CN1635336A - Optical fiber grating inclination angle sensor - Google Patents
Optical fiber grating inclination angle sensor Download PDFInfo
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- CN1635336A CN1635336A CN 200310113187 CN200310113187A CN1635336A CN 1635336 A CN1635336 A CN 1635336A CN 200310113187 CN200310113187 CN 200310113187 CN 200310113187 A CN200310113187 A CN 200310113187A CN 1635336 A CN1635336 A CN 1635336A
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Abstract
This invention relates to a fiber grating inclination angle sensor, which comprises rack, hanging swing and light fiber, wherein the swing is hanging on the said rack by free means; the said light fiber grating is connected to the said swing and the rack by means of stopping the swing; the said fiber grating is in stretching status. It makes the even distributed light fiber grating to make relative strain between two parts and measures the reflected light wavelength displacement to compute the inclination angle.
Description
Technical field
The present invention relates to the measurement mechanism of buildings, especially adopt optical means to detect the device of buildings with respect to the pedal line angle of inclination with respect to the pedal line angle of inclination.
Background technology
Their angles of inclination with respect to pedal line all will often be monitored in various grounds and underground structure such as mansion, tunnel, bridge and slope.Especially in the bigger occasion of layer of ground soil transverse movement, near the place of carrying out building operation for example.The prior art inspected object has US6 with respect to the method and apparatus at pedal line angle of inclination, 442, disclosedly among the 855B2 survey capacitance method with electrolytic solution, disclosed bubble method among the US2002/0162235A1 is arranged, also has US6,543, disclosed magnetoelectricity method among the 147B2 all is the method for indirect measuring vertical object tilt angle.
Because the various measuring methods of prior art in fact all are to utilize the force of gravity vertical with surface level, make one and measured body that the combination change (change) of the relations of dependence be arranged, measure this change (change) again, go out the angle of inclination of measured body then by this data computation of measuring.For example bubble method will be earlier be placed on this bubble detection device on the perpendicular surface level of and tested buildings, thereby the inclined degree of buildings with respect to pedal line extrapolated in the skew of observing this bubble.Because what in fact it surveyed is a surface level, its accuracy at first just is limited by the precision that this vertical plane is converted to the anchor clamps of surface level.Besides will change into accurate angle of inclination reading itself to the skew of bubble is exactly a highly difficult problem, says nothing of this Data Digital has been monitored by computing machine.
It is identical with bubble method to survey the electric capacity ratio juris with electrolytic solution, it is wherein this phenomenon of still maintenance level of electrolytic solution when utilizing the container canting, making in the container with electrolytic solution is that the electric capacity of two pairs of electrodes of capacitor dielectric is no longer equal, thereby measures this difference and calculate the angle of inclination.The shortcoming of the method at first is to survey a direction, promptly can only survey East and West direction or north-south, survey two-wayly will use two covering devices.Besides the measuring error of electric capacity is subjected to the influence of humiture, peripheral electromagnetic field, container volume etc., so the precision of net result is very poor.
The magnetoelectricity method is to utilize two objects because of inclination relative rotation to take place, thereby causes the magnetic force line cutting lead and produce marking current.Therefore the static friction angle of these two relative revolving parts is exactly first restriction factor to degree of accuracy.And this magnetoelectricity conversion efficiency is second factor of restriction precision.Saying nothing of environment (for example highfield or high-intensity magnetic field etc.) has influenced all of this magnetoelectricity device.
As seen, above-mentioned prior art all exists all disadvantages.Over past ten years, fiber grating sensing technology begins to be subjected to the people to note.The ultimate principle of this novel sensing technology is based on the modulation of measured signal to the fiber grating reflection wavelength, and measured signal changes the reflection wavelength of fiber grating, knows the size of measured signal by detection fiber optical grating reflection wavelength variations.This novel sensing technology has the following advantages: the one, and good reliability can realize absolute measurement; The 2nd, anti-electromagnetic interference (EMI), electrical isolation can be in the work down of inflammable and explosive environment; The 3rd, reusability is good, and a plurality of Fibre Optical Sensors can be serially connected on same the optical fiber at an easy rate, are convenient to form Measurement Network.
