WO2003019113A1 - Dispositif de surveillance optique de securite de structure - Google Patents

Dispositif de surveillance optique de securite de structure Download PDF

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Publication number
WO2003019113A1
WO2003019113A1 PCT/KR2001/001467 KR0101467W WO03019113A1 WO 2003019113 A1 WO2003019113 A1 WO 2003019113A1 KR 0101467 W KR0101467 W KR 0101467W WO 03019113 A1 WO03019113 A1 WO 03019113A1
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WIPO (PCT)
Prior art keywords
light
target
monitoring system
receiving portion
light receiving
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Ceased
Application number
PCT/KR2001/001467
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English (en)
Inventor
Jin-Yi Lee
Moon-Phil Kang
Min-Soo Kim
Dae-Jung Kim
Won-Ha Choi
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Lacomm Co Ltd
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Lacomm Co Ltd
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Publication of WO2003019113A1 publication Critical patent/WO2003019113A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge

Definitions

  • the present invention relates to an optical structure safety monitoring system, and more particularly, to a system for optically monitoring a degree of inclination and vibration of a structure such as a building, bridge, tunnel, or steel tower by emitting a light beam from the outside of the structure to the structure so that safety of the structure is diagnosed in real time and anticipated danger is alarmed immediately.
  • the safety of a structure can be accurately diagnosed by a non-destructive testing (NDT), such as radiation transmission or supersonic wave test, in addition to a fundamental appearance test.
  • NDT non-destructive testing
  • the NDT is necessary for the diagnosis of safety of >a structure during construction thereof as well as at a regular or irregular time after construction.
  • the NDT is not appropriate for a regular monitoring system.
  • the NDT requires long-term preparation and diagnosis because it should be executed in a variety of manners according to features of structures and needs lots of experts in various fields.
  • an economical factor during operation should be taken into consideration for the regular monitoring system, the NDT needing manpower of a high quality and expensive equipments lacks the resolving factor.
  • 10-2000-0065832 discloses a detection sensor for monitoring internal cracks of a construction structure.
  • the detection sensor is buried in the structure by making an optical fiber cable penetrate a body made of the same material (concrete) as that of the structure.
  • the detection sensor is intended to make an error in an optical transmission function as being cut off or deformed when an internal crack occurs in the structure. That is, in the structure where the detection sensor is buried, by transmitting laser light into one end of the optical fiber cable and receiving the laser light emitted from the other end of the optical fiber cable, an internal crack of a structure can be monitored based on the presence of the laser light or a change in the quantity of light.
  • the monitoring by the detection sensor is limited. That is, regular monitoring is available only when the optical fiber cable is safely buried and well kept. If an error is generated in the buried optical fiber cable due to an internal crack in the structure, the detection sensor cannot be used again or repaired. When the buried optical fiber cable has a problem and does not work properly, the safety of the structure should be monitored or diagnosed in a different method thereafter. Also, the optical fiber cable is easily damaged during the steps of pouring and curing of concrete in the construction of a structure. Once the optical fiber cable is damaged, repair thereof is hardly possible. In addition, the optical fiber cable cannot be applied to existing structures and structures made of wood or steel frames, not concrete.
  • the present applicant has studied a way to optically monitor safety of a structure from the outside without burying an optical fiber cable in the structure. Based on the above studies, prior to the present invention, the present applicant has filed Korean Patent Application No. 10-1999-0061743 and Korean Utility Model Registration No. 185157 regarding a structure safety monitoring system and method using light which enables permanent monitoring, can be applied regardless of materials used for a structure, and enables accurate diagnosis and instant alarming for danger by analyzing a displacement of the structure in three dimensions.
  • a laser is used as a light emitting means and is fixed to a structure. A beam emitted from the laser is received at a stable place off from the structure. The received beam is converted to an electric signal. Information such as inclination or vibration of the structure included in the electric signal is analyzed so that the system gives an alarm for danger by diagnosing the safety of the structure.
  • the installation of a system and maintenance thereof should be efficient.
  • the laser since the laser is directly fixed to the structure, in some cases, access to a structure is difficult and installation, maintenance, and repair of the system are difficult and inconvenient.
