CN104266789B - Based on the method for sensing of the fluid pressure differential that the magnetic drives differential pressure pick-up of fiber grating realizes - Google Patents
Based on the method for sensing of the fluid pressure differential that the magnetic drives differential pressure pick-up of fiber grating realizes Download PDFInfo
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Abstract
Based on the method for sensing of the fluid pressure differential that the magnetic drives differential pressure pick-up of fiber grating realizes, belong to fiber grating strain sensor technical field.Solve existing pressure difference sensing method and there is the high problem of the malfunctioning risk of sensing functionality.Height on pipeline, the hydraulic pressure difference that the liquid that low pressure hole is flowed out produces acts on high_voltage isolation diaphragm and low pressure isolation diaphragm, make high_voltage isolation diaphragm, low pressure isolation diaphragm produces deformation, and the center that this deformation makes the center that promotes of the high-temperature silicon oil in No. 2 cylinders measure flexible sheet moves axially, center is made to measure flexible sheet generation deformation, and drive No. 1 strong magnet to move, No. 2 strong magnets are made to follow No. 1 strong magnet synchronizing moving, the movement of No. 2 strong magnets makes elastic cantilever beam deflection, make the fiber grating generation deformation with temperature compensation, the signal exported with the fiber grating of temperature compensation delivers to computing machine by (FBG) demodulator, complete the transmission to fluid pressure differential information.The present invention is mainly used in fluid pressure differential sensory field.
Description
Technical field
The present invention relates to a kind of optical fiber differential pressure pickup utilizing isolated strong magnet to drive the fiber grating generation strain of semi-girder surface, belong to fiber grating strain sensor technical field.
Background technology
Differential pressure pick-up is widely used in the industries such as oil, chemical industry, electric power, metallurgy, environmental protection, for measuring the parameter such as differential pressure and flow of liquid, gas, can be used as the core component of process control field differential pressure transmitter.
In many special occasions, fiber grating differential pressure pick-up has the advantages that many traditional differential pressure sensors do not possess.Fiber grating is as the sensor of intelligent structure, have that volume is little, lightweight, corrosion-resistant, anti-electromagnetic interference capability is strong, easy of integration, advantages of simple structure and simple, can bury and overlay on testee and material internal detects physical quantitys such as pressure, temperature, stress, strain, flow velocity, flow, viscosity.
For differential pressure transmitter existing on market, due to shortcomings such as the volume of differential pressure pick-up are large, expensive, anti-electromagnetic interference capability is poor, restriction is constituted to applying of its through engineering approaches; For the environment for use of differential pressure transmitter, may there is functional malfunctioning risk in resistance, capacitance differential pressure transducer under the situations such as strong electromagnetic, deep-etching, intense radiation, high/low temperature, exceedingly odious weather; For the demodulation of fiber grating sensing signal, read and parameter change according to the centre wavelength rreturn value different to fiber grating, and then obtaining the variable quantity treating measurement information, fiber-optic grating sensor is more suitable for the measurement to small differential pressure signal under rugged surroundings in the same circumstances.
Summary of the invention
There is the high problem of the malfunctioning risk of sensing functionality to solve existing pressure difference sensing method in the present invention, the invention provides the method for sensing of the fluid pressure differential that a kind of magnetic drives differential pressure pick-up based on fiber grating realizes.
