CN106644245A - Atmosphere pressure measurement system and air pressure measurement method - Google Patents
Atmosphere pressure measurement system and air pressure measurement method Download PDFInfo
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- CN106644245A CN106644245A CN201611219227.0A CN201611219227A CN106644245A CN 106644245 A CN106644245 A CN 106644245A CN 201611219227 A CN201611219227 A CN 201611219227A CN 106644245 A CN106644245 A CN 106644245A
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- Prior art keywords
- air pressure
- atmosphere pressure
- testing fiber
- aneroid capsule
- pressure measurement
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L7/00—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements
- G01L7/02—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements in the form of elastically-deformable gauges
- G01L7/10—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements in the form of elastically-deformable gauges of the capsule type
- G01L7/106—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements in the form of elastically-deformable gauges of the capsule type with optical transmitting or indicating means
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
The invention provides an atmosphere pressure measurement system and an atmosphere pressure measurement method. The atmosphere pressure measurement system comprises the components of an atmosphere pressure sensing device which at least comprises two vacuum membrane boxes and a to-be-measured optical fiber, wherein the vacuum membrane boxes are placed in a distributed manner and are serially connected through the to-be-measured optical fiber, the vacuum membrane boxes are connected with an atmosphere pressure calculating device, the to-be-measured optical fiber is fixed on the surface of the vacuum membrane boxes and is used for converting vacuum membrane box deformation information caused by to-be-measured atmosphere pressure to strain signal light of the to-be-measured optical fiber and transmitting the strain signal light to the atmosphere pressure calculating device; and the atmosphere pressure calculating device which is used for receiving the strain signal light of the to-be-measured optical fiber and calculating the to-be-measured atmosphere pressure based on the strain information. According to the air pressure measurement system and the air pressure measurement method, air pressures at a plurality of different spatial positions are simultaneously acquired; the more accurate atmosphere pressure is obtained through calculation; an influence by different environment factors such as temperature, humidity and air flow in singly measuring atmosphere pressure at several points is prevented; and atmosphere pressure measurement precision is substantially improved.
Description
Technical field
The present invention relates to barometric surveying technical field, more particularly, to a kind of air pressure measurement system and method.
Background technology
Sensor technology is one of important technology of modern surveying and automated system.In Aero-Space, air pressure is one
Individual important parameter, air gauge can be calibrated to a lot of other navigation instruments.Traditional air gauge can not expire completely
For the needs of the anti-electromagnetic interference of the burn-proof and explosion prevention of instrument in sufficient Aero-Space, a kind of compact and strong antijamming capability are developed
Air gauge become in the urgent need to.
Optical fiber sensing technology comes across earliest 20 century 70s, since appearance, has just widely been paid close attention to and has been weighed
Depending on, it is applied in various fields, and serve good effect.In recent years, with the continuous development of optical fiber sensing technology, light
Fiber sensor is widely used in fields such as power system, petrochemical industry, Aero-Space, environmental protection, national defence, and shows wide
Wealthy development prospect.Wherein, distributed testing fiber is a kind of important device of optical fiber sensing technology.
In prior art, Chinese patent CN102680162 " a kind of atmospheric pressure meter based on fiber grating " is using matching
Grating demodulation sends out method, the information of wave length shift is demodulated, so as to try to achieve the deformation journey of the strain size of fiber grating, i.e. aneroid capsule
Degree, finally gives atmospheric pressure value.Detection is optical wavelength rather than luminous power, and light wave long message is not by light work(in optical transmission process
The impact of rate loss, thus accuracy of detection is higher, resolving power is bigger, noise is less.Compare conventional gas measuring system, sensitivity
Height, strain resolving power is strong, and Fibre Optical Sensor electromagnetism interference, anti-vibration, moisture resistant, anticorrosive etc. are very capable so that
This set system also can be normally used for a long time in adverse circumstances, and light weight of the present invention, small volume.
For the measurement of atmospheric pressure, because the factor of impact atmospheric pressure is more and complexity, often in less scope
Interior air pressure all can be variant, and especially in vertical direction, air pressure can reduce with the increase of height above sea level.And prior art
Middle air pressure measuring apparatus can only typically test the atmospheric pressure value of a position, and the detection faces of common air pressure detection probe are again very
Little, this is possible to cause larger measure error.Therefore, Distributed Optical Fiber Sensing Techniques are applied to into barometric surveying can overcome the disadvantages that
Conventional gas measurement apparatus are not enough, with reference to the characteristics of distributed sensor, can simultaneously obtain the air pressure of multiple different spatials
Value, by being calculated more accurately atmospheric pressure intensity values, is obviously improved in certainty of measurement.
