CN102359766A - Fiber body strain gauge - Google Patents
Fiber body strain gauge Download PDFInfo
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- CN102359766A CN102359766A CN2011102729953A CN201110272995A CN102359766A CN 102359766 A CN102359766 A CN 102359766A CN 2011102729953 A CN2011102729953 A CN 2011102729953A CN 201110272995 A CN201110272995 A CN 201110272995A CN 102359766 A CN102359766 A CN 102359766A
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- strain
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- strainmeter
- fiber body
- strain tube
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Abstract
The invention discloses a fiber body strain gauge which comprises that: a strain cylinder used for sensing body strain; liquid which is filled into the strain cylinder and is used for transmitting body strain sensed by the strain cylinder; a end cap used for carrying out sealing; a spring tube which is installed at a bottom of the strain cylinder and is used for sensing pressure change in the strain cylinder; a bolt which is installed at the bottom of the strain cylinder and is used for filling liquid and carrying out sealing; a fiber grating which is fixed at a bottom of the spring tube and the bottom of the strain cylinder and is used for measuring end displacement of the spring tube; a protective cover which is installed at the bottom of the strain cylinder and is used for protecting internal structures of the body strain gauge. By utilizing the invention, problems of electromagnetic interference, lightening proof and null shift of a present boring strain gauge are solved.
Description
Technical field
The present invention relates to the seismical technique field, relate in particular to a kind of fiber body strainmeter.
Background technology
Can deform at regional stress field action lower crust, borehole strain observation is a kind of important means that research diastrophe and stress field change.Drilling strain gauge can be with earthquake and volcanicity at that time and the crustal deformation of front and back, with minute in addition get off near the sampling time continuous recording of surveying shake.Therefore in earthquake forecast and geophysical research, play an important role.
Existing drilling strain gauge comprises body strain appearance and component type strainmeter (Qiu Zehua etc., " current situation of external borehole strain observation ", earthquake journal, 2004).No matter but which kind of strainmeter all adopts electric sensor to survey.FZY-1 type drilling strain gauge like China adopts capacitive transducer (Li Hailiang etc.; " design of many component types of FZY-1 type drilling strain gauge "; Earthquake geomagnetic observation and research, 2004), the mountain Nei Changsheng of Japan adopts electromagnetic sensor; The Wang Qimin of China proposed " string-frequency borehole strainmeter (one Chinese patent application CN86100074A), or the like.The drilling strain gauge of these electricity formulas all has identical shortcoming, and the first, can not resist thunderbolt, anti-electromagnetic interference (EMI); The second, can not solve drift problem (Qiu Zehua etc., " current situation of external borehole strain observation ", earthquake journal, 2004).
Fibre Optical Sensor is compared with corresponding conventional sensors, has remarkable advantages at aspects such as sensitivity, dynamic range, reliabilities, especially has anti-electromagnetic interference (EMI), is not afraid of the characteristics of thunderbolt, no drift.
Therefore, we propose a kind of fiber body strainmeter, are used for surveying in the earth strain of field of seismic exploration, and emphasis solves the electromagnetic interference (EMI) of existing drilling strain gauge, anti-thunderbolt, drift problem.
Summary of the invention
The technical matters that (one) will solve
In view of this, fundamental purpose of the present invention is to provide a kind of fiber body strainmeter, with the electromagnetic interference (EMI) that solves existing drilling strain gauge, anti-thunderbolt, drift problem.
(2) technical scheme
For achieving the above object, the invention provides a kind of fiber body strainmeter, comprising: strain tube 20 is used for the receptor strain; Be full of the liquid 50 in the strain tube 20, be used to transmit the body strain that strain tube 20 is experienced; End cap 10 is used for sealing; Be installed on the bourdon tube 40 of strain tube 20 bottoms, be used to experience the variation of strain tube 20 internal pressures; Be installed on the bolt 80 of strain tube 20 bottoms, be used for perfusion fluid 50 and sealing; Be fixed in the fiber grating 60 of bourdon tube 40 and strain tube 20 bottoms, be used for the end displacement of measuring spring pipe 40; Be installed on the protective cover 70 of strain tube 20 bottoms, be used for protective strainmeter inner structure.
