KR102178291B1 - optical fiber sensor for safety diagnosis of facility - Google Patents

Abstract

The present invention relates to an optical fiber sensor for facility safety diagnosis, wherein a disk obliquely coupled to a rotating shaft rotatably extended in a unit housing, a weight having one end coupled to the rotating shaft, and a change in bending due to interference with the rotation of the disk A unit detection unit having a cantilever installed as possible, and a first optical fiber grating coupled to cause expansion and contraction corresponding to the bending deformation of the cantilever, and a unit housing from the light that is reflected and reflected by the first optical fiber grating And a diagnostic processing unit that calculates safety diagnosis information including at least one or more of vibration applied to the installed facility and slope of the facility. According to such an optical fiber sensor for safety diagnosis of a facility, it is possible to increase the detection sensitivity of vibration or tilt change information applied to a facility.

Description

Optical fiber sensor for safety diagnosis of facility

The present invention relates to an optical fiber sensor for facility safety diagnosis, and more particularly, to an optical fiber sensor for facility safety diagnosis capable of measuring and providing information related to structural safety of a facility.

Facilities, for example, large buildings formed by architecture are generally inspected for continuous safety through thorough supervision from design to completion and regular safety checks after completion.

These facilities are always in danger of causing a major catastrophe due to rapid collapse due to various internal and external causes during use. Therefore, in order to prevent the collapse of facilities and major catastrophes, there is always a monitoring and alarm system that can promptly take measures such as evacuation or suspension of use, etc., as soon as displacement, failure, or abnormality is discovered. It needs to be equipped.

As a general safety diagnosis method for such facilities, in addition to the most basic visual inspection, there are non-destructive tests such as radiation transmission and ultrasonic flaw detection, and the safety of the structure can be accurately diagnosed through these non-destructive tests. However, the non-destructive inspection is essential for the safety diagnosis during the construction process of the facility and regularly or irregularly after construction, but is not suitable as a regular monitoring means. In addition, non-destructive testing must be performed in a wide variety according to the characteristics of facilities, and must be performed by experts in each field, and there is a problem that it takes a lot of time to prepare and diagnose for the test.

As an alternative to this problem, a sensor for detecting internal cracks of a building structure using an optical fiber capable of monitoring the safety of facilities at all times is disclosed in Korean Patent Application Publication No. 10-2000-0065831. However, the detection sensor is a method of embedding the optical fiber inside the concrete, and if the optical fiber is cut by a crack, it cannot be reused or recovered, and thus its use is limited temporarily. In addition, there is a problem that is difficult to additionally apply to existing facilities already built.

The present invention has been invented to improve the above problems, and provides an optical fiber sensor for facility safety diagnosis that is easy to install on a facility, while increasing measurement sensitivity for changes in vibration and inclination applied to the facility, and capable of constantly monitoring. There is a purpose.

In order to achieve the above object, the optical fiber sensor for safety diagnosis of a facility according to the present invention includes a disk that is obliquely coupled at an angle out of a right angle with respect to a rotation axis rotatably extended in a unit housing, and the rotation axis is rotatable around a rotation center. One side is supported by a weight having one end coupled to the rotation shaft, and a supporter installed to be supported on the unit housing, and the other side interferes with the rotation of the disk to allow a change in bending, and a cantilever corresponding to the bending deformation of the cantilever A unit detection unit having a first optical fiber lattice coupled to one side of the cantilever along a longitudinal direction such that elastic deformation occurs; Safety including at least one of a vibration applied to a facility equipped with the unit housing from the light that is emitted to the first optical fiber grating of the unit detection unit and received by being reflected from the first fiber grating and the tilt of the facility And a diagnostic processing unit for calculating diagnostic information.

According to an aspect of the present invention, the diagnostic processing unit includes a light source; Receives the light emitted from the light source and transmits it to an optical transmission line leading to the first optical fiber grid through a first output terminal, and outputs light reflected from the first optical fiber grid and received from the optical transmission line through a second output terminal. An optical circulator; A light detection unit for detecting light output through the second output terminal of the optical circulator; And a diagnostic processing unit that calculates the safety diagnosis information from the light detected by the light detection unit.

Preferably, a second optical fiber grating coupled to the other side of the cantilever and connected in series with the first optical fiber grating; further comprising, the first optical fiber grating and the second optical fiber grating have different grating spacings from each other.

In addition, the unit detection unit further includes a spring coupled between the weight and the unit housing so as to extend along a direction orthogonal to an extension direction of the rotation shaft.