Because the above advantage of fiber grating sensing technology, researchers actively develop research work all over the world, fiber grating sensing technology have been applied to the measurement of multiple physical quantitys such as temperature, strain, pressure, displacement, acceleration, flow.But up to the present, people still fail fiber grating sensing technology is applied to the measurement of object tilt angle.How fiber grating sensing technology being applied to the inclination angle monitoring, utilizing the various advantages of fiber grating sensing technology, overcome above-mentioned inclination angle monitoring the deficiencies in the prior art, still is a great problem at present.
Summary of the invention
The purpose of this invention is to provide a kind of device of using optical fiber grating measuring buildings with respect to the pedal line angle of inclination, it had both avoided all deficiencies of above-mentioned prior art indirect method, had the above-mentioned various advantages that can enjoy with the optical fiber grating measuring technology again.
In order to achieve the above object, the invention provides a kind of fiber grating obliquity sensor, comprise support, pendulum and optical fiber; Described pendulum hangs on the described support in the mode that can freely swing; Have fiber grating on the described optical fiber; Described fiber grating connects described pendulum and described support in the mode that can stop described pendulum swing, and the one side connects described pendulum, and its opposite side connects described support, and described fiber grating is in extended state.
Aforesaid fiber grating obliquity sensor, wherein, described pendulum hangs on the described support in the mode that can only freely swing in certain specific perpendicular; Have two fiber gratings on the described optical fiber; Described these two fiber gratings stop the motion of described pendulum to two opposite directions respectively.
Aforesaid fiber grating obliquity sensor, wherein, described pendulum hangs on the described support in the mode that can freely swing in any perpendicular; Have four fiber gratings on the described optical fiber; Wherein the axis of two fiber gratings is in the perpendicular of a described pendulum hitch point of process, and these two fiber gratings stop the motion to two opposite directions in this plane of described pendulum respectively; The axis of two other fiber grating is in perpendicular to above-mentioned perpendicular and process another perpendicular of described pendulum hitch point, and these two fiber gratings stop the motion to two opposite directions in this plane of described pendulum respectively.
Aforesaid fiber grating obliquity sensor, wherein, described fiber grating connects described pendulum by web member.
Aforesaid fiber grating obliquity sensor, wherein, described pendulum comprises fork and pendulum, for being made into integration or assembling.
Aforesaid fiber grating obliquity sensor, wherein, described support and pendulum are that stainless steel material is made.
Principle of work of the present invention is: when the support run-off the straight, because the effect of gravity, described pendulum has the trend that moves, and causes fiber grating further to be stretched, and stops pendulum to move from the pulling force of optical fiber.Because fiber grating is stretched, its reflection wavelength is moved, and the angle of inclination is big more, and optical fiber is stretched severely more, the amount of movement of fiber grating reflection wavelength is also just big more, can calculate the size at angle of inclination by the reflection wavelength amount of movement of monitoring fiber grating.
The invention has the beneficial effects as follows, fiber grating inclination sensor device of the present invention is simple, with low cost, easy to operate, be not subjected to electromagnetic field effects, not temperature influence, must not calibrated scale, can bidirectional measurement, the use of can contacting, can adjust precision, therefore can improve the precision that art methods can reach significantly.
Description of drawings
Fig. 1 is the synoptic diagram of first embodiment of the invention;
Fig. 2 is the synoptic diagram of second embodiment of the invention;
Fig. 3 is the synoptic diagram of third embodiment of the invention;
Fig. 4 is the synoptic diagram of fourth embodiment of the invention;
Fig. 5 is the synoptic diagram of fifth embodiment of the invention;
Fig. 6 is the synoptic diagram of sixth embodiment of the invention;
Fig. 7 is the synoptic diagram of seventh embodiment of the invention.
