CN105444839A - Plastic optical fiber liquid level sensor based on light time-domain reflecting technology and measuring method - Google Patents
Plastic optical fiber liquid level sensor based on light time-domain reflecting technology and measuring method Download PDFInfo
- Publication number
- CN105444839A CN105444839A CN201510795296.5A CN201510795296A CN105444839A CN 105444839 A CN105444839 A CN 105444839A CN 201510795296 A CN201510795296 A CN 201510795296A CN 105444839 A CN105444839 A CN 105444839A
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- Prior art keywords
- optical fiber
- plastic optical
- liquid level
- level sensor
- mouth
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- 239000007788 liquid Substances 0.000 title claims abstract description 54
- 239000013308 plastic optical fiber Substances 0.000 title claims abstract description 52
- 238000005516 engineering process Methods 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims abstract description 10
- 239000013307 optical fiber Substances 0.000 claims abstract description 22
- 230000003287 optical effect Effects 0.000 claims description 22
- 238000005452 bending Methods 0.000 abstract description 2
- 238000009776 industrial production Methods 0.000 abstract description 2
- 239000000835 fiber Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000035772 mutation Effects 0.000 description 4
- 239000002360 explosive Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000006424 Flood reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-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
Abstract
The invention relates to the technical field of optical fiber sensing, in particular to a plastic optical fiber liquid level sensor based on a light time-domain reflecting technology and a measuring method and provides an optical fiber liquid level sensor with the measuring range of 20 m and the resolution ratio superior to 2 cm and a measuring method. The sensor is large in measuring range, high in precision and high in resolution ratio. The plastic optical fiber liquid level sensor based on the light time-domain reflecting technology comprises a picosecond laser, an optical fiber circulator, a photon counter and a plastic optical fiber, wherein the optical fiber circulator is provided with a port a, a port b and a port c, the picosecond laser is connected with the port a, the photon counter is connected with the port c, the plastic optical fiber is connected with the port b, one end of the plastic optical fiber is immersed into liquid to be tested, and the plastic optical fiber and the liquid level, upper side and the lower side of the liquid to be tested are configured to be of S-shaped structures with macro-bending radius. The plastic optical fiber liquid level sensor is mainly applied to industrial production, especially to dangerous environments, such as flammable and combustible environments.
Description
Technical field
The present invention relates to technical field of optical fiber sensing, more specifically, relate to a kind of plastic optical fiber liquid level sensor based on optical time domain reflection technology and measuring method.
Background technology
The level sensing of flammable and combustible liquids is the major issue faced in commercial production, based on the level sensing technology of Fibre Optical Sensor owing to having photodetachment, for inflammable and explosive liquid level inspection provides a kind of high security solution.Existing fiber liquid level sensor generally has two kinds, and namely based on single-mode quartz optical fibers wavelength-modulation technique and plastic optical fiber intensity modulated technology, the former resolution is high, but range is usually less and be difficult in theory improve; And the latter's resolution, precision are all poor, but range is very large.Like this, existing fiber liquid level sensor is all not enough to adapt to demand of industrial production.
Summary of the invention
In order to overcome the deficiency of fibre optic liquid level sensor in commercial production in prior art, the invention provides a kind of range is better than 2cm fibre optic liquid level sensor and measuring method in 20m, resolution, this transducer range is large, precision is high, resolution is high, is particularly suitable in commercial production the inflammable and explosive level gauging waiting dangerous liquid.
In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is:
Based on the plastic optical fiber liquid level sensor of optical time domain reflection technology, comprise picosecond laser, optical fiber circulator, photon counter and plastic optical fiber, described optical fiber circulator is provided with a mouth, b mouth and c mouth, described picosecond laser is connected with a mouth, described photon counter is connected with c mouth, described plastic optical fiber is connected with b mouth, and one end of described plastic optical fiber is immersed in testing liquid.
Liquid level and the upper and lower both sides of described plastic optical fiber and testing liquid are set to the S type structure with macrobending radius.
Based on the measuring method of the plastic optical fiber liquid level sensor of optical time domain reflection technology, the picopulse visible ray that picosecond laser sends is coupled in plastic optical fiber through optical fiber circulator, the liquid level non-sensitive part of plastic optical fiber has been made into S type structure, rear scattered light returns along the former road of plastic optical fiber and is detected by photon counter after optical fiber circulator, is obtained the positional information of liquid level by the optical time domain reflection signal detected.
