KR20110109164A - High sensitivity acceleration and inclination measurement device using optical fiber sensor - Google Patents
High sensitivity acceleration and inclination measurement device using optical fiber sensor Download PDFInfo
- Publication number
- KR20110109164A KR20110109164A KR1020100028767A KR20100028767A KR20110109164A KR 20110109164 A KR20110109164 A KR 20110109164A KR 1020100028767 A KR1020100028767 A KR 1020100028767A KR 20100028767 A KR20100028767 A KR 20100028767A KR 20110109164 A KR20110109164 A KR 20110109164A
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- South Korea
- Prior art keywords
- cantilever
- optical fiber
- mass
- inclinometer
- accelerometer
- Prior art date
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C19/00—Gyroscopes; Turn-sensitive devices using vibrating masses; Turn-sensitive devices without moving masses; Measuring angular rate using gyroscopic effects
- G01C19/56—Turn-sensitive devices using vibrating masses, e.g. vibratory angular rate sensors based on Coriolis forces
- G01C19/5642—Turn-sensitive devices using vibrating masses, e.g. vibratory angular rate sensors based on Coriolis forces using vibrating bars or beams
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C9/00—Measuring inclination, e.g. by clinometers, by levels
- G01C9/12—Measuring inclination, e.g. by clinometers, by levels by using a single pendulum plumb lines G01C15/10
- G01C9/14—Measuring inclination, e.g. by clinometers, by levels by using a single pendulum plumb lines G01C15/10 movable in more than one direction
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
- G01P15/02—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses
- G01P15/03—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses by using non-electrical means
- G01P15/032—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses by using non-electrical means by measuring the displacement of a movable inertial mass
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
- G01P15/02—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses
- G01P15/08—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values
- G01P15/097—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values by vibratory elements
- G01P15/10—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values by vibratory elements by vibratory strings
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Light Guides In General And Applications Therefor (AREA)
Abstract
The present invention relates to a high sensitivity accelerometer and an inclinometer using an optical fiber sensor, and an object of the present invention is to significantly improve the measurement sensitivity without designing an increase in the volume of the device, such as increasing the weight of the mass or increasing the length of the cantilever. In the case where the measurement sensitivity of the accelerometer / inclinometer installed in the structure is required or the measurement sensitivity of the manufactured device is needed, the high sensitivity accelerometer and the inclinometer using the optical fiber sensor can be easily converted. will be.
High sensitivity accelerometer and inclinometer using the optical fiber sensor according to the present invention for achieving the above object is a cantilever configured to bend deformation by external force; A fixing member coupled to one end of the cantilever to fix the cantilever to a structure; A mass body coupled to the other end of the cantilever to induce a bending operation of the cantilever by moving the structure; And an optical fiber cable having at least one optical fiber sensor, wherein one side of the optical fiber cable is fixed on the fixing member and the other side is fixed on the mass body so that the optical fiber sensor is disposed to maintain a distance from the cantilever at a predetermined distance. It is characterized by that.
Description
The present invention relates to an accelerometer and an inclinometer, and more particularly, to configure an accelerometer / inclinometer having a cantilever structure using an optical fiber sensor, the optical fiber sensor is configured to be arranged to maintain a distance spaced apart from the cantilever, and an additional mass easily. The present invention relates to a highly sensitive accelerometer / inclinometer that can be additionally mounted and configured to arbitrarily adjust the prestress.
Acceleration and slope are very important physical quantities for monitoring safety-related factors such as deformation and settlement of structures such as bridges and structures.Typically, acceleration and inclination are measured after connecting an accelerometer or inclinometer to the structure. Evaluate the condition. As such, various accelerometers / inclinometers have been proposed to be installed in structures to measure the state of objects.
FIG. 1 is a schematic diagram illustrating an apparatus of an accelerometer / inclinometer using a weight member of a conventional cantilever structure.
Referring to the accelerometer / inclinometer of the conventional cantilever structure with reference to FIG. 1, one end of the
Recently, in order to solve the above problems, an accelerometer / inclinometer using an optical fiber sensor has been widely developed and applied. Looking at an accelerometer / inclinometer using a conventional fiber bragg grating (FBG), it takes the configuration of a conventional electric accelerometer / inclinometer having a strain gauge attached to at least one surface of a cantilever equipped with a mass at one end, but the electric strain gauge In place of the at least one optical fiber sensor is configured to attach to at least one surface of the cantilever.
Hereinafter, the disadvantages and limitations of the accelerometer / inclinometer using a conventional optical fiber sensor will be described.
