CN107621328A - A kind of atmospheric pressure measurement apparatus and method - Google Patents
A kind of atmospheric pressure measurement apparatus and method Download PDFInfo
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- CN107621328A CN107621328A CN201710800809.6A CN201710800809A CN107621328A CN 107621328 A CN107621328 A CN 107621328A CN 201710800809 A CN201710800809 A CN 201710800809A CN 107621328 A CN107621328 A CN 107621328A
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- bragg grating
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- 238000009530 blood pressure measurement Methods 0.000 title claims abstract description 24
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- 239000013307 optical fiber Substances 0.000 claims abstract description 56
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- 238000005259 measurement Methods 0.000 description 6
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Abstract
The embodiments of the invention provide a kind of atmospheric pressure measurement apparatus and method, described device to include：Housing, aneroid capsule, cantilever beam, the first optical fiber, the second optical fiber, the first fiber Bragg grating sensor, the second fiber Bragg grating sensor and processor, housing are provided with air admission hole；The fixing end of cantilever beam is arranged on the inwall of housing, and free end is connected with aneroid capsule；First fiber Bragg grating sensor is set on a cantilever beam, is connected respectively with processor, the first optical fiber, wherein, in the perimeter that the first optical fiber extends to housing from the inside of housing；Second fiber Bragg grating sensor is set on a cantilever beam, is connected respectively with processor, the second optical fiber, wherein, the second optical fiber is extended in the perimeter of the housing from the inside of the housing.Pass through scheme provided in an embodiment of the present invention, it is possible to increase the measuring accuracy of atmospheric pressure.
Description
Technical field
The present invention relates to field of measuring technique, is surveyed more particularly to a kind of atmospheric pressure measurement apparatus, a kind of atmospheric pressure
Amount method.
Background technology
Meteorological work plays very important effect to preventing and reducing natural disasters.Because atmospheric pressure and meteorology have close pass
System, therefore, in meteorological work, generally monitors meteorology in real time by measuring atmospheric pressure.
In the prior art, weather station generally measures atmospheric pressure by electronic sensor, also there is researcher's proposition
Atmospheric pressure is measured using optical fibre displacement sensor, it is relatively low that both modes for measuring atmospheric pressures have measuring accuracy
The shortcomings that.Specifically, in actual applications, electronic sensor is vulnerable to Electromagnetic Interference, and needs actively powered；And optical fiber
Displacement transducer is to measure displacement by measuring light intensity magnitude, and then draws atmospheric pressure intensity values by displacement, but light exists
Because of the decay of power light intensity magnitude can be caused to reduce in transmitting procedure, so as to cause the accuracy of atmospheric pressure measured compared with
It is low.
The content of the invention
The purpose of the embodiment of the present invention is to provide a kind of atmospheric pressure measurement apparatus and method, to improve atmospheric pressure
Measuring accuracy.Concrete technical scheme is as follows：
In a first aspect, the embodiments of the invention provide a kind of atmospheric pressure measurement apparatus, including：Housing, aneroid capsule, hang
Arm beam, the first optical fiber, the second optical fiber, the first fiber Bragg grating sensor, the second fiber Bragg grating sensor and place
Manage device；
The housing is provided with air admission hole, and the aneroid capsule, the cantilever beam, first Fiber Bragg Grating FBG
Sensor, second fiber Bragg grating sensor are respectively positioned on the enclosure interior；
Wherein, the aneroid capsule is fixed on the inside of the housing；
The fixing end of the cantilever beam is arranged on the inwall of the housing, and free end is connected with the aneroid capsule
Connect；
First fiber Bragg grating sensor is arranged on the cantilever beam, respectively with the processor, described
First optical fiber is connected, wherein, first optical fiber is extended in the perimeter of the housing from the inside of the housing；
Second fiber Bragg grating sensor is arranged on the cantilever beam, respectively with the processor, described
Second optical fiber is connected, wherein, second optical fiber is extended in the perimeter of the housing from the inside of the housing.
Optionally, the quantity of the aneroid capsule is at least two, wherein, each aneroid capsule is connected in series to form vacuum
Bellows group, the aneroid capsule group are connected with the cantilever beam by connecting rod.
Optionally, the aneroid capsule is the cavity that two panels flexible sheet is formed.
