CN210464535U - Fiber grating sensor for simultaneously measuring two-dimensional inclination and vibration - Google Patents
Fiber grating sensor for simultaneously measuring two-dimensional inclination and vibration Download PDFInfo
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- CN210464535U CN210464535U CN201920916580.7U CN201920916580U CN210464535U CN 210464535 U CN210464535 U CN 210464535U CN 201920916580 U CN201920916580 U CN 201920916580U CN 210464535 U CN210464535 U CN 210464535U
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Abstract
The utility model discloses a two-dimensional slope and vibration simultaneous measurement's fiber grating sensor, this sensor includes: the device comprises a thin-wall square barrel, a thin-wall square barrel fixing seat, a ball, a shell, a roller elastic support, a roller and a plurality of fiber gratings; the shell is a hollow cylinder with an open bottom end; the thin-wall square cylinder is fixedly connected with the thin-wall square cylinder fixing seat, and the thin-wall square cylinder fixing seat are fixed in the shell together; the ball is a hollow ball with a certain wall thickness and is positioned in the thin-wall square cylinder; one end of the roller elastic bracket is fixed on the shell, and the other end of the roller elastic bracket is fixedly connected with the roller bracket; the roller bracket is used for mounting a roller; and the fiber gratings are respectively adhered to the outer wall surface of the thin-wall square cylinder for measurement. The utility model discloses can realize the simultaneous measurement of slope and sudden vibration, can solve the incomplete problem of side slope safety information monitoring, also solved simultaneously because of the crooked sensor that causes of monitoring later stage deviational survey pipe is difficult for taking out, can not reuse the problem.
Description
Technical Field
The utility model belongs to the technical field of the optical fiber sensing, concretely relates to two-dimensional slope and vibration simultaneous measurement's fiber grating sensor is applicable to the environment of slope and vibration simultaneous monitoring.
Background
In order to meet the requirements of engineering construction, mountains are frequently excavated to form a large number of side slopes. The side slope is easy to generate landslide when being influenced by stormy weather, snow melting, tsunami and nearby construction vibration. According to incomplete statistics, serious landslide accidents occur in China every year, so that a large number of casualties and property losses are caused, and therefore effective slope safety monitoring is very necessary.
In side slope safety monitoring, the use of inclinometer is the most common and extensive, and traditional electricity inclinometer needs the staff to put into the inclinometer that buries in advance with the electricity inclinometer in, still needs the staff to go the scene when acquireing monitored data and promotes the inclinometer according to the interval of uniform height with the electricity inclinometer, promotes once data once, reachs the deformation condition of side slope through the data processing in later stage. The traditional electric inclinometer outputs weak current signals, is very easy to be influenced by surrounding electromagnetic fields to cause inaccuracy of monitoring data, needs manual field operation when acquiring the monitoring data, brings hidden danger to personal safety of workers and cannot realize real-time monitoring. Not only is a large amount of manpower and material resources consumed, but also the obtained monitoring data is not very accurate.
The chinese utility model patent with publication number "CN 105953751A" discloses a distributed deformation monitoring device, method and fiber grating tilt angle sensor, structure, this sensor pastes fiber grating on a pair of equal strength roof beams respectively, at the fixed heavy thing piece of lower extreme of equal strength roof beam, when the sensor takes place the slope, heavy thing piece can drive the cantilever beam and take place deformation to paste the fiber grating on the cantilever beam and will produce corresponding deformation, central wavelength will change, release the slope variation according to the change of central wavelength. In addition, the two sides of the sensor are also provided with guide bulges so that the sensor can freely slide in the inclinometer pipe, but in the later stage of monitoring, the inclinometer pipe can be bent due to the deformation and the inclination of a side slope, and the guide bulges of the sensor can be clamped in the inclinometer pipe so that the used sensor cannot be smoothly proposed. In addition, in the process of monitoring the side slope, the side slope can also integrally move, the sensor can only monitor the deformation and inclination in the side slope, and the integral side slope movement cannot be monitored, so that timely and accurate alarm cannot be realized.
