CN211452304U - Fiber grating settlement gauge - Google Patents
Fiber grating settlement gauge Download PDFInfo
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- CN211452304U CN211452304U CN202020471205.9U CN202020471205U CN211452304U CN 211452304 U CN211452304 U CN 211452304U CN 202020471205 U CN202020471205 U CN 202020471205U CN 211452304 U CN211452304 U CN 211452304U
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Abstract
The invention provides a fiber bragg grating settlement gauge, which relates to the field of settlement monitoring and comprises a shell, wherein the shell comprises a cavity, a diaphragm is arranged in the cavity, the diaphragm divides the cavity into a first cavity and a second cavity which are vertically distributed, a stress fiber bragg grating and a temperature compensation fiber bragg grating which are mutually connected are arranged in the first cavity, one end of the stress fiber bragg grating is connected with the diaphragm, and the other end of the stress fiber bragg grating is connected with an optical cable; the second cavity is provided with a liquid inlet and a liquid outlet which are communicated with the inside and are used for being communicated with an external liquid level pool to obtain hydraulic pressure; the diaphragm is used for deforming under the action of hydraulic pressure in the second cavity, so that the stress state of the stress fiber grating is changed, the stress fiber grating is arranged in the cavity, the temperature compensation fiber grating is configured, the temperature compensation is carried out on the monitoring process of the stress fiber grating, the through hole is arranged to be communicated with the inside and the outside of the cavity, the air pressure in the cavity is always kept consistent with the outside, and the noise influence caused by the change of the air pressure due to the influence of the temperature is avoided.
Description
Technical Field
The disclosure relates to the field of settlement monitoring, in particular to a fiber grating settlement gauge.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
Stratum settlement refers to a geological phenomenon that a horizontal plane is reduced in a certain ground area, and mainly occurs in a high-density residential area of a dense urban area with high economy; the stratum settlement is a slow and long-term evolution and development process, becomes a geological disaster in severe cases, and threatens the safety of lives and properties of people.
The inventor finds that the settlement measurement is mostly carried out by adopting the fiber bragg grating sensor at present, the fiber bragg grating sensor is small in size, corrosion-resistant, anti-electromagnetic interference and capable of enduring severe environment in the stratum settlement monitoring process; however, the fiber bragg grating is sensitive to strain and temperature at the same time, and the cross sensitivity problem is easily caused in the sensing process, so that more noise is generated when the settlement is measured; in addition, because the stratum settlement monitoring needs to be carried out for a long time, the air pressure in the settlement gauge can change along with the change of the temperature in the time period, and for a settlement system which carries out monitoring by changing the hydraulic value through the liquid level difference, the monitoring of the hydraulic value can be interfered by the change of the air pressure, the precision of the monitoring process is influenced, and the precision requirement on the stratum settlement monitoring is difficult to meet.
SUMMERY OF THE UTILITY MODEL
The utility model aims at the defect that prior art exists, provide a fiber grating settlement appearance, with stress fiber grating arrange the cavity in to dispose temperature compensation fiber grating, carry out temperature compensation to stress fiber grating monitoring process, and set up the through-hole and communicate the cavity inside and outside, make the inside atmospheric pressure of cavity keep unanimous with the external world all the time, avoid the noise influence that the atmospheric pressure change leads to of temperature influence.
In order to realize the purpose, the following technical scheme is adopted:
the fiber bragg grating temperature compensation device comprises a shell, wherein the shell comprises a cavity, a diaphragm is arranged in the cavity, the diaphragm divides the cavity into a first cavity and a second cavity which are distributed up and down, a stress fiber bragg grating and a temperature compensation fiber bragg grating which are mutually connected are arranged in the first cavity, one end of the stress fiber bragg grating is connected with the diaphragm, and the other end of the stress fiber bragg grating is connected with an optical cable; the second cavity is provided with a liquid inlet and a liquid outlet which are communicated with the inside and are used for being communicated with an external liquid level pool to obtain hydraulic pressure; the diaphragm is used for deforming under the action of hydraulic pressure in the second cavity, so that the stress state of the stress fiber grating is changed.
Furthermore, a through hole is formed in the shell and used for communicating the first cavity with the external environment.
Furthermore, a sleeve is wrapped outside one end of the stress fiber grating, and the top end of the stress fiber grating is connected with the shell through the sleeve.
