CN102359765A - Component-type optical fiber drilling deformeter - Google Patents
Component-type optical fiber drilling deformeter Download PDFInfo
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- CN102359765A CN102359765A CN2011102723891A CN201110272389A CN102359765A CN 102359765 A CN102359765 A CN 102359765A CN 2011102723891 A CN2011102723891 A CN 2011102723891A CN 201110272389 A CN201110272389 A CN 201110272389A CN 102359765 A CN102359765 A CN 102359765A
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Abstract
The invention discloses a component-type optical fiber drilling deformeter which comprises a strain cylinder, an end cover, at least one bent beam, at least one measuring optical grating, a top cover, an optical cable and a ground demodulating device; the strain cylinder is used for receiving a strain; the end cover is arranged at one end of the strain cylinder and used for sealing; the at least one bent beam is arranged in the internal part of the strain cylinder and used for changing the deformation of the strain cylinder into an axial displacement; the at least one measuring optical grating is fixed between the middle part of the bent beam and the end cover and used for measuring the strain; the top end is arranged at the other end of the strain cylinder and used for protecting the internal part of the component-type optical fiber drilling deformeter and sealing; the optical cable is used for connecting the component-type optical fiber drilling deformeter arranged at the bottom of a well and the ground demodulating device; and the ground demodulating device is used for demodulating and measuring the wavelength change of the grating to obtain the ground strain value. With the adoption of the deformeter provided by the invention, the problems of electromagnetic interference, lightning resistance, null shift and the like in the existing drilling deformeter can be solved.
Description
Technical field
The present invention relates to the seismical technique field, relate in particular to a kind of component type optical fiber drilling strain gauge.
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 has proposed " string-frequency borehole strainmeter (one Chinese patent application CN86100074A) ", suitable good " the many components isoplanar radial displacement formula drilling strain gauge (Chinese patent 200320103157.4) " that proposes in pond, 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, drift problem serious (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, the present invention proposes a kind of component type optical fiber drilling strain gauge, is 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 component type optical fiber drilling strain gauge, with problems such as the electromagnetic interference (EMI) that solves existing drilling strain gauge, anti-thunderbolt, drifts.
(2) technical scheme
For achieving the above object, the invention provides a kind of component type optical fiber drilling strain gauge, comprising: strain tube 20 is used to experience strain; Be installed on the end cap 10 of strain tube 20 1 ends, be used for sealing; Be no less than one the bent type beam 60 that is installed on strain tube 20 inside, be used for the deformation of strain tube 20 is transformed into axial displacement; Be no less than the middle part of the bent type beam 60 of one be fixed in and the measurement grating 40 between the end cap 10, be used to measure strain; Be installed on the top cover 50 of strain tube 20 other ends, be used to protect the inner structure and the sealing of component type optical fiber drilling strain gauge; Optical cable 41 is used to be connected and installed in the component type optical fiber drilling strain gauge and the ground demodulated equipment 90 in shaft bottom; Ground demodulated equipment 90 is used for the wavelength change that grating 40 is measured in demodulation, thereby obtains the earth strain value.
In the such scheme, said bent type beam 60 with measure grating 40 mounted in pairs, and be generally three pairs and be mutually certain angle, be used to measure the strain of each component.
In the such scheme, on the said end cap 10 boss 11 is installed further, so that measure installing and fixing of grating 40.
In the such scheme, the sidewall rigidity of said strain tube 20 is less than the rigidity of end cap 10 or top cover 50.
In the such scheme, said measurement grating 40 has certain primary stress.
In the such scheme, further have hole 51 on the said top cover 50, the tail optical fiber of being convenient to measure grating 40 is drawn.
In the such scheme, the two ends of said bent type beam 60 closely contact with the inwall of strain tube 20.
In the such scheme, a temperature compensation grating 45 is installed further in the said strain tube 20, is used to carry out temperature compensation.