SUMMERY OF THE UTILITY MODEL
To the above-mentioned problem that exists among the prior art, the utility model provides a two-dimensional slope and vibration simultaneous measurement's fiber grating sensor can realize slope and sudden vibration's simultaneous measurement, can solve the incomplete problem of side slope safety information monitoring, has also solved the sensor that causes because of monitoring later stage deviational survey pipe is crooked simultaneously and is difficult for taking out, can not reuse the problem.
Therefore, the utility model adopts the following technical scheme:
a fiber grating sensor for simultaneous measurement of tilt and vibration in two dimensions, comprising: the device comprises a thin-wall square barrel, a thin-wall square barrel fixing seat, a ball, a shell, a roller elastic support, a roller and a plurality of fiber gratings; the shell is a hollow cylinder with an open bottom end; the thin-wall square cylinder is fixedly connected with the thin-wall square cylinder fixing seat, and the thin-wall square cylinder fixing seat are fixed in the shell together; the round ball is a hollow round ball with a certain wall thickness and is positioned in the thin-wall square cylinder; the roller elastic support is an elastic sheet folded at a certain angle, one end of the roller elastic support is fixed on the shell, and the other end of the roller elastic support is fixedly connected with the roller support; the roller bracket is used for mounting a roller; the fiber gratings are respectively adhered to the outer wall surface of the thin-wall square cylinder for measurement.
Preferably, the number of the roller elastic supports, the number of the roller supports and the number of the rollers are four, one roller elastic support, one roller support and one roller form a group, and the four groups are respectively positioned on two sides of the upper end and the lower end of the shell.
Preferably, the upper end of the thin-wall square cylinder is provided with a through hole, and the thin-wall square cylinder is fixed with the thin-wall square cylinder fixing seat through the through hole; the upper ends of 4 side surfaces of the thin-wall square cylinder are also provided with grooves for leading out optical fibers.
Preferably, a first threaded hole is formed in the position of a boss at the lower end of the thin-wall square cylinder fixing seat and used for connecting and fixing the thin-wall square cylinder fixing seat and the thin-wall square cylinder; the upper end face of the thin-wall square cylinder fixing seat is provided with 4 second threaded holes for connecting and fixing the thin-wall square cylinder fixing seat and the shell; a first optical fiber leading-out hole is formed in the center of the upper end face of the thin-wall square cylinder fixing seat and used for leading out optical fibers.
Preferably, the number of the fiber gratings is four, and the fiber gratings are a first fiber grating, a second fiber grating, a third fiber grating and a fourth fiber grating; the round ball is tangent to four inner walls of the thin-wall square cylinder, and the round ball and the thin-wall square cylinder are fixed at 4 tangent points by adopting an adhesive; the first fiber bragg grating, the second fiber bragg grating, the third fiber bragg grating and the fourth fiber bragg grating are respectively stuck to the outer wall of the thin-wall square cylinder corresponding to the tangent position of the round ball and the thin-wall square cylinder.
Preferably, the inside of the shell is a hollow cylinder with an open bottom end, the outside of the shell is in a hexagonal shape, and a second optical fiber leading-out hole is formed in the central position of the upper end of the shell; the upper end of the shell is provided with 4 second counter bores for fixing the thin-wall square cylinder fixing seat; third threaded holes are formed in two end faces of the shell, and fourth threaded holes are formed in the upper side and the lower side of the shell; one end of the roller elastic support is fixed with a fourth threaded hole in the shell through a screw.
Preferably, one end of the roller bracket is provided with a rectangular groove for placing and fixing the roller elastic bracket; the other end of the roller wheel bracket is provided with a groove, and the end surfaces of the two sides of the groove are provided with through holes; the roller is arranged in the groove of the roller bracket through the roller pin, and the roller pin is in interference fit with the through holes at the two ends of the groove of the roller bracket and is used for preventing the roller pin from sliding and falling off; the central hole of the roller is in clearance fit with the roller pin, so that the roller can rotate freely.
