JPH11125678A - Device and method for measuring azimuth of terrestrial magnetism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To measure an absolute azimuth of the terrestrial magnetism at a place not easily accessibly, by integrally constituting a device with a gyro compass, a means for measuring the azimuth of the terrestrial magnetism, a memory, a power source battery, etc. SOLUTION: In a terrestrial magnetism measuring device, a gyro compass 10 detecting the azimuth of this measuring device, a terrestrial magnetism detection sensor 20 obtaining the component of the terrestrial magnetism in each direction, an A/D converter 30, a memory 40, a data transmission means 50 and a power source battery 60, for example, are integrally provided. After lowering the terrestrial magnetism azimuth measuring device in a boring hole, for example, and measuring the azimuth of the terrestrial magnetism, the device is recovered. From the lowering to the recovery, the analog signals of the gyro compass 10 and a terrestrial magnetism detection sensor 20 are processed with an A/D converter 30, and stored in a sampling memory 40 with a specific period. After recovery, the absolute azimuth of the terrestrial magnetism is obtained with external components. It could be also constituted to assemble such control means as measuring apparatuses of various physical quantities and a scheduler.

Description

DETAILED DESCRIPTION OF THE INVENTION

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a geomagnetic azimuth measuring device for determining the azimuth of terrestrial magnetism, and various kinds of physical quantities installed in places that are not easily accessible to humans based on the azimuth of the terrestrial magnetism obtained by the terrestrial magnetic azimuth measuring device Direction measurement method for determining the direction of a device that measures

[0002]

2. Description of the Related Art When a seismometer or strain gauge is installed in a borehole drilled in the ground, it is necessary to know the orientation of the installed equipment. The following methods are known as one means to determine the orientation of the device that measures various physical quantities.

[0003] 1) The pedestal of the device is installed in the borehole, 2) A magnetic compass with a timer set is hung with a wire, and lowered until the magnetic compass comes into contact with the installed pedestal. 3) The descent is completed. After that, take a picture of the direction of the magnetic needle with the built-in film according to the timer. 4) Pull up the magnetic compass and obtain the geomagnetic direction from the position of the magnetic needle in the photograph. 5) The direction of the pedestal based on the obtained geomagnetic direction 5) Obtain the azimuth of the device that measures the various physical quantities from the azimuth of the pedestal.

In addition, a compass with a gyro compass is hung on a wire and lowered from the ground with a control signal line attached between the compass and a control device on the ground, and brought into contact with a pedestal. There is a method to measure the orientation of the pedestal by using, and to determine the orientation of the above equipment from the orientation of the pedestal.

[0005]

According to the above conventional method, a pedestal must be buried in a borehole before a device for measuring various physical quantities is installed, and a geomagnetic compass is hung on the pedestal by a wire. Must. When the compass is fixed, a foreign object such as a stone or sand may be caught between the buried pedestal and the compass, which may be an obstacle to fix the compass to the pedestal. When fixing the compass with a gyro compass, it is necessary to work so as not to damage the control signal line attached to the gyro compass. In any method, the work which takes into account the extension of the wire is required in order to suspend the compass with the wire and lower it. If the weight of the compass is incorrectly estimated, the amount of elongation of the wire is different from expected, and the compass and the pedestal collide violently, and the compass may be damaged. Also, if there is a magnetic material near the target place such as a volcanic area and the azimuth of the terrestrial magnetism is disturbed, the azimuth of the pedestal cannot be obtained accurately from the azimuth of the terrestrial magnetism.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a pedestal when a device for measuring various physical quantities is installed in a place where a person cannot easily access. It is an object of the present invention to provide an azimuth measuring method that allows the azimuth of the device to be obtained without any problem, and a geomagnetic azimuth measuring device that does not require a control signal line.

[0007]

According to a first aspect of the present invention, there is provided a geomagnetic azimuth measuring device for measuring the azimuth of the geomagnetism in a place where a person cannot easily approach. Means for measuring the azimuth of terrestrial magnetism, an analog / digital converter for creating digital data from these analog output signals, a memory for storing digital data of the analog / digital converter, and a digital memory for storing the digital data. It is characterized by incorporating a data transmission means for reading data into an external device and a battery for power supply integrally.

