginsengs many to LNG in storage tank at present both at home and abroad
Amount is measured in real time, and metering affects the accuracy of LNG storage tank medium metering indirectly.
In storage tank, the density of LNG cannot directly read at present, and the density of LNG depends on the component of LNG, and usually 430
～470kg/m3, if methane content is the highest, then density is the least；Density or the function of temperature, if temperature is the highest, density is the least,
Its variable gradient is about 1.35kg/ (m3/ DEG C).During actual production manages, the real-time of LNG density is detected as can be seen here
Most important.
Current domestic utilization obtains the component of LNG through gas chromatography analysis, is tried to achieve by calculating.Mostly according to GB/
The computational methods determined in the ISO 6578 used in T19204 2003 " general characteristic of liquefied natural gas "；Or use GB/
T2106B 2007 " liquefied natural gas density calculates model specification " gas station LNG density value calculates method.Above computational methods are all
It is that its accuracy is difficult to ensure that by calculating the density indirectly obtaining LNG.And the batch of source of the gas when unloading liquid in real work,
Producer's difference is taked again lack of standardization to unload liquid mode, causes medium in storage tank to be layered, rollover phenomenon, brings to gage work
Interference, causes the inaccuracy of metering greatly.
LNG is flammable explosive gas, and its physics, chemical feature make LNG tank body must be in Cryo Heat Insulation in storage and transport process
Under the conditions of store.For this when designing LNG intelligent Detection, the physical quantity such as the density of medium, volume, quality in storage tank
Detection sensor must use passive device, it is ensured that the safety of work.
Although conventional pressure sensor based on electrical principles or tank gage can realize LNG storage tank liquid level or pressure
Continuous monitoring, but field monitoring needs to introduce electricity, and LNG gas station belongs to inflammable and explosive hazardous environment, therefore, traditional electricity
Pressure transducer or tank gage are not suitable for the safety monitoring of LNG gas station.
Summary of the invention
The present invention provides a kind of multi parameter intallingent comprehensive monitor system for hazardous gas, and this multi parameter intallingent is comprehensively supervised
The change of examining system detection light wave parameter, can calculate and obtain the extraneous parameter causing light wave parameter to change；Exist especially
Under the conditions of the very rugged environment such as inflammable and explosive, high pressure, high temperature and strong electromagnetic, there is other electricity pressure transducer institute
Incomparable advantage.
For reaching above-mentioned purpose, the technical solution used in the present invention is: a kind of multi parameter intallingent for hazardous gas is combined
Close monitoring system, including: LNG tank, modulation /demodulation instrument, it is respectively arranged in LNG tank top and bottom
The first F-P cavity pressure transducer, the second F-P cavity pressure transducer；
Described first F-P cavity pressure transducer, the second F-P cavity pressure transducer farther include diaphragm, chamber body, leaded light
Optical fiber and collimator tube, the upper surface of this chamber body has a groove, this groove is coated with described diaphragm and forms a vacuum chamber,
Described collimator tube upper surface and body bottom, chamber bonding connection, the embedding chamber, top of described light-conductive optic fibre this most internal and with chamber body
Lower surface flushes connection, and the exposed outer surface at collimator tube of end of light-conductive optic fibre is also connected end as with peripheral demodulated equipment,
Described light-conductive optic fibre is positioned at the central region of collimator tube and is carved with grating, and described diaphragm lower surface is fixed with a composite dielectric film；
The sensing that described modulation /demodulation instrument receives from the first F-P cavity pressure transducer, the second F-P cavity pressure transducer is believed
Number, and from induced signal, extract the pressure and temperature data message of point being monitored；Described composite dielectric film by silicon nitride layer,
Tantalum pentoxide stacking adds composition, described silicon nitride layer and film contact, and this tantalum pentoxide layer is towards groove.
In technique scheme, further improved plan is as follows:
1., in such scheme, described light-conductive optic fibre is connected by an anchor tip installation between bottom collimator tube.
2., in such scheme, described diaphragm shapes is square, rhombus, circle.