The content of the invention
The present invention is to overcome the problems referred to above or solve the above problems at least in part, there is provided a kind of air pressure measurement system and
Method.
According to an aspect of the present invention, there is provided a kind of air pressure measurement system, including air pressure sensing device and air pressure are calculated
Device；The air pressure sensing device, at least including two aneroid capsules and testing fiber, the aneroid capsule is distributed to be placed simultaneously
It is connected in series by testing fiber, is connected with air pressure computing device, the aneroid capsule surface is fixed with the testing fiber, is used
In the aneroid capsule deformation data caused by air pressure to be measured being converted into into the strain signal light of testing fiber and is sent to
Air pressure computing device；The air pressure computing device, for receiving the strain signal light of the testing fiber, is believed based on the strain
Breath, calculates and obtains atmospheric pressure value to be measured.
According to an aspect of the present invention, there is provided a kind of barometric surveying method, including：Step 1, each aneroid capsule will be because of gas
The deformation that pressure is produced is delivered to testing fiber, and the deformation that each aneroid capsule transmission comes is converted into strain letter by testing fiber
Number；Step 2, based on the strain signal tested point atmospheric pressure value is calculated.
The application proposes a kind of air pressure measurement system and method, can simultaneously monitor one section by distributed testing fiber and treat
The STRESS VARIATION of any position on light-metering fibre, therefore multiple test points can be set on distributed testing fiber.For every
Individual test point, using aneroid capsule device the change of atmospheric pressure is experienced, and the change of air pressure is converted to into the deformation of aneroid capsule,
It is applied to again on distributed testing fiber.Monitoring simultaneously just can be carried out to the atmospheric pressure value of multiple points, in conjunction with the sea that each is put
Realize the accurate calculating of air pressure in locus.The application obtains the atmospheric pressure value of multiple different spatials simultaneously, by calculating
To more accurately atmospheric pressure intensity values, it is to avoid several air pressure of independent measurement easily by each side environment such as temperature, humidity, air-flow because
The impact of element, is obviously improved in barometric surveying precision.
Description of the drawings
Fig. 1 is a kind of general frame schematic diagram of the air pressure measurement system according to the embodiment of the present invention；
Fig. 2 is a kind of aneroid capsule structural representation of the air pressure measurement system according to the embodiment of the present invention；
Fig. 3 is a kind of overall flow schematic diagram of the barometric surveying method according to the embodiment of the present invention.
Specific embodiment
With reference to the accompanying drawings and examples, the specific embodiment of the present invention is described in further detail.Hereinafter implement
Example is not limited to the scope of the present invention for illustrating the present invention.
In Fig. 1, in a specific embodiment of the invention, a kind of air pressure measurement system general frame schematic diagram is shown.It is overall
For, including：Air pressure sensing device A1, at least including two aneroid capsule A11 and testing fiber A12, the aneroid capsule point
Cloth is placed and is connected in series by testing fiber A12, is connected with air pressure computing device A2, and the aneroid capsule surface is fixed with
Testing fiber on the optical fiber, for the aneroid capsule deformation data caused by air pressure to be measured to be converted into light-metering is treated
The strain signal light of fibre is simultaneously sent to barometer calculation device；Air pressure computing device A2, for receiving the strain of the testing fiber
Flashlight, based on the strain information, calculates and obtains atmospheric pressure value to be measured.
In another specific embodiment of the invention, a kind of air pressure measurement system, the distributed placement of each aneroid capsule
Position has height above sea level poor.
