CN106482808A - A kind of liquid level sensor based on quartzy glass capillary and preparation method - Google Patents
A kind of liquid level sensor based on quartzy glass capillary and preparation method Download PDFInfo
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- CN106482808A CN106482808A CN201610817092.1A CN201610817092A CN106482808A CN 106482808 A CN106482808 A CN 106482808A CN 201610817092 A CN201610817092 A CN 201610817092A CN 106482808 A CN106482808 A CN 106482808A
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- liquid level
- glass capillary
- optical fibre
- level sensor
- glass
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- 239000011521 glass Substances 0.000 title claims abstract description 73
- 239000007788 liquid Substances 0.000 title claims abstract description 65
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 239000013307 optical fiber Substances 0.000 claims abstract description 46
- 239000000835 fiber Substances 0.000 claims abstract description 27
- 238000005259 measurement Methods 0.000 claims abstract description 16
- 230000008859 change Effects 0.000 claims abstract description 8
- 238000001514 detection method Methods 0.000 claims abstract description 5
- 238000003466 welding Methods 0.000 claims description 17
- 230000005540 biological transmission Effects 0.000 claims description 8
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 4
- 238000005253 cladding Methods 0.000 claims description 4
- 230000032683 aging Effects 0.000 abstract description 3
- 238000007654 immersion Methods 0.000 abstract description 3
- 241000931526 Acer campestre Species 0.000 abstract 1
- 230000003287 optical effect Effects 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012536 packaging technology Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 230000001953 sensory effect Effects 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
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- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 238000000411 transmission spectrum Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
The invention discloses a kind of liquid level sensor based on quartzy glass capillary and preparation method, the sensor includes glass capillary, and glass capillary two ends are provided with input optical fibre and output optical fibre；The input of liquid level sensor is connected with mono-colour laser by input optical fibre, and output end is connected with power detector by output optical fibre, and input optical fibre and output optical fibre are single-mode fiber；The internal diameter of glass capillary is 75 μm, and external diameter is 125 μm, and length is 10～50mm；By liquid level sensor vertical immersion in a liquid, when in detection container, liquid height changes, in glass capillary there is corresponding change in the through-put power of each resonance wave strong point, and the Strength Changes for detecting optical maser wavelength by power detector realize the measurement to height of liquid level.The liquid level sensor of the present invention is not easy aging, long service life, and high pressure resistant, anticorrosive, anti-electromagnetic interference capability is strong, installs simple, small volume, lightweight.
Description
Technical field
The present invention relates to sensory field of optic fibre, more particularly to a kind of liquid level sensor based on quartzy glass capillary and system
Preparation Method.
Background technology
The scope that level gauging is related to widely, including level gauging industrially and in terms of environmental monitoring
Application.Current liquid level, surpasses including radio-frequency capacity liquid level gauge, called putting-into-type liquid level meter, magnetostriction liquidometer in respect of many kinds
Sonic liquid-level meter etc..The above two are to change electric capacity or resistance value using hydraulic pressure, so as to change into hydraulic pressure at electric signal output
Reason, both are then to calculate liquid level by measuring the time difference between transmitting electric pulse afterwards.Liquid level based on electric treatment is passed above
Sensor typically all contains the conversion of electric signal, and the process such as the transmission of electric signal and process then may in practical application
Affected by electromagnetic interference.In addition electronic device is easily aging, or by special liquid corrosion, needs corresponding packaging technology
Ensure the service life of device.
With the development of industrial technology, the kind of fluid to be measured is more and more, especially flammable hydrocarbon, liquid
Toxic liquid in terms of chemical fuel and biochemistry etc..Senser element based on electric signal is used in inflammable and explosive environment
When need plus very big explosion-protection equipment, application is limited by very large.Now with the development of industrial technology, fluid to be measured
Kind is more and more.As the species of measured medium is various, the physicochemical properties of medium are also sufficiently complex, field working conditions
Also relatively more severe, traditional liquid level sensor using when constantly face new problem.Comparatively, fibre optic liquid level sensor has
The advantage that a lot of traditional sensors can not be compared, such as high pressure resistant, anticorrosive, electromagnetism interference etc., and simple, body is installed
Product is little, lightweight.
