JPH11108753A - Vibration detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the power consumption of a device and to constitute the device by one signal converting means by operating only a specified vibration detecting means, the signal converting means and a connection selecting means. SOLUTION: Power is intermittently supplied to a device such that an operation control circuit 14 operates a switching device 13 and an amplification circuit 12 by a specified time T based on a signal from the output port 12 of a microcomputer. When the switching device 13 connects a sensor X9 with the amplification circuit 12 based on a signal from the output port 1 of the microcomputer, a microcomputer 15 performs A/D conversion for the A/D input of the vibration data of the sensor X9 and inputs the data. The data is corrected by the correction coefficient of the sensor X9, and abnormality determination is made as correct vibration data. If the occurrence of abnormality is determined, switching is made to a sensor next to the abnormal sensor in the order, and the vibration data is inputted as microcomputer data. The data is corrected by a correction coefficient corresponding to each sensor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration detecting device which is installed in a gas meter or the like and detects an earthquake vibration.

[0002]

2. Description of the Related Art Conventionally, a vibration detecting device of this type has been known as shown in FIG. Hereinafter, the method will be described with reference to FIG.

As shown in FIG. 14, a vibration acceleration sensor 1 for detecting vibration in the X direction, a vibration acceleration sensor 2 for detecting vibration in the Y direction, a vibration acceleration sensor 3 for detecting vibration in the Z direction, and Amplifying circuits 4, 5, 6 for amplifying the signals of the vibration acceleration sensors, a measuring circuit 7 for taking in and measuring the signals from the respective amplification circuits,
3 and amplifier circuits 4, 5, and 6, and a power supply 8 for supplying driving power to the measuring circuit 7.

[0004]

However, in the above prior art, in order to measure a phenomenon such as an earthquake which cannot be determined when it occurs, it is necessary to constantly monitor the signal of the vibration acceleration sensor, and the amplifier circuit needs to monitor the signal. Was always energized. As a result, as a power source, a commercial AC power source must be used, or a large battery must be used as a battery.
There has been a problem that miniaturization and freedom of installation are restricted.

[0005]

In order to solve the above-mentioned problems, the present invention provides a plurality of vibration detecting means, a signal converting means for converting a signal of the vibration detecting means, the vibration detecting means and the signal converting means. A connection selecting means for selecting connection with the means, and an operation control means for controlling operations of the signal converting means and the connection selecting means.

According to the above invention, only the specific vibration detecting means, the signal converting means and the connection selecting means can be operated, so that power consumption can be reduced and
It can be constituted by one signal conversion means, and downsizing and cost reduction can be realized.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention provides a plurality of vibration detecting means, a signal converting means for converting a signal of the vibration detecting means, and a connection selecting means for selecting a connection between the vibration detecting means and the signal converting means. Means, and operation control means for controlling the operations of the signal conversion means and the connection selection means. Since only the specific vibration detecting means, the signal converting means, and the connection selecting means can be operated, power consumption can be reduced, and a single signal converting means can be used. Cost reduction can be realized.

[0008] Further, the connection selecting means performs the connection by giving a priority to the connection. By assigning priorities, only specific vibrations can be monitored in a focused manner, and undetected vibrations can be prevented.

Further, the connection selecting means is provided with a priority order so that a plurality of vibration detecting means are sequentially switched and connected. Then, by switching sequentially, all can be connected evenly, and undetected vibration can be prevented.

Further, the connection selecting means is provided with a priority order so that only a predetermined vibration detecting means out of the plurality of vibration detecting means is preferentially connected. By giving priority to the predetermined vibration detecting means, only specific vibrations can be monitored in a focused manner, and non-detection of vibrations can be prevented.

Further, the connection selecting means is provided with a priority so that only two vibration detecting means out of the plurality of vibration detecting means are connected with priority. Then, priority can be given to the two directions in which the vibration occurs well, and the non-detection of the vibration can be prevented.

[0012] Further, there is provided a vibration correcting means for correcting vibration corresponding to the vibration detecting means selected by the connection selecting means. Then, even when the vibration detecting means is of a different type or has different sensitivities, the vibration is detected while correcting, so that highly accurate measurement can be performed.

