JP2009014554A - Inclination angle detector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inclination angle detector for accurately detecting fluctuation in an inclination angle. <P>SOLUTION: In cases where the intensity of a magnetic field formed between the N pole 25a and S pole 25b of a magnet 25 changes owing a change in the temperature of the magnet 25, the value of an electric current flowing through a magnetic field correction coil 28 is adjusted according to the temperature of the magnet detected by a temperature sensor 50. By together using in this way the magnetic field formed by the magnet 25 and a magnetic field formed by the correction coil 28, the intensity of the magnetic field formed between the N pole 25a and S pole 25b can be made constant independently of the temperature of the magnet 25b. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an inclination angle detection device used for measuring, for example, an inclination of an inclined land.

Sediment disasters caused by ground abnormalities such as landslides, landslides, and depressions cause enormous damage to the lives and property of local residents. Therefore, it is desired to detect landslides in advance and use them to evacuate local residents. Therefore, for example, each measuring device such as a ground inclinometer that measures the inclination angle of the ground is installed at an observation site where a ground abnormality is likely to occur, and a monitoring device is installed in a place where damage due to the ground abnormality does not occur. The observation information measured in is displayed on the screen and reported to the monitor. Therefore, when it is judged that the situation where ground abnormalities are likely to occur based on the observation information, the monitoring staff informs relevant organizations such as local government offices where the damage due to ground abnormalities is likely to occur. The organization provides evacuation advisories and warnings to prevent the spread of damage and realize early recovery (see, for example, Patent Document 1).
Japanese Patent Laying-Open No. 2003-6775 (FIG. 2)

  As shown in FIG. 5, the ground inclinometer 120 is disposed between a magnet 125 having an N pole 125 a and an S pole 125 b facing each other, and an N pole 125 a and an S pole 125 b of the magnet 125. There is provided a movable coil 123 that can rotate around a shaft 124, a pendulum 121 connected to the movable coil 123 via a support rod 122, and a pendulum position detector 126 that can detect the position of the pendulum 121. is there. In the ground inclinometer 120, when the inclination angle of the inclined ground fluctuates, the pendulum 121 moves accordingly, and the movable coil 123 rotates by the amount of rotation corresponding to the amount of movement. At this time, the pendulum position detector 126 detects the distance to the pendulum 121, and a current is passed through the movable coil 123 so that the detected distance is maintained constant. Then, the movable coil 123 is rotated by the electromagnetic force in the magnetic field formed between the N pole 125a and the S pole 125b of the magnet 125, and the position of the pendulum 121 is maintained at a predetermined position. Based on the current value flowing through the movable coil 123 at this time, the amount of change in the inclination angle of the inclined ground is detected.

  Here, the strength of the magnetic field formed between the N pole 125 a and the S pole 125 b of the magnet 125 often varies depending on the temperature of the magnet 125. Therefore, when the current value of the movable coil 123 is controlled based on the strength of the magnetic field of the magnet 125 at a predetermined temperature regardless of the temperature of the magnet 125, an error occurs in the detected change amount of the tilt angle. . Further, in order to keep the strength of the magnetic field formed between the N pole 125a and the S pole 125b of the magnet 125 constant regardless of the temperature, it is conceivable that the magnet 125 is composed of an electromagnet. However, there is a problem that the power consumption is remarkably increased.

  Therefore, a main object of the present invention is to provide an inclination angle detection device that can detect an inclination angle with high accuracy.

Means for Solving the Problems and Effects of the Invention

  The tilt angle detecting device of the present invention has a north pole and a south pole arranged so as to face each other, a magnet for forming a magnetic field between the north pole and the south pole, the north pole and the south pole. A magnetic field correction coil provided around both of the poles and capable of forming a magnetic field between the N pole and the S pole by passing an electric current; and a current value flowing through the magnetic field correction coil is adjusted. 1 current adjustment means, a movable member that receives a force corresponding to the amount of change in the tilt angle of the detected object, and a position that faces the movable member, and can detect the position of the movable member A position detection sensor, a movable coil connected to the moving member and moving between the N pole and the S pole by an amount corresponding to the moving amount of the moving member, and a current value flowing through the movable coil A second current adjusting means for adjusting The first current adjusting means is controlled so that the strength of the magnetic field formed between the N pole and the S pole becomes a predetermined value, and is opposite to the rotation direction based on the change in the tilt angle of the detected object. Control means for controlling the second current adjusting means to move the movable coil so that the position of the moving member detected by the position detection sensor in a direction is constant; and the second current adjusting means Inclination angle detecting means for detecting the amount of change in the inclination angle of the detected object from the amount of adjustment of the current value at.