In addition, the cantilever is in an equilibrium state so that interference with the disc can be maintained even when the rotation shaft rotates in a forward direction and in a reverse direction within a set measurement range in an equilibrium state set for the unit housing. It is installed so that the interference against bending is maintained.

More preferably, the unit detection unit is mounted so that the direction of the rotation shaft is mutually orthogonal to each other so that the unit housing is accommodated in the main housing so that the three unit detection units can detect movement in three directions that are mutually orthogonal, and the diagnostic processing The unit transmits safety diagnosis information including at least one of a vibration applied to a facility equipped with the main housing and a tilt of the facility from the light reflected and received from the first optical fiber grating of each of the unit detection units in three directions. Is built to yield about.

According to the optical fiber sensor for safety diagnosis of a facility according to the present invention, it is possible to increase the detection sensitivity of vibration or tilt change information applied to a facility.

1 is a perspective view showing an optical fiber sensor for safety diagnosis of a facility according to the present invention,
2 is a view showing the control system of the optical fiber sensor for safety diagnosis of the facility of FIG. 1,
3 is a view showing an optical fiber sensor for safety diagnosis of a facility according to another embodiment of the present invention,
4 is a view showing a control system according to the first embodiment of the optical fiber sensor for safety diagnosis of the facility of FIG. 3,
5 is a view showing a control system according to a second embodiment of the optical fiber sensor for safety diagnosis of a facility of FIG. 3.

Hereinafter, an optical fiber sensor for safety diagnosis of a facility according to a preferred embodiment of the present invention will be described in more detail with reference to the accompanying drawings.

1 is a perspective view showing an optical fiber sensor for facility safety diagnosis according to the present invention, and FIG. 2 is a view showing a control system of the fiber optic sensor for facility safety diagnosis of FIG. 1.

Referring to FIGS. 1 and 2, an optical fiber sensor 100 for safety diagnosis of a facility according to the present invention includes a unit detection unit 110 and a diagnosis processing unit 200.

The unit detection unit 110 is configured to detect at least one or more of an inclination of a facility in one direction and an applied vibration.

The unit detection unit 110 includes a unit housing 120, a rotation shaft 131, a disk 133, a weight 135, a spring 139, a cantilever 141, the first and second optical fiber grids 151, ( 152).

The unit housing 120 is formed in the shape of a rectangular enclosure having an accommodation space 122 therein, and is either directly attached to a facility to be installed or mounted in a main housing (see FIG. 3; 101) to be described later to be fixedly installed on the facility. I can.

The rotation shaft 131 is supported by the bearing 131a in one direction in the accommodation space 122 of the unit housing 120 and extends rotatably.

The disk 133 is integrally coupled to the rotation shaft 131 so that the rotation shaft 131 passes through the center. The disk 133 is coupled to be inclined with respect to the rotation shaft 131 with respect to the rotation shaft 131 at an angle out of a right angle. In FIG. 2, an angle (a) between the front surface 133a of the disk 133 and the rotation shaft 131 at a position where the front surface 133a of the disk 133 is not visible from the side with respect to the rotation shaft 131 is 110 to 150 It is desirable to apply it to the degree.

One end of the weight 135 is coupled to the rotation shaft 131 so that the rotation shaft 131 is rotatable about a rotation center. The weight 135 is coupled to the end of the connection bar 136 extending downwardly orthogonal to the extending direction of the rotation shaft 131 from one end of the rotation shaft 131.

Reference numeral 138 is disposed to be spaced apart from each other on the left and right sides of the weight 135 in an equilibrium state to limit the rotation range of the weight 135 and is installed to be supported by the unit housing 120. Here, the equilibrium state refers to a state when no external force other than gravity is applied.

The spring 139 is coupled to extend in a direction orthogonal to the extension direction of the rotation shaft 131 between the weight 135 and the unit housing 120 to apply a restoring force to the weight 135. Unlike the illustrated example, when the unit housing 120 is disposed such that the rotation shaft 131 extends vertically, the spring 139 also functions to hang the weight 135.

One side of the cantilever 141 is supported by a supporter 145 installed to be supported on the unit housing 120, and the other side extending downward is installed to allow a change in bending while maintaining interference even when the disk 133 rotates. . The cantilever 141 may be formed of a thin metal plate capable of bending and having a restoring force. In addition, the cantilever 141 is a disc even when the rotation shaft 131 rotates in a forward direction, for example, clockwise in FIG. The cantilever 151 is installed to maintain the bending interference even in the equilibrium state so that interference with 133 can be maintained. As an example, a bending displacement of about 1/2 of the total bending displacement to be applied to the other end of the cantilever 151 in contact with the disk 133 may be constructed such that it is in contact with the disk 133 in an equilibrium state. have.