The beneficial effect that compared with prior art the present invention has is:
The present invention proposes based on plastic optical fiber optical time domain reflection technology level sensing technology, plastic optical fiber is prepared into continuous S type macrobending structure, light has different rear scattering states when transmitting in the optical fiber macrobending structure that liquid level is upper and lower, cause rear scattered signal to produce sudden change, carry out feature extraction and analyze obtaining high-resolution liquid level information to this signal.This design proposal not only remains the feature of plastic optical fiber liquid level sensor wide range, improves its measuring accuracy and resolution simultaneously, is particularly suitable in commercial production the inflammable and explosive level gauging waiting dangerous liquid.
Accompanying drawing explanation
Below by accompanying drawing, the specific embodiment of the present invention is described in further detail.
Fig. 1 is structural representation of the present invention;
Fig. 2 is the schematic diagram of S plastic optical fiber of the present invention and liquid level position;
Fig. 3 is that liquid level position of the present invention affects schematic diagram to optical time domain reflection signal.
In figure: 1 be picosecond laser, 2 be optical fiber circulator, 3 be photon counter, 4 be plastic optical fiber, 5 be liquid level, 6 for optical time domain reflection signal.
Embodiment
The invention will be further described by reference to the accompanying drawings for embodiment below.
Principle of work of the present invention is: plastic optical fiber 4 is prepared the S type structure with continuous macrobending, the energy of the light signal transmitted in liquid level 5 place optical fiber will be undergone mutation, the position that this sudden change judges liquid level 5 is measured by adopting optical time domain reflection technology, described S type structural plastic optical fiber 4 refers to and plastic optical fiber 4 is carried out certain bending, the guide-lighting ability of this structured optical fiber will be subject to the impact of external environment condition refractive index, described optical time domain reflection technology refers to and adopts picosecond laser to be coupled into plastic optical fiber 4, rear scattering is constantly being there is in laser along in Optical Fiber Transmission process, due to light signal energy liquid level place undergo mutation cause after scattered light signal also occur sharply to change, rear scattered light prolongs the former road of plastic optical fiber 4 and returns, the mistiming of suddenling change by measuring the picosecond laser that sends and rear scattered light accurately judges the position of liquid level 5.Be specially: the picopulse visible light signal that picosecond laser 1 sends is injected in plastic optical fiber 4, plastic optical fiber 4 is made with the S type structure of certain curvature radius, the plastic optical fiber 4 loss difference being in liquid level 5 upper and lower causes rear scattered signal to be undergone mutation, and collects current liquid level information by photon counter 3 to rear scattered signal.
As shown in Figure 1, plastic optical fiber liquid level sensor of the present invention comprises picosecond laser 1, optical fiber circulator 2, photon counter 3, plastic optical fiber 4.The picopulse visible ray that picosecond laser 1 sends is coupled in plastic optical fiber 4 through optical fiber circulator 2, the liquid level non-sensitive part of plastic optical fiber 4 has been made into have S type structure, rear scattered light returns along the former road of plastic optical fiber 4 and is detected by photon counter 3 after optical fiber circulator 2, obtains the optical time domain reflection signal comprising liquid level 5 positional information.
As shown in Figure 2, the non-sensitive part of plastic optical fiber 4 is made with the S type structure of certain macrobending radius R, for the measurement of liquid level 5 position.
As shown in Figure 3, the position that liquid level 5 floods plastic optical fiber 4 can be reacted to some extent on back reflection light and optical time domain reflection signal 6.The attenuation coefficient of the optical time domain reflection signal 6 above liquid level 5 is less, and the attenuation coefficient being in the optical time domain reflection signal 6 below liquid level 5 is larger, in the position of liquid level 5, optical time domain reflection signal 6 is undergone mutation, measured the reflection interval obtaining optical time domain reflection signal 6 and suddenly change by photon counter 3, the height change of liquid level 5 can be conversed according to following formula:
h=
?t?v
In above formula,
be the macrobending radius of plastic optical fiber 4, t is the mistiming that picosecond laser 1 sends optical time domain reflection signal 6 that pulse signal and photon counter 3 obtain and suddenlys change,
the velocity of propagation of light signal in plastic optical fiber 4.
Drawings and Examples described herein are only in order to illustrate that technical solution of the present invention is not intended to limit; Although with reference to preferred embodiment to invention has been comparatively detailed description, it will be understood by those skilled in the art that; Still can modify to the specific embodiment of the present invention or equivalent replacement is carried out to portion of techniques feature; And not departing from the spirit of the present invention program, it all should be encompassed in the middle of the technical scheme scope of request of the present invention protection.