  • the laser requires a stable power supply, in some structures, no electric equipment is provided so that an addition electric equipment needs to be constructed or such a construction is not available.
  • a smallest change such as inclination or vibration occurring in the structure can be sufficiently detected. That is, a high level optical resolving power is required and a sufficiently long optical path needs to be secured therefor.
  • a mobile monitoring system Since a laser apparatus is relatively expensive, considering an resolving point in operation, a mobile monitoring system has been suggested by reducing the number of lasers through an optimized installation and efficient management. Also, an apparatus such as a laser needs to be carried to a designated place for repair or check.
  • an object of the present invention to provide an optical structure safety monitoring system which can be easily installed and maintained, can further improve optical resolving power, and can be easily moved.
  • an optical structure safety monitoring system comprising a target attached to a structure to be monitored and reflecting light, a light emitting portion projecting light toward the target, a light receiving portion detecting an electric signal including displacement information of the structure from the light reflected by the target, and a monitoring means for monitoring a displacement of the structure based on the electric signal detected by the light receiving portion.
  • a total reflection mirror such as a typical mirror, or a polarized patterned mirror selectively reflecting light according to the direction of polarization can be used as the target.
  • a goniometer which can adjust an angel by 0.1 ° is used as the means for adjusting an incident angle.
  • a laser is preferably used as the light emitting portion and a means for adjusting the diameter of a laser beam is added according to the light receiving method.
  • a means for adjusting the diameter of a laser beam is added according to the light receiving method.
  • two photoelectric sensors an array in which the photoelectric sensors are arrayed in two dimensions, a CCD camera, and two CCD linear camera are used.
  • a computer system having a predetermined program is sued to process the detected signal from the light receiving portion and diagnose the safety of the structure.
  • computer systems for monitoring are installed at a site where the structure is located and a central management office at a remote place so that a plurality of structures located in different places can be integrally monitored and alarmed through networking.
  • FIG. 1A is a profile showing a change in an optical track due to inclination of a structure to explain the principle of an optical structure safely monitoring system according to the present invention
  • FIG. 1 B is a profile showing a change in an optical track due to vibration of a structure to explain the principle of an optical structure safely monitoring system according to the present invention
  • FIG. 2 is a view showing an optical structure safety monitoring system according to a first preferred embodiment of the present invention, in which a reflection mirror is attached to a structure and a two-dimensional photoelectric sensor array is arranged at a light receiving portion;
  • FIG. 3A is a perspective view showing an example of installing a reflection mirror of FIG. 2 in which an angle can be adjusted by using a goniometer
  • FIG. 3B is a perspective view showing an example of installing a reflection mirror of FIG. 2 in which an angle can be adjusted by using a goniometer and displacement of a structure can be amplified;
  • FIG. 4 is a flow chart showing a data process of a local monitoring system of FIG. 2;
  • FIG. 5 is a flow chart showing a data process of a remote monitoring system of FIG. 2;
  • FIG. 6 is a view showing an optical structure safety monitoring system according to a second preferred embodiment of the present invention, in which a total reflection mirror is attached to a structure and two CCD cameras are arranged at a light receiving portion;
  • FIG. 7 is a view showing an optical structure safety monitoring system according to a third preferred embodiment of the present invention, in which a total reflection mirror is attached to a structure and a CCD linear camera is arranged at a light receiving portion;
  • FIG. 8 is a view showing an optical structure safety monitoring system according to a fourth preferred embodiment of the present invention, in which a specially manufactured polarized patterned mirror is attached to a structure and a two-dimensional photoelectric sensor array is arranged at a light receiving portion;
  • FIG. 9 is a view showing an optical structure safety monitoring system according to a fifth preferred embodiment of the present invention, in which a specially manufactured polarized patterned mirror is attached to a structure and a spectroscope for splitting polarizing light only in a particular direction and two photoelectric sensors are arranged at a light receiving portion;
  • FIG. 10 is a view showing a pattern of the polarized patterned mirrors used in the fourth and fifth preferred embodiments.