The first optical fiber grid 151 maintains contact with the disk 133 of the cantilever 151 so that expansion and contraction deformation occurs corresponding to the bending deformation of the cantilever 141, and the degree of bending is changed by the rotation of the disk 133. It is joined along the longitudinal direction on one side.

The second optical fiber grid 152 is coupled to the opposite side, that is, the other side of the cantilever 141, and is connected to the first optical fiber grid 151 in series. In this case, the expansion and contraction of the first optical fiber grating 151 and the second optical fiber grating 152 are mutually opposite to the bending deformation of the cantilever 141.

Here, it is preferable that the first optical fiber grid 151 and the second optical fiber grid 152 have different central wavelengths in a state in which no external force is applied. That is, the grid spacing of the first optical fiber grid 151 and the grid spacing of the second optical fiber grid 152 are formed differently from each other. In the illustrated drawing, the optical transmission lines 153 are marked on the cantilever 141 so that the first and second optical fiber gratings 151 and 152 are schematically recognized to be distinguished from the optical fiber, which is the optical transmission line 153. The portions where the first and second optical fiber grids 151 and 152 are formed are closely adhered so as to be interlocked and deformed by bending of the cantilever 141.

The diagnostic processing unit 200 emits light to the first and second optical fiber gratings 151 and 152 of the unit detection unit 110, and is reflected and received from the first and second optical fiber gratings 151 and 152. Safety diagnosis information including at least one or more of vibration applied to the facility in which the unit housing 120 is mounted or the inclination of the facility is calculated from the generated light.

The diagnosis processing unit 200 includes a light source 210, a light circulator 220, a light detection unit 230, a diagnosis processing unit 240, and a communication unit 250.

The light source 210 applies a broadband light source that emits light in a wide wavelength range.

The optical circulator 120 receives light emitted from the light source 210 through the input terminal 221 and transmits light from the first optical fiber grating 151 to the second optical fiber grating 152 through the first output terminal 222 The light is transmitted to the line 153 and reflected from the first and second optical fiber grids 151 and 152, and the received light is output through the second output terminal 223.

The photodetector 230 detects light output through the second output terminal 223 of the optical circulator 220 and provides it to the diagnosis processing unit 240.

The diagnostic processing unit 240 detects movement of the center wavelength due to the change in the grating spacing of the first optical fiber grating 151 and the second optical fiber grating 152 from the light detected by the light detection unit 230, from which the unit housing ( 120) Calculate slope or vibration information corresponding to safety diagnosis information of installed facilities.

The communication unit 250 is controlled by the diagnosis processing unit 240 and transmits the safety diagnosis information calculated by the diagnosis processing unit 240 to the communication address of the safety management server 270 set through the communication network 260.

The communication unit 250 may be applied with a wireless communication unit that transmits wirelessly, and the communication network 260 may be applied with wired or wireless Internet.

On the other hand, when the facility is inclined and the disk 133 is rotated counterclockwise in the state of FIG. 1, the first optical fiber grating 151 is reflected as the grating gap is further narrowed on one side where the bending of the cantilever 141 is further increased. The field shifts from the first reference center wavelength (λ1) to the direction in which the wavelength becomes shorter. In contrast, in the second optical fiber grating 152, as the grating gap is wider on the other side of the cantilever 141 to be relaxed, the reflected wavelength moves from the second reference center wavelength λ2 in a direction in which the wavelength increases.

Here, the first reference center wavelength λ1 is a wavelength reflected from the first optical fiber grating 151 with respect to the bending of the cantilever 141 based on the equilibrium state, and the second reference center wavelength λ2 is based on the parallel state. This is a wavelength reflected from the second optical fiber grid 152 with respect to the bending of the cantilever 141.

Therefore, the diagnostic processing unit 240 can check the movement amount of the center wavelength, calculate the rotation direction and rotation amount of the rotation shaft 141 from this, and calculate the tilt information and vibration information from the calculated rotation direction and rotation amount. have. Here, the amount of rotation corresponding to the movement of the center wavelength is previously recorded in the diagnosis processing unit 240.

Likewise, when the facility is inclined and the disk 133 is rotated clockwise in the state of FIG. 1, the first optical fiber grid 151 has a wider grid spacing on one side where the bending of the cantilever 141 is reduced, and the reflected wavelength is The center wavelength shifts from the first reference center wavelength (λ1) to the direction in which the wavelength increases, and the second optical fiber grid 152 is further narrowed on the other side of the cantilever 141 to be relaxed, and the reflected wavelength becomes the second reference. The center wavelength moves from the center wavelength (λ2) to the direction in which the wavelength becomes shorter.