Embodiment
Fig. 1 shows the first embodiment of the present invention.Fiber grating obliquity sensor of the present invention is made of support 1, pendulum 2 and optical fiber 3.Pendulum 2 hangs on the support 1 in the mode that can freely swing in any perpendicular, has fiber grating 4 on the optical fiber 3, and a side of fiber grating 4 connects pendulum 2 in mode gluing or welding, and opposite side connects support 1 in mode gluing or welding.Fiber grating 4 is in extended state, and the center of gravity of the axis of fiber grating 4, pendulum 2 and the line of its hitch point and gravity vertical three are on same straight line.When this fiber grating obliquity sensor run-off the straight, because the effect of gravity, pendulum 2 has the trend that moves, and causes fiber grating further to be stretched, and stops pendulum 2 to move from the pulling force of optical fiber.Because fiber grating is stretched, its reflection wavelength moves to the long wave direction, and the angle of inclination is big more, and fiber grating is stretched severely more, the amount of movement of its reflection wavelength is also just big more, can calculate the size at angle of inclination by the reflection wavelength amount of movement of monitoring fiber grating.
Here be noted that, exemplarily be painted as a rectangular framework at Fig. 1 medium-height trestle 1, though exemplarily being painted as a fork and one, pendulum 2 represent the pendulum of weight to hang down, but when using, reality there is no this restriction, any suitable shape is all spendable, for example support can be a three-dimensional framework, can also have crossbeam or transverse arm etc. on it.As a same reason, the material that is used to make framework 1 and fork is except requiring to have big rigidity (for example stainless steel), and is also unrestricted.
Fig. 2 shows the second embodiment of the present invention.Different with first embodiment is, pendulum 2 in embodiment illustrated in fig. 2 is with can only be at a specific perpendicular (for convenience's sake, we represent with the y-z plane) in the mode that freely swings hang on the support 1, two fiber gratings are arranged on the optical fiber 3, be fiber grating 4 and fiber grating 5, each connects pendulum 2 with the one side these two fiber gratings, connects support 1 with its opposite side.The axis of two fiber gratings is all perpendicular to the terrestrial attraction active line, all in the y-z plane, and on same straight line.Two fiber gratings have different reflection wavelengths, all are in extended state.These two fiber gratings stop pendulum 2 motion to two opposite directions in the y-z plane respectively.When the fiber grating obliquity sensor in the y-z plane during run-off the straight, pendulum 2 has the trend that moves, consequently, a fiber grating is stretched, and its reflection wavelength moves to the long wave direction, and another fiber grating is compressed, its reflection wavelength moves to the shortwave direction, the difference of the reflection wavelength of two fiber gratings changes, and the situation of change of the difference of the reflection wavelength by monitoring these two fiber gratings can calculate the size at angle of inclination in the y-z plane.
The advantage of this embodiment is, it can overcome the temperature cross-interference issue, and its measurement result is temperature influence not.Because the reflection wavelength of fiber grating also depends on temperature, if determine information measured by the reflection wavelength situation of change of monitoring single fiber grating, measurement result is subjected to temperature effect inevitably, and variation of ambient temperature can cause measuring error.In the present embodiment, information measured is to determine by the difference of the reflection wavelength of monitoring two fiber gratings, produces identical wavelength variable quantity because temperature variation causes two fiber gratings, and the difference of its wavelength only depends on the angle of inclination, is temperature independent.Therefore, the measurement result of present embodiment temperature influence not.
Fig. 3 and Fig. 4 show third and fourth embodiment of the present invention.In these two embodiment, pendulum 2 also is with can only be at a specific perpendicular (for convenience's sake, we represent with the y-z plane equally) in the mode that freely swings hang on the support 1, two fiber gratings are also arranged on the optical fiber 3, be fiber grating 4 and fiber grating 5, two fiber gratings have different reflection wavelengths, all are in extended state.Two fiber gratings respectively connect pendulums 2 with the one side by web member 6, connect support 1 with its opposite side.Web member 6 is made for rigid material, is rigidly connected with pendulum 2.In the 3rd embodiment, the axis of two fiber gratings all in the y-z plane, is parallel to the terrestrial attraction active line, and lays respectively at the both sides of terrestrial attraction active line.In the 4th embodiment, the axis conllinear of two fiber gratings is parallel to line of gravity, and in the y-z plane.The principle of work of these two embodiment is identical with second embodiment, can measure the size at angle of inclination in the y-z plane, and its measurement result is temperature influence not also.