In another specific embodiment of the invention, a kind of air pressure measurement system A2, the air pressure computing device includes linear
Swept light source A21, stationary mirror A22, photodetector A23 and signal processing unit A24；The air pressure sensing device A1 leads to
Cross fiber coupler A25 to be connected with linear frequency sweep light source A21, stationary mirror A22 and photodetector A23 respectively, at signal
Reason unit A24 is connected with photodetector A23；The light Jing fiber coupler A25 that linear frequency sweep light source A21 sends are divided into two beams,
A branch of Jing stationary mirrors A22 is returned, and is returned after the testing fiber A12 refractions that another Shu Ze is entered in air pressure sensing device A1；
Fiber coupler A25 receives the light that stationary mirror A22 and optical fiber A12 is returned, and the smooth Jing photodetectors A23 is sent to
Signal processing unit A24；Signal processing unit A24 is used to be calculated atmospheric pressure value to be measured using the flashlight for receiving.
In another specific embodiment of the invention, a kind of air pressure measurement system, the aneroid capsule A11 and testing fiber
A12 is connected by the method for the fastening that sticks with glue, and the deformation quantity of aneroid capsule A11 is directly passed to testing fiber A12.
As shown in Fig. 2 in another specific embodiment of the invention, a kind of air pressure measurement system, each measurement point has one
The individual air pressure sense device A1 being composed in series by multiple aneroid capsule A11.Aneroid capsule A11 is a kind of by elastic metallic welding
Into inner chamber is the closing bellows of vacuum or micro-air state, and the flexibility in aneroid capsule elastic metallic face can be with the external world
The change of air pressure changes, therefore can be used as a kind of sense device of atmospheric pressure.For the series connection of multiple bellows, can be with
It is using metal tie rods A111, the two ends of connecting rod are solid with the elastic surface welding of two adjacent aneroid capsules respectively
It is fixed.
The effect of fixed frame is to fix multiple series connection bellows, and the deformation of bellows is delivered to distributing optical fiber sensing by realization
On the testing fiber of device.Fixed frame A112 is a framework being welded by tetra- metal coverings of A, B, C and D, wherein A, B and
Tri- faces of C are non-resilient metal covering, and D faces are elastic metallic face.The aneroid capsule of series connection is placed in the inside of fixed frame, by bellows
One end be fixed on the inner side of face B, the other end of bellows is fixed on the inner side of face D, testing fiber is attached to into the bullet of fixed structure
The outside of property metal covering D.In order to demarcate conveniently, when device is designed, by making the length of fixed frame internal series-connection is suitably larger than
The overall length of bellows, it is ensured that the elastic metallic face of fixed frame is in the range of normal atmosphere pressure all the time in aduncate
State, that is, aneroid capsule one end connecting rod of connecting is always pulling force to the right to the active force of elastic metallic face D.
In Fig. 3, in another specific embodiment of the invention, a kind of barometric surveying method overall procedure schematic diagram is shown.It is whole
For body, including step 1, the deformation produced because of air pressure is delivered to testing fiber by each aneroid capsule, and testing fiber will be described each
The deformation that aneroid capsule transmission comes is converted into strain signal；Step 2, based on the strain signal tested point air pressure is calculated
Value.
In another specific embodiment of the invention, a kind of barometric surveying method, the distributed fiberoptic sensor is to be based on
Probe beam deflation system (OFDR) is measuring the stress of each point on testing fiber.It utilizes cw frequency scanning technique, Jing couplings
Clutch is divided into two beams into Michelson's interferometer structure, and a branch of reflected mirror is returned, and its light path is fixed, is referred to as referred to
Light, another Shu Ze enters testing fiber, because optical fiber has the microinhomogeneities of refractive index, can produce Rayleigh scattering, wherein
Part rear orientation light meets fiber numerical aperture and returns towards injection end, referred to as flashlight, if spread length meets light
Coherent condition, then flashlight and reference light will be mixed on the photosurface of photodetector.Rayleigh scattering in optical fiber
Be by optical fiber refractive index change at random itself caused by, and scatter amplitude be measuring distance function.Due to depositing in optical fiber
In the property of this more stable random distribution, so optical fiber can be regarded as a kind of longer weak with random period and treat
Light-metering is fine.When the strain on testing fiber changes, the spectrum of the back rayleigh scattering signal of optical fiber will drift about,
The size of its drift value is directly proportional to the strain suffered by optical fiber.By being demodulated to spectral drift amount using computing cross-correlation,
Strain value can be just directly obtained, recycles Moving Window to be scanned each position of optical fiber, it is possible to while obtaining tested
The strain information of each position of optical fiber.
