CN103884401B - The detection means of optical fiber oil water surface and detection method - Google Patents
The detection means of optical fiber oil water surface and detection method Download PDFInfo
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- CN103884401B CN103884401B CN201410125876.9A CN201410125876A CN103884401B CN 103884401 B CN103884401 B CN 103884401B CN 201410125876 A CN201410125876 A CN 201410125876A CN 103884401 B CN103884401 B CN 103884401B
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Abstract
The detection means of optical fiber oil water surface, including narrow-linewidth laser light source, circulator, becomes end tail optical fiber, length scales, photodetector and signal processing and display module；Narrow-linewidth laser light source is passed through circulator and is connected with one-tenth end tail optical fiber, becomes the free end of end tail optical fiber to be arranged side by side with length scales, the 3rd port of circulator is connected with display module with signal processing through photodetector.Detection method using aforementioned detection devices：1）Before measurement, using the free end tail end planar survey becoming to hold optical fiber and the aerial power measurement values of recording equipment；2）By the one-tenth being arranged side by side end optical fiber together with length scales, immerse in oil mixing with water liquid to be measured perpendicular to liquid level, during power value changes, record reflection power and length scales reading；3）End optical fiber and length scales will be become to immerse further, when performance number changes again, record reflection power and length scales reading；4）Calculation procedure 2）、3）The difference of middle length scales reading is core intersection.
Description
Technical field
The present invention relates to the interfacial detection of mixing liquid, in particular to a kind of detection means of optical fiber oil water surface and
Detection method.
Background technology
Oil-water separation is widely used in petrochemical industry, ship and environmental protection industry (epi) etc., and the more mode of application is to utilize at present
The layering of profit density contrast carries out oil-water separation, and during being somebody's turn to do, the Accurate Determining of oil water surface is that difficult point is located.Existing profit divides
What interface determination techniques were commonly used has the methods such as condenser type, electric pole type, float-ball type, ultrasonic listening and oil content detection, these methods
All there are some defects, for example during enforcement：There is the scene of requirement of explosion proof at some, the electric capacity of energising detection, electric pole type method are not
Meet requirement of explosion proof；Ultrasonic listening and oil content detection method are affected by variation of ambient temperature, and testing result deviation is larger, and
The instrument that such detection method uses is complicated, puts into and use cost is higher；Float-ball type detection method is due to ball float longitudinal size
Larger it is more difficult to be accurately positioned oil water surface particular location, especially when oil water surface be located at container bottom low level when, or even
Cannot implement to measure.
Content of the invention
The technical problem to be solved is exactly to provide a kind of detection means of optical fiber oil water surface and detection side
Method, this apparatus structure is simple, easy to use, puts into and use cost is low；The enforcement of whole device and method disclosure satisfy that explosion-proof
Require, the impact to testing result of ambient temperature and interface location is little.
For solving above-mentioned technical problem, a kind of detection means of optical fiber oil water surface that the present invention provides, including narrow line
Wide LASER Light Source, circulator, one-tenth end tail optical fiber, length scales, photodetector and signal processing and display module；Described narrow linewidth
LASER Light Source is passed through circulator and is connected with one-tenth end tail optical fiber, becomes the free end of end tail optical fiber to be arranged side by side with described length scales, described
3rd port of circulator is connected with display module with signal processing through photodetector；
Narrow-linewidth laser light source sends continuous optical power signals, enters into end tail optical fiber through circulator, become end tail optical fiber from
Reflected by end breech face, reflected light enters photodetector through circulator, recently enters signal processing and display module, use
In power detection.
In technique scheme, described device is additionally provided with reference path, and described reference path includes optical branching device, described narrow
Live width LASER Light Source is connected with the input of optical branching device, and an outfan of optical branching device passes through circulator and becomes end tail optical fiber even
Connect, another outfan is connected with display module with described signal processing through photodetector；
Narrow-linewidth laser light source sends continuous optical power signals, and a road enters circulator, another Lu Jingguang through optical branching device
Shunt enters photodetector, recently enters signal processing and display module, for difference processing to improve accuracy of detection.