  • FIG. 11A is a view showing a pattern obtained by observing a polarized patterned mirror used in the fourth and fifth preferred embodiments by a vertical polarizing spectroscope;
  • FIG. 11 B is a view showing a pattern obtained by observing a polarized patterned mirror used in the fourth and fifth preferred embodiments by a horizontal polarizing spectroscope
  • FIG. 12A is a graph showing a change in a detection signal corresponding to a vertical polarization component of a beam track shown in FIGS. 10 and 11 A;
  • FIG. 12B is a graph showing a change in a detection signal corresponding to a horizontal polarization component of a beam track shown in FIGS. 10 and 11 B.
  • reference 1 denotes a major portion of a structure, for example, a column or beam of a building, a pier or upper deck of a bridge, or a wall surface of tunnel to be monitored.
  • a target for example, a total reflection mirror 2, for reflecting a light beam is attached at a target position of the structure 1 to be monitored.
  • An optical system is provided which includes a light emitting portion for projecting an incident beam 3 to the total reflection mirror 2 and a light receiving portion for detecting an electric signal by receiving reflected beams 4, 4a, and 4b.
  • An information processing step is performed in which vibration of a structure is analyzed based on the electric signal detected by the light receiving portion of the optical system. If a change is determined to be dangerous in the above step, alarm is operated to notify the same to a manager so that the safety of a structure can be regularly monitored.
  • a displacement of a structure can be divided into a rotational vibration rotating with respect to each axis and/or an axial vibration moving along the respective axial directions.
  • inclinations with respect to the respective axes are ⁇ , ⁇ , and ⁇ and displacements of the respective axial directions according to the axial vibration are ⁇ x, ⁇ y, and ⁇ z.
  • FIG. 1A shows a change in an optical track due to an inclination ⁇ with respect to the x axis of the structure 1.
  • an incident angle and reflection angle ⁇ is defined as follows.
  • the inclination ⁇ can be expressed as follows.
  • ⁇ 7 / ⁇ tan((9 + 2 )-tan0 ⁇
  • ⁇ Y is a vertical displacement of the reflection beam 4a moved on the X-Y plane due to ⁇ .
  • FIG. 1 B shows a change in an optical track of the reflected beam 4b when the structure 1 moves in a direction along the z axis.
  • the relationship of a vertical displacement ⁇ Y' by ⁇ z can be expressed as follows.
  • a CCD camera having a resolving power of 10 ⁇ m can be used instead of the photoelectric array.
  • Equation 5 As a result, quantitative analysis of ⁇ , ⁇ , and ⁇ z is possible by using Equation 5.
  • an optical structure safety monitoring apparatus includes a total reflection mirror 2 attached to the structure 1 as a target and a light emitting portion 6 and a light receiving portion 20.
  • An electric power portion 10 for supplying electric power to the respective parts, and an analog to digital converter 11 , a local monitoring system 12, and a first alarm 13, as a monitoring means, are installed at the site.
  • the local monitoring system 12 is connected to a remote monitoring system 15 and a second alarm 16 at a remote place such as a central management center by using a communication network 14 such as a wireless optical communication, a dedicated line, or LAN.
  • the remote monitoring system 15 may form a single network with the local monitoring systems 12 installed at a plurality of sites.
  • Each local monitoring system 12 may be connected to a plurality of optical systems installed at a plurality of target positions in a single structure.
  • the total reflection mirror 2 that is a target can be replaced by a polarized patterned mirror to be described later.
  • a goniometer capable of adjusting an angle at an accuracy of 0.1° can be attached at the structure 1 in two methods, as shown in FIGS. 3A and 3B.
  • two goniometers 30 and 30' are used to adjust incident angles in two directions with respect to the x axis and the y axis.
  • the two goniometers 30 and 30' include main bodies 31 and 31 ' and mobile bodies 32 and 32' and adjustment screws 33 and 33' are installed at the main bodies 31 and 31 '.
  • the main body 31 of one goniometer 30 is coupled to the structure 1 buy bolts.
  • the main body 31' of the other goniometer 30' is disposed perpendicularly on the mobile body 32 of the one goniometer 30 by being coupled thereto using bolts.
  • the total reflection mirror 2 is directly, or supported by an additional spring 34, attached to the mobile body 31' of the other goniometer 30'.
