JP2013250189A - Inclination variation monitoring system and inclination variation monitoring method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inclination variation monitoring system capable of obtaining quantitative information indicating an inclination quantity and an inclination direction in a certain area and capable of time-sequentially monitoring the information.SOLUTION: The inclination variation monitoring system includes: a bubble tube; an inclination measuring instrument having imaging means for picking up an image of the bubble tube in each fixed time; and an analyzer communicably connected to the inclination measuring instrument. The inclination measuring instrument includes transmission means for transmitting image data on a bubble image to the analyzer in each fixed time. The analyzer includes: receiving means for receiving the image data in each fixed time; coordinate calculation means for calculating center coordinates of a bubble in the image data; inclination angle calculation means for calculating an inclination angle of the bubble tube from the coordinates of the bubble; angle difference calculation means for calculating a difference between the inclination angle of the bubble tube and an inclination angle of the bubble tube after fixed time; and discrimination means for discriminating whether or not the difference of the inclination angles is a preset inclination angle difference threshold or more.

Description

  The present invention relates to an inclination change monitoring system capable of appropriately monitoring an inclination of the ground or the like.

  The long slopes of highways, ordinary roads, railways, etc., and the slopes of steep slopes are monitored and managed by visually checking the slope. Slopes, steep slopes, etc. are also places where landslides or landslide disasters are likely to occur due to rain, snow, or the like.

  With regard to such land, obtain information on the initial deformation of the slope before the slope collapse (change in the data of the bubble sensor) from the field of disaster prevention, appropriately monitor the situation of the ground, etc., and manage and maintain it safely In some cases, however, a tilt change monitoring system that issues an alarm is strongly desired.

  In general, in order to measure the inclination, a bubble tube equipped with a bubble sensor that detects a bubble and the bubble is used. As shown in Patent Document 1, the bubble sensor, as a vertical determination sensor, detects the position of bubbles in the bubble tube and detects and determines the level of horizontal and inclination. As a method for detecting a bubble position using this bubble sensor, an optical device that irradiates light from a light source of, for example, an infrared light emitting diode (IR-LED) toward a bubble tube and detects the position of the bubble projection light with a light receiving element. The transmission type is known.

  The amount of light received from this light receiving element is detected, and the difference (A) in the amount of received light is compared with the difference (B) in the amount of light received in advance within a predetermined range of inclination. . This vertical determination sensor is specialized only for determining the verticality. For example, the inclination (angle) of the bubble tube is about 0.6 deg. The verticality tolerance range is freely set, and the verticality is determined by detecting the verticality.

  Patent Document 2 describes a device that automatically detects the balance (tilt) of a tire by photoelectrically detecting the deviation of the bubble from the center point of the level using a level having bubbles. ing.

  Patent Document 3 describes a slope collapse detection method that detects that a case has changed from a vertical posture to an inclined posture and transmits radio waves having a predetermined frequency. This collapse sensor portion uses switching due to the movement of mercury due to inclination, and outputs information of 0 (safe) or 1 (danger) for a certain inclination threshold.

JP 2009-25276 A JP 61-108943 A Japanese Patent Laid-Open No. 11-101638

  As described above, the bubble sensor of Patent Document 1 can accurately check the vertical degree of the ground or the like as a vertical determination sensor within a predetermined range, and the tire balance determination device of Patent Document 2 is the same place. It is possible to measure the balance of one tire. However, when there are a plurality of measurement target points, the system is not a system that comprehensively observes the inclination of the measurement target point.

  In addition, in the slope failure detection method described in Patent Document 3, information of 0 (safety) or 1 (dangerous) is given with respect to a certain inclination threshold, but a quantification of how much (amount) is inclined. Information is not available.

  The present invention has been made in view of such a background. An inclination change amount monitoring system that can obtain quantitative information on how much (amount) a certain region is inclined and can be monitored in time series. The purpose is to provide.

  In order to solve the above problem, the present invention provides a bubble tube, a tilt measuring device having an imaging unit that captures a bubble image of the bubble tube at regular intervals, and an analysis connected to the tilt measuring device in a communicable manner. An inclination change amount monitoring system, wherein the inclination measuring device includes a transmission unit that transmits image data of the bubble image to the analysis device at regular intervals, and the analysis device includes the image Receiving means for receiving data at regular intervals; coordinate calculating means for calculating the center coordinates of bubbles of the image data; inclination angle calculating means for calculating the inclination angle of the bubble tube from the coordinates of the bubbles; and the bubbles An angle difference calculating means for calculating a difference between an inclination angle of the tube and the bubble tube after a certain time, and determining whether the difference between the inclination angles is equal to or greater than a preset threshold value for the difference in inclination angle Discriminator When, it provides a tilt change monitoring system comprising: a.