When the center wavelength movement information of the first and second optical fiber grids 161 and 162 is used, the diagnosis processing unit 240 may calculate the previously described inclination and vibration information.

In addition, when the rotation shaft 131 is not rotated and only the temperature is changed, the light reflected from the first and second optical fiber gratings 151 and 152 is in the same direction by the same amount of wavelength fluctuation at the reference center wavelength (λ1) (λ2). That is, since the wavelength moves in the direction in which the wavelength increases or the wavelength decreases, it is possible to determine whether the wavelength is shifted due to a temperature change, thereby improving measurement accuracy.

On the other hand, unlike the illustrated example, if it is constructed to calculate safety diagnosis information in an environment with little temperature change, even if only one first optical fiber grid 151 is installed, the rotation shaft 131 rotates using the wavelength movement information described above. It goes without saying that it can be constructed to calculate safety diagnosis information by grasping whether it has been done.

In addition, when constructing to detect tilt and vibration application information in three directions that are mutually orthogonal to the facility, three unit detection units 110 are accommodated and fixed in the main housing 101 as shown in FIG. Just place it. In this case, the unit housing 120 may be mounted to be accommodated in the main housing 101 such that the directions of the rotation shaft 131 are mutually orthogonal to detect movement in three directions that are mutually orthogonal.

In this case, as shown in FIG. 4, the light source 210, the light circulator 220, and the light detection unit 230 may be applied to correspond to each unit detection unit 110 to be provided to the diagnostic processing unit 240. have. Here, for the first and second optical fiber grids applied to the unit detection unit 110, alphabetic subscripts a to c are assigned to be distinguished from each other. In addition, the first and second optical fiber grids 151a to 152c may all have different grid spacings.

Unlike this, as shown in FIG. 5, the optical fiber grids applied to each unit detection unit 110 are interconnected in series, and one light source 210, one optical circulator 220, and one optical detection unit By applying 230, it can be rescued to be provided to the diagnosis processing unit 240. Here, reference numeral 150a is an optical fiber grating group applied to the first unit detection unit 110 among the three unit detection units 110, and 150b is a serial connection to the first unit detection unit among the three unit detection units 110. Is an optical fiber grid group applied to the second unit detection unit 110, and 150c is an optical fiber grid group applied to the third unit detection unit 110 serially connected to the second unit detection unit among the three unit detection units 110. to be.

In this case, the diagnostic processing unit 240 is one of the vibrations applied to the facility equipped with the main housing 10 from the light reflected from the optical fiber gratings 151a to 152c of each of the three unit detection units 110 or the inclination of the facility. At least one safety diagnosis information may be calculated and provided for three directions.

According to the optical fiber sensor for safety diagnosis of a facility described above, it is possible to increase the detection sensitivity of vibration or tilt change information applied to a facility.

110: unit detection unit 120: unit housing
131: rotation shaft 133: disk
135: weight 139: spring
141: cantilever
151, 152: first and second optical fiber grids
200: diagnostic processing unit

Claims (6)

delete delete delete A disk that is obliquely coupled to a rotation shaft that is rotatably extended in the unit housing at an angle out of a right angle, a weight having one end coupled to the rotation shaft so as to be rotatable around the rotation center of the rotation shaft, and a supporter installed to be supported by the unit housing A cantilever that is supported on one side and the other side interferes with the rotation of the disk to allow a change in bending, and a first coupled to one side of the cantilever along the length direction to generate an elastic deformation corresponding to the bending deformation of the cantilever. A unit detection unit having one optical fiber grid;
Safety including at least one of a vibration applied to a facility equipped with the unit housing from the light that is emitted to the first optical fiber grating of the unit detection unit and received by being reflected from the first fiber grating and the tilt of the facility And a diagnostic processing unit for calculating diagnostic information,
The unit detection unit is
And a spring coupled between the weight and the unit housing so as to extend along a direction orthogonal to an extension direction of the rotation shaft. delete The method of claim 4, wherein the unit detection unit is mounted so that the unit housing is accommodated in the main housing so that the directions of the rotation shafts are mutually orthogonal so that the three unit detection units can detect movement in three directions that are orthogonal to each other. The diagnosis processing unit includes three safety diagnosis information including at least one of a vibration applied to a facility equipped with the main housing and a tilt of the facility from the light reflected and received from the first optical fiber grid of each of the unit detection units. Optical fiber sensor for facility safety diagnosis, characterized in that calculated for the direction.

Images