CN115265680A - Differential pressure type fiber grating flow sensor for low starting flow - Google Patents

Differential pressure type fiber grating flow sensor for low starting flow Download PDF

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Publication number
CN115265680A
CN115265680A CN202210885888.6A CN202210885888A CN115265680A CN 115265680 A CN115265680 A CN 115265680A CN 202210885888 A CN202210885888 A CN 202210885888A CN 115265680 A CN115265680 A CN 115265680A
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grating
optical fiber
pressure
pressure taking
hole
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CN202210885888.6A
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Inventor
乔学光
王博
白燕
高宏
张栋宇
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Xian Shiyou University
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Xian Shiyou University
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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
    • G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
    • G01F1/34—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
    • G01F1/36—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction
    • G01F1/38—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction the pressure or differential pressure being measured by means of a movable element, e.g. diaphragm, piston, Bourdon tube or flexible capsule
    • 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
    • G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
    • G01F1/34—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
    • G01F1/50—Correcting or compensating means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
    • G01F15/02—Compensating or correcting for variations in pressure, density or temperature
    • G01F15/028—Compensating or correcting for variations in pressure, density or temperature for low flow rates
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
    • G01F15/18—Supports or connecting means for meters
    • G01F15/185—Connecting means, e.g. bypass conduits
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
    • G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
    • G01K11/3206—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres at discrete locations in the fibre, e.g. using Bragg scattering

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Measuring Fluid Pressure (AREA)

Abstract

The utility model provides a be used for low differential fiber grating flow sensor that starts flow, can dismantle between first trunk line and the second trunk line and be connected with the nozzle, the tip of first trunk line and second trunk line all is provided with the joint, processing has first pressure taking hole on the first trunk line lateral wall, be provided with first straight tube cutting ferrule on the first pressure taking hole, first straight tube cutting ferrule is linked together with sensing component through the steel pipe way subassembly, processing has the second to get the pressure hole on the second trunk line lateral wall, the second is got pressure hole aperture and is the same with first pressure taking hole, be provided with second straight tube cutting ferrule on the second pressure taking hole, second straight tube cutting ferrule supports through pipe assembly and is connected with sensing component and is linked together with sensing component. The invention adopts the double fiber grating structure to carry out temperature compensation, eliminates the problem of cross sensitivity of temperature strain, obviously improves the sensitivity by combining the double fiber grating structure with a differential pressure type sensing structure, meets the measurement requirement of small flow, and has the advantages of low starting flow, quick response, corrosion resistance and the like.