[0008] The geomagnetic azimuth measuring apparatus of the present invention is described in claim 2
As described in (1), the means for measuring the inclination is integrated, and the means for measuring the inclination can measure the inclination of the place together with the azimuth of the geomagnetism.

According to a third aspect of the present invention, there is provided a geomagnetic azimuth measuring apparatus.
As described in (1), the means for measuring the temperature is integrated, and the temperature around the measuring device can be measured by the means for measuring the temperature.

According to the present invention, there is provided a geomagnetic azimuth measuring device.
As described in (1), the means for measuring the water pressure is integrally incorporated, and the means for measuring the water pressure can measure the water pressure applied to the device.

According to a fifth aspect of the present invention, there is provided a geomagnetic azimuth measuring apparatus.
As described in (1), a scheduler is integrally incorporated, and a schedule for converting an analog signal into a digital signal and storing it in the memory is set in advance by the scheduler.

According to a sixth aspect of the present invention, there is provided a geomagnetic direction measuring apparatus.
Claim 1, Claim 2, Claim 3,
According to a fourth, fifth or sixth aspect of the present invention, the microprocessor is integrally incorporated, and the operation of the measuring device is controlled by a control signal of the microprocessor.

According to a seventh aspect of the present invention, there is provided a geomagnetic azimuth measuring apparatus.
Claim 1, Claim 2, Claim 3,
In any one of claims 4, 5 and 6, the apparatus has a function of ascending from the seabed after measuring the azimuth of a device for measuring various physical quantities.

The azimuth measuring method according to the present invention is, as described in claim 8, one of claim 1, claim 2, claim 3, claim 4, claim 5, claim 6, or claim 7. In the steps of installing a geomagnetic azimuth measuring device according to any one of (1) to (4), measuring the azimuth of terrestrial magnetism by the measuring device, and collecting the measuring device after measuring the azimuth, the analog signal by the gyrocompass is converted into a digital signal. Storing the digital data stored in the memory into the external device, and measuring the absolute azimuth of the geomagnetism at a target location with the external device based on the read data. Measuring the azimuth of terrestrial magnetism with a device for measuring various physical quantities attached with a terrestrial magnetism detection sensor at the place; A series of steps consist of comparing the azimuth of the terrestrial magnetism obtained by the terrestrial magnetism detection sensor attached to the vehicle with the absolute azimuth of the terrestrial magnetism previously obtained to determine the azimuth of the installed equipment that measures various physical quantities. It is characterized by being performed.

[0015]

According to the first aspect of the present invention, there is provided a geomagnetic azimuth measuring device according to the present invention, wherein a gyro compass, a means for measuring the azimuth of the geomagnetism, an analog / digital converter, a memory, a data transmission means, a power supply It is designed to measure the azimuth of the geomagnetism in a place that is not easily accessible by people.

According to the measuring device, since the direction obtained by the gyro compass can be used as a reference, it is possible to determine the absolute direction of geomagnetism. When installing equipment for measuring various physical quantities at the place, install the equipment with the geomagnetic detection sensor attached, and output signals of the geomagnetic detection sensor together with the output signals of the sensors for measuring various physical quantities. Is stored, and the azimuth of geomagnetism is measured. The result obtained by this measurement is compared with the absolute azimuth of the geomagnetism measured in advance by the geomagnetic azimuth measuring device according to the present invention, and the azimuth of the installed equipment for measuring various physical quantities is determined.

As described above, since the direction of the measuring device is determined based on the absolute direction of the geomagnetism, even if the direction of the geomagnetism is disturbed in a target place such as a volcanic zone, the geomagnetic direction in which the geomagnetism detection sensor is attached is provided. If it is a measuring instrument, the direction can be determined accurately. In this case, if it is necessary to know the inclination of the equipment that measures various physical quantities, use a geomagnetic azimuth measurement device that incorporates the means for measuring the inclination integrally.