  Moreover, it is preferable that the said analysis apparatus is further provided with the inclination direction calculation means which calculates the inclination direction of the said bubble tube from the coordinate of the said bubble.

  The tilt change amount monitoring system further includes an alarm device that is communicably connected to the analysis device, wherein the analysis device has a difference in the tilt angle that is equal to or greater than a preset threshold value for the tilt angle difference. In some cases, further comprising signal transmission means for transmitting a signal to the alarm device, wherein the alarm device receives the signal, alarm signal transmission means for issuing an alarm signal when the signal is received, It is preferable to provide.

  Further, in the tilt change monitoring system, the coordinate calculation means for calculating the coordinates of the bubbles of the image data in the analysis device stores a plurality of original image data in a database in advance and receives the image data by the receiving means. Sometimes, referring to the database, the image data and the original image data are collated to calculate the coordinates of the bubbles.

  Further, in the tilt change monitoring system, the tilt angle calculating means for calculating the tilt angle of the bubble tube from the coordinates of the bubble is obtained by storing relationship data between the bubble coordinates and the tilt angle of the bubble tube stored in advance. The inclination angle of the bubble tube may be calculated from the coordinates of the bubble.

  In the tilt change monitoring system, it is preferable that a plurality of tilt measuring devices are installed in a certain region.

In addition, a tilt change amount monitoring system including a bubble tube, a tilt measuring device having an imaging unit that captures a bubble image of the bubble tube every predetermined time, and an analysis device connected to be communicable with the tilt measuring device. The inclination change amount monitoring method according to the step, wherein the inclination measurement device transmits image data of the bubble image to the analysis device at regular intervals, and the analysis device comprises:
Receiving the image data at regular intervals, calculating the coordinates of bubbles in the image data, calculating the tilt angle of the bubble tube from the coordinates of the bubble, and the tilt angle of the bubble tube; Calculating a difference in inclination angle with the bubble tube after a certain time, and determining whether the difference in inclination angle exceeds a preset threshold value for the difference in inclination angle. An inclination change monitoring method is provided.

  According to the present invention, it is possible to obtain quantitative information on how much a certain region is tilted, and it is possible to realize a tilt change monitoring system capable of monitoring in time series.

It is the schematic of the inclination variation | change_quantity monitoring system which concerns on one Example of this invention. It is the schematic of the inclination measuring apparatus which concerns on one Example of this invention. 1 is a block diagram of an inclination change monitoring system according to an embodiment of the present invention. It is a flowchart which shows the process of the inclination measuring apparatus which concerns on one Example of this invention. It is a flowchart which shows the analysis process of the analyzer which concerns on one Example of this invention. It is the figure which looked at the bubble tube 2 when the inclination measuring apparatus A inclines from right above. It is the figure which looked at the bubble tube 2 when the inclination measuring apparatus A inclines from the side. It is the photograph which image | photographed the bubble of the bubble tube which concerns on one Example of this invention. It is a graph which shows the relationship between the inclination angle of the bubble tube which concerns on one Example of this invention, and the center coordinate value of a bubble. It is a block diagram of the inclination variation | change_quantity monitoring system which concerns on the other Example of this invention. It is the schematic of the inclination measuring apparatus provided with two bubble tubes and two cameras from which a sensitivity differs. It is the schematic of the inclination measuring apparatus provided with two bubble tubes and one camera from which a sensitivity differs.

  Hereinafter, an embodiment of the present invention will be specifically described with reference to the drawings.

  FIG. 1 shows a schematic configuration of a tilt change monitoring system described as an embodiment. As shown in FIG. 1, one embodiment of the tilt change monitoring system is transmitted from a tilt measuring device A (slave unit) installed at a measuring point such as a slope, a slope of a steep slope, and the tilt measuring device A. An analysis device (master device) B such as a personal computer that receives and analyzes information and an alarm device C that receives a signal transmitted from the analysis device B and issues an alarm.

  As shown in FIG. 1, a plurality of tilt measuring apparatuses A (slave devices) are installed at regular intervals on an inclined surface or a slope surface to be measured. It is desirable to install the tilt measuring device A (slave unit) in a hermetically sealed manner with a box and with measures against dust.