Description

Differential pressure type fiber grating flow sensor for low starting flow
Technical Field
The invention belongs to the technical field of measurement or testing, and particularly relates to a fiber grating flow sensor.
Background
The flow rate is used as an important index parameter in modern industrial production, and accurate measurement of flow rate data is crucial to improving industrial productivity. Although the traditional electrical flowmeter is widely used, the traditional electrical flowmeter has certain limitations, such as higher starting flow, incapability of measuring high-temperature and high-pressure fluid, easiness in being influenced by external electromagnetic interference and the like; compared with the traditional electrical flow sensor, the fiber bragg grating flow sensor has the advantages of electromagnetic interference resistance, low loss, high temperature and pressure resistance and corrosion resistance, and is more suitable for parameter measurement in severe environments. The differential pressure type flow sensor based on the Bragg grating has the advantages that when fluid passes through the throttling element, differential pressure can be generated around the throttling element, the differential pressure is transmitted to the pressure tapping pipe through the pressure tapping hole and acts on the metal diaphragm, the metal diaphragm deforms, the central wavelength of the Bragg grating attached to the metal diaphragm changes, and the purpose of measuring flow is achieved.
Chinese patent publication No. CN202648714U discloses a "micro-diameter high-pressure nozzle flow device based on fiber bragg grating differential pressure sensing", which adopts a diaphragm fixed at one end of a pressure taking cavity and connected by threads, and this fixing mode has some problems. For example, the two-end pressure taking cavity is easy to drive the grating in the rotating process, so that the fiber grating is damaged; the fiber grating sensor is fixed on one side of the alloy diaphragm, does not have the function of temperature compensation, is low in sensitivity due to temperature influence and inaccurate in measurement, and is only suitable for high-pressure flow measurement; the nozzle of the device is fixed in the hexagonal thick-wall pipe, and the range is fixed and can not be changed.
Chinese patent publication No. CN102095451A entitled "fiber grating liquid flow sensor with temperature compensation" discloses that fiber gratings are adhered to both sides of an elastic tongue, and the elastic tongue is directly placed in a liquid pipeline for measurement, which is a target-type flow sensor, and the elastic tongue is directly driven to deform only by the impact of fluid on one side. And because of the difference between the diaphragm type and the spring tongue type structures, the dual-gate temperature compensation of the diaphragm type structure is more difficult to realize than the spring tongue type structure, which is also the reason that the dual-gate temperature compensation is not carried out on the traditional pressure difference type diaphragm type structure.
At present, a fiber grating flow sensor with high sensitivity and high accuracy suitable for low-start flow measurement is urgently needed.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides the differential pressure type diaphragm fiber bragg grating flow sensor for low starting flow, which has the advantages of reasonable design, compact structure, high sensitivity, high measuring accuracy, replaceable measuring range and long service life.
The technical scheme for solving the technical problems is as follows: a differential pressure type fiber bragg grating flow sensor for low starting flow is characterized in that a nozzle is detachably connected between a first main pipeline and a second main pipeline, joints are arranged at the end parts of the first main pipeline and the second main pipeline, a first pressure tapping hole is machined in the side wall of the first main pipeline 1, a first straight pipe clamping sleeve is arranged on the first pressure tapping hole, the first straight pipe clamping sleeve is communicated with a sensing assembly through a steel pipeline assembly, a second pressure tapping hole is machined in the side wall of the second main pipeline, the diameter of the second pressure tapping hole is the same as that of the first pressure tapping hole, a second straight pipe clamping sleeve is arranged on the second pressure tapping hole, and the second straight pipe clamping sleeve is connected with the sensing assembly through a pipeline assembly support and is communicated with the sensing assembly; the sensing assembly is characterized in that an annular mounting seat is in threaded connection between a first sealing cover and a second sealing cover, a metal diaphragm and an annular gasket are arranged in the middle of one side of the annular mounting seat from inside to outside, the metal diaphragm divides a cavity formed by the first sealing cover, the second