CN111486913A - Optical fiber flowmeter with fluorescent material and control method - Google Patents
Optical fiber flowmeter with fluorescent material and control method Download PDFInfo
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- CN111486913A CN111486913A CN202010338302.5A CN202010338302A CN111486913A CN 111486913 A CN111486913 A CN 111486913A CN 202010338302 A CN202010338302 A CN 202010338302A CN 111486913 A CN111486913 A CN 111486913A
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- 239000000463 material Substances 0.000 title claims abstract description 87
- 239000013307 optical fiber Substances 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims description 15
- 239000012530 fluid Substances 0.000 claims abstract description 74
- 230000003287 optical effect Effects 0.000 claims abstract description 43
- 239000000523 sample Substances 0.000 claims abstract description 19
- 238000012545 processing Methods 0.000 claims description 23
- 230000005693 optoelectronics Effects 0.000 claims description 16
- 238000010438 heat treatment Methods 0.000 claims description 15
- 239000000835 fiber Substances 0.000 claims description 11
- 238000011144 upstream manufacturing Methods 0.000 claims description 8
- 230000005284 excitation Effects 0.000 claims description 4
- 238000005259 measurement Methods 0.000 abstract description 4
- 230000010354 integration Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- 238000002795 fluorescence method Methods 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000011540 sensing material Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
- G01F1/86—Indirect mass flowmeters, e.g. measuring volume flow and density, temperature or pressure
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
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Abstract
The invention provides an optical fiber flowmeter with fluorescent material, which is used for determining the mass flow of fluid in a fluid pipe and comprises: two spaced fluorescent materials (1); two optical fibers (3) respectively arranged at intervals of the two fluorescent materials (1) and used for transmitting light sources; the photoelectric module (5) is connected with the two optical fibers (3) and is used for emitting high-energy light beams and receiving optical signals from the optical fibers (3) and converting the optical signals into electric signals; the upper computer (7) is connected with the photoelectric module (5) and is used for determining and storing the mass flow of the fluid; the two fluorescent materials (1) arranged at intervals are respectively attached to the outer tube wall of a fluid tube (4). The optical probe and the fluorescent material adopted by the invention can be very small in geometric size, the corresponding heat capacity is also very small, the measurement responsivity is high, and the miniaturization and the integration are facilitated. The invention has simple structure, convenient use, accurate measurement and extremely high commercial value.
Description
Technical Field
The invention belongs to the technical field of flow detection and the technical field of optical fiber sensing, relates to a thermal mass flowmeter, and particularly relates to an optical fiber flowmeter with a fluorescent material and a control method.
Background
Thermal mass flowmeters are meters that measure mass flow using the principle of thermal conduction, and usually consist of two reference thermal resistors placed on the wall of the pipe. A common measurement method is to apply a predetermined voltage or pass a predetermined current to the two thermal resistors, thereby generating heat and transferring the heat to the fluid in the tube. When the fluid is at rest, the temperature of the thermal resistors at the upstream and downstream sides is equal, and when the fluid flows, the temperature at the downstream side is higher than that at the upstream side and increases approximately linearly as the mass flow rate of the fluid increases. Because the resistance value of the thermal resistor is related to the temperature monotony, the resistance difference of the upstream thermal resistor and the downstream thermal resistor can be converted into potential difference by utilizing the bridge circuit to detect the temperature difference, and thus the mass flow of the fluid is calculated.
The thermal resistance of the thermal mass flowmeter is used as a heating source and a temperature measuring source, is greatly influenced by solid heat conduction and heat radiation of the hot wire, is easily influenced by external electromagnetic interference and temperature, and is low in precision. There is a phenomenon of aging of the hot wire, which must be calibrated regularly. The device can not be applied to severe narrow spaces (such as toxic, inflammable, explosive, high-temperature and high-voltage, strong electromagnetic interference and the like).
How to overcome the technical defects and accurately calculate the mass flow of the fluid becomes a technical problem to be solved at present, and in the prior art, a technical scheme capable of effectively solving the technical problem does not exist, that is, an optical fiber flowmeter with a fluorescent material and a control method do not exist.