[0013] Further, an abnormality monitoring means for monitoring whether or not the signal of the vibration detection means is abnormal, and a specific vibration detection means connected by the connection selection means until the abnormality monitoring means detects an abnormality. By connecting a specific vibration detecting unit until an abnormality is detected, it is possible to prevent the vibration from being undetected.

An abnormality monitoring means for monitoring whether a signal from the vibration detecting means is abnormal, and a specific vibration detecting means connected by the connection selecting means after the abnormality monitoring means detects the abnormality. . Then, after detecting the abnormality, the specific vibration detecting means is connected by the connection selecting means, whereby the abnormal vibration can be detected with higher accuracy.

After the abnormality monitoring means detects the abnormality, the specific vibration detecting means is connected by the connection selecting means,
There is provided a vector synthesizing means for synthesizing a vector of the signal of the connected vibration detecting means. Then, by performing vector synthesis of the signals of the vibration detecting means, the true magnitude of the vibration can be detected, and the abnormality can be detected with higher accuracy.

Further, there is provided an earthquake judging means for judging whether or not there is an earthquake from the signal of the vector synthesizing means. The provision of the earthquake determination means makes it possible to determine the earthquake from the vibration signal.

Further, there are provided three vibration detecting means having a main sensitivity of vibration in three orthogonal directions, and connection selecting means for sequentially switching connection between the vibration detecting means and one signal converting means. Then, by detecting vibrations in three orthogonal directions, the vibrations can be detected no matter which direction the vibration detecting means is installed.

Further, a connection selecting means for sequentially switching the connection of two of the three vibration detecting means having the main sensitivity of vibration in the horizontal direction with priority is provided. And
By detecting the two horizontal vibrations, the seismic motion can be detected efficiently.

Further, a battery is used as a power source. By using a battery as a power source, installation in a place without a power source becomes possible, and the degree of freedom of installation can be improved.

Further, there are provided attitude detecting means for detecting the installation direction of the vibration detecting means, and connection selecting means for selecting the vibration detecting means which has priority according to the signal of the attitude detecting means. Then, by detecting the posture, it is possible to use the vibration detecting means installed in the direction most suitable for the detection.

Further, the attitude detecting means is configured to detect the attitude from the signal of the vibration detecting means. Then, by detecting the posture based on the signal of the vibration detecting means, it is not necessary to newly provide a detecting means, and the size and cost can be reduced.

[0022]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a block diagram of a vibration detecting apparatus according to Embodiment 1 of the present invention. In FIG. 1, 9 is X
A sensor X as vibration detecting means for detecting vibration in the direction;
10 is a sensor Y as vibration detecting means for detecting vibration in the Y direction, 11 is a sensor Z as vibration detecting means for detecting vibration in the Z direction, 12 is an amplifier circuit as signal converting means for amplifying a signal of the sensor, Reference numeral 13 denotes a switch for sequentially switching the sensor X, sensor Y, and sensor Z and connects to the amplifier circuit 12, reference numeral 14 denotes an operation control circuit as operation control means for controlling operations of the switch 13 and the amplifier circuit 12, and reference numeral 15 denotes operation control. It is a microcomputer that controls the means. Then, the microcomputer 15 performs a correction process as a vibration correction unit that corrects the signal of the sensor by an internal software process, an abnormality monitoring process as an abnormality monitoring unit that determines an abnormality from the sensor signal, and a sensor X and a sensor Y. Vector synthesis processing for vector synthesis of the signal of the sensor Z and earthquake determination processing as earthquake determination means for determining whether the signal data after vector synthesis is an earthquake are performed. Here, reference numeral 16 denotes a battery used as a power supply, and the sensor X9, the sensor Y10, and the sensor Z11 are installed in directions orthogonal to each other. The X direction and the Y direction are horizontal, and the Z direction is a vertical direction. I do.