Fig. 5, Fig. 6 and Fig. 7 show the 5th, the 6th and the 7th embodiment of the present invention.Among several in front embodiment, first embodiment can provide the size at inclination angle, but can not provide the direction of inclination, second, third and fourth embodiment can overcome the temperature cross-interference issue, but can only survey a direction, promptly can only provide the angle of inclination size of measured object at (on east-west direction) on the specific direction, below introduce the 5th, the the 6th and the 7th embodiment can survey both direction simultaneously, promptly can provide measured object angle of inclination size of (as east-west direction and North and South direction) on two orthogonal directionss simultaneously, simultaneously, these three embodiment also can overcome the temperature cross-interference issue.In these three embodiment, pendulum 2 hangs on the support 1 in the mode that can freely swing in any perpendicular, have four fiber gratings on the optical fiber 3, be fiber grating 4, fiber grating 5, fiber grating 7 and fiber grating 8, each connects support 1 with the one side these four fiber gratings, connects pendulum 2 with its opposite side by web member 6.Web member 6 is made for rigid material, is rigidly connected with pendulum 2.The axis of fiber grating 4 and fiber grating 5 is in the perpendicular of a described pendulum hitch point of process, and the axis of fiber grating 7 and fiber grating 8 is perpendicular to the perpendicular at the axis place of fiber grating 4 and fiber grating 5 and through in another perpendicular of described pendulum hitch point.In order to express conveniently, the hitch point that we define with pendulum 2 is the x-y-z three-dimensional cartesian coordinate system of initial point, and the axis of fiber grating 4 and fiber grating 5 is in the y-z plane, and the axis of fiber grating 7 and fiber grating 8 is in the x-z plane.When the fiber grating obliquity sensor in the y-z plane during run-off the straight, pendulum 2 has the trend that moves in this plane, one in fiber grating 4 and the fiber grating 5 is compressed, another is stretched, the fiber grating that is stretched stops pendulum to move, and fiber grating 7 and fiber grating 8 both be subjected to the small stretching of same degree, consequently, the reflection wavelength of fiber grating 4 and fiber grating 5 moves in the opposite direction, promptly one is moved to the long wave direction, another moves to the shortwave direction, the difference of its wavelength changes with the angle of inclination, and identical minute movement amount takes place to the long wave direction in the reflection wavelength of fiber grating 7 and fiber grating 8, and it is constant that the difference of its wavelength keeps.As a same reason, when the fiber grating obliquity sensor in the x-z plane during run-off the straight, the difference of the reflection wavelength of fiber grating 7 and fiber grating 8 changes with the angle of inclination, and that the difference of the reflection wavelength of fiber grating 4 and fiber grating 5 keeps is constant.That is to say that the difference of the reflection wavelength of fiber grating 4 and fiber grating 5 only depends on the angle of inclination in the y-z plane, and the difference of the reflection wavelength of fiber grating 7 and fiber grating 8 only depends on the angle of inclination in the x-z plane.Therefore, the difference of the reflection wavelength by monitoring fiber grating 4 and fiber grating 5 can calculate the angle of inclination size in the y-z plane, the difference of the reflection wavelength by monitoring fiber grating 7 and fiber grating 8 can calculate the angle of inclination size in the x-z plane, so just can utilize a fiber grating obliquity sensor to measure both direction simultaneously, this is the outstanding advantage of these three embodiment.
Carry out theoretical deduction below in conjunction with the 7th embodiment, provide the difference of fiber grating reflection wavelength and the relational expression between the angle of inclination.