Disclosure of Invention
In view of the shortcomings in the prior art, it is an object of the present invention to provide a fiber optic flowmeter with fluorescent material and a control method thereof, and according to one aspect of the present invention, a fiber optic flowmeter with fluorescent material for determining the mass flow rate of fluid in a fluid pipe is provided, which includes:
two spaced fluorescent materials for emitting long wavelength fluorescence;
two optical fibers respectively arranged at intervals of the two fluorescent materials and used for transmitting a light source;
the photoelectric module is connected with the two optical fibers and is used for emitting high-energy light beams and receiving optical signals from the optical fibers 3 and converting the optical signals into electric signals;
the upper computer is connected with the photoelectric module and is used for determining and storing the mass flow of the fluid; wherein,
the two fluorescent materials arranged at intervals are respectively attached to the outer pipe wall of a fluid pipe.
Preferably, the optical module further comprises an optical probe, and in an operating state, the optical probe is used for detecting an optical signal of the fluorescent material and transmitting the optical signal to the optoelectronic module through an optical fiber.
Preferably, the device further comprises a data processing module, wherein the data processing module is respectively connected with the photoelectric module and the upper computer and is used for converting the electric signal into a temperature signal and calculating the mass flow of the fluid.
Preferably, the fluorescent lamp further comprises a heater which is arranged on the outer tube wall of the fluid tube and is used for heating the fluorescent material.
Preferably, the optical probe further comprises an optical lens, wherein the optical lens is arranged on the optical probe and is used for converging the light beam on the fluorescent material.
Preferably, the device further comprises a light source arranged on the optoelectronic module, and the light source is used for exciting the light source and emitting a high-energy light beam.
Preferably, the connection between the upper computer and the data processing module is in the following mode:
-a limited cable mode;
wireless cable mode.
According to another aspect of the present invention, there is provided a method for controlling a fiber optic flowmeter having a fluorescent material, which determines a mass flow rate of a fluid in a fluid pipe using the control device, comprising the steps of:
a: heating two fluorescent materials attached to the outer tube wall of the fluid tube;
b: exciting the two fluorescent materials to emit two long-wavelength fluorescent lights based on the optoelectronic module;
c: determining a mass flow rate of fluid within the fluid tube based on the two long wavelength fluorescences.
Preferably, in the step a, the heating of the fluorescent material is achieved by:
-a high-energy light beam emitted by the photovoltaic module;
-a heater; or
-a thermal fluid arranged between the fluorescent materials.
Preferably, the step c includes the steps of:
c 1: determining a temperature difference at the two fluorescent materials based on the two long wavelength fluorescent, optoelectronic modules, and the data processing module;
c 2: determining the mass flow rate of the fluid in the fluid pipe based on the King's law.
Preferably, the formula law is: p/Δ T ═ a + B × Q, where P is the power or heat consumed, Δ T is the upstream and downstream temperature difference, Q is the mass flow rate, and a and B are constants.
The invention aims to solve the technical problem of providing an optical fiber flowmeter based on a fluorescence method aiming at the defects of a thermal mass flowmeter pointed out in the background technology. The principle is that the afterglow life of fluorescence is only monotonous related to the temperature, the temperature of the position of a fluorescent material can be obtained by detecting the afterglow life of the fluorescence, and the mass flow of the fluid can be obtained by measuring the fluorescence temperature difference of the upstream and downstream positions of the fluid. The optical fiber flowmeter based on the fluorescence method comprises a fluorescent material, an optical probe, a photoelectric module and a data processing module. The optical probe is used for detecting optical signals of the fluorescent material and transmitting the optical signals to the photoelectric module through an optical fiber; the photoelectric module converts the received optical signal into an electric signal and sends the electric signal to the data processing module; the data processing module converts the received electric signals into temperature signals, obtains the temperature difference between the upstream and the downstream, calculates the mass flow of the fluid and transmits the information to the upper computer. The measuring method comprises the steps of heating the fluorescent material, measuring the temperature of the fluorescent material by using a fluorescence method, acquiring temperature difference after data acquisition, and calculating to obtain the mass flow of the fluid. The heating of the fluorescent material may be by laser, infrared light or heating wire/plate. The fluorescence method is preferably used for measuring the temperature.