Furthermore, one end, far away from the sleeve, of the stress fiber grating is connected with the diaphragm through a capillary tube, and the capillary tube obtains deformation of the diaphragm and transmits the deformation to the stress fiber grating.
Furthermore, the diaphragm is a metal diaphragm, and the capillary is connected with the center of the metal diaphragm.
Furthermore, the shell comprises a supporting cylinder, a sealing cover is matched with the top of the supporting cylinder, and one end, far away from the diaphragm, of the stress fiber grating is connected to the sealing cover.
Further, the diaphragm is coaxially arranged inside the supporting cylinder, the stress fiber grating and the axis of the supporting cylinder are arranged in a collinear manner, and the diaphragm and the sealing cover are matched with the inner wall of the supporting cylinder to jointly form a first cavity.
Further, the bottom end of the supporting cylinder is matched with a base, a second cavity is formed inside the supporting cylinder in a matching mode of the diaphragm and the base, and the second cavity is used for containing liquid input from the liquid inlet.
Further, the temperature compensation fiber grating is arranged in the first cavity and used for performing temperature compensation on the stress fiber grating.
Furthermore, the optical cable is an armored optical cable and is used for transmitting data measured by the stress fiber bragg grating to a fiber bragg grating demodulator.
Compared with the prior art, the utility model has the advantages and positive effects that:
(1) the accuracy of the sensor in different air pressure and temperature environments is kept by adding the vent hole and the temperature compensation fiber bragg grating, and meanwhile, the deformation quantity of the hydraulic pressure acting on the diaphragm directly acts on the stress fiber bragg grating through a new structure, so that the sensitivity and the range of the sensor are increased, and the wide-range and high-precision measurement is realized;
(2) adopt diaphragm structure cooperation capillary, the capillary configuration is put at the central point of diaphragm, guarantees that the hydraulic pressure change in the second cavity can be acquireed by the diaphragm, and the deformation that the diaphragm produced can be more accurate transmits to stress fiber grating structure to guarantee settlement monitoring's precision.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and are not to limit the disclosure.
Fig. 1 is a schematic view of the internal structure of a settlement meter in embodiments 1 and 2 of the present disclosure;
fig. 2 is an appearance structure schematic diagram of a settlement meter in embodiments 1 and 2 of the present disclosure.
In the figure, 1, a stainless steel sleeve, 2, a slotted capillary, 3, a stress fiber grating, 4, a temperature compensation fiber grating, 5, a metal membrane, 6, a liquid inlet, 7, a liquid outlet, 8, a fixing hole, 9, a base, 10, a sealing cover, 11, an optical cable, 12, an air vent, 13 and a shell.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present disclosure. As used herein, the singular forms "a", "an", and/or "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof;
for convenience of description, the words "up", "down", "left" and "right" in this disclosure, if any, merely indicate that the directions of movement are consistent with those of the figures themselves, and are not limiting in structure, but merely facilitate the description of the invention and simplify the description, rather than indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present disclosure.
As introduced in the background art, the fiber bragg grating in the prior art is sensitive to both strain and temperature, and easily causes a cross-sensitivity problem in a sensing process, resulting in more noise generated when measuring the sedimentation amount; in addition, because stratum settlement monitoring needs to be carried out for a long time and continuously measured, in this time quantum, along with the change of temperature, the inside atmospheric pressure of settlement gauge also can change along with it, to the settlement system that monitors through liquid level difference change hydraulic pressure value, the monitoring of hydraulic pressure value can be disturbed in the change of atmospheric pressure, influences the precision of monitoring process, to above-mentioned problem, this disclosure provides a fiber grating settlement gauge.
Example 1
In an exemplary embodiment of the present disclosure, as shown in fig. 1 and 2, a fiber grating settlement gauge is provided.