  According to this configuration, the intensity of the magnetic field formed between the north and south poles of the magnet can be made constant by adjusting the value of the current flowing through the magnetic field correction coil. Therefore, even when the strength of the magnetic field formed between the N pole and the S pole of the magnet changes according to the temperature of the magnet, for example, the change amount of the tilt angle can be detected with high accuracy. Moreover, by using both the magnetic field by a magnet and the magnetic field by an electromagnet, it can suppress that power consumption increases compared with the case where only the magnetic field by an electromagnet is utilized.

  In the tilt angle detection device of the present invention, the temperature detection means for detecting the temperature of the magnet, each temperature of the magnet, and the strength of the magnetic field formed between the N pole and the S pole become predetermined values. Storage means for storing a relationship with a current value to be passed through the magnetic field correction coil in order to achieve the control, and the control means stores the temperature detected by the temperature detection means and the storage means. Based on the relationship between the temperature and the current value, the first current adjusting means may be controlled so that the strength of the magnetic field formed between the N pole and the S pole becomes a predetermined value. .

  According to this configuration, even when the magnet temperature changes due to the environmental temperature at which the tilt angle detection device is installed, and the strength of the magnetic field formed between the N pole and the S pole changes, the magnetic field correction coil By adjusting the value of the current flowing in the magnet, the strength of the magnetic field formed between the N pole and S pole of the magnet can be made constant. Therefore, it is possible to accurately detect the amount of change in the tilt angle regardless of the environmental temperature in which the tilt angle detection device is installed.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a schematic configuration of a sediment disaster prior detection alarm system including a ground inclinometer according to an embodiment of the present invention. FIG. 2 is a diagram showing an example of the arrangement of observation stations and slave stations included in the earth and sand disaster pre-detection alarm system of FIG.

  As shown in FIG. 1, the earth and sand disaster pre-detection alarm system is installed in an observation site 10 where there is a risk of ground abnormality, and an observation device 1 for detecting observation information used for prediction of ground abnormality, Collecting information, obtaining prediction information for ground anomalies based on the collected observation information, and collecting observation information with observation station 2 that transmits these prediction information and observation information, and ground anomalies based on the collected observation information Communication information to the slave station 3 that transmits the prediction information and the observation information to the observation station 2 by wireless communication, the communication mechanism 4 to the local residents of the observation site 10, and the related organization 5 that deals with the ground abnormality. The monitoring station 6 is connected via a line 7 and receives prediction information and observation information transmitted from the observation station 2 and notifies the communication mechanism 4 and related organizations 5 in parallel.

  An observation device 1 installed at a dangerous place of ground abnormality in the observation place 10 includes a ground inclinometer 11 that detects the inclination angle of the ground, and GPS observation that detects position information including the latitude, longitude, and height position of the ground. A device 12, a groundwater level meter 13 for detecting the level of groundwater, an in-hole extensometer 14 for detecting the expansion / contraction length of a hole formed at a predetermined depth and a predetermined length from the ground, and a rainfall per unit time. It consists of at least one or more combinations with the rain gauge 15. And the observation apparatus 1 is comprised so that information, such as an inclination angle detected by each apparatus 11-15, may be output as observation information.

  The observation device 1 is directly connected to the observation station 2 and the slave station 3 via a signal cable 16 made of a metal cable. The observation station 2 and the slave station 3 are connected in the form of a wireless LAN 17, and a plurality of slave stations 3 can communicate with one observation station 2.

  As shown in FIG. 1, the observation station 2 is connected to the monitoring station 6 via a communication line 62. The monitoring station 6 includes an automatic voice response / notification device 64, an information monitoring terminal device 65, a printer 66, a data storage device 67, a data processing device 68, and a web server 69. The automatic voice response / notification device 64 can automatically provide ground abnormality prediction information in response to inquiries from local residents. In addition, as shown in FIG. 2, the information monitoring terminal device 65 can display all information such as observation information and prediction information transmitted from the observation stations 2 distributed in various places.