When at the inclination angle being zero, four fiber gratings are in identical extended state, suppose that its strain this moment is that the reflection wavelength of 0, four fiber grating of ε is expressed as λ i (i=1,2,3,4) respectively.When this sensor from the upright position during with an angular deflection, the strain of each fiber grating changes.Remain 0 degree if suppose this inclination in the x-z plane, the inclination in the y-z plane is θ, and then the equilibrium equation of pendulum 2 is:
AE (ε 0+ Δ ε 3) α-AE (ε 0+ Δ ε 1) α=0 and (1)
AE(ε0+Δε4)α-AE(ε0+Δε2)α-mglsinθ＝0 (2)
Wherein A is the area of section of this optical fiber 3, and E is the elastic modulus of optical fiber 3 host materials, and m is the pendulum quality, and g is an acceleration of gravity, and l is the length of pendulum 2, and α is the vertical range of hitch point to the fiber grating axis.Equation (1) and (2) can be simplified as:
Δ ε 3-Δ ε 1=0 and (3)
Δε4-Δε2＝(mgl/Aeα)sinθ (4)
For the single mode silica fibre, the fiber grating reflection wavelength that strain causes is changed to:
Δλ/λ＝(1-Pe)Δε， (5)
Wherein Pe is the photoelasticity coefficient of this optical fiber.
Equation (5) substitution equation (3) and (4) are obtained:
(Δ λ 3/ λ 3)-(Δ λ 1/ λ 1)=0 and (6)
(Δλ4/λ4)-(Δλ2/λ2)＝(mgl/AEα)(1-Pe)sinθ (7)
If supposition Δ λ 1≤λ 1, λ 1 λ 3, and λ 2 λ 4, then equation (6) and equation (7) can be simplified as:
Δ (λ 3-λ 1)=0 and (8)
Δ(λ4-λ2)＝(mgl/AEα)(1-Pe)λ2sinθ (9)
Similarly, the variation of the wavelength difference between λ 3 and the λ 1 for the angle of inclination in the x-z plane, is supposed θ=0 °, then:
Δ (λ 4-λ 2)=0 and (10)
Δ(λ3-λ1)＝(mgl/AEα)(1-Pe)λ1sin (11)
Equation (9) and (11) show that wavelength difference Δ (λ 4-λ 2) and Δ (λ 3-λ 1) are separately along with sin θ and sin change linearly.For little degree of tilt (that is, below 20 °), linear between angle of inclination and the wavelength difference.
By equation (9) and (11) as can be known, the sensitivity of the 7th embodiment and pendulum quality m, pendulum length l, hitch point are relevant to the distance alpha of fiber grating axis.During specific design, can choose these three parameters as required, to reach the suitable sensitivity index.
Claims (6)
1, a kind of fiber grating obliquity sensor is characterized in that, comprises support, pendulum and optical fiber; Described pendulum hangs on the described support in the mode that can freely swing; Have fiber grating on the described optical fiber; Described fiber grating connects described pendulum and described support in the mode that can stop described pendulum swing, and the one side connects described pendulum, and its opposite side connects described support, and described fiber grating is in extended state.
2, fiber grating obliquity sensor as claimed in claim 1 is characterized in that, described pendulum hangs on the described support in the mode that can only freely swing in certain specific perpendicular; Have two fiber gratings on the described optical fiber; Described these two fiber gratings stop the motion of described pendulum to two opposite directions respectively.
3, fiber grating obliquity sensor as claimed in claim 1 is characterized in that, described pendulum hangs on the described support in the mode that can freely swing in any perpendicular; Have four fiber gratings on the described optical fiber; Wherein the axis of two fiber gratings is in the perpendicular of a described pendulum hitch point of process, and these two fiber gratings stop the motion to two opposite directions in this plane of described pendulum respectively; The axis of two other fiber grating is in perpendicular to above-mentioned perpendicular and process another perpendicular of described pendulum hitch point, and these two fiber gratings stop the motion to two opposite directions in this plane of described pendulum respectively.
4, fiber grating obliquity sensor as claimed in claim 1 is characterized in that, described fiber grating connects described pendulum by web member.