The device mainly comprises a stainless steel sleeve 1, a slotted capillary 2, a stress fiber grating 3, a temperature compensation fiber grating 4, a metal diaphragm 5, a liquid inlet 6, a liquid outlet 7, a fixing hole 8, a base 9, a sealing cover 10, an armored optical cable 11, an air vent 12 and a shell 13;
as shown in fig. 1, the housing is a shell 13 structure of the whole device, the housing includes a supporting cylinder, a sealing cover is fitted on the top of the supporting cylinder, and one end of the stress fiber grating far away from the diaphragm is connected to the sealing cover;
a cavity is formed in the shell, and the diaphragm is arranged in the cavity, so that the cavity is divided into a first cavity and a second cavity which are distributed up and down;
the diaphragm is coaxially arranged in the supporting cylinder, the stress fiber grating and the axis of the supporting cylinder are arranged in a collinear way, and the diaphragm and the sealing cover are matched with the inner wall of the supporting cylinder to form a first cavity together;
the bottom end of the supporting cylinder is matched with the base, the diaphragm and the base are matched with the inside of the supporting cylinder to jointly form a second cavity, and the second cavity is used for containing liquid input from the liquid inlet;
the stress fiber bragg grating and the temperature compensation fiber bragg grating which are connected with each other are arranged in the first cavity, one end of the stress fiber bragg grating is connected with the diaphragm, and the other end of the stress fiber bragg grating is connected with the optical cable;
the second cavity is provided with a liquid inlet and a liquid outlet which are communicated with the inside and are used for being communicated with an external liquid level pool to obtain hydraulic pressure; the diaphragm is used for deforming under the action of hydraulic pressure in the second cavity, so that the stress state of the stress fiber grating is changed.
The outer part of one end of the stress fiber grating is wrapped with a sleeve, and the top end of the stress fiber grating is connected with the shell through the sleeve; in the embodiment, the sleeve is a stainless steel sleeve 1, and the stainless steel sleeve is fixed on a sealing cover at the top of the shell;
one end, far away from the sleeve, of the stress fiber grating is connected with the diaphragm through the capillary, and the capillary acquires deformation of the diaphragm and transmits the deformation to the stress fiber grating. The capillary tube is a slotted capillary tube.
The slotted capillary is mainly used for connecting the stress fiber grating and the metal membrane and transmitting hydraulic pressure applied to the metal membrane to the stress fiber grating;
in this example, a stainless steel sleeve 15mm in diameter and 25mm in length was used, and fixed with epoxy 353ND, and a slotted capillary 2mm in diameter and 15mm in length was welded to the center of the metal diaphragm to form a central core, and epoxy 353ND was used for fixing.
The diaphragm is a metal diaphragm, and the capillary tube is connected with the center of the metal diaphragm;
the metal membrane is mainly used for measuring hydraulic pressure, when the hydraulic pressure on the membrane changes, the stress and deformation quantity on the metal membrane also change, and the stress and deformation quantity is transmitted to the stress fiber grating through the grooved capillary;
in this embodiment, a beryllium copper sheet with a diameter of 30mm and a thickness of 0.2mm is used as the metal diaphragm, and the joint of the metal diaphragm and the shell is welded by laser sealing.
The stress fiber grating is mainly used for measuring the hydraulic pressure applied to the metal membrane, so that the real-time measurement of the settlement amount is realized; when the stress fiber grating is measured, the stress fiber grating is always kept in a stressed state, and when the hydraulic pressure applied to the metal membrane is changed, the stressed state of the stress fiber grating is also changed.
In this embodiment, the stress fiber grating is a fiber bragg grating.
The temperature compensation fiber grating is mainly used for carrying out temperature compensation on the stress fiber grating, and the test data result is not influenced by temperature change; the temperature light-filling fiber grating is always in an unstressed state during measurement.
The shell is provided with a through hole for communicating the first cavity with the external environment;
the internal air pressure of the settlement gauge is kept consistent with the external atmospheric pressure, and the measurement error caused by the change of the atmospheric pressure is eliminated; the diameter of the vent hole is 2mm in this embodiment.
The liquid inlet is mainly used for connecting a low-temperature-resistant PVC steel wire hose to form a closed cavity so that liquid enters the settlement gauge; the inlet corresponds to the cavity to be measured and the reference cavity;
in this embodiment, the connection is fixed and sealed by using a stainless steel cable tie and epoxy resin adhesive 353ND, so as to ensure non-detachment and sealing.
The liquid outlet is mainly used for connecting a low-temperature-resistant PVC steel wire hose to enable liquid to flow out of the settlement gauge or is used for connecting a sealing plug to form a closed cavity; the outlet of the cavity to be measured and the outlet of the reference cavity correspond to the outlet of the cavity to be measured and the outlet of the reference cavity;
in this embodiment, the connection is fixed and sealed by using a stainless steel cable tie and epoxy resin adhesive 353ND, so as to ensure non-detachment and sealing.