Based on the method for sensing of the fluid pressure differential that the magnetic drives differential pressure pick-up of fiber grating realizes, the magnetic drives differential pressure pick-up of described fiber grating comprises No. 1 nonmetal cylinder, flexible sheet, No. 1 strong magnet, No. 2 strong magnets, elastic cantilever and the fiber gratings with temperature compensation are measured in No. 2 cylinders, No. 1 overload protecting mechanism, No. 2 overload protecting mechanisms, No. 3 overload protecting mechanisms, No. 4 overload protecting mechanisms, high_voltage isolation diaphragm, low pressure isolation diaphragm, centers;
No. 1 overload protecting mechanism, No. 2 overload protecting mechanisms, No. 3 overload protecting mechanisms, No. 4 overload protecting mechanisms, high_voltage isolation diaphragm, low pressure isolation diaphragm, center measurement flexible sheet and No. 1 strong magnets are all positioned at No. 2 cylinders,
The bottom surface of No. 2 cylinders is provided with highly pressurised liquid entrance, and end face is provided with low-pressure fluid inlet,
No. 1 overload protecting mechanism, No. 2 overload protecting mechanisms and No. 3 overload protecting mechanisms are circular configuration,
No. 1 overload protecting mechanism, No. 2 overload protecting mechanisms and No. 3 overload protecting mechanisms are fixed in No. 2 cylinders along the end face of No. 2 cylinders to the direction of bottom surface successively; and No. 1 overload protecting mechanism, No. 2 overload protecting mechanisms and No. 3 overload protecting mechanisms are equipped with through hole
Low pressure isolation diaphragm is embedded in No. 2 cylinders, and between low-pressure fluid inlet and No. 1 overload protecting mechanism, No. 1 overload protecting mechanism is used for carrying out overload protection to low pressure isolation diaphragm;
High_voltage isolation diaphragm is embedded in No. 2 cylinders, and between highly pressurised liquid entrance and No. 3 overload protecting mechanisms, No. 3 overload protecting mechanisms are used for carrying out overload protection to high_voltage isolation diaphragm;
Flexible sheet is measured between No. 2 overload protecting mechanisms and No. 3 overload protecting mechanisms in center, and the diaphragm edge that flexible sheet is measured at center is fixedly connected with the inwall of No. 2 cylinders,
The central vertical that No. 1 strong magnet measures flexible sheet by rigid rod and center is fixedly connected with; and rigid rod is through the through hole of No. 2 overload protecting mechanisms; No. 4 overload protecting mechanisms are nested in outside rigid rod; be fixedly connected with rigid rod; and No. 4 overload protecting mechanisms are measured between flexible sheet at No. 2 overload protecting mechanisms and center; No. 2 overload protecting mechanisms are used for carrying out overload protection to No. 4 overload protecting mechanisms
No. 1 nonmetal cylinder is vertically embedded in the sidewall of No. 2 cylinders, and between No. 1 overload protecting mechanism and No. 2 overload protecting mechanisms,
No. 2 strong magnets, elastic cantilever and the fiber gratings with temperature compensation are all positioned at No. 1 nonmetal cylinder, one end of elastic cantilever is lifted on the end face of No. 1 nonmetal cylinder, the other end is fixed with No. 2 strong magnets, and No. 2 strong magnets and No. 1 strong magnet opposite sex are oppositely arranged, fiber grating with temperature compensation is pasted on the sidewall of elastic cantilever
The scope of the vertical range between No. 2 strong magnets and No. 1 strong magnet is 3mm to 5mm;
The method for sensing of this fluid pressure differential comprises the steps,
First, the light that wideband light source sends is incident to the fiber grating with temperature compensation through photo-coupler, after reflecting with the fiber grating of temperature compensation, fiber Bragg grating (FBG) demodulator is entered again through photo-coupler, fiber Bragg grating (FBG) demodulator is for recording the wavelength of reflected light, and the result that fiber Bragg grating (FBG) demodulator exports shows on computers and stores;
Secondly, high-temperature silicon oil is filled with in No. 2 cylinders, the high-temperature silicon oil in cylinder is made to level off to full state, finally, open two holes in liquid stream on the pipeline in direction, first hole of liquid stream warp is pressure hole, second hole of liquid stream warp is low pressure hole, be communicated with the highly pressurised liquid entrance of No. 2 cylinders by pressure hole on pipeline, the low pressure hole on pipeline is communicated with the low-pressure fluid inlet of No. 2 cylinders
The hydraulic pressure difference that the liquid that high and low pressure hole on pipeline is flowed out produces acts on high_voltage isolation diaphragm and low pressure isolation diaphragm, high_voltage isolation diaphragm, low pressure isolation diaphragm is made to produce deformation, and the center that this deformation makes the center that promotes of the high-temperature silicon oil in No. 2 cylinders measure flexible sheet moves axially, center is made to measure flexible sheet generation deformation, and drive No. 1 strong magnet to move, because of No. 1 strong magnet and No. 2 strong magnets, there is a natural attraction between the sexes, makes No. 2 strong magnets follow No. 1 strong magnet synchronizing moving
The movement of No. 2 strong magnets makes elastic cantilever beam deflection, and make the fiber grating generation deformation with temperature compensation, the signal that the fiber grating with temperature compensation exports delivers to computing machine by (FBG) demodulator, completes the transmission to fluid pressure differential information.