Preferably, the sensor further comprises an upper hanging plate and a lower hanging plate, the upper hanging plate and the lower hanging plate have the same structure and are respectively fixed on the upper end surface and the lower end surface of the shell through screws; the bottom of the upper hanging plate is provided with 6 first counter bores for connecting and fixing the hanging plate and the shell; a steel wire rope hole is formed in the center of the upper end of the upper hanging plate, and 3 steel wire rope thread fixing holes are formed in the side face of the steel wire rope hole and used for locking a steel wire rope; a third optical fiber leading-out hole is arranged beside the steel wire rope hole; the center of the bottom of the hanging plate is provided with a large-diameter round hole, so that the optical fiber can be conveniently led out.
Preferably, the assembled sensors are connected in series through steel wire ropes fixed on the upper hanging plate and the lower hanging plate, the sensors are connected in series to realize distributed monitoring, and the distance between the sensors connected in series is adjusted through the length of the steel wire ropes.
Compared with the prior art, the beneficial effects of the utility model are that:
(1) 4 gyro wheel elastic support are installed to the casing of sensor, install the gyro wheel on gyro wheel elastic support, can put into the sensor fast and propose the deviational survey pipe, because of gyro wheel elastic support has certain elasticity, even also can be easily when the monitoring later stage deviational survey pipe on slope has taken place certain bending with the sensor, realize reuse once more, practice thrift the cost.
(2) The fiber bragg gratings are respectively pasted in 4 directions of the thin-wall square cylinder, namely the front direction, the rear direction, the left direction and the right direction, the difference value of the wavelength drift amounts of the pair of fiber bragg gratings in the left and right directions is used as an output signal in the X direction, the difference value of the wavelength drift amounts of the pair of fiber bragg gratings in the front and rear directions is used as an output signal in the Y direction, the influence of the environment temperature on a monitoring result is eliminated, and the two-dimensional inclination measurement is realized.
(3) For the high-risk side slope, a plurality of sensors can be connected in series through the upper and lower hanging plates of the sensors by using the steel wire ropes, and distributed measurement is realized.
(4) The sensor can simultaneously acquire the information of the deformation inclination and the sudden vibration, and then process the wavelength drift caused by the inclination and the vibration respectively according to different characteristics of the wavelength change caused by the deformation inclination and the sudden vibration, thereby realizing the simultaneous measurement of the two-dimensional inclination and the vibration.
(5) Simple structure, convenient to use can monitor holistic slope and remove, realizes timely, accurate warning.
Drawings
Fig. 1 is a schematic sectional structure diagram of a fiber grating sensor for simultaneously measuring two-dimensional tilt and vibration provided by the present invention.
Fig. 2 is a schematic diagram of the fiber grating distribution of the fiber grating sensor for simultaneously measuring two-dimensional inclination and vibration provided by the present invention.
Fig. 3 is a schematic structural diagram of a thin-wall square tube fixing seat of a fiber grating sensor for simultaneously measuring two-dimensional inclination and vibration provided by the utility model.
Fig. 4 is a schematic structural diagram of an upper hanger plate of a fiber grating sensor for simultaneously measuring two-dimensional inclination and vibration provided by the present invention.
Fig. 5 is a schematic structural diagram of a housing of a fiber grating sensor for simultaneously measuring two-dimensional tilt and vibration according to the present invention.
Fig. 6 is a schematic diagram of series distributed measurement of a fiber grating sensor for simultaneously measuring two-dimensional tilt and vibration provided by the present invention.
Fig. 7 is a schematic diagram of the fiber grating sensor for simultaneously measuring two-dimensional tilt and vibration according to the present invention.
Description of reference numerals: 1. a thin-walled square cylinder; 2. a thin-wall square cylinder fixing seat; 3. an upper hanger plate; 4. a ball; 5. a housing; 6. a roller elastic support; 7. a roller bracket; 8. a roller; 9. a lower hanger plate; 10. a first fiber grating; 11. a second fiber grating; 12. a third fiber grating; 13. a fourth fiber grating; 2-1, a first threaded hole; 2-2, a second threaded hole; 2-3, a first fiber leading-out hole; 3-1, a third fiber leading-out hole; 3-2, steel wire rope holes; 3-3, fixing holes for steel wire rope threads; 3-4, large diameter round hole; 3-5, a first counter sink; 5-1, a second fiber leading-out hole; 5-2, second counter sink; 5-3, a third threaded hole; 5-4 and a fourth threaded hole.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and specific embodiments, which are only used for explaining the present invention, but not for limiting the present invention.