Owing to technique scheme is used, the present invention compared with prior art has the advantage that
The present invention is for the multi parameter intallingent comprehensive monitor system of hazardous gas, and it uses light sensor multiplexing technology by optical fiber
Pressure, temperature sensor are multiplexed into an optical fiber, improve efficiency, solve synchronous detecting and the transmission of many reference amounts, utilize light
Fine pressure, temperature sensor technology can realize gas station completely and stock up the essential safety real time measure of process, this monitoring system
Transmission signal vector is light, and field monitoring does not introduce any type of electricity, have essential explosion-resistance characteristic, volume little, highly sensitive,
The advantages such as corrosion-resistant, electromagnetism interference, can the multinomial parameter of LNG storage tank of comprehensive real-time monitoring gas station；Secondly, its (1)
Fibre Optical Sensor light weight, optical fiber is superfine, flexible, is particularly suitable for sensor mass being required, higher occasion uses；
(2) loss of fiber-optic transfer light wave is little, is not realized telemeasurement and control by any electromagnetic interference；When extraneous parameter (pressure, shape
Become and displacement etc.) act in a certain way when Fabry-Perot cavity causes change of cavity length and interfere, interference signal of its output is also sent out
Raw respective change.By detecting the change of light wave parameter, can calculate and obtain the extraneous ginseng causing light wave parameter to change
Amount；Especially under the conditions of the very rugged environment such as inflammable and explosive, high pressure, high temperature and strong electromagnetic, there is other electricity pressure
The advantage that force transducer is incomparable, therefore becomes the important realization rate of essential safety, high-acruracy survey, has well
Market application foreground.
Accompanying drawing explanation
Accompanying drawing 1 is multi parameter intallingent comprehensive monitor system structural representation of the present invention；
Accompanying drawing 2 is F-P cavity pressure sensor structure schematic diagram in multi parameter intallingent comprehensive monitor system of the present invention；
Accompanying drawing 3 is the partial structurtes schematic diagram of accompanying drawing 2；
Accompanying drawing 4 is the pressure and temperature signal spectrum of multi parameter intallingent comprehensive monitor system of the present invention.
In the figures above: 1, LNG tank；2, modulation /demodulation instrument；6, the first F-P cavity pressure transducer；7, second
F-P cavity pressure transducer；8, diaphragm；9, chamber body；91, groove；10, light-conductive optic fibre；101, grating；11, collimator tube；12, true
Cavity；13, composite dielectric film；14, anchor tip；151, silicon nitride layer；152, tantalum pentoxide layer.
Detailed description of the invention
Below in conjunction with the accompanying drawings and embodiment the invention will be further described:
Embodiment: a kind of multi parameter intallingent comprehensive monitor system for hazardous gas, including: LNG tank 1,
Modulation /demodulation instrument 2, it is respectively arranged in the first F-P cavity pressure transducer the 6, the 2nd F-P of LNG tank 1 top and bottom
Cavity pressure sensor 7；
Described first F-P cavity pressure transducer the 6, second F-P cavity pressure transducer 7 farther include diaphragm 8, chamber body 9,
Light-conductive optic fibre 10 and collimator tube 11, the upper surface of this chamber body 9 has a groove 91, and this groove 91 is coated with described diaphragm 8
And form a vacuum chamber 12, described collimator tube 11 upper surface and chamber body 9 bottom bonding connection, the top of described light-conductive optic fibre 10
In embedding chamber body 9 and flush with chamber body 9 lower surface and be connected, the exposed appearance at collimator tube 11 of end of light-conductive optic fibre 10
Face is also connected end as with peripheral demodulated equipment, and the central region that described light-conductive optic fibre 10 is positioned at collimator tube 11 is carved with grating
101, described diaphragm 8 lower surface is fixed with a composite dielectric film 13；
Described modulation /demodulation instrument 2 receives the sense from first F-P cavity pressure transducer the 6, second F-P cavity pressure transducer 7
Induction signal, and from induced signal, extract the pressure and temperature data message of point being monitored, described database server 3 record
Pressure and temperature data message from modulation /demodulation instrument 2；Described composite dielectric film 13 is by silicon nitride layer 151, tantalum pentoxide
Layer 152 superposition composition, described silicon nitride layer 151 contacts with diaphragm 8, and this tantalum pentoxide layer 152 is towards groove 91.