The base is provided with a fixing hole which is mainly used for fixing the base of the settlement gauge on a point to be measured or a base to play a role in fixed connection; in the present embodiment, the specification of the fixing hole is M5.
The base is mainly used for connecting the settlement gauge with a point or a base to be measured; in this example, circular stainless steel having a diameter of 10cm and a thickness of 8mm was used as the base.
The sealing cover is mainly used for fixing the stainless steel sleeve and connecting the shell to protect the internal structure of the settlement gauge;
in this embodiment, the epoxy adhesive 353ND is used for the fixing and packaging.
The armored optical cable is mainly used for connecting the fiber bragg grating in the settlement gauge to ensure smooth light path;
in this embodiment, the armored cable uses an outdoor cable having a diameter of 7 mm.
The shell is mainly used for connecting the metal diaphragm and the sealing cover to form a whole and protect the internal structure;
in this example, a stainless steel housing having an inner diameter of 3cm and an outer diameter of 5cm and a length of 1cm was used.
Through increasing air vent, temperature compensation fiber grating, keep sensor measuring accuracy when different atmospheric pressure and temperature environment, through the deformation volume direct action stress fiber grating that new structure acted on the diaphragm with hydraulic pressure simultaneously, increased sensor sensitivity and range, realize wide-range, high accuracy measurement.
The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
Claims (10)
1. The fiber bragg grating settlement gauge is characterized by comprising a shell, wherein the shell comprises a cavity, a diaphragm is arranged in the cavity, the diaphragm divides the cavity into a first cavity and a second cavity which are distributed up and down, a stress fiber bragg grating and a temperature compensation fiber bragg grating which are mutually connected are arranged in the first cavity, one end of the stress fiber bragg grating is connected with the diaphragm, and the other end of the stress fiber bragg grating is connected with an optical cable; the second cavity is provided with a liquid inlet and a liquid outlet which are communicated with the inside and are used for being communicated with an external liquid level pool to obtain hydraulic pressure; the diaphragm is used for deforming under the action of hydraulic pressure in the second cavity, so that the stress state of the stress fiber grating is changed.
2. The fiber grating settlement gauge of claim 1, wherein the housing has a through hole for communicating the first cavity with an external environment.
3. The fiber grating settlement gauge of claim 1, wherein a sleeve is wrapped outside one end of the stress fiber grating, and the top end of the stress fiber grating is connected with the housing through the sleeve.
4. The fiber grating settlement gauge of claim 3, wherein the end of the stress fiber grating away from the sleeve is connected to the diaphragm through a capillary, and the capillary acquires the deformation of the diaphragm and transmits the deformation to the stress fiber grating.
5. The fiber grating settlement gauge of claim 4, wherein the diaphragm is a metal diaphragm, and the capillary is connected to the center of the metal diaphragm.
6. The fiber grating settlement gauge of claim 1, wherein the housing comprises a support cylinder, a sealing cover is fitted on the top of the support cylinder, and one end of the stress fiber grating, which is far away from the diaphragm, is connected to the sealing cover.
7. The fiber grating settlement gauge of claim 6, wherein the diaphragm is coaxially mounted inside the support cylinder, the stress fiber grating is arranged in line with an axis of the support cylinder, and the diaphragm and the cover cooperate with an inner wall of the support cylinder to form the first cavity.
8. The fiber grating settlement gauge of claim 7, wherein the bottom end of the supporting cylinder is engaged with a base, and the diaphragm and the base are engaged with the inside of the supporting cylinder to form a second cavity for containing the liquid inputted from the liquid inlet.
9. The fiber grating settlement gauge of claim 1, wherein the temperature compensated fiber grating is disposed in the first cavity for temperature compensation of the stressed fiber grating.
10. The fiber grating settlement gauge of claim 1, wherein the optical cable is an armored cable for transmitting data measured by the stress fiber grating to the fiber grating demodulator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020471205.9U CN211452304U (en) | 2020-04-02 | 2020-04-02 | Fiber grating settlement gauge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020471205.9U CN211452304U (en) | 2020-04-02 | 2020-04-02 | Fiber grating settlement gauge |
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| Publication Number | Publication Date |
|---|---|
| CN211452304U true CN211452304U (en) | 2020-09-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020471205.9U Active CN211452304U (en) | 2020-04-02 | 2020-04-02 | Fiber grating settlement gauge |
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| CN (1) | CN211452304U (en) |
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