As shown in fig. 1, the utility model discloses a two-dimensional slope and vibration simultaneous measurement's fiber grating sensor, include: the device comprises a thin-wall square barrel 1, a thin-wall square barrel fixing seat 2, a ball 4, a shell 5, a roller elastic support 6, a roller support 7, a roller 8 and a plurality of fiber gratings; the shell 5 is a hollow cylinder with an open bottom end; the thin-wall square cylinder 1 is fixedly connected with the thin-wall square cylinder fixing seat 2, and the thin-wall square cylinder 1 and the thin-wall square cylinder fixing seat are fixed in the shell 5 together; the round ball 4 is a hollow round ball with a certain wall thickness and is positioned in the thin-wall square cylinder 1; the roller elastic support 6 is an elastic sheet folded at a certain angle, one end of the roller elastic support is fixed on the shell 5, and the other end of the roller elastic support is fixedly connected with the roller support 7; the roller bracket 7 is used for mounting a roller 8; the fiber gratings are respectively adhered to the outer wall surface of the thin-wall square cylinder 1 for measurement.
Specifically, the number of the roller elastic supports 6, the number of the roller supports 7 and the number of the rollers 8 are four, one roller elastic support 6, one roller support 7 and one roller 8 form one group, and the four groups are respectively located on two sides of the upper end and the lower end of the shell 5.
Specifically, the upper end of the thin-wall square cylinder 1 is provided with a through hole, and the thin-wall square cylinder is fixed on the thin-wall square cylinder fixing seat 2 through the through hole; the upper ends of 4 side surfaces of the thin-wall square cylinder 1 are also provided with grooves for leading out optical fibers.
Specifically, as shown in fig. 3, a first threaded hole 2-1 is formed in a boss at the lower end of the thin-wall square cylinder fixing seat 2, and is used for connecting and fixing the thin-wall square cylinder fixing seat 2 and the thin-wall square cylinder 1; the upper end surface of the thin-wall square cylinder fixing seat 2 is provided with 4 second threaded holes 2-2 for connecting and fixing the thin-wall square cylinder fixing seat 2 and the shell 5; a first optical fiber leading-out hole 2-3 is arranged at the central position of the upper end surface of the thin-wall square cylinder fixing seat 2 and used for leading out an optical fiber.
Specifically, as shown in fig. 2, the number of the fiber gratings is four, which are respectively a first fiber grating 10, a second fiber grating 11, a third fiber grating 12 and a fourth fiber grating 13; the round ball 4 is tangent to the four inner walls of the thin-wall square cylinder 1, and the round ball 4 and the thin-wall square cylinder 1 are fixed at the 4 tangent points by adopting an adhesive; the first fiber grating 10, the second fiber grating 11, the third fiber grating 12 and the fourth fiber grating 13 are respectively adhered to the outer wall of the thin-wall square cylinder 1 corresponding to the tangent position of the round ball 4 and the thin-wall square cylinder 1.
Specifically, as shown in fig. 5, the inside of the housing 5 is a hollow cylinder with an open bottom end, the outside is a hexagonal shape, and a second fiber lead-out hole 5-1 is formed in the center of the upper end of the housing 5; the upper end of the shell 5 is provided with 4 second counter bores 5-2 for fixing the thin-wall square cylinder fixing seat 2; third threaded holes 5-3 are formed in two end faces of the shell 5, and fourth threaded holes 5-4 are formed in the upper side and the lower side of the shell 5; one end of the roller elastic bracket 6 is fixed with a fourth threaded hole 5-4 on the shell 5 through a screw.
Specifically, one end of the roller bracket 7 is provided with a rectangular groove for placing and fixing the roller elastic bracket 6; the other end of the roller wheel bracket 7 is provided with a groove, and the end surfaces of the two sides of the groove are provided with through holes; the roller 8 is arranged in a groove of the roller bracket 7 through a roller pin, and the roller pin is in interference fit with through holes at two ends of the groove of the roller bracket 7 and is used for preventing the roller pin from sliding and falling off; the central hole of the roller 8 is in clearance fit with the roller pin, and is used for ensuring the free rotation of the roller.