Compared with the existing thermal flowmeter, the invention separates the heating element and the temperature measuring element without heat conduction, and can more accurately measure the mass flow of the fluid. The probe part is an all-optical system, has no current, no electromagnetic noise, high thermal stability, no aging phenomenon of a hot wire, no interference of external electromagnetic noise, high voltage resistance, corrosion resistance and capability of working under strong electromagnetic interference and severe chemical environment. The adopted optical probe and the fluorescent material can be very small in geometric dimension, the corresponding heat capacity is also very small, the measurement responsivity is high, and the miniaturization and the integration are facilitated. The invention has simple structure, convenient use, accurate measurement and extremely high commercial value.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 shows a schematic connection diagram of a fiber optic flow meter with fluorescent material, according to an embodiment of the present invention;
FIG. 2 shows a schematic connection diagram of a fiber optic flow meter with fluorescent material according to a first embodiment of the present invention;
FIG. 3 shows a schematic flow chart of a method for controlling a fiber optic flow meter having a fluorescent material, according to another embodiment of the present invention; and
fig. 4 shows a specific flow chart for determining the mass flow rate of the fluid in the fluid pipe based on two long wavelength fluorescence according to the second embodiment of the present invention.
Detailed Description
In order to better and clearly show the technical scheme of the invention, the invention is further described with reference to the attached drawings.
Fig. 1 is a schematic diagram showing a structural connection of an optical fiber flowmeter with a fluorescent material according to an embodiment of the present invention, and fig. 2 is a schematic diagram showing a structural connection of an optical fiber flowmeter with a fluorescent material according to a first embodiment of the present invention, which will be further described with reference to fig. 1 and 2 for better describing the connection, structure, shape, material, and the like of the components of the present invention in detail.
The invention discloses an optical fiber flowmeter with fluorescent materials, which is used for determining the mass flow rate of fluid in a fluid pipe, the measuring method of the invention is to heat the fluorescent materials firstly, then measure the temperature of the fluorescent materials by fluorescence, obtain the temperature difference after data acquisition and obtain the mass flow rate of the fluid after calculation processing, the measuring method comprises two fluorescent materials 1 which are arranged at intervals and are used for emitting long-wavelength fluorescence, the fluorescent materials 1 can emit long-wavelength fluorescence after being irradiated by exciting light, in the invention, two fluorescent materials 1 are preferably arranged, the two fluorescent materials 1 are arranged at intervals, as shown in fig. 1 and fig. 2, and the two fluorescent materials 1 are arranged on the outer wall of the fluid pipe 4.
Further, the present invention further includes two optical fibers 3 disposed at intervals between two fluorescent materials 1, respectively, for transmitting light, in such an embodiment, one fluorescent material 1 corresponds to one optical fiber 3, as shown in fig. 1 and 2, and two fluorescent materials 1 and optical fibers 3 corresponding to each other are disposed at intervals.
Further, the present invention further includes a photovoltaic module 5 connected to the two optical fibers 3, for emitting a high energy light beam and receiving an optical signal from the optical fibers 3 and converting the optical signal into an electrical signal, the two optical fibers 3 disposed at an interval are connected to the same photovoltaic module 5, and the photovoltaic module has two functions, one is to heat the fluorescent material in the detection stage, and generate a high energy light beam to irradiate the fluorescent material through the optical fibers, so that the fluorescent material is heated, and the other is to perform photoelectric conversion, that is, after the fluorescent light emits long wavelength fluorescent light, the fluorescent light is received by the photovoltaic module 5 through the optical fibers, and further, the photovoltaic module 5 converts the optical signal into the electrical signal.
The optoelectronic module 5 further includes a light source, the light source 51 is disposed on the optoelectronic module 5, and is used as an excitation light source and emits a high-energy light beam, the light source disposed in the optoelectronic module is used as an excitation light source for a fluorescent temperature sensing material, and also can be used for heating the fluorescent material, and the light source can be L ED or laser L D.
Further, the present invention further comprises an upper computer 7 connected to the optoelectronic module 5, and configured to determine and store the mass flow rate of the fluid, in such an embodiment, the upper computer 7 is configured to calculate and determine the mass flow rate of the fluid, and store the final calculation result.
The skilled person understands that two spaced fluorescent materials 1 are respectively attached to an outer tube wall of a fluid tube 4, and the two spaced fluorescent materials 1 may be fixed to the outer tube wall of the fluid tube 4 by bonding, binding, clamping, and the like. In the non-operating state of the fluid pipe 4, the fluid in the fluid pipe 4 is at rest or is empty, and in the operating state, as shown in fig. 1 and fig. 2, the fluid in the fluid pipe 4 moves from left to right.