Further, described optical branching device is two-way power divider, and splitting ratio is 50：50.
In technique scheme, the free end breech face of described one-tenth end tail optical fiber is the flat end face vertical with its axis, and
Concordant with the end face of length scales.
In technique scheme, described one-tenth end tail optical fiber is G.652 optical fiber.
A kind of detection method of optical fiber oil water surface that the present invention provides, using aforementioned detection devices, walks including following
Suddenly：
1）Before measurement, using the free end breech face becoming end optical fiber of cleaning, measurement the aerial work(of recording equipment
Rate measured value P0；
2）By the one-tenth being arranged side by side end optical fiber together with length scales, immerse oil mixing with water liquid to be measured perpendicular to liquid level
In, when the power value changes recording, it is expressed as holding optical fiber to contact with pasta, record reflection power now, and reads length
The reading of scale, as oil reservoir original position；
3）The one-tenth being arranged side by side end optical fiber is immersed together with length scales further, when the performance number recording changes again
When, it is expressed as holding optical fiber to contact with the water surface, record reflection power now, and reads the reading of length scales, as water layer rises
Beginning position；
4）Calculation procedure 2）With step 3）The difference of middle length scales reading, the thickness of oil reservoir as in oil-water mixture.
The described step 4 of technique scheme）Also include calculating liquid medium refractive index njOperation：Known one-tenth end optical fiber
（4）Fiber core refractive index n1, incident optical power is Pi, reflected optical power is Pr, then
Refractive index n of the immersed medium of end optical fiber free end breech face can be obtained into accordinglyj.
The described step 4 of technique scheme）Also include calculating liquid medium and air relative index of refraction nj/n0Operation：
In formula, n0For air refraction, njBy becoming the refractive index of the immersed liquid medium of end optical fiber free end breech face, P0
For the aerial power measurement values of device, PrFor reflected optical power.
Compared with prior art, the beneficial effects of the present invention is：
1st, it is based on light and detect that essential safety meets requirement of explosion proof；
2nd, the structure of detection means is simple, easily fabricated, and the low cost manufacturing and using；
3rd, in operating, personnel can directly carry out observing the reading with length scales, directly perceived, convenient；
4th, utilize the intensity different realization detection of fiber end face reflected signal in different medium, because fiber end face is to anti-
The reaction penetrating rate is sensitive, and therefore variation of ambient temperature is displayed without affecting for " power value changes ", and interface location
Certainty of measurement is high；
5th, this detection method can be additionally used in obtaining liquid medium refractive index and liquid medium and air relative index of refraction, non-
Often it is applied to gasoline tankage size, the isoparametric detection of unclarified liquid refractive index, have broad application prospects.
Brief description
Fig. 1 is the structural representation of one embodiment of detection means of the present invention；
Fig. 2 is the use state schematic diagram of Fig. 1 device；
Fig. 3 is the reflectance spectrum figure becoming the fiber end face of end tail optical fiber in air, gasoline and water that certain records；
In figure：1 narrow-linewidth laser light source, 2 optical branching devices, 3 circulators, 4 one-tenth end tail optical fibers, 5 length scales,
6 double-light path photoelectric detectors, 7 signal processing and display module, 8 air, 9 gasoline, 10 water.
Specific embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail：
As shown in figure 1, a kind of detection means of optical fiber oil water surface of the present invention, including narrow-linewidth laser light source 1, light
Shunt 2, circulator 3, one-tenth end tail optical fiber 4, length scales 5, photodetector and signal processing and display module 7.The present embodiment
In, optical branching device 2 is two-way power divider, and photodetector is double-light path photoelectric detector 6.Narrow-linewidth laser light source 1 with
The input of optical branching device 2 connects, and an outfan of optical branching device 2 is passed through circulator 3 and is connected with one-tenth end tail optical fiber 4.Become end tail
Fine 4 preferred G.652 optical fiber, its free end is arranged side by side with length scales 5.For ease of reading, become the free end tail end of end tail optical fiber 4
Face is the flat end face vertical with its axis, and concordant with the end face of length scales 5.3rd port of circulator 3 and two-way
One signal input part connection of photodetector 6, the outfan of two-way photodetector 6 and signal processing and display module 7
It is connected.Another outfan of optical branching device 2 is connected with another signal input part of two-way photodetector 6, constitutes reference
Light path.