Specifically, the sensor further comprises an upper hanging plate 3 and a lower hanging plate 9, wherein the upper hanging plate 3 and the lower hanging plate 9 have the same structure and are respectively fixed on the upper end surface and the lower end surface of the shell 5 through screws; as shown in fig. 4, the bottom of the upper hanging plate 3 is provided with 6 first counter bores 3-5 for connecting and fixing the hanging plate 3 and the housing 5; a steel wire rope hole 3-2 is formed in the center of the upper end of the upper hanging plate 3, and 3 steel wire rope thread fixing holes 3-3 are formed in the side face of the steel wire rope hole 3-2 and used for locking steel wire ropes; a third optical fiber leading-out hole 3-1 is arranged beside the steel wire rope hole 3-2; the center of the bottom of the hanging plate 3 is provided with a large-diameter round hole 3-4, which is convenient for leading out optical fibers.
Specifically, as shown in fig. 6, the assembled sensors are connected in series through steel wire ropes fixed on the upper hanging plate 3 and the lower hanging plate 9, a plurality of sensors are connected in series to realize distributed monitoring, and the distance between the sensors connected in series is adjusted through the length of the steel wire ropes.
The principle of the two-dimensional inclination and vibration simultaneous measurement of the utility model is shown in fig. 7, the sensor is fixed on an inclination calibration table in a laboratory, different inclination states are set, wavelength drift amounts in different states are obtained, and a function relation of inclination and wavelength drift amounts is obtained through data processing; during side slope monitoring, reversely deducing the inclination degree of a side slope according to a function relation obtained by calibrating the obtained drift amount of the actual wavelength; in order to eliminate the influence of the environmental temperature on the monitoring result, the difference value of the wavelength drift amounts of a pair of fiber gratings pasted on the left and right directions of the thin-wall square cylinder 1 is used as an output signal in the X direction, and the difference value of the wavelength drift amounts of a pair of fiber gratings pasted on the front and back directions is used as an output signal in the Y direction, so that the two-dimensional inclination monitoring is realized; the slope can also integrally move in the safety monitoring process of the slope, the integral movement can inevitably cause sudden vibration, the round ball 4 can drive the thin-wall square cylinder 1 to generate vibration deformation under the vibration condition, the fiber bragg grating senses the vibration deformation of the thin-wall square cylinder 1 to generate corresponding wavelength drift, but the wavelength change caused by vibration information is fluctuation in a short time, the wavelength drift caused by inclination is slowly increased or reduced, according to the characteristics of the wave form, the slowly increased or reduced wavelength is regarded as the inclination change, the wavelength with violent fluctuation in a short time is regarded as the vibration, the part of the wavelength fluctuation is the fluctuation up and down of the wavelength caused by the sudden vibration on the basis of the deformation inclination, and therefore, the central fluctuation value of the fluctuation wavelength is regarded as the deformation inclination data; for the vibration information, the vibration information is picked up by fast Fourier transform to obtain the vibration intensity value of the frequency domain, so that the intensity of the slope vibration is obtained.
Examples
As shown in fig. 1, the fiber grating sensor for simultaneously measuring two-dimensional inclination and vibration mainly comprises a thin-wall square cylinder 1, a thin-wall square cylinder fixing seat 2, an upper hanging plate 3, a round ball 4, a shell 5, a roller elastic support 6, a roller support 7, a roller 8 and a lower hanging plate 9. The round ball 4 is placed in the thin-wall square cylinder 1, the round ball 4 is tangent to 4 inner walls of the side face of the thin-wall square cylinder 1, the tangent positions are fixed in an adhesive mode, and 4 fiber gratings are adhered to the outer wall of the thin-wall square cylinder 1 opposite to the adhesive position.
After the fiber bragg gratings are well adhered, the optical fibers at the upper end of the thin-wall square cylinder 1 are led out through the first optical fiber leading-out holes 2-3 of the thin-wall square cylinder fixing seat 2, and the thin-wall square cylinder fixing seat 2 is slowly inserted into the thin-wall square cylinder 1, so that the first threaded holes 2-1 in the thin-wall square cylinder fixing seat 2 are aligned to the through holes at the upper end of the thin-wall square cylinder 1 and fixedly connected through screws.