  The data storage device 67 is composed of a disk array or a magnetic tape capable of recording a large amount of data, and can record observation information and prediction information collected from the observation stations 2 in various places. The data processing device 68 has a function of controlling the overall operation of the monitoring station 6 and obtains wide-area prediction information and long-term prediction information based on observation information and prediction information collected from the observation stations 2 in various places. It has a function. The web server 69 publishes processing results and observation information in the data processing device 68 and prediction information from the observation stations 2 in various places on the Internet via the communication line 7.

  The monitoring station 6 is connected to a local resident's mobile phone 71, fixed telephone 72, and facsimile machine 73 via a general line 70, and can receive sighting information, precursor information, and disaster information transmitted from the local resident. Has been. The general line 70 can be connected to the automatic voice response / notification device 64, and the local residents can hear the prediction information of ground abnormalities by voice.

  The monitoring station 6 is connected to the related organization 5 via a communication line 7 such as an ISDN line, an optical cable line, or a multiple radio line. It should be noted that the connection form between the monitoring station 6 and the related organization 5 may be made possible via a public signal network on the Internet or via a closed signal network such as a dedicated line. May be contacted. There are evacuation centers, public halls, post offices, etc. as related organizations 5 in the vicinity of the observation site. These related organizations 5 are provided with information terminals 74 such as a personal computer, a notification device such as a telephone 75, a facsimile machine 76, and an information bulletin board 77.

  These notification devices can notify local residents by displaying disaster information, evacuation information, evacuation / safety information, injured information, etc. when the related organization 5 receives instructions and information from the monitoring station 6. The observation information can be displayed even in normal times. In addition, as the related organizations 5 remote from the observation site, there are national governments, prefectures, regulatory agencies such as government offices, related municipalities, etc., and these related organizations 5 determine the extent of damage based on the prediction information from the monitoring station 6 We know the degree and are preparing for recovery.

  Further, a stationary emergency slave station 78 a is connected to the monitoring station 6 via a general line 70. The emergency slave station 78a is activated when there is a high possibility of a ground abnormality, and can be connected to a personal computer 79 or a mobile phone 80 owned by a local resident. Furthermore, a portable mobile phone 80 and a personal computer 79 can be connected to the monitoring station 6 and the emergency slave station 78a as an emergency slave station 78b. These emergency slave stations 78a and 78b are capable of bidirectionally transmitting and receiving prediction information and damage information. Further, a communication mechanism 4 is connected to the monitoring station 6. The communication mechanism 4 includes a door-to-door receiver 81, an outdoor loudspeaker 82, a public information vehicle 83, an information display board 84, and the like.

  Next, a schematic configuration of the ground inclinometer 11 will be described with reference to FIG. FIG. 3 is a diagram showing a schematic configuration of the ground inclinometer.

  As shown in FIG. 3, the ground inclinometer 11 includes an inclination angle detection mechanism 20 and a control unit 30.

  The tilt angle detection mechanism 20 is disposed in the vicinity of the pendulum 21, the movable coil 23 connected to the pendulum 21 via the support rod 22, the magnet 25 disposed in the vicinity of the movable coil 23, and the pendulum 21. And a pendulum position detector 26.

  The magnet 25 has a substantially cylindrical shape, and a part of its circumference is cut. A magnetic field is formed between the N pole 25a that is one end of the magnet 25 and the S pole 25b that is the other end. A temperature sensor 50 capable of detecting the temperature of the magnet 25 is attached to the upper surface of the magnet 25. The temperature sensor 50 is connected to the control unit 30.

  Here, a magnetic field correction coil 28 is provided around the N pole 25 a and the S pole 25 b of the magnet 25. Both end portions of the magnetic field correction coil 28 are connected to the first current adjustment unit 40. Therefore, when a current flows through the magnetic field correction coil 28 by controlling the first current adjustment unit 40, the magnetic field correction coil 28 forms a magnetic field between the N pole 25 a and the S pole 25 b of the magnet 25.

  That is, when no current flows through the magnetic field correction coil 28, only the magnetic field by the magnet 25 is formed between the N pole 25a and the S pole 25b of the magnet 25. On the other hand, when a current flows through the magnetic field correction coil 28, both the magnetic field by the magnet 25 and the magnetic field by the magnetic field correction coil 28 are formed between the N pole 25 a and the S pole 25 b of the magnet 25. The

  The movable coil 23 is disposed between the N pole 25a and the S pole 25b of the magnet 25, and is supported rotatably about the rotation shaft 24. The rotating shaft 24 is disposed so as to be parallel to the axial direction of the magnet 25. Both ends of the movable coil 23 are connected to the second current adjustment unit 41. Therefore, when a current flows through the movable coil 23 by controlling the second current adjusting unit 41, the movable coil 23 is generated by an electromagnetic force in a magnetic field formed between the N pole 25a and the S pole 25b of the magnet 25. Rotates.