When this detection means is run, narrow-linewidth laser light source 1 sends the continuous optical power signals of milliwatt, and a road is through optical branching
Device 2 enters circulator 3, enters back into into end tail optical fiber 4 and reflects in the free end breech face becoming end tail optical fiber 4, reflected light is through ring
Shape device 3 enters two-way photodetector 6, and another road optical signal of narrow-linewidth laser light source 1 is directly entered two-way through optical branching device 2
Photodetector 6, recently enters signal processing and display module 7, signal processing two path signal to input with display module 7
Carry out difference processing, to eliminate the impact of light source power fluctuation, and calculate reflected optical power and liquid medium refractive index etc.,
Show result afterwards.For ease of calculating, the splitting ratio of two-way power divider is 50：50.
Application above-mentioned detection device, realize the detection of certain gasoline cistern, as shown in figure 3, in gasoline cistern from bottom-up successively
For water 10, gasoline 9 and air 8, concrete operations are：
1）Before measurement, using the free end breech face becoming end optical fiber 4 of cleaning, the power of calibration narrow-linewidth laser light source 1
For 5mW, measurement aerial power measurement values P of recording equipment0=68 μ W, the reflectance spectrum in air 8 is as shown in Figure 3；
2）By the one-tenth being arranged side by side end optical fiber 4 together with length scales 5, immerse oil mixing with water liquid to be measured perpendicular to liquid level
In, when signal processing and the power value changes of display module 7 display, it is expressed as holding optical fiber 4 to contact with gasoline 9 pasta, record
Reflection power now be 0.8 μ W, and read length scales 5 reading be 0.1m, as oil reservoir original position, reflectance spectrum is such as
Shown in Fig. 3；
3）The one-tenth being arranged side by side end optical fiber 4 is immersed together with length scales 5 further, when the performance number recording becomes again
During change, it is expressed as holding optical fiber 4 to contact with the water surface, record reflection power now is 4.7 μ W, and reads the reading of length scales 5
For 0.31m, as water layer original position, reflectance spectrum is as shown in Figure 3；
4）Calculation procedure 2）With step 3）The difference of middle length scales 5 reading, that is, obtain the thickness of gasoline layer in this gasoline cistern
Spend for 0.21m；Additionally, liquid medium can be calculated according to the following formula（It is gasoline 9 or water 10 in the present embodiment）Folding relative with air
Penetrate rate nj/n0Operation：
In formula, n0For air refraction, njBy becoming the refractive index of the immersed liquid medium of end optical fiber 4 free end breech face, P0
For the aerial power measurement values of device, PrFor reflected optical power.
This embodiment is taking the mixed liquor of gasoline 9 and water 10 as a example, it is true that this detection means is equally applicable to refractivity
The interfacial detection of the incompatible mixing liquid of other not less than 0.05, detection operation is similar；When mixing liquid species is three kinds
Or more when, apparatus of the present invention and method are still suitable for.
This detection means can be additionally used in measuring the refractive index of single liquid：The fiber core refractive index n of known one-tenth end optical fiber 41, enter
Penetrating luminous power is Pi, reflected optical power is Pr, then
Refractive index n of the immersed medium of end optical fiber free end breech face can be obtained into accordinglyj.