Leading out the optical fiber led out from the first optical fiber lead-out hole 2-3 of the thin-wall square cylinder fixing seat 2 from the second optical fiber lead-out hole 5-1 at the upper end through the hollow bottom of the shell 5, sending the fixed thin-wall square cylinder 1 and the fixed thin-wall square cylinder fixing seat 2 into the hollow cylinder of the shell 5, aligning the second threaded hole 2-2 at the upper end of the thin-wall square cylinder fixing seat 2 with the second countersunk hole 5-2 at the upper end of the shell 5, and using a screw to pass through the second countersunk hole 5-2 and be screwed on the second threaded hole 2-2 at the upper end of the thin-wall square cylinder fixing seat 2 to realize fixation.
And (3) leading the optical fiber led out from the second optical fiber leading-out hole 5-1 of the shell 5 to sequentially pass through a large-diameter round hole 3-4 at the lower end of the upper hanging plate 3 and a third optical fiber leading-out hole 3-1 at the upper end, and aligning and connecting and fixing the first countersunk hole 3-5 of the foot of the upper hanging plate 3 and a third threaded hole 5-3 on the end surface of the shell 5 by using a screw. The installation of the lower hanging plate 9 is the same as the installation steps of the upper hanging plate 3, and the optical fibers led out from the upper hanging plate 3 and the lower hanging plate 9 are protected by adopting an armored pipe.
The roller elastic bracket 6 is an elastic sheet which is folded at a certain angle, a screw passes through a through hole at one end of the elastic sheet and is screwed in a fourth threaded hole 5-4 on the shell 5, and the other end of the elastic sheet is inserted into a rectangular groove of the roller bracket 7 and is fixed by the screw.
The roller bracket 7 is provided with a groove for placing a roller 8, 2 through holes are arranged on two sides of the groove, the roller 8 is placed in the groove, a roller pin passes through the through holes on two sides of the groove and the central hole of the roller 8, and the roller pin is in interference fit with the through holes on two sides of the groove, so that the roller pin is ensured not to slide and fall off; the roller pin is in clearance fit with the central hole of the roller, so that the roller can rotate freely.
In a high-risk slope, the assembled sensors can be sequentially connected and fixed through steel wire ropes through steel wire rope holes of upper and lower hanging plates of the sensors, so that the series connection of the sensors is realized, n (n belongs to Z and n is larger than or equal to 2) sensors can be connected in series according to requirements, and distributed measurement is realized, as shown in fig. 6.
The working principle of the utility model is as follows: when the sensor is vertically arranged in the axial direction and is in a non-inclined state, when the slope is slowly accumulated, deformed and inclined, the spherical ball 4 drives the side thin wall of the thin-wall square cylinder 1 to deform due to gravity, the fiber bragg grating pasted on the thin wall senses strain, and the central wavelength shifts. In a laboratory, a sensor is fixed on an inclination angle calibration table, different inclination states are set, wavelength drift amounts in different states are obtained, and a functional relation between the inclination and the wavelength drift amounts is obtained through data processing. During slope monitoring, the obtained drift amount of the actual wavelength reversely deduces the slope inclination degree through a functional relation obtained by calibration. The fiber grating is adhered to the thin-wall square cylinder 1 in 4 directions, namely, the front direction, the rear direction, the left direction and the right direction, as shown in fig. 2, in order to eliminate the influence of the environmental temperature, the difference value of the wavelength drift amounts of the first fiber grating 10 and the third fiber grating 12 in the left and right directions is used as an output signal in the X direction, the difference value of the wavelength drift amounts of the second fiber grating 11 and the fourth fiber grating 13 in the front and rear directions is used as an output signal in the Y direction, and the two-dimensional inclination monitoring is realized. When the slope is inclined by accumulated deformation, the slope can also integrally move, the integral movement can inevitably cause sudden vibration, when the sudden vibration is encountered, the round ball 4 can drive the thin wall of the thin-wall square cylinder 1 to generate positive and negative alternate strain, the wavelength of the fiber grating adhered to the thin-wall square cylinder 1 can also drift, but the characteristics of the wavelength change of the fiber grating caused by the accumulated deformation and the sudden vibration are different, the wavelength change caused by the accumulated deformation and the inclination of the slope is slowly and monotonously increased or reduced, the wavelength change caused by the sudden vibration is fluctuation in a short time, according to the characteristics of the change, the slowly increased or reduced wavelength is regarded as the accumulated deformation and the inclination is caused, and the wavelength which is severely fluctuated in the short time is regarded as the vibration. The part of the wavelength fluctuation is the fluctuation of the wavelength caused by the sudden vibration on the basis of the deformation inclination, so the central fluctuation value of the fluctuation wavelength is still regarded as the data of the deformation inclination. And (3) picking up the vibration information by using Fast Fourier Transform (FFT) to obtain the vibration intensity value of the frequency domain of the vibration information, obtaining the intensity of the vibration of the side slope soil body, and realizing the simultaneous measurement of two-dimensional inclination and vibration.