The beneficial effect that the present invention brings is, the invention enables gas-oil separation, fluid to be separated, and pressure difference sensing method of the present invention reduces more than 50% existing in the malfunctioning risk of sensing functionality.The magnetic drives differential pressure pick-up structure of the fiber grating that the present invention adopts is simple, with low cost, adopt unique isolating seal formula magnetic drives structure, avoid silicone oil equal pressure Transfer Medium to the long-term corrosion of fiber grating consolidation zone and impact failure, the serviceable life of sensor can well be extended, ensure that it continues good repeatability and sensitivity.
Accompanying drawing explanation
Fig. 1 is the structural representation of the magnetic drives differential pressure pick-up of fiber grating of the present invention.
Embodiment
Embodiment one: present embodiment is described see Fig. 1, the method for sensing of the fluid pressure differential that the magnetic drives differential pressure pick-up based on fiber grating described in present embodiment realizes, the magnetic drives differential pressure pick-up of described fiber grating comprises No. 1 nonmetal cylinder 1, No. 2 cylinders 2, No. 1 overload protecting mechanism 5-1, No. 2 overload protecting mechanism 5-2, No. 3 overload protecting mechanism 5-3, No. 4 overload protecting mechanism 5-4, high_voltage isolation diaphragm 6-1, low pressure isolation diaphragm 6-2, flexible sheet 7 is measured at center, No. 1 strong magnet 8-1, No. 2 strong magnet 8-2, elastic cantilever 9 and the fiber grating 10 with temperature compensation,
No. 1 overload protecting mechanism 5-1, No. 2 overload protecting mechanism 5-2, No. 3 overload protecting mechanism 5-3, No. 4 overload protecting mechanism 5-4, high_voltage isolation diaphragm 6-1, low pressure isolation diaphragm 6-2, center measurement flexible sheet 7 and No. 1 strong magnet 8-1 are all positioned at No. 2 cylinders 2
The bottom surface of No. 2 cylinders 2 is provided with highly pressurised liquid entrance 3, and end face is provided with low-pressure fluid inlet 4,
No. 1 overload protecting mechanism 5-1, No. 2 overload protecting mechanism 5-2 and No. 3 overload protecting mechanism 5-3 are circular configuration,
No. 1 overload protecting mechanism 5-1, No. 2 overload protecting mechanism 5-2 and No. 3 overload protecting mechanism 5-3 are fixed in No. 2 cylinders 2 along the end face of No. 2 cylinders 2 to the direction of bottom surface successively; and No. 1 overload protecting mechanism 5-1, No. 2 overload protecting mechanism 5-2 and No. 3 overload protecting mechanism 5-3 are equipped with through hole
Low pressure isolation diaphragm 6-2 is embedded in No. 2 cylinders 2, and between low-pressure fluid inlet 4 and No. 1 overload protecting mechanism 5-1, No. 1 overload protecting mechanism 5-1 is used for carrying out overload protection to low pressure isolation diaphragm 6-2;
High_voltage isolation diaphragm 6-1 is embedded in No. 2 cylinders 2, and between highly pressurised liquid entrance 3 and No. 3 overload protecting mechanism 5-3, No. 3 overload protecting mechanism 5-3 are used for carrying out overload protection to high_voltage isolation diaphragm 6-1;
Flexible sheet 7 is measured between No. 2 overload protecting mechanism 5-2 and No. 3 overload protecting mechanism 5-3 in center, and the diaphragm edge that flexible sheet 7 is measured at center is fixedly connected with the inwall of No. 2 cylinders 2,
The central vertical that No. 1 strong magnet 8-1 measures flexible sheet 7 by rigid rod and center is fixedly connected with; and rigid rod is through the through hole of No. 2 overload protecting mechanism 5-2; No. 4 overload protecting mechanism 5-4 are nested in outside rigid rod; be fixedly connected with rigid rod; and No. 4 overload protecting mechanism 5-4 measure between flexible sheet 7 at No. 2 overload protecting mechanism 5-2 and center; No. 2 overload protecting mechanism 5-2 are used for carrying out overload protection to No. 4 overload protecting mechanism 5-4