Above-mentioned light-conductive optic fibre 10 is connected by anchor tip 14 installation between bottom collimator tube 11.
Above-mentioned diaphragm 8 is shaped as square, rhombus, circle.
(1) field optical fibers sensing layer.Fibre Optical Sensor layer is the bottom of LNG storage tank essential safety monitoring system, is whole prison
The information source of examining system, by being embedded in the fibre optic compression sensor of LNG storage tank relevant position, fibre optic temperature sensor forms.
The essential informations such as the pressure and temperature of Fibre Optical Sensor real-time detection LNG storage tank, and it is real-time transmitted to long-range LNG by optical fiber
Gas station Control Room.
(2) LNG gas station safety monitoring network network layers.It is positioned at the LNG gas station Safety monitoring system of LNG gas station Control Room
Layer is main by equipment groups such as special Fibre Optical Sensor modulation /demodulation instrument, WEB server, application server and database servers
Become, in whole LNG gas station safety monitoring system, serve as nerve centre and brain.It can transmit and process from on-the-spot LNG
The LNG storage tank safety monitoring information that storage tank Fibre Optical Sensor layer obtains.The function of LNG gas station monitoring station mainly has: 1. monitor
LNG storage tank secure data real time information shows；2. the alert parameter of the safety forecast of field optical fibers sensing layer is arranged；3. LNG storage tank peace
Full monitoring information is real-time, chart；4. user's management；5. query statistic.
(3) LNG gas station safety monitoring application layer.LNG gas station safety monitoring application layer mainly provides LNG storage tank safety
Monitoring operation, and the interface mutual with other subsystem, provide different application according to different users.
2.1.1LNG entry log metering
By being installed on bottom LNG storage tank and the high accuracy F-P fibre optic compression sensor at top, it is possible to real-time detection LNG
Tank bottom liquid pressure P1And top amounts of pressurized gaseous P2, utilize hydrostatic principle P=ρ gH, the liquid level of LNG storage tank can be obtained
For:
In formula, ρLNGFor LNG density, g is local acceleration.
Therefore, when the density p of given LNGLNG, formula (1) liquid level that LNG storage tank is current can be obtained, and then realize LNG
The safety monitoring of tank level.Meanwhile, according to liquid level and LNG storage tank strapping table or pressure and the relation of LNG storage tank strapping table, can
To obtain the volume of current LNG storage tank, by formula (2), LNG storage tank entry log (Δ m) can be obtainedInFor:
(Δm)In=Δ V × ρLNG (2)
LNG gas station stock up metering or filling metering is required to the measurement of LNG density.Therefore, can be suitable in LNG storage tank
Position install F-P fibre optic compression sensor additional, constitute an online Density Measuring Instrument of optical fiber, the pressure P of real-time detection LNG storage tank3, as
Position shown in Fig. 1.The online Density Measuring Instrument of optical fiber can also be placed in pump pond.
Utilizing static pressure method principle, the online Density Measuring Instrument of optical fiber can the most indirectly calculate the density of LNG and be:
In formula, Δ H is that two high accuracy F-P fibre optic compression sensor setting height(from bottom)s are poor.
2.1.3 temperature survey
Utilize optical fiber pressure temperature multiplexing patented technology, it is possible to achieve an optical fiber the most remote real-time Transmission LNG storage
The pressure and temperature signal of tank.It is installed on bottom LNG storage tank or the fibre optic compression sensor at top, can store up with real-time perception LNG
The pressure P of pot bottom/top LNG1And P2, it is installed on bottom LNG storage tank or the fibre optic temperature sensor at top, can feel in real time
Know temperature T of LNG storage tank bottom/top LNG1And T2, for pressure, the real-time detection of temperature parameters, it is fully available for LNG storage
The real-time correction of tank current volume, improves the accuracy of LNG metering, is adding that the detection to LNG density just constitutes complete set
LNG storage tank intellectual faculties.