In general, the stress of the beam structure is as shown in
(f: stress, M: moment (pL), p: load (or mass), L: distance, I: cross-sectional secondary moment, y: distance away from neutral axis)
Therefore, as shown in
However, in the case of an accelerometer / inclinometer using a conventional optical fiber sensor, as shown in FIG. 1, the optical fiber sensor is directly attached and fixed on one surface of the cantilever, and thus a distance y from the neutral axis of the cantilever is very small. Therefore, in order to increase the measurement sensitivity of the accelerometer / inclinometer, it was inevitable to take a method of increasing the mass (p) or increasing the length of the cantilever itself to increase the "L".
However, this method is very inefficient considering the increase in the measurement sensitivity compared to the increase in the device volume (i.e., the increase in the mass and the cantilever) and the installation space of the device, so that the accelerometer / tilt system of the conventional cantilever structure using the optical fiber sensor There was a limit to significantly improving the measurement sensitivity.
The required sensitivity is also varied according to the characteristics of various objects (structures), and even the same structure may require the installation of accelerometers / inclinometers with different measurement sensitivities for each location depending on the ground structure and surrounding environment. In some cases, it may be necessary to change the measurement sensitivity of accelerometers / inclinometers already installed in specific structures, for example due to climate and ground changes.
However, the conventional accelerometer / inclinometer having a cantilever structure using an optical fiber sensor has no means for adjusting the measurement sensitivity of the device, and thus it is difficult to flexibly respond to the above-described requirements, and once a specific accelerometer / inclinometer is installed in a specific structure, If it is necessary to recalibrate the measurement sensitivity later, it was impossible to cope with it. Therefore, another accelerometer / inclinometer had to be manufactured and reinstalled.
The present invention has been made to solve the above problems, an object of the present invention can significantly improve the sensitivity of the measurement without the design action to increase the weight of the mass, or increase the volume of the device, such as increasing the length of the cantilever To provide a high sensitivity accelerometer and inclinometer using an optical fiber sensor.
Another object of the present invention is to provide an optical fiber sensor that can easily convert the measurement sensitivity in response to the need to change the measurement sensitivity of the accelerometer / inclinometer installed on the structure or to adjust the measurement sensitivity of the manufactured device It is to provide a high sensitivity accelerometer and inclinometer used.
High sensitivity accelerometer and inclinometer using the optical fiber sensor according to the present invention for achieving the above object is a cantilever configured to bend deformation by external force; A fixing member coupled to one end of the cantilever to fix the cantilever to a structure; A mass body coupled to the other end of the cantilever to induce a bending operation of the cantilever by moving the structure; And an optical fiber cable having at least one optical fiber sensor, wherein one side of the optical fiber cable is fixed on the fixing member and the other side is fixed on the mass body so that the optical fiber sensor is disposed to maintain a distance from the cantilever at a predetermined distance. It is characterized by that.
According to the high-sensitivity accelerometer and inclinometer using the optical fiber sensor according to the present invention, the weight of the mass body or the cantilever of the cantilever is increased by the optical fiber sensor installation structure that is disposed while maintaining a distance spaced from the cantilever by using the fixing member and the mass body. There is a remarkable effect that the measurement sensitivity can be greatly improved without increasing the device volume, such as increasing the length.
In addition, it is possible to selectively mount a number of additional mass can easily adjust the load applied to the cantilever, accordingly there is an excellent advantage to implement an accelerometer / inclinometer having various measurement sensitivity.
In addition, by configuring a mass body having an insertion groove and a fastening hole and fine adjustment of the position at which the cantilever fastening portion is inserted and fixed in the mass insertion groove, the amount of prestress applied to the optical fiber sensor is artificially adjusted for optimal measurement. It has an excellent effect of setting the sensitivity and the desired measuring range.
1 is a schematic diagram of a device illustrating an accelerometer / inclinometer using a weight member of a conventional cantilever structure.
Figure 2 is a schematic block diagram showing the structure of a high sensitivity accelerometer and inclinometer using the optical fiber sensor according to the present invention.
Figure 3 is an exploded perspective view of a high sensitivity accelerometer and inclinometer using the optical fiber sensor in accordance with a preferred embodiment of the present invention.
4 is a perspective view of the combination of FIG.
Figure 5 (a) and (b) is a side view showing a method for performing fine adjustment of the measurement sensitivity by adjusting the detailed position of the additional mass coupled to the fixing screw of the present invention.