In the such scheme, on the bottom 26 of said strain tube 20, further have first hole 21, be used for mounting spring pipe 40.
In the such scheme, liquid 50 UNICOMs in said bourdon tube 40 and the strain tube 20, the pressure variation that is used to measure liquid 50.
In the such scheme, on the bottom 26 of said strain tube 20, further have second hole 22, be used for erection bolt 80.
In the such scheme, further have hole 71 on the said protective cover 70, so that the tail optical fiber of fiber grating 60 is drawn.
In the such scheme, sidewall 25 rigidity of said strain tube 20 are less than the rigidity of bottom 26 and end cap 10.
In the such scheme, said fiber grating 40 has certain primary stress.
In the such scheme, a cylinder 30 is housed further in the said strain tube 20, is used to change the temperature characterisitic of fiber body strainmeter.
(3) beneficial effect
Can find out that from technique scheme the present invention has following beneficial effect:
1, this fiber body strainmeter provided by the invention does not have any electronic devices and components, anti-electromagnetic interference (EMI) in the down-hole.
2, this fiber body strainmeter provided by the invention connects subsurface equipment through optical cable, and optical cable can not have metal, so anti-thunderbolt.
3, this fiber body strainmeter provided by the invention adopts the light grating sensor of wavelength-modulated type, has reduced the drift problem of body strain appearance greatly.
Description of drawings
Fig. 1 is the synoptic diagram of fiber body strainmeter provided by the invention;
Fig. 2 is the synoptic diagram that fiber body strainmeter provided by the invention is installed in the down-hole.
Embodiment
For making the object of the invention, technical scheme and advantage clearer, below in conjunction with specific embodiment, and with reference to accompanying drawing, to further explain of the present invention.
Please with reference to Fig. 1-Fig. 2, fiber body strainmeter provided by the invention comprises: strain tube 20 is used for the receptor strain; Be full of the liquid 50 in the strain tube 20, be used to transmit the body strain that strain tube 20 is experienced; End cap 10 is used for sealing; Be installed on the bourdon tube 40 of strain tube 20 bottoms, be used to experience the variation of strain tube 20 internal pressures; Be installed on the bolt 80 of strain tube 20 bottoms, be used for perfusion fluid 50 and sealing; Be fixed in the fiber grating 60 of bourdon tube 40 and strain tube 20 bottoms, be used for the end displacement of measuring spring pipe 40; Be installed on the protective cover 70 of strain tube 20 bottoms, be used for protective strainmeter inner structure.
On the bottom 26 of strain tube 20, further have first hole 21, be used for mounting spring pipe 40, liquid 50 UNICOMs in bourdon tube 40 and the strain tube 20, the pressure variation that is used to measure liquid 50.On the bottom 26 of strain tube 20, further have second hole 22, be used for erection bolt 80.Further have hole 71 on the protective cover 70, so that the tail optical fiber of fiber grating 60 is drawn.Sidewall 25 rigidity of strain tube 20 are less than the bottom 26 of (or much smaller than) strain tube 20 and the rigidity of end cap 10.Fiber grating 40 has certain primary stress.
One cylinder 30 further is housed in the strain tube 20, is used to change the temperature characterisitic of fiber body strainmeter.Cylinder 30 can be installed on the end cap 10.Volume reduces liquid 50 in the strain tube 20 owing to the existence of cylinder 30.The temperature expansion coefficient of cylinder 30 is less than (or much smaller than) liquid 50, and when fiber body strainmeter environment temperature of living in changed, the pressure that liquid 50 is caused by temperature expansion changed and will reduce greatly.