  FIG. 2 is a diagram showing a schematic configuration of the tilt measuring apparatus A. As shown in FIG. The circular bubble tube 2 has a spherical transparent plate 2a whose upper surface is convex upward, and a liquid with low viscosity and small bubbles 3 are enclosed inside. Although the circular bubble tube 2 is used in one embodiment of the present invention, the shape of the bubble tube 2 may be a cylindrical shape. The camera 1 is provided to face and face the upper part of the bubbles in the bubble tube 2. The camera 1 captures the behavior of the bubble 3 of the bubble tube 2 (movement of the bubble position, fluctuation of the bubble position, etc.) at regular intervals. When the bubble tube 2 is installed in a horizontal state, the bubble 3 is located at the center of the bubble tube 2.

  The inclination measuring device A is about 1-2 deg. The inclination range is usually 1 deg. Less than a small movement (small inclination) can be measured. By changing the curvature of the transparent plate 2a, for example, about 0.1-0.2 deg. Therefore, it is possible to select a wide range of inclination of the bubble tube 2 from high sensitivity to low sensitivity.

  FIG. 3 is a block diagram showing a schematic configuration of a tilt change monitoring system according to an embodiment of the present invention. As shown in the block diagram, the inclination measuring apparatus A mainly includes a camera 1, a bubble tube 2, a control microcontroller unit 4, and a wireless transmitter 5. The wireless transmitter 5 includes a wireless module unit.

  The inclination measuring apparatus A captures the bubbles 3 of the bubble tube 2 with a camera 1 at regular intervals to obtain image information (image data). The control microcontroller 4 is connected to the camera 1 and has a time control function so as to transmit an image at a predetermined time, and has functions such as a shooting start command and a shooting stop command to the camera 1. Further, the control microcontroller 4 captures image information (image data) of the bubbles 3 in the bubble tube 2 via the camera 1.

  Furthermore, the tilt measuring apparatus A has a built-in digital compass for enabling measurement in the tilt direction. With this digital compass, a plurality of inclination measuring devices A can be installed so as to have an angle (azimuth angle) from the same reference direction (north).

  The wireless transmitter 5 connected to the control microcontroller 4 is a receiver on the receiving side where image information (image data) regarding the bubbles 3 taken in by the control microcontroller 4 is installed at a distance from the inclination measuring device A. Alternatively, the data is transmitted to the analysis device B.

  As shown in FIG. 3, the analysis device (parent device) B includes a wireless receiver 6, an analysis unit 7 that analyzes data, and an alarm signal transmitter 8. The analysis unit 7 is connected to the wireless receiver 6 and analyzes image information (image data) captured by the wireless receiver 6 to obtain the inclination of the bubble tube 2. The alarm signal transmitter 8 transmits a signal to the alarm device C only when the inclination angle of the inclination measuring device A is equal to or larger than a preset threshold angle based on the result analyzed by the analysis unit 7.

  At this time, an alarm level may be set according to the difference between the tilt angle and the threshold angle, and a different signal may be transmitted. For example, the first level when the difference between the tilt angle and the threshold angle is relatively small (when attention is required), the second level when it is a certain size (when evacuation is required after several hours), When the signal is very large (when evacuation is required immediately), a signal having a level different from the third level can be transmitted.

  The alarm device C is installed at a distance from the analysis device B. The alarm device C is preferably installed in a place where there are many people, for example, a place close to a private house in order to enable an evacuation warning. The alarm device C includes an alarm signal receiver 9 and an alarm output unit 10. The alarm signal receiver 9 wirelessly receives the signal sent from the alarm signal transmitter 8, and the alarm output unit 10 is connected to the alarm signal receiver 9 and issues an alarm signal. The alarm signal is, for example, a siren or a rotating lamp.

  It is more effective to change the alarm signal according to the alarm level of the received signal. For example, it is conceivable to change the speed and brightness of the rotating lamp by changing the siren volume and sound type according to the alarm level.