Optionally, first fiber Bragg grating sensor and second fiber Bragg grating sensor are symmetrical
Ground is welded in the side wall of the cantilever beam.
Optionally, two symmetrical grooves, first Fiber Bragg Grating FBG are provided with the side wall of the cantilever beam
In a groove, second fiber Bragg grating sensor is located in another groove sensor.
Optionally, described two symmetrical grooves are less than described two symmetrical recessed to the distance of the cantilever beam fixing end
Distance of the groove to the cantilever beam free end.
Optionally, the cantilever beam is equi intensity cantilever.
Second aspect, the embodiment of the present invention additionally provide a kind of atmospheric pressure measuring method, it is characterised in that applied to such as
The processor of atmospheric pressure measurement apparatus described in above-mentioned first aspect embodiment, methods described include：
Receive first fiber Bragg grating sensor and second fiber Bragg grating sensor transmitting
Signal, wherein, when atmospheric pressure is not equal to standard atmospheric pressure, first fiber Bragg grating sensor and described
Two fiber Bragg grating sensors are to the processor transmission signal；
The first drift value of the centre wavelength of the first reflected light of first fiber Bragg grating sensor is calculated, with
And the second drift value of the centre wavelength of the second reflected light of second fiber Bragg grating sensor；
It is poor that first relative drift value and the second relative drift value are made, and obtains target with respect to drift value difference, and according to pre-
If relative drift value difference and atmospheric pressure corresponding relation, obtain the target with respect to atmospheric pressure corresponding to drift value difference
By force, wherein, the described first relative drift value is first drift value and the ratio of the centre wavelength of first reflected light, institute
It is second drift value and the ratio of the centre wavelength of second reflected light to state the second relative drift value.
Compared with prior art, atmospheric pressure measurement apparatus provided in an embodiment of the present invention, including housing, aneroid capsule,
Cantilever beam, the first optical fiber, the second optical fiber, the first fiber Bragg grating sensor, the second fiber Bragg grating sensor and
Processor, air admission hole is provided with housing, when atmospheric pressure is not standard atmospheric pressure, aneroid capsule is inside and outside
Pressure difference can change, and aneroid capsule can produce deformation, and then produce stress to cantilever beam, and cantilever beam is in the presence of stress
Produce strain, the first fiber Bragg grating sensor being connected with cantilever beam and the sensing of the second fiber Bragg grating sensor
When being strained to cantilever beam, the centre wavelength of both reflected lights is drifted about, and now both launch to processor respectively
Signal, processor calculate the target of both centre wavelengths with respect to drift value difference, then, according to pre- when receiving signal
If relative drift value difference and atmospheric pressure corresponding relation, draw the target with respect to atmospheric pressure corresponding to drift value difference
By force.
In this programme, fiber Bragg grating sensor electromagnetism interference, and there is passivity, atmospheric pressure can be improved
Measuring accuracy；And the relative drift of the centre wavelength of the reflected light by measuring two fiber Bragg grating sensors
Difference is measured to obtain corresponding atmospheric pressure, can further improve the measuring accuracy of atmospheric pressure.Specifically, first,
The centre wavelength of reflected light is relatively stable, will not reduce because of the power attenuation of light, secondly, by by two optical fiber Bragg light
It is poor that the centre wavelength of gate sensor reflected light is made with respect to drift value, can avoid environment temperature to atmospheric pressure measuring accuracy
Influence.Therefore, the accuracy for the atmospheric pressure measured by this programme is higher.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
A kind of structural representation for atmospheric pressure measurement apparatus that Fig. 1 is provided by the embodiment of the present invention；
A kind of flow chart for atmospheric pressure measuring method that Fig. 2 is provided by the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made
Embodiment, belong to the scope of protection of the invention.
In order to solve technical problem existing for prior art, the embodiments of the invention provide a kind of atmospheric pressure measurement apparatus
And method.
In a first aspect, the atmospheric pressure measurement apparatus provided first below the embodiment of the present invention is introduced.