The optical fiber flowmeter with fluorescent material is realized by the components, but as a preferred embodiment of the invention, in addition to the components, the optical fiber flowmeter also comprises an optical probe 2, and in the working state, the optical probe 2 is used for detecting the optical signal of the fluorescent material and transmitting the optical signal to the photoelectric module 5 through the optical fiber 3.
As a preferred variation of the above embodiment, the optical probe further includes an optical lens 21, the optical lens 21 is disposed on the optical probe and is used for converging the light beam onto the fluorescent material, and the optical probe 2 includes an optical lens for better converging the light energy for heating the fluorescent material 1 onto the fluorescent material 1, so as to complete the heating process more quickly, and also improve the efficiency of coupling the fluorescence emitted from the fluorescent material 1 into the optical fiber 3, and improve the signal-to-noise ratio of the detection signal of the optoelectronic module.
The optical fiber flowmeter with the fluorescent material is realized by the components, but as another preferred embodiment of the invention, the optical fiber flowmeter further comprises a data processing module 6, wherein the data processing module 6 is respectively connected with the photoelectric module 5 and the upper computer 7 and is used for converting the electric signal into a temperature signal and calculating the mass flow of the fluid, the photoelectric module 5 transmits the electric signal to the data processing module 6, the data processing module 6 converts the electric signal into the temperature signal and determines the mass flow of the fluid based on the gold law, namely in such an embodiment, the data processing module 6 can also play a role of determining the mass flow of the fluid by the determination and calculation of the upper computer in the above specific embodiment, so as to replace the calculation of the upper computer and transmit the calculation result to the upper computer, and the upper computer further stores the calculation result.
The invention realizes the optical fiber flowmeter with the fluorescent material by the components, but as another preferred embodiment of the invention, the invention also comprises a heater 8 which is arranged on the outer tube wall of the fluid tube and is used for heating the fluorescent material, and in such an embodiment, the heater 8 replaces the function of generating high-energy light beams by the photoelectric module 5 and irradiating the high-energy light beams on the fluorescent material through the optical fibers to heat the fluorescent material.
With the above embodiment, the optoelectronic module emits pulse-type short-wavelength light to excite the fluorescent material 1 to emit long-wavelength fluorescence, the fluorescence passes through the optical probe 2, the optical fiber 3 is received by the optoelectronic module 5 and converted into an electrical signal to be transmitted to the data processing module 6, the data processing module 6 converts the received electrical signal into a temperature signal to obtain a temperature difference between the two temperature signals, calculates the fluid flow rate, and transmits the information to the upper computer 7.
The upper computer 7 and the data processing module 6 are connected in a limited cable mode and a wireless cable mode, and the connection with the upper computer can be in a wired cable mode or a wireless communication mode. The communication mode of the wired cable can be selected from RS232, RS485, USB and the like. The wireless communication mode can be selected from Bluetooth, WiFi and the like.
Fig. 3 is a schematic flow chart showing a control method of a fiber optic flowmeter with fluorescent material according to another embodiment of the invention, which uses the control device shown in fig. 1 and 2 to determine the mass flow rate of the fluid in the fluid pipe,
more specifically, fig. 3 will be further described with reference to fig. 4, where fig. 4 shows a specific flow chart of determining the mass flow rate of the fluid in the fluid pipe based on two long wavelength fluorescence according to a second embodiment of the present invention, and specifically, fig. 3 includes the following steps:
first, step S101 is performed to heat two fluorescent materials attached to the outer tube wall of the fluid tube, and those skilled in the art will understand that the present invention can be applied to the fluorescent materials in three ways, including but not limited to a high-energy light beam emitted from the photovoltaic module, a heater, or a thermal fluid disposed between the fluorescent materials.
Then, step S102 is entered, and two long-wavelength fluorescence is emitted based on the excitation of the two fluorescent materials by the photovoltaic module, in such an embodiment, the photovoltaic module is provided with a light source capable of emitting pulsed short-wavelength light to the two fluorescent materials, so as to excite the two fluorescent materials to emit two long-wavelength fluorescence.