Next, the operation and operation will be described with reference to FIGS. As shown in FIG. 2, in the vibration detecting device of the present invention, the operation control circuit 14 causes the switch 13 and the amplifier circuit 12 to operate for a predetermined time T in response to a signal from the output port 2 of the microcomputer.
(For example, power is supplied intermittently so as to be able to operate at intervals of, for example, 100 ms). Then, the switch 13 switches the sensor X9 and the amplifier circuit 1 according to a signal from the output port 1 of the microcomputer.
When the microcomputer 2 is connected, the microcomputer 15 performs A / D conversion of the vibration data of the sensor X9 from the A / D input and inputs the data. Then, the data is corrected by the correction coefficient of the sensor X9, and abnormality is determined as correct vibration data. If there is no abnormality, the power of the switch 13 and the power of the amplifier circuit 12 are turned off. Then, it waits for an interval of the predetermined time T again, and when the time comes, supplies power so that the switch 13 and the amplifier circuit 12 can operate again. At this time, the sensor Y10 and the amplifier circuit 12 are connected, and if there is no abnormality, the measurement is repeatedly performed by sequentially switching to the sensor X11 and the sensor X9.

If it is determined that an abnormality has occurred, if an abnormality occurs in the sensor next to the sensor in which the abnormality has occurred, for example, the sensor Y10, the order of the sensor Z11, the sensor X9, and the sensor Y10 And the vibration data is input as microcomputer data. The data is corrected by a correction coefficient corresponding to each sensor. When the measurement in three directions is completed, the power supply to the switch 13 and the amplifier circuit 12 is stopped, and the apparatus waits for an interval of a predetermined time T. Then, when the time comes, power is supplied so that the switch 13 and the amplifier circuit 12 can be operated again, and a predetermined number of pieces of vibration data are input. Then, it is determined whether or not there is an abnormality in the earthquake based on a data string value obtained by vector-combining the vibration data in the three directions. If there is no abnormality, the process returns to the standby state in the initial measurement cycle T. If it is determined that the abnormality is abnormal, processing for the abnormality, for example, generation of an alarm sound, etc., is performed, and the process stands by until the abnormality is cleared.

FIGS. 4 and 5 show timing charts. Here, the switching measurement cycle T is 100 ms, and the measurement time ΔT for turning on the power is 10 ms. By measuring at this time interval, the measurement can be performed without missing the 1 Hz band which is the main frequency component of the earthquake. After the abnormality is detected, the three sensors are measured for approximately Δ
By switching every 10 milliseconds of T and measuring at the measurement cycle T, it is possible to simulate the simultaneous measurement of vibrations in three directions.

As described above, by monitoring vibration abnormalities with a single sensor and pseudo-monitoring vibrations in three directions, power consumption can be reduced to approximately 1/3 and one sensor can be used. It can be constituted by an amplifier circuit, and downsizing and cost reduction can be realized. Also, by prioritizing and sequentially switching and connecting, vibrations in all directions can be equally connected, and undetected vibrations can be prevented. Furthermore, even if the sensors are of different types in each direction or have different sensitivities, the vibration can be corrected and measured by the vibration correction processing, so that highly accurate vibration detection can be performed. By switching and connecting the sensors in three directions in a short time until an abnormality is detected, it is possible to prevent non-detection of vibration. Further, after detecting an abnormality, three-way sensors are connected by a switch to perform vector synthesis, so that abnormal vibration can be detected with higher accuracy. Furthermore, by providing an earthquake determination means, an earthquake can be determined from the vibration signal. Further, since the sensors in the three directions have main vibration sensitivity in directions orthogonal to each other, the vibration can be detected regardless of the direction in which the sensors are installed. By using a battery as a power source, installation in a place without a power source becomes possible, and the degree of freedom of installation can be improved.

(Embodiment 2) FIG. 6 is a flowchart showing a vibration detecting apparatus according to Embodiment 2 of the present invention. Here, the same components as those in the first embodiment are denoted by the same reference numerals. The difference from the first embodiment is that the sensor X9 and the sensor Y1 in which the priority sensor is set in the horizontal direction until an abnormality is detected.
It has been set to 0. Here, the arrangement of the sensor X9 and the sensor Y10 is such that their main axis directions intersect at 90 °. The configuration is the same as that of FIG. 1, and a timing chart showing the operation is shown in FIG.