As shown in figure 1, a kind of atmospheric pressure measurement apparatus provided in an embodiment of the present invention, can include：
Housing 101, aneroid capsule 102, cantilever beam 103, the first optical fiber 104, the second optical fiber 105, the first optical fiber Bragg
Grating sensor 106, the second fiber Bragg grating sensor 107 and processor 108,
The housing 101 is provided with air admission hole 1011, and the aneroid capsule 102, the cantilever beam 103, described first
Fiber Bragg grating sensor 106, second fiber Bragg grating sensor 107 are respectively positioned on the interior of the housing 101
Portion；
Wherein, the aneroid capsule 102 is fixed on the inside of the housing 101；
The fixing end of the cantilever beam 103 be arranged on on the inwall of the housing 101, and free end and the vacuum diaphragm
Box 102 is connected；
First fiber Bragg grating sensor 106 is arranged on the cantilever beam 103, respectively with the processor
108th, first optical fiber 104 is connected, wherein, first optical fiber 104 extends to the shell from the inside of the housing 101
In the perimeter of body 101；
Second fiber Bragg grating sensor 107 is arranged on the cantilever beam 103, respectively with the processor
108th, second optical fiber 105 is connected, wherein, second optical fiber 105 extends to the shell from the inside of the housing 101
In the perimeter of body 101.
It is emphasized that the embodiment of the present invention is not specifically limited to the shape and material of housing, specifically, housing
It can be the shape such as square, circular；The material of housing can be metal or nonmetallic, and these are all rational.In addition, this hair
Bright position to air admission hole, form and dimension also do not limit, specifically, air admission hole can above housing, below, it is left
Face, left side etc.；Air admission hole can be square, circle etc.；The size of air admission hole can greatly can also be small, this is all rational.And
And aneroid capsule can be perfect vacuum or micro-vacuum, this is all rational.
Meanwhile the embodiment of the present invention is also not specifically limited to the model of the first optical fiber and the model of the second optical fiber.Specifically
, the first optical fiber and the second optical fiber can be single-mode fiber or multimembrane optical fiber, but because monofilm optical fiber is applied to telecommunication, because
This, preferred monofilm optical fiber in the embodiment of the present invention；And first the model of optical fiber and the second optical fiber can be identical, can also
It is different, but in order to improve the measuring accuracy of atmospheric pressure, preferred the first optical fiber of same model in the embodiment of the present invention
With the second optical fiber.
Need further, it is emphasized that fiber Bragg grating sensor can be realized to physical quantitys such as temperature, strains
Direct measurement.Because the fiber Bragg grating sensor of same model is identical to the sensing capability of temperature, therefore, in order to improve
The measuring accuracy of atmospheric pressure, in the embodiment of the present invention, it is preferable that the first fiber Bragg grating sensor and the second optical fiber
The model of Bragg grating sensor is identical.Processor can be any device for having signal analysis and data processing function,
For example, processor can be (FBG) demodulator etc., this is all rational.Moreover, the first fiber Bragg grating sensor and the second light
The connected mode of fine Bragg grating sensor and processor：Can be wired connection or wireless connection, the present invention
Embodiment is to the first fiber Bragg grating sensor and the connected mode of the second fiber Bragg grating sensor and processor
It is not specifically limited.In addition, the fixed form that cantilever beam is fixed on housing also has diversified forms, can be directly welded at shell
On body, it can also be fixed by connecting rod, the present invention is not specifically limited to this.
It should be noted that when atmospheric pressure is standard atmospheric pressure P0When, the pressure outside aneroid capsule is atmospheric pressure
Strong P0, the pressure inside aneroid capsule is approximately 0, and aneroid capsule is inside and outside to have pressure difference P0, therefore, can be to aneroid capsule surface
Produce pressure F0=P0S, wherein, S=π × R2, R is the surface diameter of aneroid capsule.Now, the first optical fiber Bragg light is measured
The centre wavelength of the reflected light of gate sensor is λB1, measure the centre wavelength of the reflected light of the second fiber Bragg grating sensor
For λB2。
In actual applications, when atmospheric pressure is standard atmospheric pressure P, i.e., now atmospheric pressure is not standard atmospheric pressure
Strong P0When, the inside and outside pressure difference of aneroid capsule is P, and the variable quantity of pressure difference is Δ P inside and outside aneroid capsule, caused pressure
Power difference is Δ F.Aneroid capsule can produce deformation in the presence of pressure differential Δ F, because aneroid capsule one end is fixed on housing
Inside, the other end of the aneroid capsule being connected with cantilever beam generate displacement in the presence of pressure differential Δ F, aneroid capsule pair with
Its cantilever beam connected produces stress F, and cantilever beam produces strain in the presence of stress, the first optical fiber cloth being connected with cantilever beam
When glug grating sensor and the second fiber Bragg grating sensor sense that cantilever beam strains, the first optical fiber Bragg
The central wavelength lambda of the reflected light of grating sensorB1The drift value of generation is Δ λB1, the second fiber Bragg grating sensor
The central wavelength lambda of reflected lightB2The drift value of generation is Δ λB2, now both connect respectively to processor transmission signal, processor
When receiving signal, the relative drift value difference of both centre wavelengths is calculated, then, according to relative drift value difference and atmospheric pressure
Strong corresponding relation, draw the size of now atmospheric pressure.Wherein, it is the drift by the centre wavelength of reflected light with respect to drift value
What the centre wavelength of shifting amount divided by its corresponding reflected light obtained.