  FIG. 4 is a flowchart (S100) showing the processing of the control microcontroller 4 of the inclination measuring apparatus A according to one embodiment of the present invention. In FIG. 4, the control microcontroller 4 of the tilt measuring apparatus A sends an activation command to the camera 1 and instructs the camera 1 to take an imaging command for the bubble 3 (S11), and the bubble tube 2 containing the bubble 3 is monitored. The camera 1 has a function of taking an image with the camera 1 every time (S12), and receiving and capturing an image (photographing data) of the bubble 3 taken with the camera 1 (S13). Next, the control microcontroller 4 transmits the image data of the bubbles 3 taken by the camera 1 to the wireless transmitter 5 (S14).

  Further, the control microcontroller 4 has a function of storing a predetermined number of times of photographing and a time (predetermined time) preset by the analysis apparatus B, and determines whether or not the predetermined number of times has passed (S15). If it has not elapsed and waits for the monitoring interval time (sleep) (S16), the camera 1 is instructed to take an image of the bubble 3 (S11). The wireless transmitter 5 transmits the received image data of the bubble 3 to the wireless receiver 6 of the analysis device B.

  FIG. 5 is a flowchart (S200) showing the processing of the analysis apparatus B according to an embodiment of the present invention. First, the analysis unit 7 sets a monitoring interval time Δt for monitoring the inclination of the region at a specified time and the total number N of imaging times (S21). Since imaging is performed once every monitoring interval time Δt, for example, when imaging is performed every 8 hours and imaging is performed twice in total (Δt = 8, N = 2), a total of 16 hours are required. The monitoring interval time and the number of times are changed according to the situation and the slope of the land where the inclination measuring device A is installed. Information of the monitoring interval time Δt and the number of imaging N is sent to the control microcontroller 4 of the tilt measuring apparatus A.

  The wireless receiver 6 of the analysis device B receives the image data transmitted from the wireless transmitter 5 of the inclination measuring device A, and delivers the image data to the analysis unit 7 (S22).

The analysis unit 7 obtains the pixel value (x ₀ , y ₀ ) of the center position of the bubble 3 in the coordinates in the bubble tube 2 that is the initial value from the first image data (S23). Fig.6 (a) is the figure which looked at the bubble tube 2 when the inclination measuring apparatus A inclines from right above. The coordinates of the center position of the bubble 3 are represented by pixel values (x ₀ , y ₀ ) as shown in the figure. When the bubble tube 2 is installed, if the pixel value (x ₀ , y ₀ ) at the center position of the bubble 3 is installed at the center of the coordinates, the initial value is (0, 0).

  Next, a method for detecting the direction of inclination will be described. In FIG. 6A, since the Y axis which is the reference of the tilt measuring apparatus A is installed so as to coincide with the north-south direction, the angle α between the tilt direction K and true north is expressed by the following formula 1 (several 1).

As described above, the pixel value (x ₀ , y ₀ ) at the center position of the bubble 3 is obtained by directly measuring the memory visually. However, the present invention is not limited to this method, and there is a template matching method.
With template matching, the image data of the bubble 3 imaged in advance at various inclination angles of the bubble tube 2 is stored in the database of the analysis unit 7 as an original image, and when the image of the bubble 3 is newly captured, The pixel value (x ₀ , y ₀ ) at the center position of the bubble 3 is obtained by executing a program for matching with the original image. Actually, the bubble tube 2 is changed every 4 ′ from 100 ′ (1 ° 40 ′) to −100 ′ (1 ° 40 ′) around the x axis, and a photograph (for example, FIG. 7) is taken to obtain an original image. The data was stored in the analysis unit 7.

  FIG. 7 is a photograph showing an example of photographing the bubbles 3 in the bubble tube 2. The camera 1 that took the picture of FIG. 7 used LinkSite LS-Y201, which is a JPEG camera. The communication speed of the camera of the camera unit 12 is 38400 bps, and Akizuki Denshi FT223RL is used as the serial conversion module unit.

The inclination angle θ of the bubble tube 2 of the inclination measuring device A is obtained from the obtained pixel values (x ₀ , y ₀ ) (S23). FIG. 6B is a diagram of the bubble tube 2 viewed from the side when the tilt measuring device A is tilted. As shown in FIG. 6B, the inclination angle is represented by an inclination angle θ with the zenith at 0 degree. The inclination angle θ of the bubble tube 2 can be obtained from the relationship between the radius of curvature of the transparent plate 2a of the bubble tube 2 and the pixel value (x ₀ , y ₀ ). When the radius of curvature of the transparent plate 2a is R, the initial position of the center of the bubble is (0, 0), and the position coordinates after the inclination are (x ₀ , y ₀ ), the inclination angle θ is expressed by the following formula 2 (number 2).