Claims (3)
1. based on the plastic optical fiber liquid level sensor of optical time domain reflection technology, it is characterized in that: comprise picosecond laser (1), optical fiber circulator (2), photon counter (3) and plastic optical fiber (4), described optical fiber circulator (2) is provided with a mouth, b mouth and c mouth, described picosecond laser (1) is connected with a mouth, described photon counter (3) is connected with c mouth, described plastic optical fiber (4) is connected with b mouth, and one end of described plastic optical fiber (4) is immersed in testing liquid.
2. a kind of plastic optical fiber liquid level sensor based on optical time domain reflection technology according to claim 1, is characterized in that: the liquid level (5) of described plastic optical fiber (4) and testing liquid and upper and lower both sides are set to have the S type structure of macrobending radius.
3. based on the measuring method of the plastic optical fiber liquid level sensor of optical time domain reflection technology, it is characterized in that: the picopulse visible ray that picosecond laser (1) sends is coupled in plastic optical fiber (4) through optical fiber circulator (2), the liquid level non-sensitive part of plastic optical fiber (4) has been made into S type structure, rear scattered light returns along plastic optical fiber (4) former road and is detected by photon counter (3) after optical fiber circulator (2), is obtained the positional information of liquid level (5) by the optical time domain reflection signal (6) detected.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510795296.5A CN105444839B (en) | 2015-11-18 | 2015-11-18 | Plastic optical fiber liquid level sensor and measurement method based on optical time domain reflection technology |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510795296.5A CN105444839B (en) | 2015-11-18 | 2015-11-18 | Plastic optical fiber liquid level sensor and measurement method based on optical time domain reflection technology |
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| CN105444839A true CN105444839A (en) | 2016-03-30 |
| CN105444839B CN105444839B (en) | 2019-09-20 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108981855A (en) * | 2018-06-26 | 2018-12-11 | 河海大学 | A kind of water level monitoring device and monitoring method based on plastic optical fiber optical time domain reflection |
| GB2576773A (en) * | 2018-08-31 | 2020-03-04 | Advanced Fibreoptic Eng Ltd | Fluid level sensing device and method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4240747A (en) * | 1979-10-03 | 1980-12-23 | Battelle Memorial Institute | Refractive-index responsive light-signal system |
| JPS6365321A (en) * | 1986-09-08 | 1988-03-23 | Nagoyashi | Optical liquid level sensor |
| JP4070548B2 (en) * | 2002-09-06 | 2008-04-02 | 株式会社潤工社 | Fiber optic and liquid sensors |
| KR20100072671A (en) * | 2008-12-22 | 2010-07-01 | 한국항공우주연구원 | Liquid level measuring sensor made of optical fibers |
| CN104089682A (en) * | 2014-07-18 | 2014-10-08 | 厦门大学 | Liquid level measurement device and method |
-
2015
- 2015-11-18 CN CN201510795296.5A patent/CN105444839B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4240747A (en) * | 1979-10-03 | 1980-12-23 | Battelle Memorial Institute | Refractive-index responsive light-signal system |
| JPS6365321A (en) * | 1986-09-08 | 1988-03-23 | Nagoyashi | Optical liquid level sensor |
| JP4070548B2 (en) * | 2002-09-06 | 2008-04-02 | 株式会社潤工社 | Fiber optic and liquid sensors |
| KR20100072671A (en) * | 2008-12-22 | 2010-07-01 | 한국항공우주연구원 | Liquid level measuring sensor made of optical fibers |
| CN104089682A (en) * | 2014-07-18 | 2014-10-08 | 厦门大学 | Liquid level measurement device and method |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108981855A (en) * | 2018-06-26 | 2018-12-11 | 河海大学 | A kind of water level monitoring device and monitoring method based on plastic optical fiber optical time domain reflection |
| GB2576773A (en) * | 2018-08-31 | 2020-03-04 | Advanced Fibreoptic Eng Ltd | Fluid level sensing device and method |
| US11047726B2 (en) | 2018-08-31 | 2021-06-29 | The Boeing Company | Fluid level sensing device and method of determining a fluid level comprising an optical waveguide with successive ones of curved portions being curved in alternating directions |
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| CN105444839B (en) | 2019-09-20 |
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