And finally, step S103 is performed, the mass flow rate of the fluid in the fluid pipe is determined based on the two long-wavelength fluorescence, after step S102, the photoelectric module emits pulse-type short-wavelength light to excite the fluorescent material 1 to emit long-wavelength fluorescence, the fluorescence passes through the optical probe 2, the optical fiber 3 is received by the photoelectric module and converted into an electrical signal to be transmitted to the data processing module, the data processing module converts the received electrical signal into a temperature signal, and obtains a temperature difference between the two positions, and the fluid flow rate is calculated.
With reference to fig. 4, in step S1031, the temperature difference at the two fluorescent materials is determined based on the two long wavelength fluorescence, photoelectric modules and data processing modules, and in step S1032, the mass flow rate of the fluid in the fluid pipe is determined based on the law of kindred' S law: p/Δ T ═ a + B × Q, where P is the power or heat consumed, Δ T is the upstream and downstream temperature difference, Q is the mass flow rate, and a and B are constants.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention.
Claims (11)
1. A fiber optic flow meter having a fluorescent material for determining the mass flow rate of a fluid in a fluid conduit, comprising:
two spaced fluorescent materials (1) for emitting long wavelength fluorescence;
two optical fibers (3) respectively arranged at intervals of the two fluorescent materials (1) and used for transmitting light sources;
the photoelectric module (5) is connected with the two optical fibers (3) and is used for emitting high-energy light beams and receiving optical signals from the optical fibers (3) and converting the optical signals into electric signals;
the upper computer (7) is connected with the photoelectric module (5) and is used for determining and storing the mass flow of the fluid; wherein,
the two fluorescent materials (1) arranged at intervals are respectively attached to the outer tube wall of a fluid tube (4).
2. Optical fiber flowmeter according to claim 1, further comprising an optical probe (2), wherein in an operational state, the optical probe (2) is adapted to detect optical signals of fluorescent material and to transmit them to the optoelectronic module (5) via the optical fiber (3).
3. The optical fiber flowmeter according to claim 1, further comprising a data processing module (6), wherein the data processing module (6) is respectively connected to the optoelectronic module (5) and the upper computer (7), and is configured to convert the electrical signal into a temperature signal and calculate a mass flow of the fluid.
4. The optical fiber flow meter according to claim 1, further comprising a heater (8) disposed on an outer tube wall of the fluid tube for heating the fluorescent material.
5. The fiber optic flow meter of claim 1, further comprising an optical lens (21), the optical lens (21) being disposed on the optical probe (2) for focusing the light beam onto the fluorescent material.
6. The fiber optic flow meter of claim 1, further comprising a light source, said light source (51) being disposed on said optoelectronic module (5) and serving as an excitation light source and emitting a high energy beam.
7. Optical fiber flowmeter according to claim 1, characterized in that the connection between the upper computer (7) and the data processing module (6) is in the following way:
-a limited cable mode;
wireless cable mode.
8. A method of controlling a fiber optic flow meter having a fluorescent material to determine the mass flow rate of a fluid in a fluid conduit using a control device according to any of claims 1-7, comprising the steps of:
a: heating two fluorescent materials attached to the outer tube wall of the fluid tube;
b: exciting the two fluorescent materials to emit two long-wavelength fluorescent lights based on the optoelectronic module;
c: determining a mass flow rate of fluid within the fluid tube based on the two long wavelength fluorescences.
9. The control method according to claim 8, wherein in the step a, the heating of the fluorescent material is achieved by:
-a high-energy light beam emitted by the photovoltaic module;
-a heater; or
-a thermal fluid arranged between the fluorescent materials.
10. The control method according to claim 8, wherein the step c includes the steps of:
c 1: determining a temperature difference at the two fluorescent materials based on the two long wavelength fluorescent, optoelectronic modules, and the data processing module;
c 2: determining the mass flow rate of the fluid in the fluid pipe based on the King's law.
11. The control method according to claim 10, wherein the golden law is: p/Δ T ═ a + B × Q, where P is the power or heat consumed, Δ T is the upstream and downstream temperature difference, Q is the mass flow rate, and a and B are constants.
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| CN202010338302.5A CN111486913A (en) | 2020-04-26 | 2020-04-26 | Optical fiber flowmeter with fluorescent material and control method |
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| CN202010338302.5A CN111486913A (en) | 2020-04-26 | 2020-04-26 | Optical fiber flowmeter with fluorescent material and control method |
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