The above description is only for the preferred embodiment of the present invention and should not be taken as limiting the invention, and any modifications, equivalent replacements, and improvements made within the spirit and principle scope of the present invention should be included within the protection scope of the present invention.
Claims (9)
1. The utility model provides a two-dimentional slope and vibration simultaneous measurement's fiber grating sensor which characterized in that: the method comprises the following steps: the device comprises a thin-wall square barrel (1), a thin-wall square barrel fixing seat (2), a ball (4), a shell (5), a roller elastic support (6), a roller support (7), a roller (8) and a plurality of fiber gratings; the shell (5) is a hollow cylinder with an open bottom end; the thin-wall square cylinder (1) is fixedly connected with the thin-wall square cylinder fixing seat (2), and the thin-wall square cylinder fixing seat are fixed in the shell (5) together; the round ball (4) is a hollow round ball with a certain wall thickness and is positioned in the thin-wall square cylinder (1); the roller elastic support (6) is an elastic sheet folded at a certain angle, one end of the roller elastic support is fixed on the shell (5), and the other end of the roller elastic support is fixedly connected with the roller support (7); the roller bracket (7) is used for mounting a roller (8); the fiber gratings are respectively adhered to the outer wall surface of the thin-wall square cylinder (1) for measurement.
2. The fiber grating sensor for simultaneous two-dimensional tilt and vibration measurement according to claim 1, wherein: the roller elastic support (6), the roller support (7) and the rollers (8) are four, one roller elastic support (6), one roller support (7) and one roller (8) form a group, and the four groups are respectively positioned on two sides of the upper end and the lower end of the shell (5).
3. The fiber grating sensor for simultaneous two-dimensional tilt and vibration measurement according to claim 1, wherein: the upper end of the thin-wall square cylinder (1) is provided with a through hole, and the thin-wall square cylinder is fixed with the thin-wall square cylinder fixing seat (2) through the through hole; the upper ends of 4 side surfaces of the thin-wall square cylinder (1) are also provided with grooves for leading out optical fibers.
4. The fiber grating sensor for simultaneous two-dimensional tilt and vibration measurement according to claim 1, wherein: a first threaded hole (2-1) is formed in the boss at the lower end of the thin-wall square cylinder fixing seat (2) and used for connecting and fixing the thin-wall square cylinder fixing seat (2) and the thin-wall square cylinder (1); the upper end face of the thin-wall square cylinder fixing seat (2) is provided with 4 second threaded holes (2-2) for connecting and fixing the thin-wall square cylinder fixing seat (2) and the shell (5); a first optical fiber leading-out hole (2-3) is arranged at the central position of the upper end surface of the thin-wall square cylinder fixing seat (2) and used for leading out optical fibers.
