CN107101697A - 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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- CN107101697A CN107101697A CN201710301826.5A CN201710301826A CN107101697A CN 107101697 A CN107101697 A CN 107101697A CN 201710301826 A CN201710301826 A CN 201710301826A CN 107101697 A CN107101697 A CN 107101697A
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- 239000007788 liquid Substances 0.000 title claims abstract description 40
- 239000013307 optical fiber Substances 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims description 3
- 239000000835 fiber Substances 0.000 claims abstract description 31
- 238000012360 testing method Methods 0.000 claims abstract description 16
- 230000008447 perception Effects 0.000 claims abstract description 12
- 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
- 238000012544 monitoring process Methods 0.000 abstract description 6
- 238000005259 measurement Methods 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 abstract description 4
- 238000010276 construction Methods 0.000 abstract description 3
- 230000001939 inductive effect Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- 235000013290 Sagittaria latifolia Nutrition 0.000 description 1
- 235000015246 common arrowhead Nutrition 0.000 description 1
- 238000013461 design Methods 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
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
It is specifically that can measure the sensor with monitoring multiple diverse location liquid levels simultaneously at a distance the present invention relates to a kind of liquid level sensor.A kind of device of quasi-distributed optical fiber liquid level sensor, the device includes wideband light source, wavelength division multiplexer, fiber amplifier, coupler, circulator, one or more perception bar, two photodetectors, data acquisition module, related operation module, display modules.It is of the invention actively to introduce and make full use of profile of optic fibre Fresnel reflection effect, remote measurement while realizing multiple diverse location liquid levels of tens of km number scopes with reference to cross-correlation test technology, essential safety passive with Inductive links, electromagnetism interference；Simple in construction, laying is flexible；Using wideband light source, measuring accuracy reaches the millimeter order of magnitude；Can multiple positions simultaneously carry out level gauge；The advantage of level gauge can be carried out at a distance.
Description
Technical field
It is specifically to measure simultaneously with monitoring multiple diverse location liquid at a distance the present invention relates to a kind of liquid level sensor
The sensor of position.
Background technology
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 generally, closely or field sampling metering liquid liquid level, so easily personal safety to be made with monitoring technology
Into threat, production process is influenceed, and workload is big, and how to provide one kind can be at a distance while metering be with monitoring multiple differences
Position liquid level, and with the liquid level sensor for laying the metering simultaneously of flexible, simple in construction, multiple spot, long-distance large-range measurement
Aobvious is very necessary.
The content of the invention
The technical problems to be solved by the invention are：How a kind of remote multiple positions for being suitable for dangerous occasion are provided
Put while the liquid level sensor of measurement.
The technical solution adopted in the present invention is：A kind of device of quasi-distributed optical fiber liquid level sensor, the device includes
Wideband light source, wavelength division multiplexer, fiber amplifier, coupler, circulator, one or more perception bar, 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 connection coupler by optical fiber, and coupler passes through optical fiber and connects first
Photodetector, coupler connects 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 connection display module, circulator passes through light
Fibre the second photodetector of connection, the second photodetector is connected by optical-fiber connection data acquisition module, circulator by optical fiber
The multiple perception bars for connecing one or being linked in sequence.
It is used as a kind of preferred embodiment：Each bar that perceives is arranged and then by grid at equal intervals by the fiber segment 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.
It is used as a kind of preferred embodiment：The optical signal that wideband light source is sent enters in fiber amplifier after wavelength division multiplexer
Amplification, then the optical signal of amplification is divided into 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 data signal, the first numeral letter after data collecting module collected
Number it is transferred to related operation module；Another part optical signal is perceived in bar by entering after circulator, in bar is perceived, due to
The Fresnel transmitting effect that fiber segment gap occurs, the optical signal containing metrical information enters along the opposite direction of propagation by circulator
Enter the second photodetector and be transformed into the second electric signal, the second electric signal is transformed into the second numeral after data collecting module collected
Signal, the second data signal is transferred to related operation module, and the first data signal and the second data signal are in related operation mould
Block does computing cross-correlation, and correlation result is shown by display module, and correlation result divides to perceive each gap on bar
The figure of each relevant peaks is not corresponded, is compared perception bar and is in air and perceives the figure acquisition that bar is in testing liquid
The number of interspace is perceived in testing liquid, that is, obtains the unit being in liquid and perceives bar number of division k, treated using formula
Survey liquid depth is lk=k*（d+g）, wherein d is optical fiber span length, and g is gap width.
Present invention has the advantages that：It is of the invention actively to introduce and make full use of profile of optic fibre Fresnel reflection effect, with reference to
Remote measurement while cross-correlation test technology realizes multiple diverse location liquid levels of tens of km number scopes, with Inductive links without
Source, essential safety, electromagnetism interference；Simple in construction, laying is flexible；Using wideband light source, measuring accuracy reaches the millimeter order of magnitude；Can
Multiple positions carry out level gauge simultaneously；The advantage of level gauge can be carried out at a distance.
Brief description of the drawings
Fig. 1 is apparatus of the present invention structural representation；
Fig. 2 is to perceive the correlation result schematic diagram that bar is placed in air；
Fig. 3 is that part perceives the correlation result schematic diagram that bar is in testing liquid；
Fig. 4 is to perceive bar structure design schematic 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, perceive bar, 71,
First photodetector, the 72, second photodetector, 8, data acquisition module, 9, related operation module, 10, display module,
11st, optical fiber, 12, interval（Gap）, 13, covering, 14, fibre core.