The principle of work of fiber body strainmeter provided by the invention does; After drilling strain gauge put into the down-hole,, the sleeve pipe 91 of fiber body strainmeter and well is combined closely through casting cement mortar 92; When changing, earth's crust stress makes in the rock stratum when strain takes place; Make the sidewall generation deformation of strain tube 20, thereby cause the pressure of liquid 50 to change, and then the end of bourdon tube 40 is subjected to displacement.Therefore be fixed in the end of bourdon tube 40 and the fiber grating 60 of strain tube 20 bottoms 26 and produce strain, thereby output wavelength changes.Thereby detect wavelength change through demodulated equipment and demodulate the earth strain signal.
Above-described specific embodiment; The object of the invention, technical scheme and beneficial effect have been carried out further explain, and institute it should be understood that the above is merely specific embodiment of the present invention; Be not limited to the present invention; All within spirit of the present invention and principle, any modification of being made, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. a fiber body strainmeter is characterized in that, comprising:
Strain tube (20) is used for the receptor strain;
Be full of the liquid (50) in the strain tube (20), be used to transmit the body strain that strain tube (20) is experienced;
End cap (10) is used for sealing;
Be installed on the bourdon tube (40) of strain tube (20) bottom, be used to experience the variation of strain tube (20) internal pressure;
Be installed on the bolt (80) of strain tube (20) bottom, be used for perfusion fluid (50) and sealing;
Be fixed in the fiber grating (60) of bourdon tube (40) and strain tube (20) bottom, be used for the end displacement of measuring spring pipe (40);
Be installed on the protective cover (70) of strain tube (20) bottom, be used for protective strainmeter inner structure.
2. fiber body strainmeter according to claim 1 is characterized in that, on the bottom (26) of said strain tube (20), further has first hole (21), is used for mounting spring pipe (40).
3. fiber body strainmeter according to claim 1 is characterized in that, said bourdon tube (40) and interior liquid (50) UNICOM of strain tube (20), the pressure variation that is used to measure liquid (50).
4. fiber body strainmeter according to claim 1 is characterized in that, on the bottom (26) of said strain tube (20), further has second hole (22), is used for erection bolt (80).
5. fiber body strainmeter according to claim 1 is characterized in that, further has hole (71) on the said protective cover (70), so that the tail optical fiber of fiber grating (60) is drawn.
6. fiber body strainmeter according to claim 1 is characterized in that, sidewall (25) rigidity of said strain tube (20) is less than the rigidity of bottom (26) and end cap (10).
7. fiber body strainmeter according to claim 1 is characterized in that, said fiber grating (40) has certain primary stress.
8. fiber body strainmeter according to claim 1 is characterized in that, a cylinder (30) further is housed in the said strain tube (20), is used to change the temperature characterisitic of fiber body strainmeter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110272995 CN102359766B (en) | 2011-09-15 | 2011-09-15 | Fiber body strain gauge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110272995 CN102359766B (en) | 2011-09-15 | 2011-09-15 | Fiber body strain gauge |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102359766A true CN102359766A (en) | 2012-02-22 |
| CN102359766B CN102359766B (en) | 2013-06-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110272995 Active CN102359766B (en) | 2011-09-15 | 2011-09-15 | Fiber body strain gauge |
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| Country | Link |
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| CN (1) | CN102359766B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2676143Y (en) * | 2003-11-10 | 2005-02-02 | 池顺良 | Multi component isoplanar radial displacement type boring strain gauge |
| CN1746644A (en) * | 2005-09-30 | 2006-03-15 | 合肥工业大学 | Pressure sensor in deep-sea and use thereof |
| CN101280690A (en) * | 2008-03-14 | 2008-10-08 | 山东省科学院激光研究所 | Pressure sensor |
-
2011
- 2011-09-15 CN CN 201110272995 patent/CN102359766B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2676143Y (en) * | 2003-11-10 | 2005-02-02 | 池顺良 | Multi component isoplanar radial displacement type boring strain gauge |
| CN1746644A (en) * | 2005-09-30 | 2006-03-15 | 合肥工业大学 | Pressure sensor in deep-sea and use thereof |
| CN101280690A (en) * | 2008-03-14 | 2008-10-08 | 山东省科学院激光研究所 | Pressure sensor |
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| Publication number | Publication date |
|---|---|
| CN102359766B (en) | 2013-06-26 |
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