Content of the invention
The technical problem to be solved in the present invention is easily to be subject to electromagnetic interference for liquid level sensor in prior art, or
The defect that is corroded by special liquid, provides a kind of liquid level sensor based on quartzy glass capillary and preparation method.
The technical solution adopted for the present invention to solve the technical problems is：
The present invention provides a kind of liquid level sensor based on quartzy glass capillary, including glass capillary, capillary glass
Pipe two ends are provided with input optical fibre and output optical fibre；The input of liquid level sensor is by input optical fibre and mono-colour laser phase
Even, output end is connected with power meter by output optical fibre, and input optical fibre and output optical fibre are single-mode fiber；Glass capillary
Internal diameter is 75 μm, and external diameter is 125 μm, and length is 10～50mm；By liquid level sensor vertical immersion in a liquid, work as detection container
When middle liquid height changes, in glass capillary there is corresponding change in the through-put power of each resonance wave strong point, by work(
The Strength Changes of rate meter detection peak transmission wavelength realize the measurement to height of liquid level.
Further, the mono-colour laser of the present invention is input light source, and its wavelength is particular value, including：1185nm,
1210nm, 1235nm, 1262nm, 1290nm.
Further, the input optical fibre of the present invention, output optical fibre are identical with glass capillary external diameter, and fiber core is just right
Capillary tube hub, carries out welding between three by way of to core welding.
Further, the outer cladding diameter of the input optical fibre of the present invention and output optical fibre is 125 μm, and core diameter is 8 μm.
The present invention provides a kind of preparation method of the liquid level sensor based on quartzy glass capillary, comprises the following steps：
S1, glass capillary pretreatment：A glass capillary is chosen, its internal diameter is 75 μm, external diameter is 125 μm, uses
The armor coated of glass tube got rid of by blade, and with alcohol wipe glass pipe surface to remove coat residue；Using light
Fine cutter one end of glass tube is cut flat with whole, then be spaced 10～50mm distance, cut out another smooth end face；
S2, welding single-mode fiber：Using the manual operation function of optical fiber splicer, by input and the single-mode optics of output end
Fine fibre core and the center manual alignment of glass capillary；Arrange optical fiber splicer splicing parameter be：20 unit of strength of discharge,
Discharge time 700ms, pretreated glass capillary and single-mode fiber is carried out welding and obtains liquid level sensor.
The beneficial effect comprise that：The liquid level sensor based on quartzy glass capillary of the present invention, by inspection
Measurement of the Strength Changes realization of peak transmission wavelength in glass capillary to height of liquid level is surveyed, measurement effect is good, high precision can
It is widely used in various actual scenes；And the sensor is not easy aging, long service life, high pressure resistant, anticorrosive, anti-electromagnetism
Interference performance is strong, installs simple, small volume, lightweight.
Description of the drawings
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing：
Fig. 1 (a) is the structural representation of the liquid level sensor cross section of the embodiment of the present invention；
Fig. 1 (b) is the liquid level sensor structural representation of the embodiment of the present invention；
Fig. 2 is the measurement structural representation of the embodiment of the present invention；
Fig. 3 is the liquid level intensity linear graph of the embodiment of the present invention；
In figure, 1- input optical fibre, 2- glass capillary, 3- output optical fibre.
Specific embodiment
In order that the objects, technical solutions and advantages of the present invention become more apparent, below in conjunction with drawings and Examples, right
The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only in order to explain the present invention, not
For limiting the present invention.
As shown in Fig. 1 (a), the liquid level sensor based on quartzy glass capillary of the embodiment of the present invention, including capillary glass
Glass pipe 2,2 two ends of glass capillary are provided with input optical fibre 1 and output optical fibre 2；The input of liquid level sensor passes through input light
Fine 1 is connected with mono-colour laser, and output end is connected with power meter by output optical fibre 3, and input optical fibre 1 and output optical fibre 2 are
Single-mode fiber；The internal diameter of glass capillary 2 is 75 μm, and external diameter is 125 μm, and length is 10～50mm；Liquid level sensor is vertical
Submergence in a liquid, when in detection container, liquid height changes, the transmission of each resonance wave strong point in glass capillary 2
There is corresponding change in power, the Strength Changes for detecting peak transmission wavelength by power meter realize the measurement to height of liquid level.