sealing cover and the annular mounting seat into a first pressure taking cavity and a second pressure taking cavity which are independent and have the same volume, the first pressure taking cavity is communicated with a first pressure taking hole a, the second pressure taking cavity is communicated with a second pressure taking hole, a first optical fiber mounting hole is radially processed in the annular mounting seat on one side of the metal diaphragm, a first optical fiber is mounted in the first optical fiber mounting hole, a first grating is engraved on the first optical fiber, the part of the first optical fiber for engraving the first grating is sealed on one side surface of the metal diaphragm through high-temperature glue, a second optical fiber mounting hole is radially processed in the annular mounting seat on the other side of the metal diaphragm, a second optical fiber is mounted in the second optical fiber mounting hole, a second optical fiber is engraved on the second optical fiber, and the part of the second optical fiber for engraving the second grating is sealed on the other side surface of the metal diaphragm through high-temperature glue.
As a preferable technical scheme, the aperture of the first pressure taking hole is 2-6 mm.
As a preferred technical scheme, an annular boss is processed on the inner wall of the middle part of the annular mounting seat, a metal diaphragm and an annular gasket are sequentially arranged on one side face of the annular boss from inside to outside, the metal diaphragm is adhered to the side face of the annular boss by using glue, two symmetrical positioning holes are processed on one side face of the boss adhered to the metal diaphragm, two positioning columns matched with the positioning holes are processed on the annular gasket, and the positioning columns are positioned in the positioning holes; and internal threads are processed on two sides of the annular boss of the annular mounting seat and are used for being connected with the first sealing cover and the second sealing cover.
As a preferred technical solution, the lengths of the gate regions of the first grating and the second grating are the same, and the central wavelengths are not equal.
As a preferable technical scheme, the thickness of the metal diaphragm is 0.3-0.5 mm, and the material is copper or stainless steel.
As a preferred technical scheme, the nozzle is an ISA1932 standard nozzle.
As a preferred technical scheme, the pipeline component is characterized in that connecting pipes are connected to two ends of a bent pipe clamping sleeve.
As a preferred technical scheme, the nozzle is connected with the first main pipeline and the second main pipeline through flanges.
The invention has the following beneficial effects:
the invention adopts a threaded connection annular mounting seat between a first sealing cover and a second sealing cover, a metal diaphragm and an annular gasket are arranged in the middle of one side of the annular mounting seat from inside to outside, the metal diaphragm divides a cavity formed by the first sealing cover, the second sealing cover and the annular mounting seat into a first pressure taking cavity and a second pressure taking cavity which are independent and have the same volume, a first optical fiber and a second optical fiber are arranged on the annular mounting seats on two sides of the metal diaphragm, the part of the first optical fiber for writing the first grating is sealed on one side surface of the metal diaphragm through high-temperature glue, the part of the second optical fiber for writing the second grating is sealed on the other side surface of the metal diaphragm through high-temperature glue, the metal diaphragm is isolated from the first sealing cover through the annular gasket, the annular mounting seat enables the optical fiber grating not to directly contact the sealing covers, the problem that the optical fiber grating is damaged due to rotation in the mounting process is avoided, the threaded connection between the annular mounting seat and the first sealing cover and the second sealing cover is convenient for the packaging of the optical fiber grating, and the defect that the double optical fiber grating can not be packaged because the fixed covers in the micro-diameter high-pressure nozzle flow device based on the micro differential sensing of the optical fiber grating in the prior art is overcome.
The invention adopts the double fiber grating structure to carry out temperature compensation, eliminates the cross sensitivity problem of temperature strain, obviously improves the sensitivity by combining the double fiber grating structure with the differential pressure type sensing structure, and meets the measurement requirement of small flow. The invention is suitable for complex oil and gas underground test requirements, has the advantages of low starting flow, quick response, corrosion resistance and the like, and realizes the real-time monitoring of the oil and gas underground low starting fluid flow.
Drawings