  The pendulum 21 is supported by a support rod 22 provided perpendicular to the rotating shaft 24 of the movable coil 23, and can be rotated together with the movable coil 23 about the rotating shaft 24. Here, when the inclination angle of the ground changes, the pendulum 21 receives a force corresponding to the change amount of the inclination angle and tries to move around the rotation shaft 24.

  The pendulum position detector 26 is arranged so as to face the pendulum 21, and detects the position of the pendulum 21, that is, the distance to the pendulum 21. The pendulum position detector 26 is connected to the control unit 30.

  The control unit 30 includes a temperature detection unit 31, an adjustment current storage unit 32, a pendulum position detection unit 33, a current control unit 34, and an inclination angle detection unit 35.

  The temperature detector 31 detects the temperature of the magnet 25 based on the detection signal from the temperature sensor 50.

  When the intensity of the magnetic field between the N pole and the S pole of the magnet 25 is maintained at a predetermined value, the adjustment current storage unit 32 has the magnet 25 detected by the temperature detection unit 31 as shown in Table 1. The relationship between each temperature and the value of the current flowing through the magnetic field correction coil 28 is stored.

  Here, the relationship between each temperature of the magnet 25 detected by the temperature detector 31 and the value of the current flowing through the magnetic field correction coil 28 will be described with reference to FIGS. 4 (a) to 4 (c). FIG. 4A is a graph showing the relationship between the temperature of the magnet and the strength of the magnetic field. FIG. 4B is a graph showing the relationship between the temperature of the magnet and the correction value at that time. FIG. 4C is a graph showing the relationship between the current value flowing through the magnetic field correction coil and the strength of the magnetic field formed by the magnetic field correction coil.

  In the present embodiment, as shown in FIG. 4A, when the temperature of the magnet 25 is T0, the strength of the magnetic field formed between the N pole 25a and the S pole 25b of the magnet 25 is A0. Consider a case where the strength of the magnetic field decreases as the temperature of the magnet 25 increases. That is, the magnetic field intensity at which the temperature of the magnet 25 was A0 at T0 is reduced to A1 at temperature T1, A2 at temperature T2,..., And An at temperature Tn.

  In the magnet 25 having such temperature characteristics, in order to maintain the strength of the magnetic field formed between the N pole 25a and the S pole 25b of the magnet 25 at A0 regardless of the temperature, the magnetic field correction coil 28 is used. It is necessary to form a magnetic field having a strength as shown in FIG.

  Further, as shown in FIG. 4C, there is a proportional relationship between the value of the current flowing through the magnetic field correction coil 28 and the strength of the magnetic field formed by the magnetic field correction coil 28. Therefore, in order to form the magnetic field having the strength shown in FIG. 4B by the correction coil 28, it is necessary to pass the current I1 when the temperature of the magnet 25 is T1, and when the temperature T2, I2,. It can be seen that the current of In needs to flow in Tn. In this way, Table 1 showing the relationship between each temperature of the magnet 25 and the current value flowing through the magnetic field correction coil 28 is obtained.

  The pendulum position detector 33 detects the amount of movement of the pendulum 21 from a predetermined position based on the detection signal from the pendulum position detector 26.

  The current control unit 34 controls the first current adjustment unit 40 that adjusts the value of the current flowing through the magnetic field correction coil 28. That is, the current control unit 34 maintains the strength of the magnetic field formed between the N pole 25a and the S pole 25b of the magnet 25 at a predetermined value at the temperature of the magnet 25 detected by the temperature detection unit 31. The first current adjustment unit 40 is controlled so that a current that needs to flow through the magnetic field correction coil 28 flows.

  Further, the current control unit 34 controls the second current adjustment unit 41 that adjusts the value of the current flowing through the movable coil 23. That is, the current control unit 34 adjusts the value of the current flowing through the movable coil 23 to return the pendulum 21 to the predetermined position based on the amount of movement of the pendulum 21 from the predetermined position detected by the pendulum position detection unit 33. The second current adjustment unit 41 is controlled. Therefore, the movable coil 23 generates a force corresponding to the force received by the pendulum 21 in the direction opposite to the rotation direction based on the change in the inclination angle of the ground.