2.1.4 fire safety evaluating pre-alarm is monitored
By the fibre optic temperature sensor being installed on around LNG storage tank, (1 optical fiber can transmit 5 optical fiber sensings simultaneously
Signal) variation of ambient temperature around perception LNG storage tank, according to the fire forecast alarming information pre-set, monitoring LNG adds in real time
Gas station safety information.
2.2 system features
(1) the many reference amounts monitoring of essential safety.All-fiber LNG gas station safety monitoring system uses the optical fiber of advanced technology
Sensor, it is possible to achieve the many reference amounts such as the pressure of LNG storage tank, temperature and density are monitored in real time, and signal transmission medium is optical fiber,
LNG storage tank field monitoring does not introduce any electricity.
(2) real-time is good.The many reference amounts of LNG storage tank by corresponding Fibre Optical Sensor real-time detection and are modulated by Fibre Optical Sensor
(FBG) demodulator Real-time demodulation exports, and by the corresponding metering tasks of computer complete independently, can efficiently avoid manual intervention and exist
All drawbacks.
(3) precision is high.It is installed on high-precision optical fiber pressure transducer performance indications such as table 1 institute of LNG storage tank bottom/top
Show:
Table 1 fibre optic compression sensor performance indications
| Sequence number | Model/index | Fibre optic compression sensor |
| 1 | Measurement scope | 0～10MPa pressure limit is customizable |
| 2 | Degree of accuracy | ± 0.1～0.3%/F.S |
| 3 | Resolution | ±20Pa |
| 4 | Test philosophy | Pressure (static pressure method HTG) quality |
| 5 | Applicable situation | Any container |
| 6 | Measure medium | Flowable media/gas |
| 7 | Measure medium temperature range | -20 DEG C～65 DEG C of temperature ranges customizable |
| 8 | Working sensor ambient temperature | -20 DEG C～55 DEG C |
| 9 | Relative humidity | ≤ 90% |
| 10 | Transmission range | 2km (basic setup) user customizable |
| 11 | Installation and debugging | Mounting means is easy, |
| 12 | Volume | Little |
| 13 | Explosive-proof grade | Ex (essential safety) |
(4) advanced technology.
1. on the basis of existing fiber pressure transducer, light wave multiplex technique is utilized, it is achieved that an optical fiber passes simultaneously
Losing fine pressure and temperature signal, after multiplexing, the spectral signal of optical fiber pressure and temperature is as shown in Figure 4.
In office when the most whole monitoring system, based on Internet of Things framework, utilizes Jboss development platform, fully achieve user
Between any place by the on-the-spot running status of internet access LNG gas station safety monitoring.
(5) low cost.
1. optical fiber pressure temperature multiplexing patented technology is utilized, it is possible to achieve the most remote real-time Transmission optical fiber of optical fiber
Pressure and temperature signal.
2. fiber optic temperature demodulation techniques are utilized, it is possible to achieve the most remote most 5 monitorings of real-time Transmission of optical fiber
Point temperature signal.
3. for meet petrochemical industry Application in Sensing multimetering and the actual demand of miniaturization, our team is to pressure, temperature
Degree sensor-based system multiplexing technique launches research.Utilize photoswitch switching and wideband light source to modulate, devise 16 road optical fiber and pass
The array type multichannel sensing modulation demodulation system of sensor, rate of scanning is 5kHz, and change of cavity length certainty of measurement is up to 10pm, real
Show multi-channel optical fibre pressure-temperature sensor and shared a set of modulation /demodulation instrument and signal processing system, be effectively increased modulation /demodulation
The efficiency of instrument.
The online passive densimeter of LNG, the most domestic is a blank.By effort for many years, the optical fiber that my company develops
Pressure transducer can realize technique completely, breaks through the forbidden zone of the safety monitoring technology of liquefied petroleum gas storage.