It should be noted that because fiber Bragg grating sensor can not only sense the strain of cantilever beam, moreover it is possible to feel
Environment temperature is answered, when fiber Bragg grating sensor senses that strain or fiber Bragg grating sensor occur for cantilever beam
When sensing that the environment temperature residing for it changes, the centre wavelength of the reflected light of fiber Bragg grating sensor can float
Move.In order to avoid because environment temperature changes and caused by the centre wavelength of reflected light of fiber Bragg grating sensor become
Change, the first fiber Bragg grating sensor and the second fiber Bragg grating sensor are welded on to the side wall of cantilever beam simultaneously
On, the first fiber Bragg grating sensor and the second fiber Bragg grating sensor when sensing temperature change, both
Reflection center wavelength of light relative drift value it is identical, by the centre wavelength for trying to achieve two fiber Bragg grating sensors
With respect to drift value difference, you can produced with accurately trying to achieve in response to change relative drift value difference, so as to avoid environment
Temperature changes the influence to atmospheric pressure measuring accuracy.
It should be noted that " first " and " second " in the embodiment of the present invention, which is used only for distinguishing from name, belongs to same
Two objects of type, and do not have any limiting meaning.Such as：In " first " and " the second optical fiber " in " the first optical fiber "
" second " is used only for distinguishing two optical fiber from name, and does not have any limiting meaning.And for example：" the first optical fiber Bragg
" second " in " first " and " the second fiber Bragg grating sensor " in grating sensor " is used only for from the upper area of name
It is divided to two fiber Bragg grating sensors, and does not have any limiting meaning.
Compared with prior art, in technical scheme, fiber Bragg grating sensor electromagnetism interference, and have
There is passivity, the measuring accuracy of atmospheric pressure can be improved；And pass through two fiber Bragg grating sensors of measurement
Corresponding atmospheric pressure is calculated in the relative drift value difference of the centre wavelength of reflected light, can further improve air
The measurement accuracy of pressure.Specifically, first, the centre wavelength of reflected light is relatively stable, will not reduce because of the power attenuation of light,
Secondly, it is poor by the way that the centre wavelength of two fiber Bragg grating sensor reflected lights is made with respect to drift value, ring can be eliminated
Influence of the border temperature to atmospheric pressure measurement accuracy.Therefore, the accuracy for the atmospheric pressure measured by this programme is higher.
Optionally, the quantity of the aneroid capsule is at least two, wherein, each aneroid capsule is connected in series to form vacuum
Bellows group, the aneroid capsule group are connected with the cantilever beam by connecting rod.
When the quantity of aneroid capsule is multiple, each aneroid capsule is subjected to series connection and forms aneroid capsule group.With only having
One aneroid capsule is compared, and when atmospheric pressure is not standard atmospheric pressure, each aneroid capsule in aneroid capsule group is sent out
Raw deformation, so as to increase the deformation quantity of aneroid capsule, now, aneroid capsule group becomes to the stress of coupled cantilever beam
Greatly, the dependent variable of cantilever beam also correspondingly increases, the first fiber Bragg grating sensor and the second light being connected with cantilever beam
The relative drift value of the centre wavelength of the reflected light of fine Bragg grating sensor increases, therefore, atmospheric pressure measurement apparatus
In aneroid capsule group can increase the relative drift value of two fiber Bragg grating sensor centre wavelength, it is big so as to improve
The measuring accuracy of gas pressure measurer.