  The inclination angle detection unit 35 detects the amount of change in the inclination angle of the ground based on the adjustment amount of the current value of the second current adjustment unit 41.

  As described above, in the ground inclinometer 11 according to the present embodiment, the temperature of the magnet 25 changes depending on the environmental temperature in which the device is installed, and is formed between the N pole 25a and the S pole 25b. Even when the strength of the magnetic field changes, the value of the current flowing through the magnetic field correction coil 28 is adjusted to make the strength of the magnetic field formed between the N pole 25a and the S pole 25b of the magnet 25 constant. be able to. Therefore, regardless of the environmental temperature at which the ground inclinometer 11 is installed, the amount of change in the inclination angle can be detected with high accuracy. Moreover, by using both the magnetic field by the magnet 25 and the magnetic field by the magnetic field correction coil 28, it is possible to suppress an increase in power consumption compared to the case of using only the magnetic field by the electromagnet.

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and various design changes can be made as long as they are described in the claims. For example, in the above-described embodiment, the temperature is measured and correction is performed so that the strength of the magnetic field is constant. However, a magnetic field sensor that measures the magnetic field is provided instead of the temperature sensor, and the output of the magnetic field sensor is It may be made constant. In the above-described embodiment, the case is described where the strength of the magnetic field formed between the N pole 25a and the S pole 25b of the magnet 25 changes as the temperature of the magnet 25 changes. Even if the strength of the magnetic field formed between the N pole 25a and the S pole 25b of the magnet 25 changes due to other reasons, the present embodiment and the effect of shaking can be obtained.

It is a figure which shows schematic structure of the earth and sand disaster prior detection alarm system containing the ground inclinometer which concerns on embodiment of this invention. It is a figure which shows an example of arrangement | positioning of the observation station and slave station which are included in the earth and sand disaster prior detection warning system of FIG. It is a figure which shows schematic structure of the ground inclinometer which concerns on embodiment of this invention. FIG. 4A is a graph showing the relationship between the temperature of the magnet and the strength of the magnetic field. FIG. 4B is a graph showing the relationship between the temperature of the magnet and the correction value at that time. FIG. 4C is a graph showing the relationship between the current value flowing through the magnetic field correction coil and the strength of the magnetic field formed by the magnetic field correction coil. It is a figure which shows schematic structure of the conventional ground inclinometer.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Ground inclination meter 20 Inclination angle detection mechanism 21 Pendulum 23 Movable coil 25 Magnet 26 Pendulum position detector 28 Magnetic field correction coil 30 Control part 31 Temperature detection part 32 Adjustment current value memory | storage part 33 Pendulum position memory | storage part 34 Current control part 35 Inclination angle Detector 50 Temperature sensor

Claims (2)

A magnet having a north pole and a south pole arranged so as to face each other, and forming a magnetic field between the north pole and the south pole;
A magnetic field correction coil provided around both the N pole and the S pole, and capable of forming a magnetic field between the N pole and the S pole by passing a current;
First current adjusting means for adjusting a current value flowing through the magnetic field correction coil;
A movable member that receives a force corresponding to the amount of change in the tilt angle of the detected object;
A position detection sensor arranged to face the moving member and capable of detecting the position of the moving member;
A movable coil connected to the moving member and moving by an amount corresponding to the moving amount of the moving member between the N pole and the S pole;
Second current adjusting means for adjusting a current value flowing through the movable coil;
The first current adjusting means is controlled so that the strength of the magnetic field formed between the N pole and the S pole becomes a predetermined value, and the rotation direction based on the change in the tilt angle of the detected object Control means for controlling the second current adjusting means so as to move the movable coil so that the position of the moving member detected by the position detection sensor is constant in the opposite direction;
An inclination angle detecting device comprising: an inclination angle detecting means for detecting an amount of change in the inclination angle of the detected object from an adjustment amount of the current value in the second current adjusting means. Temperature detecting means for detecting the temperature of the magnet;
A memory for storing the relationship between each temperature of the magnet and the value of the current that flows through the magnetic field correction coil when the intensity of the magnetic field formed between the N pole and the S pole is set to a predetermined value. And further comprising means,
Based on the temperature detected by the temperature detection means and the relationship between the temperature stored in the storage means and the current value, the control means is a magnetic field strength formed between the N pole and the S pole. 2. The tilt angle detection apparatus according to claim 1, wherein the first current adjusting unit is controlled such that the first current adjusting unit has a predetermined value. 3.

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