Mono-colour laser is input light source, and its wavelength is particular value, including：1185nm, 1210nm, 1235nm, 1262nm,
1290nm.Input optical fibre 1, output optical fibre 3 are identical with 2 external diameter of glass capillary, and fiber core is just to capillary tube hub, three
Between carry out welding by way of to core welding.The outer cladding diameter of input optical fibre 1 and output optical fibre 3 is 125 μm, and fibre core is straight
Footpath is 8 μm.
In another specific embodiment of the present invention, the glass capillary cross section of the liquid level sensor has inside and outside two
Layer, 75 μm of internal diameter, 125 μm of external diameter.Single-mode fiber used is standard single-mode fiber, 125 μm of outer cladding diameter, 8 μm of core diameter.
Glass capillary two ends and single-mode fiber are constituted the sensor to core welding.When by glass tube vertical immersion in liquid,
The change of liquid level can cause the Strength Changes of transmission peaks in transmission spectrum, high to liquid level to realize by the intensity for monitoring transmission peaks
Low measurement.
With wavelength as particular value, the one-wavelength laser of (1185nm, 1210nm, 1235nm, 1262nm, 1290nm) is input light
Source, after being transferred to glass tube, can realize the measurement to liquid level by monitoring output laser power.
The preparation method of the liquid level sensor based on quartzy glass capillary of the embodiment of the present invention, comprises the following steps：
S1, glass capillary pretreatment：A glass capillary is chosen, its internal diameter is 75 μm, external diameter is 125 μm, uses
The armor coated of glass tube got rid of by blade, and with alcohol wipe glass pipe surface to remove coat residue；Using light
Fine cutter one end of glass tube is cut flat with whole, then be spaced 10～50mm distance, cut out another smooth end face；
S2, welding single-mode fiber：Using the manual operation function of optical fiber splicer, by input and the single-mode optics of output end
Fine fibre core and the center manual alignment of glass capillary；Arrange optical fiber splicer splicing parameter be：20 unit of strength of discharge,
Discharge time 700ms, pretreated glass capillary and single-mode fiber is carried out welding and obtains liquid level sensor.
In another specific embodiment of the present invention, the preparation method of the sensor is specially：
First, glass capillary pretreatment.One end glass capillary is chosen, and the coating protection of glass tube is got rid of using blade
Layer, and with alcohol wipe glass pipe surface to remove coat residue.One end of glass tube is cut flat with using optical fiber cutter
Whole, then away from one segment distance of end face, another smooth end face is being cut out, specific distance is decided according to the actual requirements,
Here we choose 13mm.
Two and the welding of general single mode fiber.The glass capillary for processing finally needs and single-mode fiber is welding together
To complete the making of whole device.Welding using optical fiber splicer manual operation function completing.To ensure during manual alignment
Both fibre cores are faced, and prevent dislocation from causing multiple-mode interfence.Splicing parameter is set to 20 unit of strength of discharge, discharge time
700ms, the two ends of the glass capillary for processing all are completed the making of sensor by single-mode fiber in above-mentioned requirements welding.
3rd, the temperature of sensor and level gauging application：
When liquid level sensor is used for liquid level to be measured, the probe segment of device is capillary glass tube portion, is disposed vertically
In liquid level part to be surveyed.When the water surface starts submergence glass capillary, the through-put power of device can change, output wavelength
Intensity can increase with the increase of the depth of glass capillary submergence, during whole measurement liquid level, the depth of intensity
Degree response is showed must compare linearly, and certainty of measurement can arrive millimeter magnitude.Fig. 3 is acquired by power level measurement in experiment
Depth sensitivity.Understand that by diagram the depth sensitivity in spectrum is 0.906mm/dB.Measurement gained depth value D can by with
Lower formula is obtained：
DMeasurement=(IMeasurement-IInitially)×0.906
IMeasurementAnd IInitiallyIt is measurement and initial spectral depth value.It should be appreciated that coming to those of ordinary skill in the art
Say, can be improved according to the above description or convert, and all these modifications and variations should all belong to right appended by the present invention
The protection domain of requirement.