It should be noted that the aneroid capsule of 3 series connection is exemplarily depicted in Fig. 1, naturally it is also possible to be 1,2
Or it is multiple, the present invention is not limited the quantity of aneroid capsule.
Optionally, the aneroid capsule is the cavity that two panels flexible sheet is formed.
Because flexible sheet is to very pressure-sensitive, i.e., when the inside and outside pressure difference of aneroid capsule changes, flexible sheet
Obvious deformation can be produced, i.e. aneroid capsule can produce larger displacement, so as to connected cantilever beam produce compared with
Big stress so that dependent variable caused by cantilever beam increases, the first fiber Bragg grating sensor for being connected with cantilever beam and
The relative drift value of the centre wavelength of the reflected light of second fiber Bragg grating sensor also increases, therefore, by using two panels
Flexible sheet composition aneroid capsule can increase the relative drift value of two fiber Bragg grating sensor centre wavelength, so as to
Improve the measurement sensitivity and accuracy of atmospheric pressure measurement apparatus.
Optionally, first fiber Bragg grating sensor and second fiber Bragg grating sensor are symmetrical
Ground is welded in the side wall of the cantilever beam.
First fiber Bragg grating sensor and the second fiber Bragg grating sensor are symmetrically welded on cantilever
When in the side wall of beam, when cantilever beam is stressed, the first fiber Bragg grating sensor and the second Fiber Bragg Grating FBG
The strain that sensor sensing arrives is in opposite direction, and size is identical.Due to the first fiber Bragg grating sensor and the second optical fiber cloth
The strain that glug grating sensor senses is in opposite direction, so the center of the reflected light of the first fiber Bragg grating sensor
The drift bearing of the centre wavelength of the drift bearing of wavelength and the reflected light of the second fiber Bragg grating sensor is also on the contrary, i.e.
The relative drift value of the centre wavelength of the reflected light of first fiber Bragg grating sensor and the second Fiber Bragg Grating FBG pass
The relative drift value of the centre wavelength of the reflected light of sensor opposite number each other, it is poor by the way that try to achieve two relative drift values are made,
The absolute value sum of relative drift value can be obtained, that is to say, that by by the first fiber Bragg grating sensor and second
Fiber Bragg grating sensor is symmetrically welded in the side wall of cantilever beam, can increase relative drift value, so as to carry
The accuracy of high atmospheric pressure measurement apparatus.
For example, in Fig. 1, when atmospheric pressure is less than standard atmospheric pressure, the direction of displacement of aneroid capsule is the right side,
, to the stress caused by cantilever beam to the right, the strain that the first fiber Bragg grating sensor senses is stretching downwards for it, and
The strain that first fiber Bragg grating sensor senses is compresses upwards, the reflection of the first fiber Bragg grating sensor
The drift bearing of the centre wavelength of light is red shift, i.e., is drifted about to the big direction of wavelength, relative drift value on the occasion of；Then the second optical fiber
The drift bearing of the centre wavelength of the reflected light of Bragg grating sensor is blue shift, i.e., is drifted about to the small direction of wavelength, relatively
Drift value is negative value.Poor by the way that two relative drift values are made, the size of the relative drift value difference of acquisition is two relative drifts
The size sum of shifting amount.Therefore, under identical atmospheric pressure, compared with an only fiber Bragg grating sensor,
Two fiber Bragg grating sensors are symmetrically welded on cantilever beam, by by the phase of two fiber Bragg grating sensors
The size of relative displacement can be increased by making difference to drift value, so as to improve the accuracy of atmospheric pressure measurement apparatus.
Optionally, two symmetrical grooves, first Fiber Bragg Grating FBG are provided with the side wall of the cantilever beam
In a groove, second fiber Bragg grating sensor is located in another groove sensor.
Because the dependent variable of cantilever beam any position is relevant with the thickness of the opening position cantilever beam, cantilever beam is in the opening position
Thickness it is smaller, cantilever beam is bigger in the dependent variable of the opening position.Two symmetrical grooves, groove place are set on a cantilever beam
The thickness of opening position cantilever beam reduces, and the strain quantitative change of cantilever beam is big at groove position.By by the first optical fiber Bragg
Grating sensor and the second fiber Bragg grating sensor are arranged on the groove of cantilever beam, can increase by the first optical fiber Bradley
The dependent variable of lattice grating sensor and the second fiber Bragg grating sensor, the first fiber Bragg grating sensor and second
The relative drift value of the centre wavelength of the reflected light of fiber Bragg grating sensor increases, and then relative drift value difference
Size also becomes big, so as to increase the accuracy of atmospheric pressure measurement apparatus.
