CN107101697B - A kind of device of quasi-distributed optical fiber liquid level sensor and its method for measuring liquid level - Google Patents
A kind of device of quasi-distributed optical fiber liquid level sensor and its method for measuring liquid level Download PDFInfo
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- CN107101697B CN107101697B CN201710301826.5A CN201710301826A CN107101697B CN 107101697 B CN107101697 B CN 107101697B CN 201710301826 A CN201710301826 A CN 201710301826A CN 107101697 B CN107101697 B CN 107101697B
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- 239000007788 liquid Substances 0.000 title claims abstract description 39
- 239000013307 optical fiber Substances 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims description 4
- 239000000835 fiber Substances 0.000 claims abstract description 31
- 230000008447 perception Effects 0.000 claims abstract description 29
- 238000012360 testing method Methods 0.000 claims abstract description 16
- 230000000694 effects Effects 0.000 claims abstract description 5
- 230000003287 optical effect Effects 0.000 claims description 15
- 230000003321 amplification Effects 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 4
- 238000005259 measurement Methods 0.000 claims description 2
- 238000012544 monitoring process Methods 0.000 abstract description 5
- 230000001939 inductive effect Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 5
- 235000013290 Sagittaria latifolia Nutrition 0.000 description 1
- 235000015246 common arrowhead Nutrition 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003205 fragrance Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000005622 photoelectricity Effects 0.000 description 1
- 230000011514 reflex Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000009923 sugaring Methods 0.000 description 1
Classifications
-
- 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
Abstract
The present invention relates to a kind of liquid level sensors, can specifically measure the sensor with the multiple and different position liquid levels of monitoring simultaneously at a distance.A kind of device of quasi-distributed optical fiber liquid level sensor, the device include wideband light source, wavelength division multiplexer, fiber amplifier, coupler, circulator, one or more perception item, two photodetectors, data acquisition module, related operation module, display module.The present invention actively introduces and makes full use of profile of optic fibre Fresnel reflection effect, and telemetering while realizing multiple and different position liquid levels of tens of km number ranges in conjunction with cross-correlation test technology has Inductive links passive, essential safety, electromagnetism interference；Structure is simple, is laid with flexible；Using wideband light source, measuring accuracy reaches millimeter order；Can multiple positions carry out level gauge simultaneously；The advantages of capable of carrying out level gauge at a distance.
Description
Technical field
The present invention relates to a kind of liquid level sensors, specifically can be measured simultaneously at a distance and monitor multiple and different position liquid
The sensor of position.
Background technique
In occasions such as petrochemical industry, sugaring, pharmacy, environmental monitorings, often there are metering or monitoring requirements to liquid level, so
And existing metering is mostly to be easy to make personal safety in this way in short distance or field sampling metering liquid liquid level with monitoring technology
At threat, influence production process, and heavy workload, how to provide one kind can at a distance and meanwhile metering with monitoring it is multiple and different
Position liquid level, and with being laid with, flexible, structure is simple, multiple spot measures simultaneously, the liquid level sensor that long-distance large-range measures
Aobvious is very necessary.
Summary of the invention
The technical problems to be solved by the present invention are: how to provide a kind of remote multiple positions for being suitable for risk occasion
The liquid level sensor set while measured.
The technical scheme adopted by the invention is that: a kind of device of quasi-distributed optical fiber liquid level sensor, the device include
Wideband light source, wavelength division multiplexer, fiber amplifier, coupler, circulator, one or more perception item, two photodetections
Device, data acquisition module, related operation module, display module, wideband light source connect wavelength division multiplexer, wavelength-division multiplex by optical fiber
Device connects fiber amplifier, fiber amplifier by optical fiber and connects coupler by optical fiber, and coupler passes through optical fiber connection first
Photodetector, coupler connect circulator by optical fiber, and the first photodetector passes through optical-fiber connection data acquisition module, number
Related operation module is connected according to acquisition module electric signal, related operation modular telecommunications number connect display module, and circulator passes through light
Fibre the second photodetector of connection, the second photodetector are connected by optical-fiber connection data acquisition module, circulator by optical fiber
The multiple perception items for connecing one or being linked in sequence.
As a kind of preferred embodiment: then each perception item passes through grid by the fiber segment arranged at equal intervals of multiple equal lengths
Cascade is fixed to be constituted, and point-blank, grid cascade fixation refers to that reticulating structure fixes, and makes to the center line of all fiber segments
Exterior materials can enter in the gap between the interval of fiber segment, and exterior materials described here refer to testing liquid and sky
Gas.