  • the main bodies 31 and 31 ' and the mobile bodies 32 and 32' of the goniometers 30 and 30' are graduated to read a fine angle (here, a unit of an angle is omitted). By checking graduations and moving the mobile bodies 32 and 32' using the adjustment screws 33 and 33', the inclination of the total reflection mirror 2, that is, the incident angle ⁇ , can be adjusted to a desired angle.
  • FIG. 3B shows that vibration of the total reflection mirror 2 is amplified b using an elasticity of the spring 34 with respect to vibrations of the structure 1.
  • a response feature is superior due to an amplification effect with respect to fine vibrations of the structure 1.
  • this method is useful when a high frequency vibration is measured in a test room or a qualitative analysis at the site is needed.
  • the light emitting portion 6 includes a
  • He-Ne laser which continuously oscillating a beam having a wavelength of 635 nm, a rated output power of 17 mW, and a diameter of 1 mm.
  • a beam expander 7 and a pinhole 8 for space filtering are installed on the He-Ne laser.
  • the He-Ne laser is formed to emit a laser beam having a diameter of 10 mm corresponding to the size of a photoelectric sensor of the light receiving portion to be described later.
  • a total of 100 photoelectric sensors, each having a size of 10 mm x 10 mm, are arrayed 10 by 10 along the x and y axes in the two-dimensional photoelectric sensor array 22 of the light receiving portion 20 and an optical filter 23 is attached thereon.
  • the diameter of a laser beam is less than 10 mm, a small inclination or vibration caused by a beam moving within an area of one photoelectric sensor forming the photoelectric sensor array 22 may not be monitored. If the diameter of a beam is greater than 10 mm, the beam is incident on neighboring 2 or 3 photoelectric sensors at the same time. Such a problem can be easily solved by comparing detection signals of the respective photoelectric sensors according to the Gaussian distribution of a laser beam spot using data process algorithm of a monitoring system to be described later and calculating the maximum value.
  • An uninterruptible power supply (UPS) using a commercial AC voltage AC110/220V is used as the electric power portion 10 so that power can be stably supplied even for blackouts, thus preventing interruption of the operation of an optical system and monitoring system.
  • the analog to digital converter 11 has 100 channels to parallel process an analog value of a signal detected from the respective photoelectric sensor device arranged on the two-dimensional photoelectric sensor array 22 of the light receiving portion 20 to digital data.
  • Each of the local monitoring system 12 and the remote monitoring system 15 includes a personal computer having an interface card installed for data compatibility and applications programs for performing the processing as shown in FIGS. 4 and 5.
  • the local monitoring system 12 preferably performs only a simple calculation processing with respect to the displacements ⁇ X and ⁇ Y of a beam received based on the detection signal of the respective photoelectric sensor devices while a detailed analysis work about inclination and vibration of a structure and management of a large scale of database are performed by the remote monitoring system 15.
  • the beam emitted from the laser of the light emitting portion 6 is reflected by the total reflection mirror 2.
  • Some (about 50%) of the amount of light is reflected by the beam splitter 21 and arrives at the two-dimensional photoelectric array 22, and electric signal is detected by the two-dimensional photoelectric array 22.
  • the detected electric signal includes information indicating a degree of inclination or vibration of a structure corresponding to the positions of the respective photoelectric sensor devices arranged in the two-dimensional photoelectric sensor array 22.
  • (S41) the two-dimensional photoelectric sensor array 22 of the light receiving portion in a trigger method to receive data through the analog-to-digital converter 11.
  • S42 determines whether the data is normally received
  • S43 the data is temporarily stored in a memory (S43). If the data is not input at all or determined to be abnormal, it can be through that the optical system does not work properly or the structure is inclined or vibrated greatly, which is very dangerous.
  • the first alarm 13 is operated (S47) to have a manger check the situation and take action and then the information is stored (S48).
  • the stored data is read by a calculation apparatus in the system and the maximum light amount value of each of the photoelectric sensor devices in the two-dimensional sensor arrays 22 is extracted to calculate the displacements ⁇ X and ⁇ Y.
  • visualized graphic display information by graphically processing the displacements is output to a monitor connected to the system.
  • the manager can monitor in real time the present state of the structure through the monitor displaying graph information.
