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 PDF

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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
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cantilever
optical fiber
mass
inclinometer
accelerometer
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KR1020100028767A
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Korean (ko)
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이규완
정성훈
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(주)카이센
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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

HIGH SENSITIVITY ACCELERATION AND INCLINATION MEASUREMENT DEVICE USING OPTICAL FIBER SENSOR}

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 cantilever 1 is fixed to the structure 3 and the other end has a structure installed without being supported by the mass body 2. In particular, the accelerometer / inclinometer of the conventional cantilever structure measures the strain of the structure by attaching an electric strain gauge 4 on the surface of the cantilever 1, and the electric strain gauge 4 is connected to the deformation of the structure to the cantilever ( 1) is a method of measuring the strain of the object using the phenomenon of bending. That is, when deformation occurs in the structure, the cantilever 1 is bent in the opposite direction to the displacement of the structure due to the inertia of the mass 2 connected to the other end of the cantilever 1, thereby on the face of the cantilever 1 The electrical resistance of the attached strain gages 4 changes so that the strain can be measured therefrom. However, the accelerometer / inclinometer configured to attach electric strain gages to the cantilever is inconvenient because the strain gauges are not durable enough and multiplexing is not possible, so a separate cable must be installed for each strain gage installed in a structure. It was not easy to manage, and there was a limit in that accurate physical quantity measurement was difficult due to the possibility of interference of electrical signals and noise.

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 Equation 1 below.

Figure pat00001

(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 Equation 1, assuming that the same acceleration or tilt angle is generated in the accelerometer / inclinometer made of the same cantilever and mass, "I" and "M" are the same. Structural stress, ie, the sensitivity or precision of the accelerometer / inclinometer, will vary.

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 optical fiber cable 40 connected in series with the optical fiber sensor 45 is fixed to the fixing member 30 and the other side to the mass body 20. The fixed structure allows the optical fiber sensor 45 to be disposed while maintaining a distance spaced from the cantilever 10 by a predetermined distance. Thus, "y (Equation 1: Distance away from the neutral axis)" of the accelerometer / inclinometer using the cantilever structure can be obtained. It is configured to maximize.

According to the installation structure of the optical fiber sensor 45 of the present invention as described above it is possible to significantly improve the measurement sensitivity for the following reasons.

For example, assume that the "y" value of the accelerometer / inclinometer of the cantilever structure using the conventional optical fiber sensor 45 of FIG. 1 is "1" and the measurement sensitivity accordingly is 10 pm / g. In the case of the present invention, assuming that the same accelerometer / inclinometer of FIG. 1 is configured using the same mass body 20 and the same cantilever 10, the accelerometer / inclinometer of the present invention is at least 10 times larger than that of FIG. A value of “y” may be assigned, and accordingly, measurement sensitivity of 100 pm / g or more may be realized by Equation 1.

This is because an accelerometer / inclinometer having a cantilever structure using a conventional optical fiber sensor 45 has a very small value of "y", thereby increasing the weight p of the mass 20 or the length L of the cantilever 10. Device volume, such as increasing the weight of the bar mass 20 or increasing the length of the cantilever 10, can increase the beam structure stress (i.e. the accelerometer / inclinometer's measurement sensitivity) to a much greater width. There is an excellent effect that can greatly improve the measurement sensitivity without increasing the.

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 fixing member 30, a cantilever 10, a mass 20, a weight, an optical fiber sensor 45, and an optical fiber cable 40. It is configured to include. The fixing member 30 and the mass body 20 is composed of a polyhedral member, but preferably in a rectangular parallelepiped shape. This is because the optical fiber cable 40 of the present invention is advantageous in that it can be attached and fixed on the surface of the fixing member 30 and the mass body 20 in the same direction as the long axis of the cantilever 10.

The fixing member 30 of the present invention is an element for fixing one end of the cantilever 10 to a measurement target (that is, a structure such as a bridge or a building) and may be integrally formed with the cantilever 10 and mounted on the structure. , The preferred embodiment of the present invention is configured as a separate object so that a predetermined area of the end of the cantilever 10 can be inserted into the fixing member 30, the end of the cantilever 10 inserted into the fixing member 30 is It was configured to be coupled fixed by the bolt 31 penetrating the fixing member (30). For reference, since the fixing member 30 is merely a mechanism for easily mounting and fixing one end of the cantilever 10 to the structure, the fixing member 30 is omitted and the cantilever 10 itself is a structure. Of course, the cantilever 10 may be fixed to the fixing member 30 to the structure through a variety of known fastening methods.