As a kind of preferred embodiment: the optical signal that wideband light source issues enters in fiber amplifier after wavelength division multiplexer
Amplification, then the optical signal of amplification is divided by coupler by two parts；A part of optical signal enters quilt after the first photodetector
It is transformed into the first electric signal, the first electric signal is transformed into the first digital signal, the first number letter after data collecting module collected
Number it is transferred to related operation module；Another part optical signal enters in perception item after passing through circulator, in perception item, due to
Fiber segment gap occur Fresnel emit effect, the optical signal containing metrical information along the opposite direction of propagation by circulator into
Enter the second photodetector and be transformed into the second electric signal, the second electric signal is transformed into the second number after data collecting module collected
Signal, the second digital signal are transferred to related operation module, and the first digital signal and the second digital signal are in related operation mould
Block does computing cross-correlation, and correlation result is shown by display module, and correlation result is each gap point on perception item
The figure of each relevant peaks is not corresponded, is compared perception item and is in air and perceives the figure acquisition that item is in testing liquid
The number of interspace is perceived in testing liquid, that is, the unit obtained in liquid is perceived a number of division k, waited for using formula
Survey liquid depth is lk=k*(d+g), wherein d is optical fiber span length, and g is gap width.
The medicine have the advantages that the present invention actively introduces and makes full use of profile of optic fibre Fresnel reflection effect, in conjunction with
Telemetering while cross-correlation test technology realizes multiple and different position liquid levels of tens of km number ranges, have Inductive links without
Source, essential safety, electromagnetism interference；Structure is simple, is laid with flexible；Using wideband light source, measuring accuracy reaches millimeter order；It can
Multiple positions carry out level gauge simultaneously；The advantages of capable of carrying out level gauge at a distance.
Detailed description of the invention
Fig. 1 is schematic structural diagram of the device of the invention；
Fig. 2 is the correlation result schematic diagram for perceiving item and being placed in air；
Fig. 3 is the correlation result schematic diagram that part perception item is in testing liquid；
Fig. 4 is perception structure design diagram；
Fig. 5 is that Fig. 4 is location A enlarged diagram；
Wherein, 1, wideband light source, 2, wavelength division multiplexer, 3, fiber amplifier, 4, coupler, 5, circulator, 6, perception item,
71, the first photodetector, the 72, second photodetector, 8, data acquisition module, 9, related operation module, 10, display mould
Block, 11, optical fiber, 12, interval (gap), 13, covering, 14, fibre core.
Specific embodiment
As shown in Figure 1, a kind of device of quasi-distributed optical fiber liquid level sensor, which includes that wideband light source, wavelength-division are multiple
With device, fiber amplifier, coupler, circulator, one or more perception item, two photodetectors, data acquisition module,
Related operation module, display module, wideband light source connect wavelength division multiplexer by optical fiber, and wavelength division multiplexer connects light by optical fiber
Fiber amplifier, fiber amplifier connect coupler by optical fiber, and coupler connects the first photodetector, coupler by optical fiber
Circulator is connected by optical fiber, the first photodetector passes through optical-fiber connection data acquisition module, data acquisition module electric signal
Related operation module is connected, related operation modular telecommunications number connect display module, and circulator connects the second photoelectricity by optical fiber and visits
Device is surveyed, the second photodetector connects one by optical fiber by optical-fiber connection data acquisition module, circulator or sequentially connects
The multiple perception items connect.Then each perception item cascades fixed structure by grid by the fiber segment arranged at equal intervals of multiple equal lengths
At point-blank, grid cascade fixation refers to that reticulating structure fixes, and makes exterior materials can to the center line of all fiber segments
In the gap between interval to enter fiber segment.The optical signal that wideband light source issues is put after wavelength division multiplexer into optical fiber
Amplify in big device, then the optical signal of amplification is divided by coupler by two parts；A part of optical signal enters the first photodetection
It is transformed into the first electric signal after device, the first electric signal is transformed into the first digital signal after data collecting module collected, and first
Digital signal is transferred to related operation module；Another part optical signal enters in perception item after passing through circulator, in perception item
In, since the Fresnel that fiber segment gap occurs emits effect, the optical signal containing metrical information passes through along the opposite direction of propagation
Circulator enters the second photodetector and is transformed into the second electric signal, and the second electric signal is transformed into after data collecting module collected
Second digital signal, the second digital signal are transferred to related operation module, and the first digital signal and the second digital signal are in phase
It closing computing module and does computing cross-correlation, correlation result is shown by display module, as shown in Figures 2 and 3, related operation knot
Fruit is the figure (arrow) for perceiving each gap on item and corresponding each relevant peaks respectively, compares perception item and is in air (long
Arrow explanation is in air) being in the figure in testing liquid with perception item, (short arrow is corresponding in testing liquid, long arrow
Head is corresponding in air) obtain the number k that interspace is perceived in testing liquid, that is, obtain the list in testing liquid
Position perception scale value lk, utilize formula testing liquid depth lk=k*(d+g), wherein d is optical fiber span length, and g is gap width.