5, fiber grating obliquity sensor as claimed in claim 1 is characterized in that, described pendulum comprises fork and pendulum, for being made into integration or assembling.
6, fiber grating obliquity sensor as claimed in claim 1 is characterized in that, described support and pendulum are that stainless steel material is made.
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Cited By (25)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101852597A (en) * | 2010-06-08 | 2010-10-06 | 中国计量学院 | Temperature-insensitive fiber grating tilt sensor |
| CN102168970A (en) * | 2010-12-29 | 2011-08-31 | 中国计量学院 | One-dimensional inclination angle sensor based on PCF-LPG (Long-Period Grating written in Photonic Crystal Fiber) and device |
| CN102175185A (en) * | 2011-01-20 | 2011-09-07 | 中南大学 | Fiber bragg grating tilt sensor and calibrating method thereof |
| CN102495235A (en) * | 2011-11-14 | 2012-06-13 | 武汉理工大学 | Fiber bragg grating sensor for 3D acceleration measurement |
| CN104807536A (en) * | 2015-01-05 | 2015-07-29 | 武汉理工大学 | Fiber Bragg grating two-dimensional vibration sensor with temperature compensation |
| CN105180900A (en) * | 2015-08-28 | 2015-12-23 | 中国科学院半导体研究所 | Fiber clinometer |
| CN106289166A (en) * | 2016-07-18 | 2017-01-04 | 武汉理工大学 | A kind of optical fiber obliquity sensor and wavelength-division multiplex method thereof |
| CN106595590A (en) * | 2016-12-13 | 2017-04-26 | 武汉理工大学 | Dual-axis inclinometer based on balance bar principle |
| CN106912222A (en) * | 2017-04-21 | 2017-07-04 | 山东农业大学 | A kind of automatic adjusting device for ditching depth for garden ditching machine |
| CN107966181A (en) * | 2017-12-30 | 2018-04-27 | 石家庄铁道大学 | Wind speed wind direction sensor |
| CN108801168A (en) * | 2018-06-12 | 2018-11-13 | 申家海 | A kind of slope deforming monitoring and prior-warning device automatically |
| CN108917656A (en) * | 2018-07-24 | 2018-11-30 | 蚌埠学院 | A kind of Multi-Axis Fiber Bragg Gratings inclination sensor |
| KR101956793B1 (en) * | 2018-08-09 | 2019-03-13 | 라온구조안전기술(주) | Inclinometer using Optical Fiber Sensors, and Method for Measuring Inclining Angle using such Inclinometer |
| CN109470211A (en) * | 2018-10-18 | 2019-03-15 | 中际物联科技（深圳）有限公司 | A kind of novel optical fiber inclination sensor of stretching structure |
| KR101979292B1 (en) * | 2018-12-10 | 2019-05-16 | 라온구조안전기술(주) | Inclinometer for Underground using Optical Fiber Sensors, and Method for Measuring Inclining Angle of Underground using such Inclinometer |
| CN109883486A (en) * | 2019-03-29 | 2019-06-14 | 蚌埠学院 | A kind of dual-purpose fiber-optic grating sensor of tilt acceleration |
| CN109945806A (en) * | 2019-04-15 | 2019-06-28 | 沈阳建筑大学 | A kind of two-dimensional fiber bragg grating obliquity sensor |
| CN112344881A (en) * | 2020-10-28 | 2021-02-09 | 胡仲春 | Fiber grating tilt angle sensor made of all-glass |
| CN112502515A (en) * | 2020-10-09 | 2021-03-16 | 贵州黔冠鼎盛实业有限公司 | Intelligent electric pole with automatic gradient monitoring function |
| CN112902921A (en) * | 2021-01-26 | 2021-06-04 | 哈尔滨工程大学 | Force balance push-pull type optical fiber two-dimensional inclination measuring device |
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| CN115164843A (en) * | 2022-09-08 | 2022-10-11 | 深圳市城市交通规划设计研究中心股份有限公司 | Bridge inclination angle measuring device, bridge deflection measuring method and device |