In (Expression 2), r represents the distance from the initial position (0, 0) to the center position of the bubble, and the relationship between this value and θ is calculated in advance and stored in the memory. Thus, it is possible to read θ from the value of r.

There is also a method of obtaining the inclination angle θ of the bubble tube 2 using FIG. FIG. 8 is a graph showing the relationship between the angle θ at which the bubble tube 2 is inclined and the pixel value (x ₀ , y ₀ ) that is the center position of the bubble 3. FIG. 8 shows that the bubble tube 2 is changed every 4 ′ from 100 ′ (1 ° 40 ′) to −100 ′ (1 ° 40 ′) around the x-axis by taking a picture, and viewing the image data to view the bubble 3 It is the graph which calculated | required the coordinate of the center position and calculated | required compared with the corresponding angle. Since the bubble tube 2 is tilted around x-axis, the bubble 3 moves along the y-axis direction, x ₀ did not substantially change. From this table, it was found that the value of y ₀ and the angle are in a certain proportional relationship.

The graph of FIG. 8 is stored in advance in the memory of the analysis unit 7 as relation data between the coordinates of the bubble 3 and the inclination angle θ of the bubble tube 2, so that the bubble tube is immediately obtained from the pixel value (x ₀ , y ₀ ). An inclination angle θ of 3 can be obtained. Alternatively, the conversion formula between the inclination angle and the center coordinate obtained from the graph of FIG. 8 is stored in the memory of the analysis unit 7 in advance, and the inclination angle θ of the bubble tube 3 is obtained from the pixel value (x ₀ , y ₀ ). it can.

  After a preset monitoring interval time Δt (for example, 8 hours) elapses, the wireless receiver 6 receives the image data of the bubble 3 again (S24). Similarly, the center coordinates (x, y) of the bubble 3 are calculated from the image data of the bubble 3, and the inclination angle θ is obtained. At this time, the inclination direction α (azimuth angle from the north) can be obtained simultaneously. Then, the difference (δθ) in the inclination of the bubble tube 2 inclined at the monitoring interval time is obtained (S25).

The difference (δθ) in the inclination of the bubble tube 2 is represented by δθ = θ _n −θ ₀ (n ≧ 1). That is, the difference between the initial value θ ₀ and the current inclination θ _{n is} the difference in inclination. Thereby, it is calculated how many times the bubble tube 2 is tilted up to the current measurement (n times). At this time, the difference θ _n −θ _n−1 from the previous inclination may be simultaneously obtained and stored in the memory of the analysis unit 7. By obtaining not only the difference between the initial value θ ₀ and the current inclination θ _n but also the difference between the previous inclination and the current inclination, it is possible to more easily know the degree of inclination for each hour. Here, n indicates the number of times of imaging after the monitoring interval time Δt. For example, when Δt = 8 hours, n is 1 (inclination angle θ ₁ ) when imaging is performed 8 hours after the start of imaging, and imaging is performed after 16 hours. In this case, n is 2 (inclination angle θ ₂ ).

  Next, it is determined whether or not the difference in inclination (δθ) of the bubble tube 2 is equal to or greater than a preset threshold angle (S26). The threshold angle is changed according to the situation such as the land where the inclination measuring device A is installed, the inclination gradient, and the like. When the difference (δθ) in the inclination of the bubble tube 2 is equal to or greater than a preset threshold angle, information is sent from the analysis unit 7 to the alarm signal transmitter 8, and the alarm signal transmitter 8 alerts the alarm device C. A signal is sent (S27). At this time, as described above, the alarm level may be set according to the difference between the inclination difference (δθ) of the bubble tube 2 and the threshold angle, and different signals may be transmitted. The alarm device C receives a signal from the analysis device B, activates a rotating lamp, a siren, and the like according to the alarm level, and issues an alarm.

  After the analysis device B transmits an alarm signal (S27), it is determined whether or not the tilt measurement device A can be detected (S29), and observation is continued as long as detection is possible. Depending on the bubble tube used, the maximum tilt angle can be detected up to about 20 degrees. At this time, because of an abnormal situation, the monitoring interval time Δt is set shorter than normal, and the number N is set again so as to be larger than normal (S21).