In another specific embodiment of the invention, a kind of barometric surveying method is described for each measurement point, works as air
When pressure increases, the pressure increase on outer bound pair aneroid capsule surface, the flexibility for making the elastic surface of aneroid capsule cave inward
Bigger, due to connecting, bellows low order end is connected on the non-resilient metal covering B of fixed frame, therefore the vertical central axis of each bellows
Line will be to right translation, and the high order end connecting rod of aneroid capsule of connecting is connected with elastic metallic face, and connecting rod is to elastic gold
The pulling force of category face D will increase, and the flexibility for causing D faces increases, therefore the strain of the testing fiber being pasted onto on D faces also can increase
Greatly.Conversely, when atmospheric pressure reduces, the pressure on outer bound pair bellows surface reduces, and the elastic surface for making aneroid capsule concaves
Sunken flexibility reduces, and ultimately resulting in the strain of testing fiber also can reduce.The purpose connected using multiple aneroid capsules is to put
The impact that change of atmospheric pressure is produced to fibre strain.Secondly, for distributed fiberoptic sensor, because its sensitivity is high, can
To detect the strain of two point of the testing fiber distance less than 1m simultaneously, therefore in signal demodulating end, each prison can be measured
The dependent variable of measuring point.The atmospheric pressure value and its correspondence position of each measurement point can be namely calculated.
In another specific embodiment of the invention, a kind of barometric surveying method, the step 1 also includes：Each aneroid capsule
In the distributed placement of same height above sea level.
In another specific embodiment of the invention, a kind of barometric surveying method, the step 1 also includes:Each aneroid capsule
The position of distributed placement has height above sea level poor.
In another specific embodiment of the invention, a kind of barometric surveying method, the step 2 also includes：Tested point air pressure
It is worth for the mean value of each aneroid capsule atmospheric pressure value.
In another specific embodiment of the invention, a kind of barometric surveying method, the step 2 also includes：Pa=
((Pa1+Pa2+......+Pan)/n+(Pb1+Pb2+......+Pbm- m (h/8))/m)/2, wherein PaFor tested point a atmospheric pressure values, an
For each point of the same height above sea levels of tested point a, bmIt is each point for having the poor h of height above sea level with tested point a.
In another specific embodiment of the invention, a kind of barometric surveying method can pass through the air pressure of each measurement point
Value and its corresponding locus calculate a certain height above sea level or the average gas pressure in certain region.For example, n is located at same sea
The measurement point of degree of lifting, the gas pressure measurement of this n point is respectively { P1, P2..., Pn, then can be by averaging, can be with
Calculate the atmospheric pressure at this height above sea levelIn the case where height above sea level is relatively low, for two measurement points A
With B, their difference in height is h, and atmospheric pressure value is respectively Pa、Pb, then can be according to atmospheric pressure and the relation of height above sea level：Height above sea level is every
Increase 8m, correspondence atmospheric pressure reduces 1hPa, and by the air pressure of A points estimate P of B point air pressure is calculatedb=Pa+ h/8, unit is
HPa, then by seeking PbWith P 'bThe final gas pressure measurement of mean value computation B point, it is also possible to pass through the atmospheric pressure value estimation A of B points
Point air pressure, verifies as reference value to A points measurement air pressure.
Finally, the present processes are only preferably embodiment, are not intended to limit protection scope of the present invention.It is all
Within the spirit and principles in the present invention, any modification, equivalent substitution and improvements made etc. should be included in the protection of the present invention
Within the scope of.
Claims (9)
1. a kind of air pressure measurement system, it is characterised in that including air pressure sensing device and air pressure computing device；
The air pressure sensing device, at least including two aneroid capsules and testing fiber, the aneroid capsule is distributed to be placed simultaneously
Connected by testing fiber, be connected with air pressure computing device, the aneroid capsule surface is fixed with the testing fiber, for inciting somebody to action
The aneroid capsule deformation data caused by air pressure to be measured is converted into the strain signal light of testing fiber and is sent to air pressure
Computing device；
The air pressure computing device, for receiving the strain signal light of the testing fiber, based on the strain information, calculating is obtained
Obtain atmospheric pressure value to be measured.
2. the system as claimed in claim 1, it is characterised in that there is height above sea level the position of the distributed placement of each aneroid capsule
Difference.