No. 1 nonmetal cylinder 1 is vertically embedded in the sidewall of No. 2 cylinders 2, and between No. 1 overload protecting mechanism 5-1 and No. 2 overload protecting mechanism 5-2,
No. 2 strong magnet 8-2, elastic cantilever 9 and the fiber gratings 10 with temperature compensation are all positioned at No. 1 nonmetal cylinder 1, one end of elastic cantilever 9 is lifted on the end face of No. 1 nonmetal cylinder 1, the other end is fixed with No. 2 strong magnet 8-2, and No. 2 strong magnet 8-2 and No. 1 strong magnet 8-1 opposite sex are oppositely arranged, fiber grating 10 with temperature compensation is pasted on the sidewall of elastic cantilever 9
The scope of the vertical range between No. 2 strong magnet 8-2 and No. 1 strong magnet 8-1 is 3mm to 5mm;
The method for sensing of this fluid pressure differential comprises the steps,
First, the light that wideband light source sends is incident to the fiber grating 10 with temperature compensation through photo-coupler, after reflecting with the fiber grating 10 of temperature compensation, fiber Bragg grating (FBG) demodulator is entered again through photo-coupler, fiber Bragg grating (FBG) demodulator is for recording the wavelength of reflected light, and the result that fiber Bragg grating (FBG) demodulator exports shows on computers and stores;
Secondly, high-temperature silicon oil is filled with in No. 2 cylinders 2, the high-temperature silicon oil in cylinder 2 is made to level off to full state, finally, open two holes in liquid stream on the pipeline in direction, first hole of liquid stream warp is pressure hole, second hole of liquid stream warp is low pressure hole, be communicated with the highly pressurised liquid entrance 3 of No. 2 cylinders 2 by pressure hole on pipeline, the low pressure hole on pipeline is communicated with the low-pressure fluid inlet 4 of No. 2 cylinders 2
The hydraulic pressure difference that the liquid that high and low pressure hole on pipeline is flowed out produces acts on high_voltage isolation diaphragm 6-1 and low pressure isolation diaphragm 6-2, high_voltage isolation diaphragm 6-1, low pressure isolation diaphragm 6-2 is made to produce deformation, and the center that this deformation makes the center that promotes of the high-temperature silicon oil in No. 2 cylinders 2 measure flexible sheet 7 moves axially, make center measure flexible sheet 7 and deformation occurs, and drive No. 1 strong magnet 8-1 to move, because of No. 1 strong magnet 8-1 and No. 2 strong magnet 8-2, there is a natural attraction between the sexes, No. 2 strong magnet 8-2 are made to follow No. 1 strong magnet 8-1 synchronizing moving
The movement of No. 2 strong magnet 8-2 makes elastic cantilever 9 bend, and make the fiber grating 10 with temperature compensation that deformation occur, the signal that the fiber grating 10 with temperature compensation exports delivers to computing machine by (FBG) demodulator, completes the transmission to fluid pressure differential information.
In present embodiment, No. 2 strong magnet 8-2 follow No. 1 strong magnet 8-1 near-synchronous and move.
Specifically, the differential pressure change center that can promote is measured flexible sheet 7 and displacement to a certain degree is axially being occurred, No. 1 strong magnet 8-1 of rigid rod end can synchronously drive No. 2 strong magnet 8-2 in contrast to produce micro-displacement, and then the tangential deformation of elastic cantilever 9 can be caused, cause the small strain of the fiber grating 10 with temperature compensation
Fiber Bragg grating (FBG) demodulator can process its microstrain signal, and the change by reading optical wavelength on computer monitoring software reflects that the micro-displacement of flexible sheet is measured at center indirectly.
Embodiment two: the difference of the method for sensing of a kind of fluid pressure differential realized based on the magnetic drives differential pressure pick-up of fiber grating described in present embodiment and embodiment one is, described No. 1 nonmetal cylinder 1 is nonmetal non-magnetic field shielding cylinder.