FIG. 1 is a schematic diagram of the present invention.
Fig. 2 is a schematic view of the installation of the first optical fiber 8 of the present invention.
Fig. 3 is a schematic illustration of the installation of the second optical fiber 10 of the present invention.
Wherein: a first main pipe 1; a first straight pipe clamp sleeve 2; a pipe assembly 3; a first seal cover 4; an annular mounting seat 5; an annular gasket 6; a metal diaphragm 7; a first optical fiber 8; a second sealing cover 9; a second optical fiber 10; a second straight pipe cutting sleeve 11; a second main conduit 12; a nozzle 13; a joint 14; a first grating 15; a second grating 16; a first pressure tapping hole a; a second pressure tapping hole b;
Detailed Description
The present invention will be described in further detail below with reference to the drawings and examples, but the present invention is not limited to the embodiments described below.
Example 1
In fig. 1, 2, 3, the one kind of be used for low start-up flow differential fiber grating flow sensor of this embodiment is for having nozzle 13 through flange joint between first trunk line 1 and the second trunk line 12, realize the change of range through changing not unidimensional nozzle 13, nozzle 13 of this embodiment is ISA1932 standard nozzle, nozzle 13 throat diameter is 15.516mm, the diameter ratio is 0.597, the tip of first trunk line 1 and second trunk line 12 all is provided with joint 14, be used for linking to each other with the pipeline under test, processing has first pressure taking hole a on the first trunk line 1 lateral wall, the aperture of first pressure taking hole a is 4mm, first straight tube cutting ferrule 2 has been welded on first pressure taking hole a, first straight tube cutting ferrule 2 is linked together with the sensing component through steel pipeline subassembly 3, processing has second pressure taking hole b on the second trunk line 12 lateral wall, second pressure taking hole b aperture is the same with first pressure taking hole a, the welding has second straight tube cutting ferrule 11 on second pressure taking hole b, second straight tube cutting ferrule 11 is connected with the other end through pipeline subassembly 3 and is linked together with the sensing component.
The sensing component of the embodiment is that an annular mounting seat 5 is in threaded connection between a first sealing cover 4 and a second sealing cover 9, an annular boss is processed on the inner wall of the middle part of the annular mounting seat 5, a metal diaphragm 7 and an annular gasket 6 are sequentially arranged on the left side surface of the annular boss from inside to outside, the annular gasket 6 is used for protecting the metal diaphragm 7, the metal diaphragm 7 is 0.4mm thick and made of copper, the metal diaphragm 7 is adhered to the side surface of the annular boss by using glue, two symmetrical positioning holes are processed on one side surface of the boss adhered to the metal diaphragm 7, two positioning columns matched with the positioning holes are processed on the annular gasket 6 and positioned in the positioning holes, internal threads are processed on two sides of the annular boss of the annular mounting seat 5 and used for being connected with the first sealing cover 4 and the second sealing cover 9, the metal diaphragm 7 divides a cavity formed by the first sealing cover 4, the second sealing cover 9 and the annular mounting seat 5 into a first pressure taking cavity and a second pressure taking cavity which are independent and have the same volume, the first pressure taking cavity is communicated with the first pressure taking hole a, the second pressure taking cavity is communicated with the second pressure taking hole b, a first optical fiber mounting hole is radially processed on an annular mounting seat 5 on one side of the metal diaphragm 7, a first optical fiber 8 is mounted in the first optical fiber mounting hole, a first grating 15 is engraved on the first optical fiber 8, the length of a grating area of the first grating 15 is 5mm, the central wavelength is 1531.906nm, the part of the first optical fiber 8 engraved with the first grating 15 is sealed on one side face of the metal diaphragm 7 through high-temperature glue, a second optical fiber mounting hole is radially processed on the annular mounting seat 5 on the other side of the metal diaphragm 7, a second optical fiber 10 is mounted in the second optical fiber mounting hole, a second grating 16 is engraved on the second optical fiber 10, the length of the grating area of the second grating 16 is 5mm, the central wavelength is 1538.017nm, the part of the second optical fiber 10 engraved with the second grating 16 is sealed on the side face of the metal diaphragm 7 through high-temperature glue, the first optical fiber mounting hole and the second optical fiber mounting hole are sealed through high-temperature glue.
The pipe assembly 3 of this embodiment is connected with the connecting pipe for return bend cutting ferrule both ends.
The working principle of the embodiment is as follows:
the invention is arranged on a measured pipeline, fluid in the pipeline passes through a nozzle 13 between a first main pipeline 1 and a second main pipeline 12, so that pressure difference is formed between the fluid entering a first pressure taking hole a and a second pressure taking hole b, the fluid entering from the first pressure taking hole a enters a first pressure taking cavity through the pipeline and acts on a metal diaphragm 7, the fluid entering from the second pressure taking hole b enters a second pressure taking cavity through the pipeline and acts on the metal diaphragm 7, the metal diaphragm 7 deforms, further, the central wavelengths of a first grating 15 and a second grating 16 drift, the fluid flow is measured in a differential mode, and the difference delta lambda between the drift amounts of the central wavelengths of the first grating 15 and the second grating 16 is measured21And the measured volume flow QvThe relationship between them is:
Figure BDA0003765647230000071
in the formula, A0The smallest diameter end area, A, of the nozzle 130=15.5mm, β is the throat diameter ratio of the nozzle 13, β =0.597, t is the thickness of the metal diaphragm 7, t =0.4mm, E is the young modulus of the diaphragm material, E =2 × 1011PaV is the Poisson's ratio, v =0.32,PeIs the effective elasto-optic coefficient, P, of the optical fibereK is a constant equivalent to 0.22, which is introduced by the average strain experienced by the fiber grating.
The invention eliminates the cross sensitivity problem of temperature strain and improves the sensitivity.
Example 2
In this embodiment, there is nozzle 13 through flange connection between first trunk line 1 and the second trunk line 12, nozzle 13 throat diameter is 18.576mm, the diameter ratio is 0.599, processing has first pressure taking hole an on the 1 lateral wall of first trunk line, the aperture of first pressure taking hole a is 2mm, processing has second pressure taking hole b on the 12 lateral walls of second trunk line, second pressure taking hole b aperture is the same with first pressure taking hole a, the welding has first straight tube cutting ferrule 2 on the first pressure taking hole a, first straight tube cutting ferrule 2 is linked together with sensing assembly through steel pipeline subassembly 3, processing has second pressure taking hole b on the 12 lateral walls of second trunk line, second pressure taking hole b aperture is the same with first pressure taking hole a, the welding has second straight tube 11 on the second pressure taking hole cutting ferrule b, second straight tube 11 supports through pipeline subassembly 3 and is connected with sensing assembly and is linked together with the sensing assembly other end. Sensing component is that threaded connection has annular mount pad 5 between first sealed lid 4 and the sealed 9 of second, and the processing of 5 middle part inner walls of annular mount pad has annular boss, and annular boss left surface has set gradually metallic diaphragm 7, annular gasket 6 from inside to outside, and annular gasket 6 is used for protecting metallic diaphragm 7, and metallic diaphragm 7's thickness is 0.3mm, and the material is 304 stainless steel. The other components and the connection relationship of the components are the same as those in embodiment 1.
Example 3
In this embodiment, there is nozzle 13 through flange connection between first trunk line 1 and the second trunk line 12, nozzle 13 throat diameter is 21.526mm, the diameter ratio is 0.598, processing has first pressure taking hole an on the 1 lateral wall of first trunk line, the aperture of first pressure taking hole a is 6mm, processing has second pressure taking hole b on the 12 lateral walls of second trunk line, second pressure taking hole b aperture is the same with first pressure taking hole a, the welding has first straight tube cutting ferrule 2 on the first pressure taking hole a, first straight tube cutting ferrule 2 is linked together with sensing assembly through steel pipeline subassembly 3, processing has second pressure taking hole b on the 12 lateral walls of second trunk line, second pressure taking hole b aperture is the same with first pressure taking hole a, the welding has second straight tube 11 on the second pressure taking cutting ferrule b, second straight tube 11 supports through pipeline subassembly 3 and is connected with sensing assembly and is linked together with the sensing assembly other end. Sensing component is threaded connection has annular mount pad 5 between first sealed lid 4 and the sealed lid 9 of second, and annular mount pad 5 middle part inner wall processing has annular boss, and annular boss left surface has set gradually metallic diaphragm 7, annular gasket 6 from inside to outside, and annular gasket 6 is used for protecting metallic diaphragm 7, and metallic diaphragm 7's thickness is 0.5mm, and the material is 304 stainless steel. The other components and the connection relationship of the components are the same as those in embodiment 1.

