CN102735390A - Grating sensor for measuring pressure and density - Google Patents
Grating sensor for measuring pressure and density Download PDFInfo
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- CN102735390A CN102735390A CN2011100813802A CN201110081380A CN102735390A CN 102735390 A CN102735390 A CN 102735390A CN 2011100813802 A CN2011100813802 A CN 2011100813802A CN 201110081380 A CN201110081380 A CN 201110081380A CN 102735390 A CN102735390 A CN 102735390A
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Abstract
The invention provides a grating sensor for measuring the pressure and the density of a gas, and specifically relates to an element for sensing the pressure and the density of the gas. The sensor comprises a spring body, a bellows, a bellows welding component, a sensing element support, adjusting screws, a housing, and two gratings. The basic implementation principle of the sensor is that the bellows is served as a sensing information source to pass pressure intensity information, the pressure intensity information is received by a sensing element and is converted into deformation information by the sensing element, and the deformation information is passed to the pressure measurement grating to change grating parameters, resulting in a shift in the reflection wavelength of the grating, and a pressure variation can be accurately obtained from a corresponding relationship between a wavelength variation and the pressure. The process is completed by the temperature measurement grating at the same time. The temperature measurement grating and the pressure measurement grating are serially stuck to the sensing element support. Then,corresponding density information at this moment can be obtained from the temperature information and the pressure intensity information.
Description
1 technical field
The present invention relates to a kind of gas sensor, it is used on the density and pressure of measurement gas.
2 background technologies
The gas sensing device of designing measurement gas density and pressure at present is a lot, and particularly some colleges and universities have a lot of scientific research projects to relate to measurement gas density and pressure aspect.Utilize single fiber or two optical fiber measurement, solved fiber grating cross sensitivity problem, realized temperature, discriminating measurement in the time of strain.Single FBG method mainly is to realize temperature compensation through fiber grating being carried out methods such as structural design encapsulation or negative thermal expansion material encapsulation, and then measures when realizing temperature, strain; And two FBG methods are two reflection Bragg wavelength to be monitored to measure when realizing temperature-insensitive measurement or temperature, strain simultaneously.In view of field of employment, environment, and the specific requirement of technology, much can not technical transform become to produce, caused technological waste to a certain extent.
3 summary of the invention
The present invention has designed a kind of measurement mechanism that is used to measure the SF6 gas density, and this apparatus structure installation testing is simple, practical.Guaranteed when gaseous tension and temperature have subtle change, to catch this information accurately, thereby discriminating measurement when accomplishing pressure and temperature fast, accurately further accurately changes into gas density information again.
Actual place, environment according to using the present invention includes following a few part:
A) (fix) spring body, shown among Fig. 11, join as the termination and the extraneous gas of this gas sensor, whole spring body comprises that cylindrical sides adds the part that links of external thread conduct and extraneous gas; The bolt shape coupling part, three radiuses are respectively R1, R2, the slice of cylinder 1 of R3; 2,3,4 parts, wherein radius is that the slice of cylinder of R2 is carved ring groove on disc; The external radius of groove is R4, and each several part is an one, the axis unification, and whole spring body has the cylinder bore of a central shaft for axle.R1＞R2＞R4＞R3. wherein
B) corrugated tube, shown among Fig. 12, what the present invention adopted is two ripple corrugated stainless steel tubings, and radius is R3, and this device is positioned on above-mentioned (fixing) spring body, and its lower end and spring body well join, so that gas to be measured is sealed in the corrugated tube fully.
C) corrugated tube weldment, shown among Fig. 13, this installs by four slice of cylinder 5,6,7,8, is followed successively by R3 from the bottom to top, R5, R6, the integrated connection of R7.Lower end cylinder 5 well joins with the corrugated tube upper end, so formed an airtight air chamber by spring body, corrugated tube and corrugated tube weldment, carries gas by the spring body hollow hole to this air chamber.Upper end right cylinder 8 with the disc diameter be datum line to downward quarter the degree of depth be the groove A of the height of slice of cylinder 8, become 90 degree places to carve a V-type groove with this groove simultaneously.
D) sensing unit, position shown among Fig. 14, its front is as shown in Figure 2, and 1 and 4 parts are used for fixing the placement set screw, and 2 parts are-u type groove, are used for pasting grating.
E) sensing unit support, shown among Fig. 15, this device is the cylindrical tube 9 of end sealing; External radius is R4; Cut about two parts of cylinder axis in the face of claiming along cylinder by blind end, staying width is the L part, not cut-out cylinder height for make among the figure 3 be exposed to outside.
