JP4427911B2 - Seismograph - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vibration detection apparatus that is installed in a gas meter or the like and detects earthquake vibration.
[0002]
[Prior art]
Conventionally, this type of vibration detection apparatus is known as disclosed in Japanese Patent Application Laid-Open No. 2000-206263. The method will be described below with reference to FIG.
[0003]
As shown in FIG. 7, acceleration sensors 1, 2, and 3 that output analog signals in response to earthquake vibration, acceleration sensor drive circuits 4, 5, and 6, noise removal filters 7, 8, and 9, The configuration provided with the microcomputer 10. Here, 11 is a reset switch, 12 is an SI presence / absence switch, 13 is an operation start setting device, 14 is a reference setting device, 15 is a charger, 16 is a power switch, 17 is a photocoupler, 18 is a display, 19 is a display The machine drive circuit 20 is a measurement reset.
[0004]
[Problems to be solved by the invention]
However, in the above-described conventional configuration, the measured seismic intensity is detected by the calculation process by the microcomputer by the method of calculating the measured seismic intensity according to the seismic intensity calculating procedure shown in FIG. This method requires high-speed arithmetic processing such as Fourier transform, and consumes a large amount of current, so that it is difficult to operate with a battery for a long time. Therefore, there has been a problem that the battery must be used while being sequentially charged using a charger. An object of the present invention is to provide a seismic device that can operate for a long period of time with low power consumption by means of filter means, time integration means, and time determination means.
[0005]
[Means for Solving the Problems]
In order to solve the above-described conventional problems, the seismic sensor according to the present invention includes a vibration detection unit that detects seismic motion and the like, a filter unit that realizes a filter characteristic of measured seismic intensity, and an output signal of the vibration detection unit. A time integrating means for integrating the time when the signal filtered by the means is equal to or higher than a predetermined level, and a time determining means for determining whether the integrated time accumulated by the time integrating means is equal to or longer than a predetermined time. is there.
[0006]
This makes it possible to detect the seismic intensity determined by the Japan Meteorological Agency using the filter means without using Fourier transform, and the seismic intensity can be detected without using a high-speed processing microcomputer, so that it can be operated with low power consumption.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
The invention according to claim 1 is provided with a plurality of vibration detecting means for detecting seismic motion and the like, and an output signal filter provided corresponding to the plurality of vibration detecting means and indicating a measured seismic intensity detected by the vibration detecting means. A plurality of filter means for realizing the characteristics, a time integrating means for integrating the time when a signal obtained by filtering the output signal of the vibration detecting means by the filter means exceeds a predetermined level, and an integrated time accumulated by the time integrating means Time determining means for determining whether or not a predetermined time or more, level determining means for determining whether or not each of the signals obtained by filtering the output signal of the vibration detecting means by the filter means exceeds a predetermined level, and Output determination means for determining whether or not the output of the level determination means has changed, wherein the output determination means causes the level determination means to output the output signal of the vibration detection means. If one or more of the filtered signal by filter means is determined to have exceeded a predetermined level, by operating the time determination means and said time integrating means, prescribed by the Japan Meteorological Agency filter means without using the Fourier transform measurement The seismic intensity can be detected and a simple method of integrating and discriminating time can be performed, so that the measured seismic intensity can be detected without using a high-speed processing microcomputer, so that it can be operated with low power consumption.
[0008]
According to a second aspect of the present invention, the vibration detection means comprises a three-dimensional vibration detection means arranged so that vibration in a three-dimensional direction can be detected using a piezoelectric vibration acceleration detection means. By using the piezoelectric vibration acceleration detecting means, the vibrator itself generates power, so that amplification can be minimized and low power consumption can be achieved.
[0009]
According to a third aspect of the present invention, the filter means includes at least one or more stages of a high-pass filter circuit having a first cutoff frequency and a low-pass filter circuit having a second cutoff frequency. A filter can be realized by combining filter circuits, and the seismic intensity determined by the Japan Meteorological Agency can be detected by the filter means without using Fourier transform.
[0010]
The invention according to claim 4 includes time discriminating means for discriminating a plurality of levels of measured seismic intensity by providing time accumulating means for accumulating the time when the filtered signal exceeds a plurality of predetermined levels for each predetermined level. Thus, by limiting the number of the determination levels and the predetermined level, the operation is performed only when necessary to detect the accumulated time and the like, so that the power consumption can be reduced.
[0014]
According to the fifth aspect of the present invention, the vibration detecting means, the filter means, the time integrating means, and the time discriminating means are driven by a battery, and the power source is a battery, so that no power supply work is required, and it can be used outdoors without a power source. It can be used even when the supply of commercial power to the lifeline is closed.