In the such scheme, said temperature compensation grating 45 is fixed in strain tube 20 inwalls through screw 22, makes temperature compensation grating 45 be in the stress free state, thereby carries out temperature compensation.
(3) beneficial effect
Can find out that from technique scheme the present invention has following beneficial effect:
1, this component type optical fiber drilling strain gauge provided by the invention does not have any electronic devices and components, anti-electromagnetic interference (EMI) in the down-hole.
2, this component type optical fiber drilling strain gauge provided by the invention connects subsurface equipment through optical cable, and optical cable can not have metal, so anti-thunderbolt.
3, this component type optical fiber drilling strain gauge provided by the invention adopts the light grating sensor of wavelength-modulated type, has reduced the drift problem of drilling strain gauge.
Description of drawings
Fig. 1 is the synoptic diagram of component type optical fiber drilling strain gauge provided by the invention;
Fig. 2 is the schematic cross-section of component type optical fiber drilling strain gauge provided by the invention;
Fig. 3 is the schematic cross-section of another kind of mounting means of the bent type beam 60 of component type optical fiber drilling strain gauge provided by the invention;
Fig. 4 is the synoptic diagram that component type optical fiber drilling strain gauge 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. 4; Wherein Fig. 1 is the synoptic diagram of component type optical fiber drilling strain gauge provided by the invention; Fig. 2 is the schematic cross-section of component type optical fiber drilling strain gauge provided by the invention; Fig. 3 is the schematic cross-section of another kind of mounting means of the bent type beam 60 of component type optical fiber drilling strain gauge provided by the invention, and Fig. 4 is the synoptic diagram that component type optical fiber drilling strain gauge provided by the invention is installed in the down-hole.
Component type optical fiber drilling strain gauge provided by the invention comprises: strain tube 20 is used to experience strain; End cap 10 is used for sealing; Be no less than one the bent type beam 60 that is installed on strain tube 20 inside, be used for the deformation of strain tube 20 is transformed into axial displacement; Be no less than the middle part of the bent type beam 60 of one be fixed in and the measurement grating 40 between the end cap 10, be used to measure strain; Top cover 50 is used to protect the inner structure and the sealing of component type optical fiber drilling strain gauge; Optical cable 41 is used to be connected and installed in the component type optical fiber drilling strain gauge and the ground demodulated equipment 90 in shaft bottom; Ground demodulated equipment 90 is used for the wavelength change that grating 40 is measured in demodulation, thereby obtains the earth strain value.
The two ends of bent type beam 60 closely contact with the inwall of strain tube 20, and its mounting means can be fixed on bent type beam 60 through bolt the inwall of strain tube 20 on the inwall of strain tube 20, opening a threaded hole 21.Bent type beam 60 with measure grating 40 mounted in pairs, and be generally three pairs and be mutually certain angle, be used to measure the strain of each component.Its typical mounting means has two kinds: a kind of is that three bent type beams 60 are mutually 120 degree angles installations (Fig. 2); Another kind is two orthogonal installations in three bent type beams 60, and another one becomes miter angle that (Fig. 3) is installed respectively with preceding two.On the end cap 10 boss 11 can be installed further, install and fix so that measure grating 40, the installation method of measuring grating 40 is generally bonding.The sidewall rigidity of strain tube 20 is less than the rigidity of (or much smaller than) end cap 10 and top cover 50, to guarantee that enough deflections are arranged under the terrestrial stress effect.Measure grating 40 and have certain primary stress, make it both to detect normal strain and also can detect negative strain.Can further have hole 51 on the top cover 50, the tail optical fiber of being convenient to measure grating 40 is drawn with optical cable 41 and is linked to each other.