In present embodiment, No. 2 strong magnet 8-2 are closed in nonmetal non-magnetic field shielding cylinder, realize the isolation by measured medium and measurement component, preferably protection is carried out when high to fiber grating, when the pressure reduction of low pressure chamber changes, the differential pressure center that can promote is measured flexible sheet 7 and displacement to a certain degree is axially being occurred, No. 1 strong magnet 8-1 of rigid rod end can synchronously drive No. 2 strong magnet 8-2 in contrast to produce micro-displacement, and then the tangential deformation of elastic cantilever 9 can be caused, cause the small strain of the fiber grating 10 with temperature compensation, by can carry out the measurement of different range differential pressure with fiber grating 10 wavelength of temperature compensation and pressure calibration.
Embodiment three: the difference of the method for sensing of a kind of fluid pressure differential realized based on the magnetic drives differential pressure pick-up of fiber grating described in present embodiment and embodiment one is; No. 4 described overload protecting mechanism 5-4 are circular configuration, and No. 4 overload protecting mechanism 5-4 cover the through hole of No. 2 overload protecting mechanism 5-2 completely.Embodiment four: the difference of the method for sensing of a kind of fluid pressure differential realized based on the magnetic drives differential pressure pick-up of fiber grating described in present embodiment and embodiment one is, described center is measured flexible sheet 7 and adopted elastic metallic material, fiber-reinforced polymer or carbon fiber to realize.
Present embodiment, center is measured flexible sheet 7 and is adopted elastic metallic material, fiber-reinforced polymer or carbon fiber to realize, and working diameter, the thickness of center measurement flexible sheet 7 can be selected according to measurement range.
Embodiment five: the difference of the method for sensing of a kind of fluid pressure differential realized based on the magnetic drives differential pressure pick-up of fiber grating described in present embodiment and embodiment one is, it also comprises rigid metal hinge, rigid metal is hingedly connected between No. 1 strong magnet 8-1 and No. 2 cylinder 2, contacts with No. 2 strong magnet 8-2 for overcoming No. 1 strong magnet 8-1.Embodiment six: the difference of the method for sensing of a kind of fluid pressure differential realized based on the magnetic drives differential pressure pick-up of fiber grating described in present embodiment and embodiment five is, described rigid metal hinge is stainless steel wire rope.
In present embodiment, rigid metal hinge or stainless steel wire rope realize, and ensure the measuring accuracy of differential pressure pick-up and creep resisting ability.
Embodiment seven: the difference of the method for sensing of a kind of fluid pressure differential realized based on the magnetic drives differential pressure pick-up of fiber grating described in present embodiment and embodiment one is; described rigid rod is cylindrical; the through hole of No. 2 overload protecting mechanism 5-2 is circular, and rigid rod is embedded in the through hole of No. 2 overload protecting mechanism 5-2.
In present embodiment, by embedded fixing to rigid rod of the through hole of No. 2 overload protecting mechanism 5-2, for overcoming that No. 1 strong magnet 8-1 and No. 2 strong magnet 8-2 is attracting due to magnetic, No. 1 strong magnet 8-1 and No. 2 strong magnet 8-2 that be that cause contacts.
Embodiment eight: the difference of the method for sensing of a kind of fluid pressure differential realized based on the magnetic drives differential pressure pick-up of fiber grating described in present embodiment and embodiment one is, described elastic cantilever 9 adopts elastic metallic material or fibrous composite to realize.