5. The fiber grating sensor for simultaneous two-dimensional tilt and vibration measurement according to claim 1, wherein: the number of the fiber gratings is four, and the fiber gratings are respectively a first fiber grating (10), a second fiber grating (11), a third fiber grating (12) and a fourth fiber grating (13); the round balls (4) are tangent to the four inner walls of the thin-wall square cylinder (1), and the round balls (4) and the thin-wall square cylinder (1) are fixed at the 4 tangent points by adopting an adhesive; the first fiber bragg grating (10), the second fiber bragg grating (11), the third fiber bragg grating (12) and the fourth fiber bragg grating (13) are respectively stuck to the outer wall of the thin-wall square cylinder (1) corresponding to the tangent position of the round ball (4) and the thin-wall square cylinder (1).
6. The fiber grating sensor for simultaneous two-dimensional tilt and vibration measurement according to claim 1, wherein: the inner part of the shell (5) is a hollow cylinder with an open bottom end, the outer part of the shell is in a hexagonal shape, and a second optical fiber leading-out hole (5-1) is formed in the center of the upper end of the shell (5); the upper end of the shell (5) is provided with 4 second counter bores (5-2) for fixing the thin-wall square cylinder fixing seat (2); third threaded holes (5-3) are formed in two end faces of the shell (5), and fourth threaded holes (5-4) are formed in the upper side and the lower side of the shell (5); one end of the roller elastic support (6) is fixed with a fourth threaded hole (5-4) on the shell (5) through a screw.
7. The fiber grating sensor for simultaneous two-dimensional tilt and vibration measurement according to claim 1, wherein: one end of the roller bracket (7) is provided with a rectangular groove for placing and fixing the roller elastic bracket (6); the other end of the roller wheel bracket (7) is provided with a groove, and the end surfaces of the two sides of the groove are provided with through holes; the roller (8) is arranged in a groove of the roller bracket (7) through a roller pin, and the roller pin is in interference fit with through holes at two ends of the groove of the roller bracket (7) and is used for preventing the roller pin from sliding and falling off; the central hole of the roller (8) is in clearance fit with the roller pin and is used for ensuring the free rotation of the roller.
8. A two-dimensional tilt and vibration simultaneously measuring fiber grating sensor according to any one of claims 1 to 7, wherein: the sensor also comprises an upper hanging plate (3) and a lower hanging plate (9), wherein the upper hanging plate (3) and the lower hanging plate (9) have the same structure and are respectively fixed on the upper end surface and the lower end surface of the shell (5) through screws; the bottom of the upper hanging plate (3) is provided with 6 first counter bores (3-5) for connecting and fixing the hanging plate (3) and the shell (5); a steel wire rope hole (3-2) is formed in the center of the upper end of the upper hanging plate (3), and 3 steel wire rope thread fixing holes (3-3) are formed in the side face of the steel wire rope hole (3-2) and used for locking a steel wire rope; a third optical fiber leading-out hole (3-1) is arranged beside the steel wire rope hole (3-2); the center of the bottom of the hanging plate (3) is provided with a large-diameter round hole (3-4) which is convenient for leading out optical fibers.
9. The fiber grating sensor for simultaneous two-dimensional tilt and vibration measurement according to claim 8, wherein: the assembled sensors are connected in series through the steel wire ropes fixed on the upper hanging plate (3) and the lower hanging plate (9), a plurality of sensors are connected in series to realize distributed monitoring, and the distance between the sensors connected in series is adjusted through the length of the steel wire ropes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201920916580.7U CN210464535U (en) | 2019-06-18 | 2019-06-18 | Fiber grating sensor for simultaneously measuring two-dimensional inclination and vibration |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920916580.7U CN210464535U (en) | 2019-06-18 | 2019-06-18 | Fiber grating sensor for simultaneously measuring two-dimensional inclination and vibration |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110186514A (en) * | 2019-06-18 | 2019-08-30 | 武汉科技大学 | The fiber-optic grating sensor and its measurement method of two dimension inclination and vibration while measurement |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110186514A (en) * | 2019-06-18 | 2019-08-30 | 武汉科技大学 | The fiber-optic grating sensor and its measurement method of two dimension inclination and vibration while measurement |
| CN110186514B (en) * | 2019-06-18 | 2023-09-12 | 武汉科技大学 | Fiber bragg grating sensor for simultaneously measuring two-dimensional inclination and vibration and measuring method thereof |
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