  • the processed displacement and graphic display information are stored (S45) and the displacement is compared with a set value to determine whether it is dangerous (S46).
  • the first alarm 16 is operated (S47) and alarm information is stored (S48).
  • Calculation result data including the stored input data and the graphic display information and alarm information are transmitted to the central monitoring system 15 at a remote place through the communications network 14.
  • the remote monitoring system 15 collects information from the local monitoring system 15 provided at each site in a one-directional or bi-directional communications method to establish database (S52).
  • the remote monitoring system 15 opens the established database to accurately analyze inclination and vibration ( ⁇ , ⁇ , and ⁇ z) of a structure based on Equation 5.
  • ⁇ , ⁇ , and ⁇ z inclination and vibration
  • S53 After the first alarm information is analyzed (S53), it is determined from the result of the analysis whether the displacement of a structure is in a dangerous level (S54). If it is determined to be in a dangerous level, the manager is immediately notified of such information via the second alarm 16.
  • the second alarm operated by the remote monitoring system 15 is generated in the cases in which the first alarm is generated at a particular period so that a resonance phenomenon is expected, the first alarm continues so that plastic deformation of a structure is expected, or a malfunction or change is expected in an apparatus or structure from the accumulated database analysis result.
  • two CCD (charge coupled device) linear camera having a one-dimensional photographing deice are arranged at the light receiving portion 60, as shown in FIG. 6.
  • the light receiving portion 60 includes a first beam splitter 61 splitting a light beam reflected by the total reflection mirror 2 from an incident path of a laser beam, a second beam splitter 62 splitting the amount of the light split by the first beam splitter 61 in a ratio of 50:50 to be separated into two reflected beams paths, and translucent sheets 63 and 63', cylindrical lenses 64 and 64', reflection mirrors 65 and 65', and the CCD linear cameras 66 and 66' which are arranged on each of the two reflected beam paths.
  • Other configurations are the same as those of the preferred embodiment 1.
  • a digital interface board for example, Meteor2-DIG/4/L, 3CH of Matrox Inc., needs to be installed at the local monitoring system 12 for data input of the CCD linear camera.
  • An image of the reflected beam is projected onto the translucent sheets 63 and 63'.
  • Each of the cylindrical lenses 64 and 64' focuses an image in one direction of X axis or Y axis, and transmits in the other direction, to form an image.
  • Two CCD linear cameras 66 and 66' photograph an image of the reflected beam formed in any one direction and detect signals indicating information on displacements ( ⁇ X and ⁇ Y) of the reflected beam in each direction.
  • the inclination and vibration of a structure can be quantitatively estimated based on the data input from the two CCD linear cameras 66 and 66'.
  • the interval between pixels of a photographing device of the CCD linear camera is 14 ⁇ m, a resolving power having a high accuracy can be obtained. Also, since the number of pixels per camera is 512, a sufficient sampling speed can be obtained which is advantageous in detection of a high frequency vibration.
  • a light receiving portion 70 includes a beam splitter 71 , a translucent sheet 72, and a CCD camera 73.
  • the reflected beam of the total reflection mirror 2 is separated by the beam splitter 71 and projected onto the translucent sheet 72. Since the CCD camera 73 has a two-dimensional photographing device, data including information on the position of the image is detected by photographing the image of the reflected beam projected on the translucent sheet 72.
  • a photographing device of the CCD camera since the interval between pixels is 14 ⁇ m and the number of pixels is about 300,000, a space resolving power having a very high accuracy can be obtained.
  • the CCD camera is suitable for quantitatively measuring a lower frequency vibration.
  • the optical system including a lens can be simplified so that the structure becomes compact and economical and installation thereof is made easy.
  • a common total reflection mirror is used as a target attached to a structure and an inclination angle is applied to the beam so that only the displacements ⁇ , ⁇ , and ⁇ z of the displacements of a structure are monitored.
  • preferred embodiments in which not only the displacements ⁇ , ⁇ , and ⁇ z but also displacements ⁇ , ⁇ x, and ⁇ y can be detected will be described.
  • a polarized patterned mirror 5 having a special pattern is attached to the structure 1 instead of a total reflection mirror, and other structures are the same as those the preferred embodiment 1.