Next, the operation and operation will be described. As shown in FIG. 6, at a predetermined time T, the operation control circuit 14
3 and the power supply so that the amplifier circuit 12 can operate.
Then, the switch 13 connects the sensor X9 to the amplifier circuit 12, and the microcomputer 15 converts the vibration data of the sensor X9 into an A / D signal.
Convert and input. Then, the data is corrected by the correction coefficient of the sensor X9, and it is determined whether an abnormality has occurred. If there is no abnormality, the power of the switch 13 and the power of the amplifier circuit 12 are turned off. Then, it waits again at an interval of a predetermined time T, and when the time comes, supplies power so that the switch 13 and the amplifier circuit 12 can operate again. At this time, the sensor Y1
0 is connected to the amplifier circuit 12, and if there is no abnormality, the measurement is performed by sequentially switching the two sensors of the sensor X9 and the sensor Y10.

When it is determined that an abnormality has occurred, a predetermined number of pieces of vibration data are input from the three-directional sensors and the vector value sequence is formed in accordance with the flowchart shown in FIG. Then, it is determined from the vector value sequence whether or not there is an abnormality of the earthquake. If there is no abnormality, the process returns to the standby state of the initial measurement cycle T. If it is determined to be abnormal, processing for the abnormality, for example, generation of an alarm sound, etc., is performed, and the process stands by until the abnormality is cleared.

As described above, during normal monitoring, by giving priority to connection only in two horizontal directions, priority can be given to two directions in which seismic motion often occurs, thereby preventing undetected vibration. Can be.

(Embodiment 3) FIG. 8 is a flowchart showing a vibration detecting apparatus according to Embodiment 3 of the present invention. Here, the same components as those in the first embodiment are denoted by the same reference numerals. The difference from the first embodiment is that only two sensors as vibration detecting means are installed in the sensor X9 and the sensor Y10 in the horizontal direction. Then, after detecting an abnormality, two directions of the sensor X9 and the sensor Y10 are switched and connected, a vibration vector from the two directions is obtained, and it is determined whether or not an earthquake has occurred.
This is for performing an abnormality determination. Here, the arrangement of the sensor X9 and the sensor Y10 is such that their main axis directions intersect at 90 °. The configuration is the same as that of FIG. 1 except that the sensor Z is removed, and FIG. 9 is a timing chart showing the operation.

Next, the operation and operation will be described. As shown in FIG. 8, when it is determined that an abnormality has occurred, the sensor in the next order to the sensor in which the abnormality has occurred, for example, the sensor Y
If an abnormality occurs at 10, switch to sensor X9, and again switch to sensor Y10 and sensor X9 in that order,
A predetermined number of vibration data is input as microcomputer data. The data is corrected by a correction coefficient corresponding to each sensor. When the measurement in the two directions is completed, the power supply to the switch and the amplifier circuit is stopped. Then, a vector synthesis process is performed from the two vibration data sequences to obtain a vector value sequence. Based on the vector value sequence, it is determined whether or not the earthquake is abnormal, and if there is no abnormality, the process returns to the standby state in the initial measurement cycle T. If it is determined to be abnormal, processing for the abnormality,
For example, an alarm sound is generated, and the apparatus stands by until the abnormality is cleared.

As described above, when an abnormality can be detected by measuring horizontal vibration such as an earthquake, two vibration detecting means can be used, and the apparatus can be reduced in size and cost. I can do it.

(Embodiment 4) FIG. 10 is a block diagram showing a vibration detecting means of a vibration detecting apparatus according to Embodiment 4 of the present invention. The difference from the first embodiment is that a posture detection process as posture detection means is provided by using a capacitance type vibration sensor 17 as shown in FIG. Here, the posture detection processing is performed using the DC output of the capacitance type vibration sensor 17, and the capacitance type vibration sensor 17 is affected by gravity even when the vibration is zero, Since the gap 20 between the fixed portion 18 and the fixed portion 19 is deformed, the capacitance change at that time is converted into a distortion amount by the C / V circuit 21 as a signal converting means.
C output. The three capacitance-type vibration sensors 17 are installed in directions in which their main sensitivity directions are orthogonal to each other. In FIG.
4 shows output characteristics of the capacitance type vibration sensor 17. When the main sensitivity direction of the sensor is in the horizontal direction, the output is V / 2 as an offset output, and when the sensor is in the upward direction,
If the output is V / 2 + Vg, downward, the output is V /
There is an output of 2-Vg.