  When the difference (δθ) in the inclination of the bubble tube 2 is smaller than a preset threshold angle, it is determined whether or not the current number of times of photographing n has reached a preset number of times (N) ( S28). If the current number of times n has reached a predetermined number (N) set in advance, the processing of the analysis apparatus B is terminated. If the current number n of images has not reached the predetermined number (N) set in advance, the image is received again after the monitoring interval time Δt has elapsed (S24), and the analysis processing (S25 to 28) is repeated.

  In the flowchart described above, the monitoring interval time Δt and the number of times N are set in step 21. However, if the monitoring interval time Δt is set, the number of monitoring times (N) may not be set. As an advantage of setting the number of times of monitoring (N), it is possible to prevent a useless monitoring state in which the inclination measuring device A and the analyzing device B are always activated, and there is also a power saving effect.

  If the number of times of monitoring (N) is not set, in the flowchart of the inclination measuring apparatus A of FIG. 4, the process proceeds to the monitoring interval time Δt waiting of S16 without going through the determination (S15) of whether the number of times of monitoring has passed. Imaging is repeated at every monitoring interval time Δt.

  In the flowchart of the analysis apparatus B in FIG. 5, it is determined whether or not the number of times of monitoring has elapsed after it is determined in S26 that the difference in inclination (δθ) of the bubble tube 2 is not equal to or greater than a preset threshold angle ( Without passing through S28), after the monitoring interval time Δt has elapsed, the process returns to the step of receiving the image again (S24).

  As described above, the contents of the flowchart of FIG. 5 have been described. However, what has been executed in the flowchart can be utilized for the next monitoring. For example, when the difference (δθ) in the inclination of the bubble tube 2 is smaller than a preset threshold angle and the current number of times of photographing n has reached a preset number of times (N), the monitoring interval is reached. More effective monitoring can be performed by increasing the time (for example, setting 8 hours to 12 hours) and setting again to reduce the total number of imaging (N). .

  Further, as another embodiment of the present invention, a tilt change monitoring system including the function of the analysis device (master device) B described above in the tilt measurement device A (slave device) will be described. FIG. 9 is a block diagram showing a schematic configuration of a tilt change monitoring system according to another embodiment of the present invention. As shown in the block diagram, the tilt measuring apparatus A mainly includes a camera 1, a bubble tube 2, a control microcontroller unit 4 including an analysis unit 7, and an alarm signal transmitter 8.

  The inclination measuring apparatus A captures the bubbles 3 of the bubble tube 2 with a camera 1 at regular intervals to obtain image information (image data). The control microcontroller 4 is connected to the camera 1 and has a time control function so as to transmit an image at a predetermined time, and has functions such as a shooting start command and a shooting stop command to the camera 1. Specifically, images are taken at regular intervals according to the procedure described in the flowchart of FIG. Further, the control microcontroller 4 captures image data of the bubbles 3 in the bubble tube 2 via the camera 1.

  The analysis unit 7 in the control microcontroller unit 4 analyzes the image data according to the procedure described in the flowchart of FIG. 5 to obtain the inclination of the bubble tube 2. The alarm signal transmitter 8 transmits a signal to the alarm device C only when the inclination angle of the inclination measuring device A is equal to or larger than a preset threshold angle based on the result analyzed by the analysis unit 7. At this time, as described above, an alarm level is set according to the difference between the tilt angle and the threshold angle, and a different signal is transmitted.

  In the embodiment described above, the case where a plurality of inclination measuring devices A are installed has been described. However, only one inclination measuring device A may be provided. Moreover, as shown in FIG. 10 or FIG. 11, two cameras and bubble tubes (FIG. 10) may be installed in one inclination measuring device A, or two bubble tubes in one camera. (FIG. 11) may be installed. As shown in FIG. 10 and FIG. 11, practically high sensitivity (a large curvature radius of the transparent plate 2a) for viewing minute fluctuations in the initial stage and low sensitivity (for measuring a wide angle range) If a bubble tube with a small radius of curvature of the transparent plate 2a is installed, the angle can be measured more quantitatively.

  FIG. 10 is a schematic diagram of two tilt measuring devices that capture images of two bubble tubes with different sensitivities. FIG. 11 is a schematic diagram of a tilt measuring apparatus that uses the partial reflection mirror 11 and the mirror 12 to image two bubble tubes having different sensitivities with a single camera. As shown in FIG. 11, when imaging one bubble tube having different sensitivities, it is necessary to separate the bubble tubes so that the two bubble tubes can be distinguished from the image data by alternately irradiating the bubble tubes.