Claims (6)
1. a kind of method carrying out optical fiber oil water surface detection using detection means, described detection means includes narrow-linewidth laser
Light source (1), circulator (3), one-tenth end tail optical fiber (4), length scales (5), photodetector and signal processing and display module (7)；
Described narrow-linewidth laser light source (1) pass through circulator (3) with become end tail optical fiber (4) be connected, one-tenth end tail optical fiber (4) free end with described
Length scales (5) are arranged side by side, and the 3rd port of described circulator (3) is through photodetector with signal processing and display module
(7) it is connected；Narrow-linewidth laser light source (1) sends continuous optical power signals, enters into end tail optical fiber (4) through circulator (3), in Cheng Duan
The free end breech face of tail optical fiber (4) reflects, and reflected light enters photodetector through circulator (3), recently enters at signal
Reason and display module (7), for power detection；
Methods described comprises the steps：
1) before measuring, using the free end breech face at one-tenth end optical fiber (4) of cleaning, measurement the aerial power of recording equipment
Measured value P0；
2) by the one-tenth being arranged side by side end optical fiber (4) together with length scales (5), immerse oil mixing with water liquid to be measured perpendicular to liquid level
In, when the power value changes recording, it is expressed as holding optical fiber (4) to contact with pasta, record reflection power now, and reads length
The reading of anale settting scale (5), as oil reservoir original position；
3) one-tenth being arranged side by side end optical fiber (4) is immersed together with length scales (5) further, when the performance number recording becomes again
During change, it is expressed as holding optical fiber (4) to contact with the water surface, record reflection power now, and reads the reading of length scales (5), that is,
For water layer original position；
4) calculation procedure 2) and step 3) in length scales (5) reading difference, the thickness of oil reservoir as in oil-water mixture；Its
It is characterised by：
Described step 4) also include calculating liquid medium refractive index njOperation：The fiber core refractive index n of known one-tenth end optical fiber (4)1,
Incident optical power is Pi, reflected optical power is Pr,
Then
Refractive index n of the immersed medium of end optical fiber (4) free end breech face can be obtained into accordinglyj.
2. detection method according to claim 1 is it is characterised in that described step 4) also include calculating liquid medium with empty
Gas phase refractive index nj/n0Operation：
In formula, n0For air refraction, njBy becoming the refractive index of the immersed liquid medium of end optical fiber (4) free end breech face, P0For
The aerial power measurement values of device, Pr is reflected optical power.
3. method according to claim 1 it is characterised in that：Described detection means is additionally provided with reference path, described reference
Light path includes optical branching device (2), and described narrow-linewidth laser light source (1) is connected with the input of optical branching device (2), optical branching device
(2) a outfan pass through circulator (3) with one-tenth end tail optical fiber (4) be connected, another outfan through photodetector with described
Signal processing is connected with display module (7)；
Narrow-linewidth laser light source (1) sends continuous optical power signals, and a road enters circulator (3), Ling Yilu through optical branching device (2)
Enter photodetector through optical branching device (2), recently enter signal processing and display module (7), for difference processing to improve
Accuracy of detection.
4. method according to claim 3 it is characterised in that：Described optical branching device (2) is two-way power divider, light splitting
Than for 50：50.
5. method according to claim 1 it is characterised in that：The free end breech face of described one-tenth end tail optical fiber (4) is and it
The vertical flat end face of axis, and concordant with the end face of length scales (5).
6. method according to claim 1 it is characterised in that：Described one-tenth end tail optical fiber (4) is G.652 optical fiber.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104089682B (en) * | 2014-07-18 | 2018-01-12 | 厦门大学 | A kind of liquid level detection device and its detection method |
| CN107784644B (en) * | 2016-08-25 | 2019-12-06 | 台州道致科技股份有限公司 | method and device for determining interface of immiscible liquid |
| CN108387554B (en) * | 2018-02-01 | 2018-11-27 | 新疆农业大学 | A kind of fiber reflection formula mixed layer interface gauge and method |
| CN108519135B (en) * | 2018-04-27 | 2020-07-17 | 水利部交通运输部国家能源局南京水利科学研究院 | Automatic optical fiber correlation type liquid interface measuring device and method thereof |
| CN112816028B (en) * | 2019-11-15 | 2022-03-11 | 北汽福田汽车股份有限公司 | Liquid level measuring device, oil tank and vehicle |
| CN111982862B (en) * | 2020-08-01 | 2023-10-27 | 中国石油天然气股份有限公司 | Calculation method for gas-liquid two-phase flow gas holding rate of optical fiber sensor |
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