The cantilever 10 of the present invention is composed of a shape and a material capable of bending deformation due to an external force, and preferably, a flexible metal material is used. In addition, the shape of the cantilever 10 should be configured with a thickness and a shape in which the bending motion of the cantilever 10 may be caused by an external force transmitted when the movement of the structure (subsidence, deformation, etc.) occurs, for example, a thin elongated plate member or It is preferable to comprise a beam-shaped member.

The cantilever 10 according to the preferred embodiment of the present invention is configured in detail with the bending part 13 and the fastening part 11. As described above, the bending part 13 is a region for performing a bending operation according to the movement of the structure, and is preferably configured in the form of a plate or a beam. Specifically, the bending part 13 is directed toward the mass body 20 as shown in FIG. 3. The cantilever fastening portion 11 is formed to extend in a region corresponding to the vertex of the inverted triangle, and the base of the opposite triangle is fixed to the fixing member 30. Thus, by forming the cantilever bending portion 13 in an inverted triangle shape, the cantilever bending portion 13 reacts sensitively to the mass inertia caused by the structure motion and causes the bending operation to further improve the measurement sensitivity of the device. There is this.

The fastening part 11 allows the cantilever 10 to be coupled to the mass 20, and at the same time, pre-stressing can be arbitrarily adjusted by adjusting the fastening position in the mass insertion groove 21. Play a role. Specifically, the cantilever fastening portion 11 according to the preferred embodiment of the present invention has the same thickness as the cantilever bending portion 13 but at least greater than the transverse direction (X) maximum width of the cantilever bending portion 13. X) A rectangular, wide and flat plate member having a width was formed to extend from one end of the cantilever bend 13. However, since the fastening part 11 is an area for firmly fixing the cantilever 10 rather than causing the bending operation, the thickness does not necessarily have to match the bending part 13.

In addition, the insertion groove 21 of the mass into which the cantilever coupling part 11 is inserted may be configured to have the same shape as that of the coupling part 11 so that the cantilever coupling part 11 may be inserted into and accommodated in the mass insertion groove 21. It is made to be.

The mass body 20 of the present invention is an element for inducing the bending operation of the cantilever 10 due to the movement of the structure (deformation, settlement, etc.), and there is no particular limitation on the material that can be used, and the weight thereof is the acceleration range to be measured ( It may be appropriately selected in consideration of mechanical properties such as the inclination range) and the deformation characteristics of the cantilever 10, but is preferably composed of a steel (Steel) material having a large mass to the volume of the material, "p: load ( Or mass) " is preferred to maximize the beam structure stress (i.e., the accelerometer / inclinometer's measurement sensitivity).

In addition, the mass body 20 of the present invention is provided with an insertion groove 21 and a fastening hole 22 for inserting and fixing the cantilever fastening portion 11 therein. The mass insertion groove 21 is configured in the same shape as the cantilever fastening portion 11 composed of a wide flat rectangular plate member as shown in FIG. 3 so that the cantilever fastening portion 11 fits inside the mass insertion groove 21. It is desirable to be configured to be insert coupled.

The cantilever fastening portion 11 inserted into the mass insertion groove 21 is fixed through a fastening hole 22 penetrating through the vertical upper portion thereof and a fixing bolt 23 penetrating the fastening hole 22. That is, the fastening hole 22 is continuously penetrated from the upper surface of the mass body 20 to the insertion groove 21 region so that both ends are open, and a female thread is formed on the inner circumferential surface. One end of the cantilever fastening portion 11 inserted into the mass inserting groove 21 after the end of the fixing bolt 23 penetrating the fastening hole 22 protrudes into the insertion groove 21 region. By pressing and pressing the cantilever fastening part 11 is fixedly coupled to the mass body 20. Therefore, the fastening hole 22 and the fixing bolt 23 are preferably provided with at least two so as to achieve a firm fixed state of the cantilever fastening portion 11.

In addition, the high-sensitivity accelerometer and inclinometer using the optical fiber sensor 45 of the present invention further includes an additional mass 60 detachably coupled to the mass 20, and the mass 20 is an additional mass fixing screw on one side thereof. 24 is formed to protrude. In the embodiment of Figure 3 is formed through the coupling hole 61 in the center of the additional mass 60 to form a female thread on the inner circumferential surface, the fixing screw 24 forms a male thread on the outer peripheral surface of the coupling hole The additional mass 60 was easily attached to the mass 20 by configuring the 61 to be screwed to the fixing screw 24.