Optionally, described two symmetrical grooves are less than described two symmetrical recessed to the distance of the cantilever beam fixing end
Distance of the groove to the cantilever beam free end.
Because the distance dependent of cantilever beam fixing end is arrived in dependent variable and the position of cantilever beam any position, the position is to hanging
The distance of arm beam fixing end is smaller, and cantilever beam is bigger in the dependent variable of the opening position.By the way that two symmetrical grooves are arranged on
The position nearer apart from cantilever beam, dependent variable at groove place can be increased.Due to the first fiber Bragg grating sensor and
Second fiber Bragg grating sensor is set in two symmetrical grooves of cantilever beam, it is thus possible to increase the first light
The dependent variable that fine Bragg grating sensor and the second fiber Bragg grating sensor sense, the first Fiber Bragg Grating FBG
The relative drift value of the centre wavelength of the reflected light of sensor and the second fiber Bragg grating sensor increases, and then relatively
The size of drift value difference also becomes big, so as to increase the accuracy of atmospheric pressure measurement apparatus.
Optionally, the cantilever beam is equi intensity cantilever.
When by same stress, because the dependent variable of uniform cantilever beam is less than the dependent variable of equi intensity cantilever,
Therefore, the first fiber Bragg grating sensor and the second Fiber Bragg Grating FBG can be increased by using equi intensity cantilever
The dependent variable that sensor sensing arrives, and then the first fiber Bragg grating sensor and the second fiber Bragg grating sensor
The drift value of the centre wavelength of reflected light increases, and the size with respect to drift value difference also becomes big, so as to increase atmospheric pressure
The accuracy of strong measurement apparatus.
Second aspect, a kind of atmospheric pressure measuring method provided below the embodiment of the present invention are introduced.
Wherein, the atmospheric pressure measuring method is applied to the processor of the atmospheric pressure measurement apparatus described in first aspect.
As shown in Fig. 2 a kind of charging optimization method that the embodiment of the present invention is provided, may include steps of：
S201, receive first fiber Bragg grating sensor and second fiber Bragg grating sensor hair
The signal penetrated, wherein, when atmospheric pressure is not equal to standard atmospheric pressure, first fiber Bragg grating sensor and institute
The second fiber Bragg grating sensor is stated to the processor transmission signal；
The light that light source is sent can pass through the first fiber Bragg grating sensor during the first optical fiber transmits；
During second optical fiber transmits, the second Bragg grating sensor can be passed through.First fiber Bragg grating sensor, second
Fiber Bragg grating sensor can be believed when sensing that cantilever beam strains to the processor for communicating with connection
Number, to receive the signal of the first fiber Bragg grating sensor and the second fiber Bragg grating sensor in processor
When, carry out follow-up S102.
It should be noted that when atmospheric pressure is not standard atmospheric pressure, the pressure difference inside and outside aneroid capsule becomes
Change, therefore, aneroid capsule can deform upon, and because aneroid capsule one end is fixed on the inside of housing, what is be connected with cantilever beam is true
For the other end of empty bellows there occurs displacement in the presence of pressure difference, aneroid capsule produces stress to connected cantilever beam,
Cantilever beam produces strain in the presence of stress, now, the first fiber Bragg grating sensor being connected with cantilever beam and
When two fiber Bragg grating sensors sense that cantilever beam strains, signal is sent to the processor for communicating with connection.
S202, calculate the first drift of the centre wavelength of the first reflected light of first fiber Bragg grating sensor
Second drift value of amount and the centre wavelength of the second reflected light of second fiber Bragg grating sensor；
The first fiber Bragg grating sensor is received in processor and the second fiber Bragg grating sensor is sent
Signal when, illustrate that now cantilever beam strains, the middle cardiac wave of the first reflected light of the first fiber Bragg grating sensor
The centre wavelength of long and the second fiber Bragg grating sensor the second reflected light shifts.Therefore, processing is passed through
Device calculates the second offset of the first offset of the centre wavelength of the first reflected light and the centre wavelength of the second reflected light.With
Just S203 can calculate atmospheric pressure now by the first offset and the second offset calculated.