F) set screw, as among Fig. 16, shown in 7,6 between corrugated tube weldment and sensing unit, because pressure influence and do small movements in the corrugated tube thereupon, 7 between sensing unit support and sensing unit support, fixedly the first support of sensing.
G) shell shown among Fig. 18, is the cylindrical drum of end sealing.
H) grating, quantity are two, the parameter basically identical, and serial connection is pasted on sensing unit, and another is pasted on sensing unit support.
4. description of drawings
Fig. 1 sensor sectional view
Fig. 2 sensing unit front elevation
Fig. 3 sensor side view
5. practical implementation method
Below according to accompanying drawing narration embodiments of the invention
Corrugated tube among the present invention is as the heat transfer agent source; Transmit pressure information; Receive this pressure information and be translated into deformation data by sensing unit, and between this deformation data, pass to grating grating parameter is changed, thereby cause the grating reflection wavelength to squint; From the corresponding relation of wavelength variable quantity and pressure, can know the situation of change of pressure accurately.The basic enforcement principle of Here it is this sensor.
Like Fig. 1, gas gets into corrugated tube from 1 hollow parts, and the pressure of this gas is 1MPa; At this moment gas pressure intensity acts on 4 positions of sensing unit 4 in the corrugated tube; According to pressure with the relation of pressure, sensing unit produces deformation, its deformation quantity is reflected to the two ends of pasting grating and is about 3000 μ ε.
For its λ of grating
b=2n
EffΛ is n wherein
EffBe effective refractive index, Λ is the grating cycle, and this deformation quantity causes n
Eff, variation, λ have taken place in Λ
bAlso change, we can be from λ thereupon
bVariation obtain the variation of gas pressure intensity.If the temperature of this moment is also known, just can (P T) learns density information by ρ=f.
So when using with the series connection of two gratings, can to since the temperature variation that environmental factor causes compensate, simultaneously, when the both when changing, wherein the wavelength change of a grating is because the variation of ambient temperature and measured pressure causes; The wavelength change of another grating only receives extraneous thermal effect, because temperature and pressure is an independent linearity for the variable quantity of grating wavelength, we can obtain the changing value of temperature and pressure from the wavelength variable quantity of two gratings like this.So just density information can have been obtained.
Claims (5)
1. raster pattern measurement gas pressure, the sensor of density comprises spring body, corrugated tube, corrugated tube weldment, sensing unit, sensing unit support, set screw, shell, grating.It is characterized in that according to the information direction of transfer, gas gets into corrugated tube as the heat transfer agent source by the spring body center, the corrugated tube weldment is connected sensing unit with set screw, receive this pressure information, deformation, and the grating reflection wavelength squints.
2. gas sensor as claimed in claim 1 is characterized in that, the structure that used sensing is first, and set screw connected mode.
3. gas sensor as claimed in claim 1 is characterized in that, uses the information source acquisition elements of corrugated tube as sensor.
4. grating as claimed in claim 1, quantity are two, the parameter basically identical, and a serial connection is pasted on sensing unit, and another is pasted on sensing unit support.
5. also belong to the claim scope with this sensor construction analog structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100813802A CN102735390A (en) | 2011-03-31 | 2011-03-31 | Grating sensor for measuring pressure and density |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100813802A CN102735390A (en) | 2011-03-31 | 2011-03-31 | Grating sensor for measuring pressure and density |
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| Publication Number | Publication Date |
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| CN102735390A true CN102735390A (en) | 2012-10-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011100813802A Pending CN102735390A (en) | 2011-03-31 | 2011-03-31 | Grating sensor for measuring pressure and density |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112198085A (en) * | 2020-10-09 | 2021-01-08 | 哈尔滨工程大学 | Liquid density measuring device based on side hole optical fiber and measuring method thereof |
-
2011
- 2011-03-31 CN CN2011100813802A patent/CN102735390A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112198085A (en) * | 2020-10-09 | 2021-01-08 | 哈尔滨工程大学 | Liquid density measuring device based on side hole optical fiber and measuring method thereof |
| CN112198085B (en) * | 2020-10-09 | 2022-03-18 | 哈尔滨工程大学 | Liquid density measuring device based on side hole optical fiber and measuring method thereof |
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Addressee: Zhang Dongbo Document name: Notification of Publication of the Application for Invention |
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| DD01 | Delivery of document by public notice |
Addressee: Zhang Dongbo Document name: Notification of before Expiration of Request of Examination as to Substance |
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Application publication date: 20121017 |