Embodiment
As shown in figure 1, a kind of device of quasi-distributed optical fiber liquid level sensor, the device is multiple including wideband light source, wavelength-division
With device, fiber amplifier, coupler, circulator, one or more perceive bar, 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 connection display module, circulator connects the second photoelectricity by optical fiber and visited
Device is surveyed, the second photodetector is by optical-fiber connection data acquisition module, circulator connects one by optical fiber or order connects
The multiple perception bars connect.Each bar that perceives is arranged and then cascades fixed structure by grid at equal intervals by the fiber segment of multiple equal lengths
Into 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 is sent is put after wavelength division multiplexer into optical fiber
Amplify in big device, then the optical signal of amplification is divided into by coupler by two parts；A part of optical signal enters the first photodetection
The first electric signal is transformed into after device, the first electric signal is transformed into the first data signal, first after data collecting module collected
Data signal is transferred to related operation module；Another part optical signal is perceived in bar by entering after circulator, is perceiving bar
In, because the Fresnel that fiber segment gap occurs launches effect, the optical signal containing metrical information passes through along the opposite direction of propagation
Circulator is transformed into the second electric signal into the second photodetector, and the second electric signal is transformed into after data collecting module collected
Second data signal, the second data signal is transferred to related operation module, and the first data signal and the second data signal are in phase
Close computing module and do computing cross-correlation, correlation result is shown by display module, as shown in Figures 2 and 3, related operation knot
Fruit corresponds the figure of each relevant peaks for each gap on perception bar respectively（Arrow）, compare and perceive bar in air（It is long
Arrow explanation is in air）The figure in testing liquid is in perception bar（Short arrow correspondence is in testing liquid, long arrow
Head correspondence is in air）The number k for being in and interspace being perceived in testing liquid is obtained, that is, obtains the list being in testing liquid
Position perceives bar 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, placed at equal intervals along center line with a series of fiber segment of equal lengths（All fiber segments
Center line is point-blank）, and constituted by the way that the cascade of outside grid is fixed, forming many gaps is used to produce a series of luxuriant and rich with fragrance alunites
Ear reflex, gap one Fresnel reflection of correspondence.For example：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 it is L=d+g=2.0mm to perceive the scales such as bar, m is perception bar
Scale total number, m=100, so, it is 2mm to perceive the scales such as bar, and range is 20cm.If measurement obtains short in testing liquid carve
The quantity of degree is k=25, then the depth of testing liquid is lk=25*2=50mm。
Claims (3)
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 bar, 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 leads to
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 connection display module, circulator connects the second photodetection by optical fiber
Device, the second photodetector connects one by optical fiber by optical-fiber connection data acquisition module, circulator or is linked in sequence
Multiple perception bars.
2. a kind of quasi-distributed optical fiber liquid level sensor device according to claim 1, it is characterised in that：It is each to perceive bar
Arranged by the fiber segment of multiple equal lengths and then be made up of grid cascade fixation at equal intervals, the center line of all fiber segments is one
On bar straight line, grid cascade fixation refers to that reticulating structure fixes, and exterior materials is entered between the interval of fiber segment
In gap.
3. the method that the quasi-distributed optical fiber liquid level sensor device described in a kind of utilization claim 2 measures liquid level, its feature
It is：The optical signal that wideband light source is sent 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 data signal after data collecting module collected, the first data signal is transferred to related operation mould
Block；Another part optical signal is perceived in bar by entering after circulator, in bar is perceived, the Fei Nie occurred due to fiber segment gap
Ear launches effect, and the optical signal containing metrical information changes along the opposite direction of propagation by circulator into the second photodetector
Into the second electric signal, the second electric signal is transformed into the second data signal, the second data signal quilt after data collecting module collected
Related operation module is transferred to, the first data signal and the second data signal do computing cross-correlation in related operation module, it is related
Operation result shows that correlation result corresponds each relevant peaks respectively to perceive each gap on bar by display module
Figure, comparison perception bar is in air and figure acquisition of the perception bar in testing liquid is in testing liquid and perceives bar
The number in gap, that is, obtain the unit being in liquid and perceive bar number of division k, be 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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| Application Number | Priority Date | Filing Date | Title |
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| CN201710301826.5A CN107101697B (en) | 2017-05-02 | 2017-05-02 | A kind of device of quasi-distributed optical fiber liquid level sensor and its method for measuring liquid level |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710301826.5A CN107101697B (en) | 2017-05-02 | 2017-05-02 | A kind of device of quasi-distributed optical fiber liquid level sensor and its method for measuring liquid level |
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| CN107101697A true CN107101697A (en) | 2017-08-29 |
| CN107101697B CN107101697B (en) | 2019-05-28 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108759982A (en) * | 2018-05-21 | 2018-11-06 | 太原理工大学 | A kind of adjustable optical fiber liquid level measuring device of precision based on optical chaos and method |
| CN110243439A (en) * | 2019-07-09 | 2019-09-17 | 南京工程学院 | A kind of urban underground water drainage pipe road 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 |
-
2017
- 2017-05-02 CN CN201710301826.5A patent/CN107101697B/en active Active
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 |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108759982A (en) * | 2018-05-21 | 2018-11-06 | 太原理工大学 | A kind of adjustable optical fiber liquid level measuring device of precision based on optical chaos and method |
| 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 |
| CN110243439A (en) * | 2019-07-09 | 2019-09-17 | 南京工程学院 | A kind of urban underground water drainage pipe road distributed water level monitoring system |
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