S203, it is poor that the first relative drift value and the second relative drift value are made, and obtains relative drift value difference, and according to institute
Relative drift value difference and the one-to-one relationship of atmospheric pressure are stated, obtains corresponding atmospheric pressure, wherein, described first is relative
Drift value is first drift value and the ratio of the centre wavelength of first reflected light, and the described second relative drift value is institute
State the second drift value and the ratio of the centre wavelength of second reflected light.
Before atmospheric pressure is measured, by substantial amounts of simulated experiment, it has been found that relative drift value difference and atmospheric pressure
Strong corresponding relation, therefore, when obtaining relative drift value difference, i.e., it can be accurately obtained corresponding atmospheric pressure.Need
Illustrate, the relational expression of relative drift value difference and atmospheric pressure can be learnt by substantial amounts of simulated experiment, or
The graph of relation of relative drift value difference and atmospheric pressure is drawn out, or to obtain by writing code relative drift value poor
Value and the corresponding relation of atmospheric pressure, these are all rational, and the present invention is not specifically limited to this.
For example, atmospheric pressure measurement apparatus as shown in Figure 1, when atmospheric pressure is standard atmospheric pressure, it is assumed that
The standard atmospheric pressure is 1000hPa, and the centre wavelength for measuring the first fiber Bragg grating sensor reflected light is λB1=
1543nm, λB2=1548nm；Aneroid capsule radius is R=30mm, then surface area is S ≈ 2827mm2=0.002827m2, and should
In atmospheric pressure measurement apparatus, there are 3 aneroid capsules to be composed in series aneroid capsule group.
When real atmosphere pressure changes to 999hPa from 1000hPa, then there is pressure difference inside and outside 3 aneroid capsules, produce
To the right, size is F=3 × (Δ P × S)=0.8481N to raw force direction, and the active force is applied to the free end of cantilever beam
When, the fiber Bragg grating sensor on the left of cantilever beam is stretched, and causes the reflected light of the fiber Bragg grating sensor
Wavelength increase, by be calculated its with respect to drift value be+12pm；Fiber Bragg grating sensor pressure on the right side of cantilever beam
Contracting, cause the wavelength increase of the reflected light of the fiber Bragg grating sensor, be by the way that its relative drift value is calculated-
12pm, because influence of the temperature change to two panels FBG is identical, by the way that be calculated two relative displacements are subtracted each other,
The absolute value summation for obtaining relative drift value be 24pm, therefore, in actual applications, when detecting that wavelength drift value relatively reaches
During 24pm, atmospheric pressure reduces 1hPa, because standard atmospheric pressure is 1000hPa, you can obtaining Real-Time Atmospheric pressure is
999hPa。
It should be noted that calculate the first relative drift value and the second relative drift value in processor, by by first
It is poor to make with respect to drift value and the second relative drift value, can eliminate shadow of the environment temperature change to atmospheric pressure measuring accuracy
Ring, and because in the first relative drift value and the second relative drift value, one is positive number, and one is negative, can by making difference
To increase relative drift value, so as to improve the accuracy of measurement atmospheric pressure.Finally, according to relative drift value difference and greatly
The strong one-to-one relationship of air pressure, you can in the hope of corresponding atmospheric pressure.
Compared with prior art, technical scheme provided by the invention, fiber Bragg grating sensor electromagnetism interference, and
With passivity, the measuring accuracy of atmospheric pressure can be improved；And by measuring two fiber Bragg grating sensors
The drift value difference of centre wavelength of reflected light corresponding atmospheric pressure is calculated, can further improve atmospheric pressure
Strong measuring accuracy.Specifically, first, the centre wavelength of reflected light is relatively stable, will not reduce because of the power attenuation of light,
Secondly, it is poor by the way that the centre wavelength of two fiber Bragg grating sensor reflected lights is made with respect to drift value, ring can be avoided
Influence of the border temperature to atmospheric pressure measuring accuracy.Therefore, the accuracy for the atmospheric pressure measured by this programme is higher.