Claims (8)
1. the method for sensing of the fluid pressure differential realized based on the magnetic drives differential pressure pick-up of fiber grating, the magnetic drives differential pressure pick-up of described fiber grating comprises No. 1 nonmetal cylinder (1), No. 2 cylinders (2), No. 1 overload protecting mechanism (5-1), No. 2 overload protecting mechanisms (5-2), No. 3 overload protecting mechanisms (5-3), No. 4 overload protecting mechanisms (5-4), high_voltage isolation diaphragm (6-1), low pressure isolation diaphragm (6-2), flexible sheet (7) is measured at center, No. 1 strong magnet (8-1), No. 2 strong magnets (8-2), elastic cantilever (9) and the fiber grating (10) with temperature compensation,
No. 1 overload protecting mechanism (5-1), No. 2 overload protecting mechanisms (5-2), No. 3 overload protecting mechanisms (5-3), No. 4 overload protecting mechanisms (5-4), high_voltage isolation diaphragm (6-1), low pressure isolation diaphragm (6-2), center measurement flexible sheet (7) and No. 1 strong magnets (8-1) are all positioned at No. 2 cylinders (2)
The bottom surface of No. 2 cylinders (2) is provided with highly pressurised liquid entrance (3), and end face is provided with low-pressure fluid inlet (4),
No. 1 overload protecting mechanism (5-1), No. 2 overload protecting mechanisms (5-2) and No. 3 overload protecting mechanisms (5-3) are circular configuration,
No. 1 overload protecting mechanism (5-1), No. 2 overload protecting mechanisms (5-2) and No. 3 overload protecting mechanisms (5-3) are fixed in No. 2 cylinders (2) along the end face of No. 2 cylinders (2) to the direction of bottom surface successively; and No. 1 overload protecting mechanism (5-1), No. 2 overload protecting mechanisms (5-2) and No. 3 overload protecting mechanisms (5-3) are equipped with through hole
Low pressure isolation diaphragm (6-2) is embedded in No. 2 cylinders (2), and being positioned between low-pressure fluid inlet (4) and No. 1 overload protecting mechanism (5-1), No. 1 overload protecting mechanism (5-1) is for carrying out overload protection to low pressure isolation diaphragm (6-2);
High_voltage isolation diaphragm (6-1) is embedded in No. 2 cylinders (2), and being positioned between highly pressurised liquid entrance (3) and No. 3 overload protecting mechanisms (5-3), No. 3 overload protecting mechanisms (5-3) are for carrying out overload protection to high_voltage isolation diaphragm (6-1);
Center is measured flexible sheet (7) and is positioned between No. 2 overload protecting mechanisms (5-2) and No. 3 overload protecting mechanisms (5-3); and the diaphragm edge that flexible sheet (7) is measured at center is fixedly connected with the inwall of No. 2 cylinders (2)
The central vertical that No. 1 strong magnet (8-1) measures flexible sheet (7) by rigid rod and center is fixedly connected with; and rigid rod is through the through hole of No. 2 overload protecting mechanisms (5-2); No. 4 overload protecting mechanisms (5-4) are nested in outside rigid rod; be fixedly connected with rigid rod; and No. 4 overload protecting mechanisms (5-4) are positioned between No. 2 overload protecting mechanisms (5-2) and center measurement flexible sheet (7); No. 2 overload protecting mechanisms (5-2) are for carrying out overload protection to No. 4 overload protecting mechanisms (5-4)
No. 1 nonmetal cylinder (1) is vertically embedded in the sidewall of No. 2 cylinders (2), and is positioned between No. 1 overload protecting mechanism (5-1) and No. 2 overload protecting mechanisms (5-2),
No. 2 strong magnets (8-2), elastic cantilever (9) and the fiber gratings (10) with temperature compensation are all positioned at No. 1 nonmetal cylinder (1), one end of elastic cantilever (9) is lifted on the end face of No. 1 nonmetal cylinder (1), the other end is fixed with No. 2 strong magnets (8-2), and No. 2 strong magnets (8-2) are oppositely arranged with No. 1 strong magnet (8-1) opposite sex, fiber grating (10) with temperature compensation is pasted on the sidewall of elastic cantilever (9)
The scope of the vertical range between No. 2 strong magnets (8-2) and No. 1 strong magnet (8-1) is 3mm to 5mm;
It is characterized in that, the method for sensing of this fluid pressure differential comprises the steps:
First, the light that wideband light source sends is incident to the fiber grating (10) with temperature compensation through photo-coupler, after reflecting with the fiber grating (10) of temperature compensation, fiber Bragg grating (FBG) demodulator is entered again through photo-coupler, fiber Bragg grating (FBG) demodulator is for recording the wavelength of reflected light, and the result that fiber Bragg grating (FBG) demodulator exports shows on computers and stores;