Claims (5)
1. a kind of liquid level sensor based on quartzy glass capillary, it is characterised in that including glass capillary (2), capillary glass
Glass pipe (2) two ends are provided with input optical fibre (1) and output optical fibre (2)；The input of liquid level sensor by input optical fibre (1) with
Mono-colour laser is connected, and output end is connected with power meter by output optical fibre (3), and input optical fibre (1) and output optical fibre (2) are
Single-mode fiber；The internal diameter of glass capillary (2) is 75 μm, and external diameter is 125 μm, and length is 10～50mm；Liquid level sensor is hung down
Straight submergence in a liquid, when in detection container, liquid height changes, each resonance wave strong point in glass capillary (2)
There is corresponding change in through-put power, the Strength Changes for detecting peak transmission wavelength by power meter realize the measurement to height of liquid level.
2. the liquid level sensor based on quartzy glass capillary according to claim 1, it is characterised in that mono-colour laser
For being input into light source, its wavelength is particular value, including：1185nm, 1210nm, 1235nm, 1262nm, 1290nm.
3. the liquid level sensor based on quartzy glass capillary according to claim 1, it is characterised in that input optical fibre
(1), output optical fibre (3) is identical with glass capillary (2) external diameter, and fiber core passes through between three just to capillary tube hub
Mode to core welding carries out welding.
4. the liquid level sensor based on quartzy glass capillary according to claim 1, it is characterised in that input optical fibre
(1) and output optical fibre (3) outer cladding diameter be 125 μm, core diameter be 8 μm.
5. the preparation method of the liquid level sensor based on quartzy glass capillary of a kind of claim 1, it is characterised in that include
Following steps：
S1, glass capillary pretreatment：A glass capillary is chosen, its internal diameter is 75 μm, and external diameter is 125 μm, using blade
The armor coated of glass tube is got rid of, and with alcohol wipe glass pipe surface to remove coat residue；Cut using optical fiber
Cutter one end of glass tube is cut flat with whole, then be spaced 10～50mm distance, cut out another smooth end face；
S2, welding single-mode fiber：Using the manual operation function of optical fiber splicer, by the single-mode fiber of input and output end
Fibre core and the center manual alignment of glass capillary；Arrange optical fiber splicer splicing parameter be：20 unit of strength of discharge, electric discharge
Time 700ms, pretreated glass capillary and single-mode fiber is carried out welding and obtains liquid level sensor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610817092.1A CN106482808A (en) | 2016-09-12 | 2016-09-12 | A kind of liquid level sensor based on quartzy glass capillary and preparation method |
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| CN201610817092.1A CN106482808A (en) | 2016-09-12 | 2016-09-12 | A kind of liquid level sensor based on quartzy glass capillary and preparation method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106989795A (en) * | 2017-03-10 | 2017-07-28 | 上海电机学院 | A kind of Hollow-Core Photonic Crystal Fibers liquid level sensor and its making, application method |
| CN110553774A (en) * | 2018-06-01 | 2019-12-10 | 武汉理工大学 | Miniature full-quartz optical fiber Fizeau cavity high-frequency dynamic pressure sensor and manufacturing method thereof |
| CN114607942A (en) * | 2022-04-21 | 2022-06-10 | 国仪量子(合肥)技术有限公司 | Liquid conveying control method and resonant cavity liquid conveying system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106989795A (en) * | 2017-03-10 | 2017-07-28 | 上海电机学院 | A kind of Hollow-Core Photonic Crystal Fibers liquid level sensor and its making, application method |
| CN110553774A (en) * | 2018-06-01 | 2019-12-10 | 武汉理工大学 | Miniature full-quartz optical fiber Fizeau cavity high-frequency dynamic pressure sensor and manufacturing method thereof |
| CN114607942A (en) * | 2022-04-21 | 2022-06-10 | 国仪量子(合肥)技术有限公司 | Liquid conveying control method and resonant cavity liquid conveying system |
| CN114607942B (en) * | 2022-04-21 | 2024-04-26 | 国仪量子技术(合肥)股份有限公司 | Liquid delivery control method and resonant cavity liquid delivery system |
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Application publication date: 20170308 |
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