  • a light receiving portion 90 includes a first beam splitter 91 splitting a reflected beam of the polarized patterned mirror 5 from an incident path of a laser beam, a second beam splitter 92 for splitting the amount of light of the reflected beam split by the first beam splitter 91 into a ratio of 50:50 to be separated into two reflected beam paths, and vertical and horizontal polarizing spectroscopes 93 and 93', focusing lenses 94 and 94', and photoelectric sensors 95 and 95' arranged on the respective split optical paths of the reflected beams,
  • the polarized patterned mirror 5 in the above-described preferred embodiments 4 and 5 can be attached to a structure in two ways as shown in FIGS. 4A and 4B, by using the goniometer as in the case of the above-described total reflection mirror.
  • the pattern of the polarized patterned mirror 5, as shown in FIG. 10, has a vertical polarization pattern VP and a horizontal polarization pattern HP arranged at an interval of 1t, 2t, and 3t (t is a unit of length) so as to be horizontal and symmetrical with respect to the X axis and the Y axis, respectively.
  • the remaining area is processed to be a non reflection area.
  • the polarized patterned mirror 5 is divided into a non polarizing reflection area 5a where the vertical and horizontal polarization patterns VP and HP cross each other and light is reflected in all polarization directions, polarizing reflection areas 5b and 5c the vertical and horizontal polarization patterns VP and HP do not cross each other and light is reflected in the respective polarization directions, and a non reflection area 5d in the remaining area (please refer to FIGS. 11A and 11 B).
  • FIG. 11A shows the vertical polarization pattern VP on the polarized patterned mirror 5 observed through the vertical polarizing spectroscope 93 in the preferred embodiment 5.
  • FIG. 11 B shows the horizontal polarization pattern HP on the polarized patterned mirror 5 observed through the horizontal polarizing spectroscope 93' in the preferred embodiment 5.
  • These spectroscopes 93 and 93' have transmittances of 20% to the non polarizing reflection area 5a, 10% to each of the polarizing reflection areas 5b and 5c, and 0% to the non reflection area 5d.
  • a displacement ⁇ Y in the Y-axis direction is detected by the vertical polarizing spectroscope 93 and a displacement ⁇ X in the X-axis direction is detected by the horizontal polarizing spectroscope 93'.
  • the amount of light of a beam passing through each of the respective spectroscopes 93 and 93' regularly changes according to the pattern arrangement and the transmittance in each area along a movement path of the beam.
  • a signal whose amplitude is changing regularly according to the change of the amount of light is detected by the photoelectric sensors 95 and 95' so that inclination and vibration of a structure can be quantitatively analyzed based on the detected signal.
  • a beam is moved from the original position of P0(X0, Y0) to P2(X2, Y2) via P1 (X1 , Y1 ), due to inclination or vibration occurring in a structure in one direction.
  • the diameter of a laser beam input to the polarized patterned mirror 5 is less than the unit of length, t.
  • Part of the laser beam reflected by the polarized patterned mirror 5 is polarized. Changes of the signals detected by the photoelectric sensors 95 and 95' through the spectroscopes 93 and 93' are s shown in FIGS. 12A and 12B. That is, assuming that the initial amount of light of a beam incident on the polarized patterned mirror 5 is 1 , a value corresponding to the non polarizing reflection area 5a having a 20% transmittance, values corresponding to the polarizing reflection areas 5b and 5c having 10% transmittances, and a value corresponding to the non reflection area 5d, in the X and Y axes from the original point P0, have a ratio of 0.2, 0.1 , and 0.
  • the ratio therebetween remains unchanged in most cases.
  • the change in a signal value corresponding to the change in the amount of light is very regular. That is, the amount of light passing through the spectroscope change as in the sequence, [ 0 ⁇ O ⁇ 00 ⁇ O ⁇ 000 ⁇ O ⁇ 0 ⁇ O ⁇ 00 ⁇ O ⁇ 0001, corresponding to the movement path thereof from the center.
  • the polarized patterned mirror 5 is manufactured such that a pattern of signal values, [0 U 00 U 000 U], is repeated while moving in one direction with respect to the center P0.