With the azimuth measuring method according to the present invention, a pedestal for the measuring device is not required for installing the device for measuring various physical quantities. For this reason, the step of burying the pedestal can be omitted, and the installation of the measuring device is facilitated. Also, unlike the compass using a conventional gyro compass, the geomagnetic compass measuring device according to the present invention does not have a control signal line connected to a control device, so that the geomagnetic compass in the borehole can be measured. Measurement can be performed easily, work on the sea can be facilitated, and installation costs can be reduced.

If a scheduler is incorporated in the measuring device, a power supply battery can be scheduled to be supplied to the device only when measurement is required, and power consumption of the power supply battery can be suppressed. Measuring the azimuth of the geomagnetism at deep boreholes and the sea floor is a time-consuming task, and it is important to reduce the consumption of power batteries. In addition, when used on the sea floor, after measuring the azimuth of geomagnetism,
If the measuring device is scheduled to float, such as by cutting off the weight when the mother ship approaches, it will be easier to collect the measuring device.

On the other hand, the function of the measuring device can be enhanced by incorporating a microprocessor in the measuring device and controlling the method of processing each analog signal. For example, when the measurement device approaches a place where devices for measuring various physical quantities are to be installed, if the amplification factor of the geomagnetic detection sensor or the sampling time for digitization is changed, the accuracy of the geomagnetic azimuth measurement can be improved. improves. By installing a thermometer or the like on the measuring device and measuring the temperature around the measuring device, it is possible to correct signal disturbance due to the influence of the temperature of the gyrocompass and the geomagnetic detection sensor, thereby improving the measurement accuracy and improving the boring hole. It is convenient because information on the internal temperature can be obtained. Further, if a water pressure gauge is attached to the measuring device and the depth of the measuring device is obtained from the difference in the measured water pressure, the labor for measuring the depth can be omitted.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a vertical sectional view showing an embodiment of a geomagnetic azimuth measuring device according to one embodiment. FIG. 2 is a sectional view taken along the line II shown in FIG. FIG. 3 is a vertical sectional view showing an embodiment for determining the orientation of an instrument for measuring various physical quantities, and FIG. 4 is a II-II sectional view shown in FIG. Fig. 5 shows the configuration of the same device.

The geomagnetic azimuth measuring apparatus 1 of the present embodiment is shown in FIG.
As shown in FIG. 1, a gyro compass 10, a geomagnetic detection sensor 20, an analog / digital converter 30, and a memory 4
0, data transmission means 50, and battery 60 for power supply, and these devices 10, 20, 30, 40, 50, 60 are integrally incorporated.

The gyro compass 10 is composed of a plurality of sensors, and the plurality of sensors are arranged so as to detect an azimuth of the measuring device 1 by monitoring an output signal.

The terrestrial magnetism detection sensor 20 is arranged to detect the strength of terrestrial magnetism in two orthogonal horizontal directions and the strength of terrestrial magnetism in the vertical direction and output an analog signal proportional to the magnitude of the magnetic force. The terrestrial component force is obtained from the output value of, and its direction is detected from the magnitude of the obtained terrestrial component force.

The analog / digital converter 30 is connected to a gyrocompass or a terrestrial magnetism detection sensor, and creates digital data based on each analog output signal.

The memory 40 is connected to the analog / digital converter 30 and stores digital data from the analog / digital converter 30.

The data transmission means 50 is connected to the memory 40 and is for reading data stored in the memory 40 into an external device (not shown) arranged on the ground. It consists of electronic circuits using mediums such as, ultrasonic, infrared, and visible rays. Specifically, as shown in the embodiment of FIG. 1, data is transmitted when the measuring device 1 used in the boring hole is collected. If the data transmission means 50 is a connector, a cable is connected, and the data in the memory is transmitted to the external device via the cable. If the data transmission means 50 is another method, the data is transmitted without connecting the cable. Transmit. Here, the external device obtains the absolute azimuth of the geomagnetism based on the data read via the data transmission means 50.