  In addition, the tilt measuring apparatus A according to an embodiment of the present invention employs a method in which the bubble tube 2 is positioned below the camera 1, the bubble tube 2 is looked down from above, and the bubble 3 is photographed from above. Alternatively, a method may be employed in which the bubble tube 2 is positioned above the camera 1, the bubble tube 2 is looked up from below, and the bubble 3 is photographed from below.

  As described above, according to the embodiment of the present invention, it is possible to obtain quantitative information indicating in which direction (direction) how much (amount) a certain region is inclined, and the amount of change in inclination that can be monitored in time series. A monitoring system can be realized.

  Thereby, the initial minute change of the measurement point can be measured, for example, warning of land change accompanied by danger such as landslide can be made at an earlier stage than before, and safety of human life can be ensured. In addition, since the amount of change in inclination can be monitored efficiently over a wide range, there is an effect of reducing the administrative work burden in the area.

  DESCRIPTION OF SYMBOLS 1 ... Imaging device (camera), 2 ... Bubble tube, 2a ... Transparent plate, 3 ... Bubble, 4 ... Control microcontroller, 5 ... Wireless transmitter, 6 ... Wireless receiver, 7 ... Analysis part, 8 ... Alarm signal transmission 9 ... alarm signal receiver, 10 ... alarm output unit, 11 ... partial reflecting mirror, 12 ... mirror, A ... tilt measuring device, B ... analyzing device, C ... alarm device.

Claims (7)

A tilt measuring device having a bubble tube and an imaging means for capturing a bubble image of the bubble tube at regular intervals;
An analysis device communicably connected to the tilt measurement device;
An inclination change monitoring system including
The tilt measuring device includes:
Transmission means for transmitting image data of the bubble image to the analysis device at regular intervals;
The analysis device includes:
Receiving means for receiving the image data at regular intervals;
Coordinate calculation means for calculating the center coordinates of the bubbles of the image data;
An inclination angle calculating means for calculating an inclination angle of the bubble tube from the coordinates of the bubbles;
An angle difference calculating means for calculating a difference in inclination angle between the bubble tube and the bubble tube after a certain time;
And a discriminating means for discriminating whether or not the difference in tilt angle is equal to or greater than a preset threshold value for the tilt angle difference. The inclination change monitoring system according to claim 1,
The analysis apparatus further includes an inclination direction calculating unit that calculates an inclination direction of the bubble tube from the coordinates of the bubbles. In the inclination change amount monitoring system according to claim 1 or 2,
Further comprising an alarm device communicatively connected to the analysis device;
The analysis device further includes signal transmission means for transmitting a signal to the alarm device when the difference in the tilt angle is equal to or greater than a preset threshold value for the difference in the tilt angle.
The alarm device is
Signal receiving means for receiving the signal;
And a warning signal transmission means for generating a warning signal when the signal is received. The inclination change amount monitoring system according to any one of claims 1 to 3,
Coordinate calculation means for calculating the coordinates of the bubbles of the image data in the analysis device,
A plurality of original image data is stored in a database in advance, and when the image data is received by the receiving means, the database is referred to, the image data and the original image data are collated, and the coordinates of the bubbles are calculated. about,
An inclination change monitoring system characterized by The inclination change amount monitoring system according to any one of claims 1 to 4,
An inclination angle calculating means for calculating an inclination angle of the bubble tube from the coordinates of the bubbles,
Referring to the relationship data between the coordinates of the bubble and the inclination angle of the bubble tube stored in advance, and calculating the inclination angle of the bubble tube from the coordinates of the bubble;
An inclination change monitoring system characterized by In the inclination change amount monitoring system according to any one of claims 1 to 5,
A tilt change monitoring system, wherein a plurality of tilt measuring devices are installed in a certain area. A tilt measuring device having a bubble tube and an imaging means for capturing a bubble image of the bubble tube at regular intervals;
An analysis device communicably connected to the tilt measurement device;
An inclination change monitoring method by an inclination change monitoring system including
The tilt measuring device is
Transmitting image data of the bubble image to the analysis device at regular intervals;
The analysis device is
Receiving the image data at regular intervals;
Calculating the coordinates of bubbles in the image data;
Calculating the angle of inclination of the bubble tube from the coordinates of the bubble;
Calculating a difference in inclination angle between the bubble tube and the bubble tube after a predetermined time;
And a step of determining whether or not the difference in inclination angle exceeds a preset threshold value for difference in inclination angle.

Images