  • the signal value pattern detected by the vertical polarizing spectroscope 93 is reversed from the 12 th signal which means the beam moves in the reverse direction after passing a peak of the 11 th signal.
  • the periodic signal value pattern is then repeated after the center of symmetry.
  • the displacements ⁇ X and ⁇ Y are quantitatively measure on the X and Y axes.
  • the inclination, ⁇ by the rotation with respect to the z axis, or the vibrations, ⁇ x and ⁇ y in the X axis and the Y axis, can be indicated.
  • the displacements ⁇ X and ⁇ Y are caused by deformation of a structure, that is, rotation and vibration in the axial directions and are congruous with the scale of ⁇ x and ⁇ y.
  • the pattern on the polarized patterned mirror 5 is symmetrical to each axis, it is difficult to determine whether the direction of a displacement is positive (+) or negative (-).
  • P the signal value pattern begins with [U 00]
  • the direction is positive (+)
  • the signal value pattern begins with [U 0] the direction is negative (-).
  • the direction can be recognized by measuring the displacement only in the 1/4 quadrant section of the polarized patterned mirror 5.
  • the polarized patterned mirror 5 and the two photoelectric sensors 95 and 95' only are used as in the preferred embodiment 5, it is difficult to determine whether the measured displacements, ⁇ X and ⁇ Y, are caused by the rotation with respect to the x axis and the y axis or the vibration in the z-axis direction.
  • Such a problem can be solved by arranging a two-dimensional photoelectric array or a CCD linear camera at the light receiving portion, or adopting a variety of different polarization pattern, as in the above-described preferred embodiments.
  • a target is attached at a target position of a structure to be monitored and a light beam is emitted to the target.
  • a light emitting portion and a light receiving portion to respectively project and detect a light beam to and from the target are installed at safe places remote from the structure.
  • resolving power for monitoring a fine vibration of a structure to be monitored is improved.
  • the safety of a structure can be monitored with a sufficient resolving power in a narrow space in the structure.
  • the light emitting portion and the light receiving portion of an optical system can be moved with respect to the target, a mobile monitoring is possible by attaching a target at many places on a structure and moving the optical system with respect to each target. That is, since the minimum number of an expensive equipment such as a laser is needed, the manufacturing costs can be reduced.

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Abstract

L'invention concerne un système de surveillance optique de sécurité de structure, qui comprend un système optique comportant une zone d'émission de lumière (6) et une zone de réception de lumière (20), et un miroir à réflexion totale fixé à une structure (1). Un système de surveillance local (12) et une première alarme (13) déterminent le déplacement d'un trajet optique établi suite à telle ou telle vibration de la structure, en fonction d'un signal décelé par la zone de réception de lumière du système optique, déclenchant une première alarme en cas de changement constaté. Un système de télésurveillance (15) et une seconde alarme (16) permettent de constituer une base de données à travers la collecte d'informations fournies par les communications avec le système de surveillance local, d'établir un diagnostic de sécurité concernant la structure en analysant l'inclinaison et la vibration de la structure à partir de la base de données, et de déclencher une seconde alarme en analysant la première alarme selon le résultat du diagnostic.