The additional mass 60 is a means for easily adjusting the measurement sensitivity of the apparatus. For example, assume that the measurement sensitivity of the accelerometer / inclinometer of the present invention made of the specific mass 20 is 900 pm / g. In the future, if a device with a higher measuring sensitivity (eg 1000pm / g) is required due to changes in the environment of a structure with an accelerometer / inclinometer of 900pm / g, the accelerometer / inclinometer needs to be manufactured and installed again. This is a wasteful and inefficient problem.

In order to overcome the above problems, the accelerometer / inclinometer of the present invention can be readjusted to easily and additionally attach additional mass 60 of various weights to the accelerometer / inclinometer that has been manufactured and installed to readjust the overall mass. It consists of.

In other words, by selectively adding the additional mass 60, the value of "p: load (or mass)" can be arbitrarily adjusted in Equation 1, so that the measurement sensitivity of the device can be easily adjusted without having to redesign the manufactured accelerometer / inclinometer. There is an advantage to change.

In addition, through the structure in which the additional mass 60, through which the coupling hole 61 is penetrated, is fastened to the fixing screw 24 protruding from the mass 20 as illustrated in FIG. 3, the detailed coupling position of the additional mass 60 is determined. As it can be adjusted, there is an advantage that fine adjustment of measurement sensitivity is also possible as follows.

That is, the fine adjustment of the fine sensitivity is possible by finely adjusting the distance of "L" in "M = pL" of Equation 1, the fine adjustment of the distance of "L" is the detail of the additional mass 60 Achievable by adjusting the relative position of engagement.

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), additional masses 60 having various weights are required to be inefficient. Can be.

In this case, as shown in FIG. 5, the fine position of the additional mass 60 coupled to the fixing screw 24 may be finely adjusted to finely adjust the measurement sensitivity. That is, by closely coupling the additional mass 60 to the mass 20, the measurement sensitivity can be improved to a large width (for example, 100 pm / g) as shown in FIG. 5 (a), and the measurement sensitivity is further narrowed in the above state. (For example, 30 pm / g) If the additional mass 60 is configured to be fixedly fixed at a point spaced apart from the mass 20 by a predetermined distance as shown in FIG. 5 (b), "P ( "L", the distance from the operating point of "load)", is increased to "L + L '", so that the measurement sensitivity can be finely adjusted (i.e., slightly improved).

6 is a perspective view showing another embodiment of the additional mass according to the present invention.

The additional mass 60 described and illustrated in FIG. 3 is configured such that a coupling hole 61 having a female thread formed on an inner circumferential surface thereof penetrates the central axis of the member. However, in another embodiment of the present invention, the additional mass 60 is provided on one side of the additional mass as shown in FIG. Forming the screw groove (71a) and the other side opposite to the coupling screw (72a) is configured to protrude, so that the screw groove (71a) provided on one side of the first additional mass (70a) protruding fixed to the mass 20 The coupling screw 72a which is fastened to the screw 24 and provided on the other side of the first additional mass 70a can be fastened to the screw groove 71b provided in the second additional mass 70b connected in series. It was. As described above, the accelerometer / inclinometer according to the present invention can selectively connect a plurality of additional masses 70a and 70b to easily adjust the load (that is, mass: p) applied to the cantilever 10 and Therefore, there is an excellent advantage to implement an accelerometer / inclinometer having various measurement sensitivity.

The optical fiber sensor 45 of the present invention is characterized in that the fixing member 30 and the mass 20 to maintain the distance spaced apart from the cantilever 10 by a predetermined interval. That is, one side of the optical fiber cable 40 having at least one optical fiber sensor 45 is fixed to the fixing member 30 and the other side is fixed to the mass 20, the optical fiber sensor 45 cantilever 10 By maintaining the distance spaced by a predetermined distance), and to maximize the "y (Equation 1: distance away from the neutral axis) of the accelerometer / inclinometer using the cantilever structure.

According to the preferred embodiment of FIG. 4, one side and the other side of the optical fiber cable 40 in which the optical fiber sensor 45 is formed in a grid are attached and fixed on the surfaces of the fixing member 30 and the mass 20 through the fixing agent 50, respectively. However, the fixing surface is configured to be fixed on one side of the same direction of the fixing member 30 and the mass 20. In the " same direction one side ", in a plurality of surfaces of the fixing member 30 and the mass body 20 composed of a polyhedron, one side of the fixing member 30 and one side of the mass body 20 face the same direction. It refers to one side. In addition, the accelerometer / inclinometer of the present invention operates to detect the strain through the tension-compression of the optical oil sensor according to the bending operation of the cantilever 10, wherein the optical fiber cable 40 has the cantilever 10 bending operation. It is preferable to comprise so that it may be arrange | positioned and fixed to the upper area | region of the direction to make.