3. the system as claimed in claim 1, it is characterised in that the air pressure computing device includes linear frequency sweep light source, fixation
Speculum, photodetector and signal processing unit；The air pressure sensing device by fiber coupler respectively with linear frequency sweep
Light source, stationary mirror are connected with photodetector, and signal processing unit is connected with photodetector；Linear frequency sweep light source sends
Light Jing fiber couplers be divided into two beams, a branch of Jing stationary mirrors are returned, and another Shu Ze is returned after penetrating into testing fiber；Light
Fine coupler receives the light that stationary mirror and testing fiber are returned, and the light is sent to into photodetector Jing photodetectors
It is sent to signal processing unit；Signal processing unit is used to be calculated atmospheric pressure value to be measured using the flashlight for receiving.
4. the system as claimed in claim 1, it is characterised in that the aneroid capsule is with testing fiber by the fastening that sticks with glue
Method connection, the deformation quantity of aneroid capsule is directly passed to testing fiber.
5. a kind of barometric surveying method, it is characterised in that include：
The deformation produced because of air pressure is delivered to testing fiber by step 1, each aneroid capsule, and testing fiber is by each aneroid capsule
The deformation that transmission comes is converted into strain signal；
Step 2, based on the strain signal tested point atmospheric pressure value is calculated.
6. method as claimed in claim 5, it is characterised in that the step 1 also includes：Each aneroid capsule is in same height above sea level
Spend distributed placement.
7. method as claimed in claim 5, it is characterised in that the step 1 also includes:The distributed placement of each aneroid capsule
Position has height above sea level poor.
8. method as claimed in claim 6, it is characterised in that the step 2 also includes：Tested point atmospheric pressure value is each vacuum diaphragm
The mean value of box atmospheric pressure value.
9. method as claimed in claim 7, it is characterised in that the step 2 also includes：Pa=((Pa1+Pa2+......+
Pan)/n+(Pb1+Pb2+......+Pbm- m (h/8))/m)/2, wherein PaFor tested point a atmospheric pressure values, anFor the same seas of tested point a
The each point of degree of lifting, bmIt is each point for having the poor h of height above sea level with tested point a.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201611219227.0A CN106644245A (en) | 2016-12-26 | 2016-12-26 | Atmosphere pressure measurement system and air pressure measurement method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611219227.0A CN106644245A (en) | 2016-12-26 | 2016-12-26 | Atmosphere pressure measurement system and air pressure measurement method |
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| CN106644245A true CN106644245A (en) | 2017-05-10 |
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| CN201611219227.0A Pending CN106644245A (en) | 2016-12-26 | 2016-12-26 | Atmosphere pressure measurement system and air pressure measurement method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113252229A (en) * | 2021-07-15 | 2021-08-13 | 成都辰迈科技有限公司 | Non-static fluid pressure measuring device and using method thereof |
| CN115060411A (en) * | 2022-04-27 | 2022-09-16 | 上海化工研究院有限公司 | Atmospheric pressure change display device and method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103090813A (en) * | 2013-01-15 | 2013-05-08 | 电子科技大学 | High resolution sensing system measuring beat-length and strain of polarization maintaining optical fiber based on optical frequency domain reflectometer (OFDR) system |
| CN105606295A (en) * | 2015-12-23 | 2016-05-25 | 大连理工大学 | Distributed thin film pressure sensor based on optical fiber back Rayleigh scattering |
-
2016
- 2016-12-26 CN CN201611219227.0A patent/CN106644245A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103090813A (en) * | 2013-01-15 | 2013-05-08 | 电子科技大学 | High resolution sensing system measuring beat-length and strain of polarization maintaining optical fiber based on optical frequency domain reflectometer (OFDR) system |
| CN105606295A (en) * | 2015-12-23 | 2016-05-25 | 大连理工大学 | Distributed thin film pressure sensor based on optical fiber back Rayleigh scattering |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113252229A (en) * | 2021-07-15 | 2021-08-13 | 成都辰迈科技有限公司 | Non-static fluid pressure measuring device and using method thereof |
| CN115060411A (en) * | 2022-04-27 | 2022-09-16 | 上海化工研究院有限公司 | Atmospheric pressure change display device and method |
| CN115060411B (en) * | 2022-04-27 | 2024-04-30 | 上海化工研究院有限公司 | Display device and method for atmospheric pressure change |
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Application publication date: 20170510 |