PCT/KR2001/001467 2001-08-28 2001-08-29 Dispositif de surveillance optique de securite de structure Ceased WO2003019113A1 (fr)

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KR1020010052103A KR20030018391A (ko) 2001-08-28 2001-08-28 광학식 구조물안전감시장치
KR2001/52103 2001-08-28

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20030018391A (ko) * 2001-08-28 2003-03-06 주식회사 레이콤 광학식 구조물안전감시장치
WO2007088042A1 (fr) * 2006-02-02 2007-08-09 Northrop Grumman Litef Gmbh PROCEDE DE detection DE SOLLICITATIONS SUR ET/OU DE DOMMAGES À UNE STRUCTURE MECANIQUE
DE102006045263A1 (de) * 2006-09-22 2008-03-27 Goecke Gmbh & Co. Kg. Vorrichtung und Verfahren zur permanenten Überwachung von Verformungen
US8788240B2 (en) 2010-12-22 2014-07-22 WISEN sp. zo. o. Monitoring method of vertical displacement and vertical deflection change of building construction elements, especially of the roof, and a system for realization of this method
WO2017031064A1 (fr) * 2015-08-14 2017-02-23 Intelligent Structures, Inc. Appareil et procédés permettant de surveiller le mouvement de structures physiques par déviation de laser
CN108386230A (zh) * 2018-04-20 2018-08-10 中国水利水电第十四工程局有限公司 一种用于监测隧道仰拱初期支护变形的报警装置
US10499037B1 (en) * 2015-05-28 2019-12-03 Amazon Technologies, Inc. Active alignment of stereo cameras
CN113250916A (zh) * 2021-06-29 2021-08-13 中国华能集团清洁能源技术研究院有限公司 一种基于光干涉的风机塔筒倾斜监测装置及方法
CN114485580A (zh) * 2020-10-27 2022-05-13 罗曦明 一种地下区域沉降和倾斜在线监测系统
CN115469573A (zh) * 2022-08-05 2022-12-13 杭州杰牌传动科技有限公司 一种用于装配式建筑的塔式起重机控制系统

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KR100584080B1 (ko) * 2006-03-06 2006-05-29 주식회사 삼보기술단 레이저를 이용한 교량의 실시간 안전진단장치 및 방법
KR100731275B1 (ko) * 2006-03-07 2007-06-21 주식회사 한랩 비반사면을 가지는 반사부를 이용한 구조물 진동레벨감지장치
KR100797942B1 (ko) * 2007-12-21 2008-01-24 주식회사 진화기술공사 광섬유를 이용한 교량의 말뚝 안전 점검장치
KR102125902B1 (ko) * 2020-01-16 2020-06-23 주식회사 우경일렉텍 수배전반의 조합된 감지신호를 이용한 사고 관리시스템

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KR20030018391A (ko) * 2001-08-28 2003-03-06 주식회사 레이콤 광학식 구조물안전감시장치
WO2007088042A1 (fr) * 2006-02-02 2007-08-09 Northrop Grumman Litef Gmbh PROCEDE DE detection DE SOLLICITATIONS SUR ET/OU DE DOMMAGES À UNE STRUCTURE MECANIQUE
JP2009525418A (ja) * 2006-02-02 2009-07-09 ノースロップ グルマン リテフ ゲーエムベーハー 機械的構造物における負荷／損傷を特定する方法
US8830477B2 (en) 2006-02-02 2014-09-09 Northrop Grumman Litef Gmbh Method for determining loads on a mechanical structure and the resultant damage
DE102006045263A1 (de) * 2006-09-22 2008-03-27 Goecke Gmbh & Co. Kg. Vorrichtung und Verfahren zur permanenten Überwachung von Verformungen
US8788240B2 (en) 2010-12-22 2014-07-22 WISEN sp. zo. o. Monitoring method of vertical displacement and vertical deflection change of building construction elements, especially of the roof, and a system for realization of this method
US10499037B1 (en) * 2015-05-28 2019-12-03 Amazon Technologies, Inc. Active alignment of stereo cameras
WO2017031064A1 (fr) * 2015-08-14 2017-02-23 Intelligent Structures, Inc. Appareil et procédés permettant de surveiller le mouvement de structures physiques par déviation de laser
US10627219B2 (en) 2015-08-14 2020-04-21 Intelligent Structures, Inc. Apparatus and methods for monitoring movement of physical structures by laser deflection
CN108386230A (zh) * 2018-04-20 2018-08-10 中国水利水电第十四工程局有限公司 一种用于监测隧道仰拱初期支护变形的报警装置
CN114485580A (zh) * 2020-10-27 2022-05-13 罗曦明 一种地下区域沉降和倾斜在线监测系统
CN113250916A (zh) * 2021-06-29 2021-08-13 中国华能集团清洁能源技术研究院有限公司 一种基于光干涉的风机塔筒倾斜监测装置及方法
CN113250916B (zh) * 2021-06-29 2022-08-30 中国华能集团清洁能源技术研究院有限公司 一种基于光干涉的风机塔筒倾斜监测装置及方法
CN115469573A (zh) * 2022-08-05 2022-12-13 杭州杰牌传动科技有限公司 一种用于装配式建筑的塔式起重机控制系统

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