It should be noted that herein, such as first and second or the like relational terms are used merely to a reality
Body or operation make a distinction with another entity or operation, and not necessarily require or imply and deposited between these entities or operation
In any this actual relation or order.Moreover, term " comprising ", "comprising" or its any other variant are intended to
Nonexcludability includes, so that process, method, article or equipment including a series of elements not only will including those
Element, but also the other element including being not expressly set out, or it is this process, method, article or equipment also to include
Intrinsic key element.In the absence of more restrictions, the key element limited by sentence "including a ...", it is not excluded that
Other identical element also be present in process, method, article or equipment including the key element.
Each embodiment in this specification is described by the way of related, identical similar portion between each embodiment
Divide mutually referring to what each embodiment stressed is the difference with other embodiment.It is real especially for system
For applying example, because it is substantially similar to embodiment of the method, so description is fairly simple, related part is referring to embodiment of the method
Part explanation.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the scope of the present invention.It is all
Any modification, equivalent substitution and improvements made within the spirit and principles in the present invention etc., are all contained in protection scope of the present invention
It is interior.
Claims (8)
- A kind of 1. atmospheric pressure measurement apparatus, it is characterised in that including：Housing, aneroid capsule, cantilever beam, the first optical fiber, second Optical fiber, the first fiber Bragg grating sensor, the second fiber Bragg grating sensor and processor；The housing is provided with air admission hole, and the aneroid capsule, the cantilever beam, first optical fiber Bragg grating sensing Device, second fiber Bragg grating sensor are respectively positioned on the enclosure interior；Wherein, the aneroid capsule is fixed on the inside of the housing；The fixing end of the cantilever beam is arranged on the inwall of the housing, and free end is connected with the aneroid capsule；First fiber Bragg grating sensor is arranged on the cantilever beam, respectively with the processor, described first Optical fiber is connected, wherein, first optical fiber is extended in the perimeter of the housing from the inside of the housing；Second fiber Bragg grating sensor is arranged on the cantilever beam, respectively with the processor, described second Optical fiber is connected, wherein, second optical fiber is extended in the perimeter of the housing from the inside of the housing.
- 2. device according to claim 1, it is characterised in that the quantity of the aneroid capsule is at least two, wherein, respectively Individual aneroid capsule is connected in series to form aneroid capsule group, and the aneroid capsule group is connected with the cantilever beam by connecting rod.
- 3. device according to claim 1 or 2, it is characterised in that the aneroid capsule is what two panels flexible sheet was formed Cavity.
- 4. device according to claim 1, it is characterised in that first fiber Bragg grating sensor and described Two fiber Bragg grating sensors are symmetrically welded in the side wall of the cantilever beam.
- 5. device according to claim 4, it is characterised in that be provided with the side wall of the cantilever beam two it is symmetrical recessed Groove, first fiber Bragg grating sensor is in a groove, the second fiber Bragg grating sensor position In another groove.
- 6. device according to claim 5, it is characterised in that described two symmetrical grooves to the cantilever beam fixing end Distance be less than described two symmetrical grooves to the distances of the cantilever beam free end.
- 7. according to the device described in claim any one of 4-6, it is characterised in that the cantilever beam is equi intensity cantilever.
- 8. a kind of atmospheric pressure measuring method, it is characterised in that applied to any one of such as above-mentioned claim 1 to claim 7 The processor of described atmospheric pressure measurement apparatus, methods described include：First fiber Bragg grating sensor and the signal of second fiber Bragg grating sensor transmitting are received, Wherein, when atmospheric pressure is not equal to standard atmospheric pressure, first fiber Bragg grating sensor and second light Fine Bragg grating sensor is to the processor transmission signal；Calculate the first drift value of the centre wavelength of the first reflected light of first fiber Bragg grating sensor, Yi Jisuo State the second drift value of the centre wavelength of the second reflected light of the second fiber Bragg grating sensor；It is poor that first relative drift value and the second relative drift value are made, and obtains target with respect to drift value difference, and according to default With respect to drift value difference and the corresponding relation of atmospheric pressure, the target is obtained with respect to atmospheric pressure corresponding to drift value difference, Wherein, the described first relative drift value is the ratio of the centre wavelength of first drift value and first reflected light, described Second relative drift value is second drift value and the ratio of the centre wavelength of second reflected light.
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| CN201710800809.6A CN107621328B (en) | 2017-09-07 | 2017-09-07 | Atmospheric pressure measuring device and method |
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| CN201710800809.6A CN107621328B (en) | 2017-09-07 | 2017-09-07 | Atmospheric pressure measuring device and method |
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