Next, the operation and operation will be described. FIG.
As shown in (1), the DC output is measured by sequentially switching the order of the sensor X, the sensor Y, and the sensor Z. Based on the DC output, an orientation inclination angle calculation process is performed as orientation detection means in which direction the sensor is installed. Then, a sensor that does not generate an output due to gravity is used. This is because the case where the output is not generated and the offset voltage remains as it is is most suitable for vibration detection since the widest measurement voltage range can be obtained. For example, as shown in FIG. 13, the output of the sensor X and the sensor Y is V / 2, and the output of the sensor Z is V / 2 +
In the case of Vg, it is determined that the sensor Z is installed in the vertical direction, and the outputs of the sensors X and Y are preferentially selected so as to be used as data of the vibration detection processing. Sensor Z
Is because V / 2 + Vg is generated in the output, so that the voltage range in the plus direction only measures the remaining voltage range of V / 2−Vg. If the detection sensors can be prioritized, abnormality detection is performed by a process using two sensors, as described in the third embodiment below.

As described above, by using the posture detecting means, it is possible to determine which sensor should be used, and it is possible to use the vibration detecting means provided in the direction most suitable for the detection. Also, by using the same as the vibration sensor, it is not necessary to newly provide a detecting unit, and the size and cost can be reduced.

[0038]

As is apparent from the above description, the vibration detecting device of the present invention has the following effects.

The signal converting means for converting the signals of the plurality of vibration detecting means and the connection selecting means for selecting the connection between the vibration detecting means, and the operation controlling means for controlling the operations of the signal converting means and the connection selecting means. With this configuration, only the specific vibration detection unit, the signal conversion unit, and the connection selection unit can be operated. Therefore, power consumption can be reduced, and a single signal conversion unit can be used. And cost reduction can be realized.

Further, by setting priorities for connection, only specific vibrations can be monitored in a focused manner, and undetected vibrations can be prevented.

Further, by setting the priorities so that a plurality of vibration detecting means are sequentially switched and connected, all of them can be connected evenly, and the non-detection of vibration can be prevented.

Further, by setting a priority order so that only predetermined vibration detecting means among a plurality of vibration detecting means are connected with priority, it is possible to monitor only specific vibrations. In addition, it is possible to prevent undetected vibration.

Further, by setting a priority order so that only two vibration detection means of the plurality of vibration detection means are connected with priority, the priority is given to two directions in which vibration occurs well. It is possible to prevent undetected vibration.

In addition, by providing a vibration correcting means for correcting vibration corresponding to the vibration detecting means selected by the connection selecting means, when the vibration detecting means is of a different type,
Even when the sensitivities are different, the vibration is detected while correcting, so that highly accurate measurement can be performed.

Further, by connecting specific vibration detecting means until an abnormality is detected, it is possible to prevent non-detection of vibration.

Further, after detecting the abnormality, the specific vibration detecting means is connected by the connection selecting means, so that the abnormal vibration can be detected with higher accuracy.

Further, after detecting the abnormality, the true magnitude of the vibration can be detected by performing the vector synthesis of the signals of the vibration detecting means, so that the abnormality can be detected more accurately.

Further, the provision of the earthquake judging means makes it possible to judge the earthquake from the vibration signal.

Further, by detecting vibrations in three orthogonal directions, the vibrations can be detected no matter which direction the vibration detecting means is installed.

Further, seismic motion can be detected efficiently by detecting two horizontal vibrations.

Further, by using a battery as a power source, it is possible to install the device in a place where there is no power source, and the degree of freedom of installation can be improved.

Further, by providing an attitude detecting means for detecting an installation direction of the vibration detecting means and a connection selecting means for selecting a vibration detecting means which has priority according to a signal of the attitude detecting means, the apparatus can be installed in a direction most suitable for detection. The used vibration detecting means can be used.

Further, by detecting the posture by the signal of the vibration detecting means, it is not necessary to newly provide a detecting means, and the size and cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram of a vibration detection device according to a first embodiment of the present invention.

FIG. 2 is a flowchart showing the operation of the vibration detection device.