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| CN108917656B (en) * | 2018-07-24 | 2024-05-17 | 蚌埠学院 | Double-shaft fiber bragg grating inclination sensor |
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2003
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Cited By (32)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101852597A (en) * | 2010-06-08 | 2010-10-06 | 中国计量学院 | Temperature-insensitive fiber grating tilt sensor |
| CN102168970A (en) * | 2010-12-29 | 2011-08-31 | 中国计量学院 | One-dimensional inclination angle sensor based on PCF-LPG (Long-Period Grating written in Photonic Crystal Fiber) and device |
| CN102168970B (en) * | 2010-12-29 | 2012-12-12 | 中国计量学院 | One-dimensional inclination angle sensor based on PCF-LPG (Long-Period Grating written in Photonic Crystal Fiber) and device |
| CN102175185A (en) * | 2011-01-20 | 2011-09-07 | 中南大学 | Fiber bragg grating tilt sensor and calibrating method thereof |
| CN102495235A (en) * | 2011-11-14 | 2012-06-13 | 武汉理工大学 | Fiber bragg grating sensor for 3D acceleration measurement |
| CN104807536B (en) * | 2015-01-05 | 2018-03-16 | 武汉理工大学 | Fiber grating two-dimensional vibrating sensor with temperature-compensating |
| CN104807536A (en) * | 2015-01-05 | 2015-07-29 | 武汉理工大学 | Fiber Bragg grating two-dimensional vibration sensor with temperature compensation |
| CN105180900A (en) * | 2015-08-28 | 2015-12-23 | 中国科学院半导体研究所 | Fiber clinometer |
| CN106289166A (en) * | 2016-07-18 | 2017-01-04 | 武汉理工大学 | A kind of optical fiber obliquity sensor and wavelength-division multiplex method thereof |
| CN106595590B (en) * | 2016-12-13 | 2019-04-30 | 武汉理工大学 | A kind of dual-axis inclinometer based on balance rod principle |
| CN106595590A (en) * | 2016-12-13 | 2017-04-26 | 武汉理工大学 | Dual-axis inclinometer based on balance bar principle |
| CN106912222A (en) * | 2017-04-21 | 2017-07-04 | 山东农业大学 | A kind of automatic adjusting device for ditching depth for garden ditching machine |
| CN107966181A (en) * | 2017-12-30 | 2018-04-27 | 石家庄铁道大学 | Wind speed wind direction sensor |
| CN107966181B (en) * | 2017-12-30 | 2024-04-12 | 石家庄铁道大学 | Wind speed and direction sensor |
| CN108801168A (en) * | 2018-06-12 | 2018-11-13 | 申家海 | A kind of slope deforming monitoring and prior-warning device automatically |
| CN108917656A (en) * | 2018-07-24 | 2018-11-30 | 蚌埠学院 | A kind of Multi-Axis Fiber Bragg Gratings inclination sensor |
| CN108917656B (en) * | 2018-07-24 | 2024-05-17 | 蚌埠学院 | Double-shaft fiber bragg grating inclination sensor |
| KR101956793B1 (en) * | 2018-08-09 | 2019-03-13 | 라온구조안전기술(주) | Inclinometer using Optical Fiber Sensors, and Method for Measuring Inclining Angle using such Inclinometer |
| CN109470211A (en) * | 2018-10-18 | 2019-03-15 | 中际物联科技（深圳）有限公司 | A kind of novel optical fiber inclination sensor of stretching structure |
| KR101979292B1 (en) * | 2018-12-10 | 2019-05-16 | 라온구조안전기술(주) | Inclinometer for Underground using Optical Fiber Sensors, and Method for Measuring Inclining Angle of Underground using such Inclinometer |
| CN109883486A (en) * | 2019-03-29 | 2019-06-14 | 蚌埠学院 | A kind of dual-purpose fiber-optic grating sensor of tilt acceleration |
| CN109945806A (en) * | 2019-04-15 | 2019-06-28 | 沈阳建筑大学 | A kind of two-dimensional fiber bragg grating obliquity sensor |
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