The power battery 60 is a gyrocompass 1
0, a geomagnetic detection sensor 20, an analog / digital converter 30, a memory 40, and a data transmission means 50.

Next, a method for measuring the azimuth of terrestrial magnetism inside the borehole using the measuring device 1 configured as described above will be described with reference to FIGS.

First, the measuring device 1 suspended by a wire 4 at the bottom of a boring hole 3 drilled to a measuring point of a rock mass 2.
Is lowered. When the orientation of the geomagnetism is measured at the bottom of the hole, the measuring device 1 is recovered. During the period from when the measuring device 1 is started to be lowered to when it is collected, the analog signal from the gyro compass 10 and the geomagnetic detection sensor 20 is
The data is input to the analog / digital converter 30, sampled at a predetermined sampling cycle, and stored in the memory 40.

When the data transmission means 50 is a connector, the connector 5
0 is connected to a cable, and the data in the memory 40 is read into the external device. If the data transmission means uses an electromagnetic wave or the like as a medium, the data in the memory 40 is read into an external device via the electromagnetic wave or the like without connecting a cable to the measuring device 1. The external device calculates the absolute azimuth of the geomagnetism at the bottom of the borehole based on the read data.

Next, as shown in FIG. 3, a device 6 for measuring various physical quantities to which the geomagnetic detection sensor 20 is attached is installed at the bottom of the boring hole 3 formed in the rock 2. In this embodiment, after the device 6 is hardened with concrete 5, an analog signal or a digitized data from the geomagnetic detection sensor 20 attached to the device 6 is received via the signal cable 7, and the azimuth of the geomagnetism is obtained. . A device 6 that compares the azimuth of the geomagnetism with the absolute azimuth of the geomagnetism previously obtained by the measuring device 1 and measures various installed physical quantities.
Determine the direction of.

As described above, the geomagnetic azimuth measuring apparatus 1 of the present embodiment includes the gyro compass 10, the geomagnetic detection sensor 20, the analog / digital converter 30, the memory 40, the data transmission means 50, and the power supply battery 60. It is incorporated into one and is configured to measure the direction of geomagnetism at the bottom of the boring hole 3 drilled in the rock 2.
This makes it possible to measure the absolute azimuth of the geomagnetism at the bottom of the borehole, which cannot be easily accessed by humans. In addition, the measuring device 1 does not have a control signal line between an external device such as a conventional magnetic compass and a gyro compass, so that the azimuth of the geomagnetism inside the borehole can be easily measured. In addition, even in places where the azimuth of the geomagnetism is disturbed, such as in a volcanic zone, the azimuth of the instrument that measures various physical quantities using the azimuth of the geomagnetism is obtained.

FIG. 6 shows the configuration of a geomagnetic bearing measuring apparatus 1 according to another embodiment. Further scheduler 70
And by scheduling power supply to each part of the measuring device 1 for the time required for measurement,
Power consumption of the battery can be reduced.

FIG. 7 shows the configuration of a geomagnetic azimuth measuring apparatus 1 according to still another embodiment. This measuring device 1
Is a microprocessor 8 provided in the measuring device 1 shown in FIG.
0 is incorporated, and the operation content of each device 10, 20, 30, 40, 50 is controlled by the control signal of the microprocessor 80. For example, when the measuring device 1 approaches the bottom of the borehole, the number of samplings of the analog signal of the geomagnetism detection sensor 20 is increased to improve the measurement accuracy of the azimuth of the geomagnetism.

FIG. 8 is a view showing an embodiment of a geomagnetic azimuth measuring apparatus 1 according to still another embodiment. This measuring device 1 is a device to be used on the seabed, and the weight 8 is cut off when necessary by a scheduler 70, and the surface can be lifted by the action of a float 9. After measuring the absolute azimuth of the geomagnetism on the seabed, the mother ship approaches. Ascend to time. This facilitates recovery of the measuring device 1.