6 is a perspective view showing another embodiment of the additional mass according to the present invention.
FIG. 7 is a cross-sectional view of FIG. 4 for explaining a pre-stressing control means of a high sensitivity accelerometer and an inclinometer using an optical fiber sensor according to the present invention; FIG.
The high sensitivity accelerometer / inclinometer using the optical fiber sensor according to the present invention uses a fixed member and a mass to maintain a distance spaced apart from the cantilever by a predetermined distance, and an optical fiber sensor installation structure and load and prestressing can be adjusted. The mass structure is designed to allow arbitrary adjustment of the measurement sensitivity and to provide technical features that can greatly improve the precision.
Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment, advantages and features of the present invention.
Figure 2 is a schematic block diagram showing the structure of a high sensitivity accelerometer and inclinometer using the optical fiber sensor according to the present invention.
2, the high sensitivity accelerometer and the inclinometer using the optical fiber sensor according to the present invention, one side of the
According to the installation structure of the
For example, assume that the "y" value of the accelerometer / inclinometer of the cantilever structure using the conventional
This is because an accelerometer / inclinometer having a cantilever structure using a conventional
3 is an exploded perspective view of a high sensitivity accelerometer and an inclinometer using an optical fiber sensor according to a preferred embodiment of the present invention, and FIG. 4 is a combined perspective view of FIG. 3.
First, referring to FIG. 3, a high sensitivity accelerometer and an inclinometer according to an embodiment of the present invention may include a
The
The
The
The
In addition, the
The
In addition, the
The
In addition, the high-sensitivity accelerometer and inclinometer using the
The
In order to overcome the above problems, the accelerometer / inclinometer of the present invention can be readjusted to easily and additionally attach
In other words, by selectively adding the
In addition, through the structure in which the
That is, the fine adjustment of the fine sensitivity is possible by finely adjusting the distance of "L" in "M = pL" of
For example, if you want to improve the measurement sensitivity of an accelerometer / inclinometer with a sensitivity of 900pm / g to a large width (for example, 100pm / g) and convert it to an accelerometer / inclinometer with a sensitivity of 1000pm / g, simply add the additional mass (60). By adding it, a measurement sensitivity can be improved significantly. However, in order to further improve the measurement sensitivity of the accelerometer / inclinometer readjusted to have a measurement sensitivity of 1000 pm / g (for example, 30 pm / g),
In this case, as shown in FIG. 5, the fine position of the
6 is a perspective view showing another embodiment of the additional mass according to the present invention.
The
The
According to the preferred embodiment of FIG. 4, one side and the other side of the
The fixing
The
The
The measuring device refers to a conventional computer device for analyzing the deformation degree of the structure by receiving data signals output from the
FIG. 7 is a cross-sectional view of FIG. 4 illustrating a pre-stressing control means of a high sensitivity accelerometer and an inclinometer using the
In general, the measurement range of the FBG strain sensor is 0-10,000 με. Therefore, when fixing both ends of the
If it is used as an accelerometer as shown in FIG. 7, it is assumed that the
In the initial setting state as described above, it is assumed that the additional mass of the present invention is added in order to increase the measurement sensitivity of the accelerometer later. In this case, the
In order to achieve this object, the accelerometer / inclinometer of the present invention forms an
That is, the
In addition, in the case of an accelerometer having a sensitivity of 1,000 με / g, assuming that only 1,000 με of prestress is applied, the acceleration measurement range capable of measuring acceleration using this is 1,000 με, that is, 1 g. . However, if the pre-stress was readjusted to 5,000 mu ε using the pre-stress control structure described above, the acceleration range that can be measured is easily adjusted to 5 g.
With the same method as described above, it is possible to add additional mass to not only the accelerometer but also the inclinometer and easily adjust the corresponding prestress, so that the user can realize the accelerometer / inclinometer having various measurement sensitivity with a simple operation. There is.
While the preferred embodiments of the present invention have been described and illustrated using specific terms, such terms are only for clarity of the present invention, and the embodiments and the described terms of the present invention are defined and the technical spirit and scope of the following claims. It is obvious that various changes and changes can be made without departing from the scope.
For example, in the construction of the accelerometer / inclinometer of the present invention, the end of the
In the above description, the accelerometer in the high-sensitivity accelerometer and inclinometer using the optical fiber sensor of the present invention has been described and illustrated by way of example. It will be apparent to those skilled in the art that if installed on the structure facing the direction of gravity can be used as an inclinometer.
Such modified embodiments should not be understood individually from the spirit and scope of the present invention, but should be regarded as being within the scope of the claims of the present invention.