Claims (8)

1. A differential pressure type fiber bragg grating flow sensor for low starting flow is characterized in that a nozzle is detachably connected between a first main pipeline and a second main pipeline, joints are arranged at the end parts of the first main pipeline and the second main pipeline, a first pressure taking hole is processed on the side wall of the first main pipeline 1, a first straight pipe clamping sleeve is arranged on the first pressure taking hole and communicated with a sensing assembly through a steel pipeline assembly, a second pressure taking hole is processed on the side wall of the second main pipeline, the aperture of the second pressure taking hole is the same as that of the first pressure taking hole, a second straight pipe clamping sleeve is arranged on the second pressure taking hole, and the second straight pipe clamping sleeve is connected with the sensing assembly through a pipeline assembly support and communicated with the sensing assembly; the sensing assembly is characterized in that an annular mounting seat is in threaded connection between a first sealing cover and a second sealing cover, a metal diaphragm and an annular gasket are arranged in the middle of one side of the annular mounting seat from inside to outside, the metal diaphragm divides a cavity formed by the first sealing cover, the second sealing cover and the annular mounting seat into a first pressure taking cavity and a second pressure taking cavity which are independent and have the same volume, the first pressure taking cavity is communicated with a first pressure taking hole a, the second pressure taking cavity is communicated with a second pressure taking hole, a first optical fiber mounting hole is radially processed in the annular mounting seat on one side of the metal diaphragm, a first optical fiber is mounted in the first optical fiber mounting hole, a first grating is engraved on the first optical fiber, the part of the first optical fiber for engraving the first grating is sealed on one side surface of the metal diaphragm through high-temperature glue, a second optical fiber mounting hole is radially processed in the annular mounting seat on the other side of the metal diaphragm, a second optical fiber is mounted in the second optical fiber mounting hole, a second optical fiber is engraved on the second optical fiber, and the part of the second optical fiber for engraving the second grating is sealed on the other side surface of the metal diaphragm through high-temperature glue.
2. The differential pressure fiber grating flow sensor for low start-up flow of claim 1, wherein the first pressure tapping hole has an aperture of 2-6 mm.
3. The differential pressure type fiber bragg grating flow sensor for the low starting flow according to claim 1, wherein an annular boss is processed on the inner wall of the middle part of the annular mounting seat, a metal diaphragm and an annular gasket are sequentially arranged on one side surface of the annular boss from inside to outside, the metal diaphragm is adhered to the side surface of the annular boss by glue, two symmetrical positioning holes are processed on one side surface of the boss, which is adhered to the metal diaphragm, two positioning columns matched with the positioning holes are processed on the annular gasket, and the positioning columns are positioned in the positioning holes; and internal threads are processed on two sides of the annular boss of the annular mounting seat and are used for being connected with the first sealing cover and the second sealing cover.
4. The differential pressure fiber grating flow sensor as in claim 1, wherein the first grating and the second grating have the same grating region length and unequal center wavelength.
5. The differential pressure type fiber bragg grating flow sensor for the low start-up flow according to claim 1, wherein the metal diaphragm is 0.3 to 0.5mm thick and made of copper or stainless steel.
6. The differential pressure fiber grating flow sensor for low actuation flow rate of claim 1, wherein the nozzle is ISA1932 standard nozzle.
7. The differential pressure fiber grating flow sensor with low start-up flow rate of claim 1, wherein the pipe assembly is a bent pipe ferrule with connecting pipes connected to both ends.
8. The differential pressure type fiber bragg grating flow sensor for the low starting flow rate as claimed in claim 1, wherein the nozzle is connected with the first main pipe and the second main pipe through flanges.
CN202210885888.6A 2022-07-26 2022-07-26 Differential pressure type fiber grating flow sensor for low starting flow Pending CN115265680A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210885888.6A CN115265680A (en) 2022-07-26 2022-07-26 Differential pressure type fiber grating flow sensor for low starting flow

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Application Number Priority Date Filing Date Title
CN202210885888.6A CN115265680A (en) 2022-07-26 2022-07-26 Differential pressure type fiber grating flow sensor for low starting flow

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