The principle of work of component type optical fiber drilling strain gauge provided by the invention does, with reference to figure 1 and Fig. 4, with end cap 10, strain tube 20, bent type beam 60, measure grating 40, top cover 50 etc. and assemble after, the tail optical fiber of measuring grating 40 is drawn with optical cable 41 through hole 51 and is linked to each other.After drilling strain gauge 100 put into the down-hole; Through casting cement mortar 92, the component type optical fiber drilling strain gauge 100 and the sleeve pipe 91 of well are combined closely, when changing, earth's crust stress makes when in the rock stratum strain taking place; Make the sidewall generation deformation of strain tube 20; The bent type beam 60 of three different directions can be experienced the strain of different directions respectively, and causes that strain takes place the measurement grating 40 on the fixing bent type beam 60, thereby the output wavelength of measuring grating 40 changes.Light signal is transferred to the demodulated equipment 90 on ground through optical cable 41, thereby demodulates the earth strain signal through the wavelength change of demodulated equipment 90 detection measurement gratings 40.
In addition, can a temperature compensation grating 45 be installed in strain tube 20 further, temperature compensation grating 45 is fixed in strain tube 20 inwalls through screw 22, makes temperature compensation grating 45 be in the stress free state, thereby carries out temperature compensation.
Need to prove that for wavelength-modulated type Fibre Optical Sensor, sensitive element is not limited to fiber grating, promptly measure grating 60 and can be obtained same effect, other device such as fiber laser, long-period gratings, chirp grating etc. by other device replacement.
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 (9)
1. a component type optical fiber drilling strain gauge is characterized in that, comprising:
Strain tube (20) is used to experience strain;
Be installed on the end cap (10) of strain tube (20) one ends, be used for sealing;
Be no less than one the bent type beam (60) that is installed on strain tube (20) inside, be used for the deformation of strain tube (20) is transformed into axial displacement;
Be no less than the middle part of the bent type beam of one be fixed in (60) and the measurement grating (40) between the end cap (10), be used to measure strain;
Be installed on the top cover (50) of strain tube (20) other end, be used to protect the inner structure and the sealing of component type optical fiber drilling strain gauge;
Optical cable (41) is used to be connected and installed in the component type optical fiber drilling strain gauge and the ground demodulated equipment (90) in shaft bottom;
Ground demodulated equipment (90) is used for the wavelength change that grating (40) is measured in demodulation, thereby obtains the earth strain value.
2. component type optical fiber drilling strain gauge according to claim 1 is characterized in that, said bent type beam (60) and measure grating (40) mounted in pairs, and be generally three pairs and be mutually certain angle, be used to measure the strain of each component.
3. component type optical fiber drilling strain gauge according to claim 1 is characterized in that, boss (11) further is installed on the said end cap (10), so that measure installing and fixing of grating (40).
4. component type optical fiber drilling strain gauge according to claim 1 is characterized in that, the sidewall rigidity of said strain tube (20) is less than the rigidity of end cap (10) or top cover (50).
5. component type optical fiber drilling strain gauge according to claim 1 is characterized in that said measurement grating (40) has certain primary stress.
6. component type optical fiber drilling strain gauge according to claim 1 is characterized in that, further has hole (51) on the said top cover (50), and the tail optical fiber of being convenient to measure grating (40) is drawn.
7. component type optical fiber drilling strain gauge according to claim 1 is characterized in that, the two ends of said bent type beam (60) closely contact with the inwall of strain tube (20).
8. component type optical fiber drilling strain gauge according to claim 1 is characterized in that, a temperature compensation grating (45) further is installed in the said strain tube (20), is used to carry out temperature compensation.