10: cantilever 11: cantilever fastening portion
13
21: mass insertion groove 22: fastening hole
23: fixing bolt 24: fixing screw
30: fixing member 40: optical fiber cable
45: optical fiber sensor 50: fixing agent
60, 70a, 70b: additional mass
Claims (5)
A fixing member coupled to one end of the cantilever to fix the cantilever to a structure;
A mass body coupled to the other end of the cantilever to induce a bending operation of the cantilever by moving the structure; And
It includes an optical fiber cable having at least one optical fiber sensor,
One side of the optical fiber cable is fixed on the fixing member and the other side is fixed on the mass body, the optical sensor is a high sensitivity accelerometer and inclinometer using an optical fiber sensor, characterized in that arranged to maintain a distance spaced apart from the cantilever.
The optical fiber cable is a high sensitivity accelerometer and inclinometer using an optical fiber sensor, characterized in that fixed to the surface of the fixing member and the mass through a fixing agent.
The fixing agent is a resin adhesive including an epoxy resin,
The optical fiber cable is a high sensitivity accelerometer and inclinometer using an optical fiber sensor, characterized in that fixed to be disposed in the upper region of the bending direction side of the cantilever.
The cantilever may include a plate-shaped or beam-shaped bending part that performs a bending operation according to movement of a structure; And a fastening part formed to extend from one end of the bending part and inserted into and coupled to the mass body.
The mass body has an insertion groove for receiving the cantilever fastening portion therein; A fastening hole penetrating from one side of the mass body to the insertion groove; And a fixing bolt penetrating the fastening hole and screwing the end thereof to protrude into the insertion groove to fix the cantilever fastening portion inserted into the insertion groove.
The cantilever fastening unit is a high-sensitivity accelerometer and inclinometer using an optical fiber sensor, characterized in that configured to adjust the fixed position in the insertion groove by adjusting the position disposed in the mass insertion groove fixed by the fixing bolt.
Further comprising at least one additional mass detachably coupled to the mass,
A fixing screw protrudes from one side of the mass, and the additional mass is screwed to the fixing screw.
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101718411B1 (en) * | 2016-04-22 | 2017-04-04 | (주)카이센 | Underground deformation measuring apparatus |
CN109374000B (en) * | 2018-11-12 | 2021-05-14 | 浙江大学 | High-precision real-time monitoring system for positioning and deformation of long-distance submarine cable |
CN113109592A (en) * | 2021-04-25 | 2021-07-13 | 武汉理工大学 | Cantilever beam type three-dimensional FBG acceleration sensor |
CN114705885A (en) * | 2022-04-01 | 2022-07-05 | 武汉理工大学 | Fiber bragg grating acceleration sensor of stepped cantilever beam and measuring method thereof |
CN116609548A (en) * | 2023-07-20 | 2023-08-18 | 山东省科学院激光研究所 | Three-dimensional optical fiber acceleration sensor system capable of measuring inclination angle |
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2010
- 2010-03-30 KR KR1020100028767A patent/KR20110109164A/en not_active Application Discontinuation
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101718411B1 (en) * | 2016-04-22 | 2017-04-04 | (주)카이센 | Underground deformation measuring apparatus |
CN109374000B (en) * | 2018-11-12 | 2021-05-14 | 浙江大学 | High-precision real-time monitoring system for positioning and deformation of long-distance submarine cable |
CN113109592A (en) * | 2021-04-25 | 2021-07-13 | 武汉理工大学 | Cantilever beam type three-dimensional FBG acceleration sensor |
CN113109592B (en) * | 2021-04-25 | 2023-08-22 | 武汉理工大学 | Cantilever beam type three-dimensional FBG acceleration sensor |
CN114705885A (en) * | 2022-04-01 | 2022-07-05 | 武汉理工大学 | Fiber bragg grating acceleration sensor of stepped cantilever beam and measuring method thereof |
CN114705885B (en) * | 2022-04-01 | 2024-05-03 | 武汉理工大学 | Fiber bragg grating acceleration sensor of stepped cantilever beam and measuring method thereof |
CN116609548A (en) * | 2023-07-20 | 2023-08-18 | 山东省科学院激光研究所 | Three-dimensional optical fiber acceleration sensor system capable of measuring inclination angle |
CN116609548B (en) * | 2023-07-20 | 2023-11-03 | 山东省科学院激光研究所 | Three-dimensional optical fiber acceleration sensor system capable of measuring inclination angle |
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