As shown in Figure 4 and Figure 5, place (all fiber segments at equal intervals along center line with a series of fiber segment of equal lengths
Center line is point-blank), and fixed composition is cascaded by external grid, many gaps are formed for generating a series of luxuriant and rich with fragrance alunites
Ear reflex, the corresponding Fresnel reflection in a gap.Such as: fiber segment equal length is d0=d1=d2=...=dm-1=d=1.5mm
And gap equal in width is g0=g1=g2=...=gm-1=g=0.5mm, thus perceiving the scales such as item is L=d+g=2.0mm, m is perception item
Scale total number, m=100, so, the scales such as perception item are 2mm, range 20cm.If measurement obtains short quarter in testing liquid
The quantity of degree is k=25, then the depth of testing liquid is lk=25*2=50mm。
Claims (2)
1. a kind of quasi-distributed optical fiber liquid level sensor device, it is characterised in that: the device includes wideband light source, wavelength-division multiplex
Device, fiber amplifier, coupler, circulator, one or more perception item, two photodetectors, data acquisition module, phases
Computing module, display module are closed, wideband light source connects wavelength division multiplexer by optical fiber, and wavelength division multiplexer connects optical fiber by optical fiber
Amplifier, fiber amplifier connect coupler by optical fiber, and coupler connects the first photodetector by optical fiber, and coupler is logical
Optical fiber connection circulator is crossed, the first photodetector is connected by optical-fiber connection data acquisition module, data acquisition module electric signal
Related operation module is connect, related operation modular telecommunications number connect display module, and circulator connects the second photodetection by optical fiber
Device, the second photodetector connect one by optical fiber by optical-fiber connection data acquisition module, circulator or are linked in sequence
Multiple perception items, then each perception item passes through grid by the fiber segment arranged at equal intervals of multiple equal lengths and cascades fixed structure
At point-blank, grid cascade fixation refers to that reticulating structure fixes, and makes exterior materials can to the center line of all fiber segments
In the gap between interval to enter fiber segment.
2. a kind of method using quasi-distributed optical fiber liquid level sensor device measurement liquid level described in claim 1, feature
Be: the optical signal that wideband light source issues enters in fiber amplifier after wavelength division multiplexer to be amplified, then passes through coupler handle
The optical signal of amplification is divided into two parts；A part of optical signal is transformed into the first electric signal after entering the first photodetector, the
One electric signal is transformed into the first digital signal after data collecting module collected, the first digital signal is transferred to related operation mould
Block；Another part optical signal enters in perception item after passing through circulator, in perception item, due to the Fei Nie of fiber segment gap generation
Ear effect, the optical signal containing metrical information enter the second photodetector by circulator along the opposite direction of propagation and are transformed into the
Two electric signals, the second electric signal are transformed into the second digital signal after data collecting module collected, the second digital signal is transmitted
To related operation module, the first digital signal and the second digital signal do computing cross-correlation, related operation in related operation module
As a result it is shown by display module, correlation result is the figure for perceiving each gap on item and corresponding each relevant peaks respectively
Shape, comparison perception item is in air and perception item is in the figure in testing liquid and obtains in testing liquid between perception item
The number of gap, that is, the unit obtained in liquid perceive a number of division k, are l using formula testing liquid depthk=k*(d+
G), wherein d is optical fiber span length, and g is gap width.
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| CN108759982B (en) * | 2018-05-21 | 2020-05-22 | 太原理工大学 | Precision-adjustable optical fiber liquid level measuring device and method based on optical chaos |
| CN110243439B (en) * | 2019-07-09 | 2021-07-20 | 南京工程学院 | Urban underground drainage pipeline distributed water level monitoring system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103196520A (en) * | 2012-01-06 | 2013-07-10 | 中国计量学院 | Transmission-type optical fiber liquid level sensor with irregular core structure |
| CN106482805A (en) * | 2016-09-28 | 2017-03-08 | 深圳华中科技大学研究院 | A kind of can real time fail monitoring multi-channel optical fibre liquid level measuring system and fault monitoring method |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103196520A (en) * | 2012-01-06 | 2013-07-10 | 中国计量学院 | Transmission-type optical fiber liquid level sensor with irregular core structure |
| CN106482805A (en) * | 2016-09-28 | 2017-03-08 | 深圳华中科技大学研究院 | A kind of can real time fail monitoring multi-channel optical fibre liquid level measuring system and fault monitoring method |
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