FIG. 3 is a flowchart showing another operation of the vibration detection device.

FIG. 4 is a timing chart showing the operation of the vibration detection device.

FIG. 5 is a timing chart showing another operation of the vibration detection device.

FIG. 6 is a flowchart illustrating an operation of the vibration detection device according to the second embodiment of the present invention.

FIG. 7 is a timing chart showing the operation of the vibration detection device.

FIG. 8 is a flowchart illustrating an operation of the vibration detection device according to the third embodiment of the present invention.

FIG. 9 is a timing chart showing the operation of the vibration detection device.

FIG. 10 is a configuration diagram of a vibration detection unit according to a fourth embodiment of the present invention.

FIG. 11 is a characteristic diagram of the vibration detection device.

FIG. 12 is a flowchart showing the operation of the vibration detection device.

FIG. 13 is a characteristic diagram of the vibration detection device.

FIG. 14 is a configuration diagram showing a conventional vibration detection device.

[Explanation of symbols]

 Reference Signs List 9 sensor X (vibration detecting means) 10 sensor Y (vibration detecting means) 11 sensor Z (vibration detecting means) 12 amplifier circuit (signal converting means) 13 switcher (connection selecting means) 14 operation controlling means (operation controlling means) 16 Battery (power supply means) 17 Capacitance type vibration sensor (vibration detection means) 21 C / V circuit (signal conversion means)

Claims (15)

[Claims] A plurality of vibration detecting means; a signal converting means for converting a signal of the vibration detecting means; a connection selecting means for selecting a connection between the vibration detecting means and the signal converting means; A vibration detection device comprising: a control unit for controlling the operation of the connection selecting unit. 2. The vibration detecting device according to claim 1, wherein the connection selecting means performs the connection by giving a priority to the connection. 3. The vibration detecting device according to claim 2, wherein the connection selecting means sets the priority so that the plurality of vibration detecting means are sequentially switched and connected. 4. The vibration detecting device according to claim 2, wherein the connection selecting means sets the priority so that only a predetermined vibration detecting means out of the plurality of vibration detecting means is connected with priority. 5. The vibration detecting apparatus according to claim 4, wherein the connection selecting means sets the priority so that only two of the plurality of vibration detecting means are connected with priority. 6. The vibration detecting device according to claim 1, further comprising vibration correcting means for correcting a vibration signal corresponding to the vibration detecting means selected by the connection selecting means. 7. An abnormality monitoring means for monitoring whether a signal from the vibration detection means is abnormal, and a specific vibration detection means connected by a connection selecting means until the abnormality monitoring means detects an abnormality. The vibration detecting device according to any one of the above. 8. An abnormality monitoring means for monitoring whether a signal from the vibration detection means is abnormal or not, and after the abnormality monitoring means detects an abnormality, a specific vibration detection means is connected by a connection selection means. 7. The vibration detection device according to any one of claims 1 to 6. 9. The apparatus according to claim 1, further comprising a vector synthesizing means for connecting a specific vibration detecting means by the connection selecting means and synthesizing a vector of the signal of the connected vibration detecting means after the abnormality monitoring means detects the abnormality. 9. The vibration detecting device according to 8. 10. The vibration detecting apparatus according to claim 9, further comprising an earthquake judging means for judging whether or not there is an earthquake from a signal of the vector synthesizing means. 11. A system comprising: three vibration detecting means having main sensitivities of vibration in three orthogonal directions; and connection selecting means for sequentially switching connection between the vibration detecting means and one signal converting means. 11. The vibration detecting device according to any one of 1 to 10. 12. A device according to claim 1, further comprising a connection selecting means for sequentially switching two of the three vibration detecting means having the main sensitivity of vibration in the horizontal direction with priority given to connection.
The vibration detecting device according to claim 1. 13. A battery as a power source means.
The vibration detecting device according to any one of the above. 14. An apparatus according to claim 1, further comprising an attitude detecting means for detecting an installation direction of the vibration detecting means, and a connection selecting means for selecting a priority of the vibration detecting means based on a signal from the attitude detecting means. The vibration detecting device as described in the above. 15. The vibration detecting device according to claim 14, wherein the posture detecting means detects the posture from a signal of the vibration detecting means.