9. component type optical fiber drilling strain gauge according to claim 8 is characterized in that, said temperature compensation grating (45) is fixed in strain tube (20) inwall through screw (22), makes temperature compensation grating (45) be in the stress free state, thereby carries out temperature compensation.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110272389 CN102359765B (en) | 2011-09-15 | 2011-09-15 | Component-type optical fiber drilling deformeter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110272389 CN102359765B (en) | 2011-09-15 | 2011-09-15 | Component-type optical fiber drilling deformeter |
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| CN102359765B CN102359765B (en) | 2013-06-05 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102661718A (en) * | 2012-05-09 | 2012-09-12 | 中国电子科技集团公司第八研究所 | Optical fiber strain sensor |
| CN103954228A (en) * | 2014-04-30 | 2014-07-30 | 中国科学院半导体研究所 | High-precision component type optical fiber drilling strain gauge |
| CN104236446A (en) * | 2014-05-08 | 2014-12-24 | 珠海市泰德企业有限公司 | Drilling multi-component strain measurement head |
| CN107328370A (en) * | 2017-06-23 | 2017-11-07 | 中国科学院武汉岩土力学研究所 | The fiber grating aperture deformation-sensor of long-term measurement surrouding rock stress |
| CN107462365A (en) * | 2017-06-23 | 2017-12-12 | 山东星盾安防科技有限公司 | A kind of scaling method of fiber grating measuring part |
| CN108871222A (en) * | 2018-08-06 | 2018-11-23 | 中国科学院武汉岩土力学研究所 | A kind of wide range fiber grating aperture deformation gauge and its check method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999000652A1 (en) * | 1997-06-27 | 1999-01-07 | Cidra Corporation | Bourdon tube pressure gauge with integral optical strain sensors for measuring tension or compressive strain |
| CA2357242A1 (en) * | 2001-02-22 | 2002-08-22 | Teraxion Inc. | Adjustable athermal package for optical fiber devices |
| CN2676143Y (en) * | 2003-11-10 | 2005-02-02 | 池顺良 | Multi component isoplanar radial displacement type boring strain gauge |
| CN201104221Y (en) * | 2007-11-16 | 2008-08-20 | 曹春耕 | Optical fibre grating strain sensor |
-
2011
- 2011-09-15 CN CN 201110272389 patent/CN102359765B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999000652A1 (en) * | 1997-06-27 | 1999-01-07 | Cidra Corporation | Bourdon tube pressure gauge with integral optical strain sensors for measuring tension or compressive strain |
| CA2357242A1 (en) * | 2001-02-22 | 2002-08-22 | Teraxion Inc. | Adjustable athermal package for optical fiber devices |
| CN2676143Y (en) * | 2003-11-10 | 2005-02-02 | 池顺良 | Multi component isoplanar radial displacement type boring strain gauge |
| CN201104221Y (en) * | 2007-11-16 | 2008-08-20 | 曹春耕 | Optical fibre grating strain sensor |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102661718A (en) * | 2012-05-09 | 2012-09-12 | 中国电子科技集团公司第八研究所 | Optical fiber strain sensor |
| CN102661718B (en) * | 2012-05-09 | 2016-01-27 | 中国电子科技集团公司第八研究所 | Fibre optic strain sensor |
| CN103954228A (en) * | 2014-04-30 | 2014-07-30 | 中国科学院半导体研究所 | High-precision component type optical fiber drilling strain gauge |
| CN104236446A (en) * | 2014-05-08 | 2014-12-24 | 珠海市泰德企业有限公司 | Drilling multi-component strain measurement head |
| CN104236446B (en) * | 2014-05-08 | 2017-05-31 | 珠海市泰德企业有限公司 | Drilling multi -components strain measurement head |
| CN107328370A (en) * | 2017-06-23 | 2017-11-07 | 中国科学院武汉岩土力学研究所 | The fiber grating aperture deformation-sensor of long-term measurement surrouding rock stress |
| CN107462365A (en) * | 2017-06-23 | 2017-12-12 | 山东星盾安防科技有限公司 | A kind of scaling method of fiber grating measuring part |
| CN108871222A (en) * | 2018-08-06 | 2018-11-23 | 中国科学院武汉岩土力学研究所 | A kind of wide range fiber grating aperture deformation gauge and its check method |
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| CN102359765B (en) | 2013-06-05 |
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