If a rechargeable battery is used as the power supply battery 60, the battery can be charged via the connector, and the trouble and frequency of battery replacement can be reduced. Although not shown, if a device for measuring temperature and water pressure is attached to the apparatus according to the present invention, not only the azimuth of the geomagnetic field inside the borehole but also the depth of the borehole can be determined at the same time. The temperature distribution in the borehole can be obtained.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a geomagnetic bearing measurement apparatus according to one embodiment.

FIG. 2 is a sectional view taken along the line II shown in FIG.

FIG. 3 is a vertical sectional view showing one embodiment of an azimuth measuring method.

FIG. 4 is a sectional view taken along the line II-II shown in FIG.

FIG. 5 is a configuration diagram of a geomagnetic direction measurement device.

FIG. 6 is a configuration diagram of a geomagnetic azimuth measuring device according to another embodiment.

FIG. 7 is a configuration diagram of a geomagnetic bearing measurement apparatus according to still another embodiment.

FIG. 8 is a diagram showing an embodiment of a geomagnetic azimuth measuring device according to still another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Geomagnetism measuring device 2 Rock 3 Boring hole 4 Wire 5 Cement 6 Physical quantity measuring device 7 Signal cable 8 Weight 9 Floating 10 Gyro compass 20 Geomagnetic detection sensor 30 Analog / digital converter 40 Memory 50 Connector 60 Power supply battery 70 Scheduler 80 Micro Processor

Claims (8)

[Claims] 1. A geomagnetic azimuth measuring device for measuring the azimuth of terrestrial magnetism, comprising a gyro compass, means for measuring the azimuth of terrestrial magnetism, an analog / digital converter for producing digital data from these analog output signals, A memory for storing the digital data of the analog / digital converter, data transmission means for reading the digital data stored in the memory into an external device, and a battery for power supply, which are integrally incorporated Geomagnetic azimuth measurement device characterized by: 2. The tilt measuring device according to claim 1, wherein the tilt measuring means is integrally incorporated, and the tilt measuring means can measure the azimuth of the geomagnetic field and the azimuth of the gyro compass together with the tilt of the place. Geomagnetic direction measurement device. 3. The temperature measuring device according to claim 1, wherein a means for measuring the temperature is integrally incorporated, and the temperature measuring device can measure the temperature around the measuring device. Geomagnetic direction measurement device. 4. A device according to claim 1, wherein a means for measuring the water pressure is integrated, and the means for measuring the water pressure can measure the water pressure applied to the device. Geomagnetic azimuth measuring device described in 1. 5. The scheduler according to claim 1, wherein a scheduler for converting an analog signal into a digital signal and storing the digital signal in the memory is preset by the scheduler. 3
Or a geomagnetic azimuth measuring device according to claim 4. 6. The operation of the measuring device according to claim 1, wherein a microprocessor is integrally incorporated, and an operation content of the measuring device is controlled by a control signal of the microprocessor.
The geomagnetic azimuth measuring device according to any one of claims 2, 3, 4, and 5. 7. After measuring the azimuth of geomagnetism on the sea floor,
7. The geomagnetic azimuth measuring device according to claim 1, further comprising a function of levitating. 8. A step of installing the geomagnetic azimuth measuring device according to any one of claims 1, 2, 3, 4, 5, 6, and 7, and A step of measuring the azimuth of the geomagnetism after installing the measuring device and storing it in the memory; a step of collecting the measuring device after the azimuth measurement; and a digital conversion of the analog signal by the gyro compass during these steps. Storing the digital data stored in the memory into the external device, and measuring the absolute azimuth of the geomagnetism at a target location with the external device based on the read data; At this place, the process of measuring the azimuth of the geomagnetism with a device for measuring various physical quantities equipped with a geomagnetic detection sensor and attaching it to the device for measuring various physical quantities. Compare the azimuth of geomagnetism obtained by the magnetic sensor with the absolute azimuth of geomagnetism obtained earlier,
A method for measuring the azimuth, characterized by a series of steps consisting of determining the azimuth of the installed equipment for measuring various physical quantities. [0001]