Secondly, in No. 2 cylinders (2), be filled with high-temperature silicon oil, make the high-temperature silicon oil in cylinder (2) level off to full state;
Finally, on the pipeline in direction, two holes are opened in liquid stream, first hole of liquid stream warp is pressure hole, second hole of liquid stream warp is low pressure hole, pressure hole on pipeline is communicated with the highly pressurised liquid entrance (3) of No. 2 cylinders (2), low pressure hole on pipeline is communicated with the low-pressure fluid inlet (4) of No. 2 cylinders (2)
Height on pipeline, the hydraulic pressure difference that the liquid that low pressure hole is flowed out produces acts on high_voltage isolation diaphragm (6-1) and low pressure isolation diaphragm (6-2), make high_voltage isolation diaphragm (6-1), low pressure isolation diaphragm (6-2) produces deformation, and the center that this deformation makes the center that promotes of the high-temperature silicon oil in No. 2 cylinders (2) measure flexible sheet (7) moves axially, make center measure flexible sheet (7) and deformation occurs, and drive No. 1 strong magnet (8-1) mobile, because of No. 1 strong magnet (8-1) and No. 2 strong magnets (8-2), there is a natural attraction between the sexes, No. 2 strong magnets (8-2) are made to follow No. 1 strong magnet (8-1) synchronizing moving,
The movement of No. 2 strong magnets (8-2) makes elastic cantilever (9) bend, make the fiber grating (10) with temperature compensation that deformation occur, the signal exported with the fiber grating (10) of temperature compensation delivers to computing machine by (FBG) demodulator, completes the transmission to fluid pressure differential information.
2. the method for sensing of fluid pressure differential that realizes of the magnetic drives differential pressure pick-up based on fiber grating according to claim 1, it is characterized in that, No. 1 described nonmetal cylinder (1) is nonmetal non-magnetic field shielding cylinder.
3. the method for sensing of fluid pressure differential that realizes of the magnetic drives differential pressure pick-up based on fiber grating according to claim 1; it is characterized in that; No. 4 described overload protecting mechanisms (5-4) are circular configuration, and No. 4 overload protecting mechanisms (5-4) cover the through hole of No. 2 overload protecting mechanisms (5-2) completely.
4. the method for sensing of fluid pressure differential that realizes of the magnetic drives differential pressure pick-up based on fiber grating according to claim 1, it is characterized in that, described center is measured flexible sheet (7) and is adopted elastic metallic material, fiber-reinforced polymer or carbon fiber to realize.
5. the method for sensing of fluid pressure differential that realizes of the magnetic drives differential pressure pick-up based on fiber grating according to claim 1, it is characterized in that, it also comprises rigid metal hinge, rigid metal is hingedly connected between No. 1 strong magnet (8-1) and No. 2 cylinders (2), contacts with No. 2 strong magnets (8-2) for overcoming No. 1 strong magnet (8-1).
6. the method for sensing of fluid pressure differential that realizes of the magnetic drives differential pressure pick-up based on fiber grating according to claim 5, it is characterized in that, described rigid metal hinge is stainless steel wire rope.
7. the method for sensing of fluid pressure differential that realizes of the magnetic drives differential pressure pick-up based on fiber grating according to claim 1; it is characterized in that; described rigid rod is cylindrical; the through hole of No. 2 overload protecting mechanisms (5-2) is circular, and rigid rod is embedded in the through hole of No. 2 overload protecting mechanisms (5-2).
8. the method for sensing of fluid pressure differential that realizes of the magnetic drives differential pressure pick-up based on fiber grating according to claim 1, it is characterized in that, described elastic cantilever (9) adopts elastic metallic material or fibrous composite to realize.
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| CN109799876B (en) * | 2018-12-29 | 2020-11-20 | 联想(北京)有限公司 | Terminal device and method of controlling the same |
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| JP4817786B2 (en) * | 2005-10-03 | 2011-11-16 | 株式会社山武 | Differential pressure measurement system and differential pressure measurement method |
| CN202255738U (en) * | 2011-07-15 | 2012-05-30 | 武汉理工光科股份有限公司 | Novel fiber bragg grating temperature pressure sensor |
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