The fixing agent 50 may be fixed to both ends of the optical fiber cable 40 by applying to the fixing portion using a resin-based adhesive including an epoxy resin and then cured. When fixing the optical fiber cable 40 using the resin-based adhesive as described above, when the cantilever 10 is bent, the optical fiber cable 40 is slipped or detached from the fixing portion of the mass 20 and the fixing member 30. Apply to a thickness sufficient to prevent the to maintain a firmly fixed on the surface.

The optical fiber sensor 45 is a device for detecting a displacement of an object, and specifically refers to a fiber bragg grating (FBG) strain sensor. Briefly explaining the operation principle of the FBG strain sensor, by generating a Bragg grating reflecting a specific wavelength to the optical fiber cable 40, and using the property that the reflected wavelength is changed according to the tension-compression of the reflected wavelength changed from the initial wavelength The sensor operation is performed by calculating the amount of change. In the case of the accelerometer / inclinometer of the present invention, the tension-compression of the FBG strain sensor is generated by the bending operation of the cantilever according to the structure motion (for example, settlement, deformation, etc.), and the deformation and deformation of the structure can be detected by calculating and calculating the same. do.

The optical fiber cable 40 is a means for transmitting a data signal output from the optical fiber sensor 45 to the measuring device, the accelerometer / inclinometer according to a preferred embodiment of the present invention through a single optical fiber cable a plurality of optical fiber sensors ( 45 are configured to be spaced apart in series and connected in series.

The measuring device refers to a conventional computer device for analyzing the deformation degree of the structure by receiving data signals output from the optical fiber sensor 45, and specifically, to the optical fiber sensor 45 through the optical fiber cable 40. After irradiating the light, it is possible to grasp the displacement of the inclination to the acceleration by calculating the amount of change in the wavelength of the light reflected from the optical fiber sensor 45.

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 optical fiber sensor 45 according to the present invention.

In general, the measurement range of the FBG strain sensor is 0-10,000 με. Therefore, when fixing both ends of the optical fiber cable 40 by the fixing agent 50, in order to measure the compression, the pre-strain should be applied and fixed as much as the desired compressive strain. The strain can be measured.

If it is used as an accelerometer as shown in FIG. 7, it is assumed that the optical fiber sensor 45 is fixed to each of the bottom surfaces of the mass body 20 and the fixing member 30, and a prestress of 1,000 με is applied. The maximum range of becomes 1,000 με.

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 cantilever 10 is subjected to compression due to the increased weight, and if the influence thereof is assumed to be 600 με, the compressive strain applied to the optical fiber sensor 45 is 1,000-600 = 400 με, which is measurable in the compression direction. Is reduced to 400με. As described above, in order to re-adjust the measurement sensitivity through the addition and subtraction of the additional mass of the present invention, the amount of prestress should be artificially controlled.

In order to achieve this object, the accelerometer / inclinometer of the present invention forms an insertion groove 21 and a fastening hole 22 in the mass body 20, and the cantilever 10 extends in a plate shape wide at its end. The structure provided with the part 11 is comprised.

That is, the cantilever fastening portion 11 inserted into the mass insertion groove 21 is fixed by the pressing of the fastening hole 22 formed through the vertical upper portion thereof and the end of the fixing bolt 23 penetrating the fastening hole 22. Even if the optical fiber sensor 45 is fixed to the mass body 20, the fixing bolt after finely adjusting the position in the mass body insertion groove 21 of the cantilever fastening part 11 within the range of "K". By fixing to 23, it is possible to artificially adjust the amount of prestress applied to the optical fiber sensor 45 to set the optimum measurement sensitivity.

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 cantilever 10 is directly buried in the structure while the fixing member 30 is omitted, and the optical fiber cable 40 is also directly attached to the structure. Of course, the same effect can be realized.

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 cantilever bending part 20 mass
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 cantilever configured to bend deformation by an 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
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 method according to claim 1,
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 method of claim 2,
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 method according to claim 1,
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.
The method according to claim 1 or 4,
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.
KR1020100028767A 2010-03-30 2010-03-30 High sensitivity acceleration and inclination measurement device using optical fiber sensor KR20110109164A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
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

Cited By (8)

* Cited by examiner, † Cited by third party
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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