Using above-mentioned novel when the multi parameter intallingent comprehensive monitor system of hazardous gas, it uses light sensor multiplexing skill
Optical fiber pressure, temperature sensor are multiplexed into an optical fiber by art, improve efficiency, solve synchronous detecting and the biography of many reference amounts
Defeated, utilize optical fiber pressure, temperature sensor technology can realize gas station completely and stock up the essential safety real time measure of process, this prison
The transmission signal vector of examining system is light, and field monitoring does not introduce any type of electricity, have essential explosion-resistance characteristic, volume little,
The advantages such as highly sensitive, corrosion-resistant, electromagnetism interference, can the multinomial parameter of LNG storage tank of comprehensive real-time monitoring gas station；Its
Secondary, its (1) Fibre Optical Sensor light weight, optical fiber is superfine, flexible, is particularly suitable for sensor mass is being required higher field
Close and use；(2) loss of fiber-optic transfer light wave is little, is not realized telemeasurement and control by any electromagnetic interference；When extraneous parameter
(pressure, deformation and displacement etc.) act in a certain way when Fabry-Perot cavity causes change of cavity length and interfere, the interference of its output
Also there is respective change in signal.By detecting the change of light wave parameter, acquisition can be calculated and cause light wave parameter to change
Extraneous parameter；Especially under the conditions of the very rugged environment such as inflammable and explosive, high pressure, high temperature and strong electromagnetic, there is it
The advantage that its electricity pressure transducer is incomparable, therefore becomes the important realization rate of essential safety, high-acruracy survey, tool
There is good market application foreground.
It should be pointed out that, that the above detailed description of the invention can make those skilled in the art that the present invention is more fully understood
Create, but limit the invention never in any form.Therefore, although the present invention is created by this specification referring to the drawings with embodiment
Make and have been carried out detailed description, it will be understood by those skilled in the art, however, that still the invention can be modified
Or equivalent, in a word, all are without departing from the technical scheme of the spirit and scope of the invention and improvement thereof, and it all should be contained
Cover in the middle of the protection domain of the invention patent.
Claims (3)
1. the multi parameter intallingent comprehensive monitor system for hazardous gas, it is characterised in that: including: LNG tank
(1), modulation /demodulation instrument (2), be respectively arranged in the first F-P cavity pressure transducer of LNG tank (1) top and bottom
(6), the second F-P cavity pressure transducer (7)；
Described first F-P cavity pressure transducer (6), the second F-P cavity pressure transducer (7) farther include diaphragm (8), chamber body
(9), light-conductive optic fibre (10) and collimator tube (11), the upper surface of this chamber body (9) has a groove (91), this groove (91) overlying
Being stamped described diaphragm (8) and form a vacuum chamber (12), described collimator tube (11) upper surface is with chamber body (9) bottom bonding even
Connect, in the embedding chamber, top body (9) of described light-conductive optic fibre (10) and flush with chamber body (9) lower surface and be connected, light-conductive optic fibre
(10) the exposed outer surface at collimator tube (11) of end is also connected end, described light-conductive optic fibre (10) as with peripheral demodulated equipment
The central region being positioned at collimator tube (11) is carved with grating (101), and described diaphragm (8) lower surface is fixed with a composite dielectric film
(13)；
Described modulation /demodulation instrument (2) receives from the first F-P cavity pressure transducer (6), the second F-P cavity pressure transducer (7)
Induced signal, and from induced signal, extract the pressure and temperature data message of point being monitored；Described composite dielectric film (13)
Being made up of silicon nitride layer (151), tantalum pentoxide layer (152) superposition, described silicon nitride layer (151) contacts with diaphragm (8), and these are five years old
Aoxidize two tantalum layers (152) towards groove (91).
LNG gas station the most according to claim 1 metering device, it is characterised in that: described diaphragm (8) is shaped as pros
Shape, rhombus, circle.
LNG gas station the most according to claim 1 metering device, it is characterised in that: described light-conductive optic fibre (10) and collimation
Installed by an anchor tip (14) between pipe (11) bottom and connect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610567226.9A CN106289599A (en) | 2016-07-19 | 2016-07-19 | Multi parameter intallingent comprehensive monitor system for hazardous gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610567226.9A CN106289599A (en) | 2016-07-19 | 2016-07-19 | Multi parameter intallingent comprehensive monitor system for hazardous gas |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106289599A true CN106289599A (en) | 2017-01-04 |
Family
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| CN201610567226.9A Pending CN106289599A (en) | 2016-07-19 | 2016-07-19 | Multi parameter intallingent comprehensive monitor system for hazardous gas |
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