[0015]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
[0016]
FIG. 1 is a block diagram showing a seismic device according to Embodiment 1 of the present invention. In FIG. 1, 21 is a piezoelectric vibration sensor as a vibration detecting means for detecting vibration acceleration in three directions, 22 is a filter characteristic of measured seismic intensity determined by the Japan Meteorological Agency (reference document; Gazette No. 1831, Meteorological Agency announcement No. 4 weather) A filter circuit as a filter means that reproduces the business law enforcement regulations), 23 a level determination means for detecting a signal obtained by filtering a part of the output signal of the vibration sensor 10 by the filter circuit 22, and 24 an output. Determining means, 25 is an A / D converter, 26 is a synthesizing means for vector synthesis of the output signals of the three A / D converters, and 27 is a time integration for integrating time when the synthesized signal waveform is above a predetermined level. Means 28 is a time discriminating means for judging whether or not the accumulated time is a predetermined time or more, and 29 is an earthquake discriminating which discriminates the measured seismic intensity according to the conditions discriminated by the time discriminating means Stage, 30 signal receiving trigger inputs output determining unit 31 performs the above processing microcomputer 32 is a battery for supplying electric power to these means. Here, 33 is an amplifier for signal amplification of the vibration sensor, 34 is a vibration sensor device in which the vibration sensor 10 and the amplifier 14 are integrated, and 35 is a notification means for notifying an earthquake when the measured seismic intensity is abnormal. The filter circuit 22 includes a high-pass filter circuit 36, a first low-pass filter circuit 37, and a second low-pass filter circuit 38 as shown in FIG.
[0017]
Next, operation | movement and an effect | action are demonstrated using FIGS. 3-6. The measured seismic intensity is obtained by the procedure of the flowchart shown in FIG. First, a filter process is performed that performs predetermined weighting on the frequency axis on vibration acceleration signals in three directions of east-west, north-south, and up-down detected by the vibration sensor 21. Then, in order to consider the duration from the signal obtained by vector synthesis of the filtered three-way components, the acceleration level that lasts for 0.3 seconds or more is obtained, and the measured seismic intensity is obtained by substituting it into a predetermined equation. is there. Here, in order to perform the Fourier transform, a signal processor is usually used, but in order to operate with a battery for a long period of time, filter processing is realized with a filter circuit, and the measured seismic intensity is approximately detected. .
[0018]
First, the signal of the vibration sensor is filtered by a filter circuit by connecting three filter circuits 22 as shown in FIG. 4, that is, a high-pass filter, a first low-pass filter, and a second low-pass filter in series. Thus, the weighting of the bandpass filter characteristic with the gain A as a peak as shown in FIG. 5 is performed. And the level discrimination | determination means 23 which discriminate | determines whether the signal which passed the filter circuit 22 is a predetermined level was provided in the output stage of each filter. When it is determined that at least one of the three level determination means 23 has exceeded a predetermined level, the output determination means 24 outputs a trigger signal to the microcomputer 31. In response to this signal, the microcomputer 31 performs A / D conversion on the three signals that have passed through the filter circuit and inputs them, and the combining means 26 performs a vector combining processing operation. For example, the predetermined level is set at 80 cm / s ² between 25 and 100 cm / s ² . Since the microcomputer 31 does not have to operate until this level is exceeded, the power consumption of the battery can be suppressed.
[0019]
After the trigger signal is input, the microcomputer 31 performs the following process as shown in FIG. That is, the time integration means 27 integrates the time during which the vector synthesized signal is equal to or higher than a predetermined level. For example, in order to detect the measured seismic intensity I1 = 5, a0 is calculated backward from the formula I = 2 · Log (a0) + K to obtain a0 = 107 cm / s ² , and the predetermined level is set to 107. Then, the measured seismic intensity 5 is discriminated by the time discriminating means 28 for detecting whether or not the duration of the vector synthesized signal is not less than a predetermined level (for example, 107) is 0.3 seconds or more. Here, K uses a correction coefficient of 0.94. Similarly, in the case of the measured seismic intensity I2 = 6, the measured seismic intensity 6 can be determined by accumulating the signal times of a1 = 339 cm / s ² or more and determining whether or not it is 0.3 seconds or more. The seismic intensity can be determined in two stages of seismic intensity 5 and 6.
[0020]
When the measured seismic intensity is 5, processing of the notification 1, for example, an abnormal display notification is performed. Further, when the measured seismic intensity is 6 or more, the notification 2 is processed, for example, a notification is sounded. As described above, since the process can be changed depending on the measured seismic intensity, there is an effect that can be applied to various cases.
[0021]
In this way, by detecting the measured seismic intensity by limiting to a specific measured seismic intensity using the time integrating means and the time discriminating means, the level of the earthquake can be detected in a plurality of stages with low power consumption. In addition, measurement seismic intensity determined by the Japan Meteorological Agency can be accurately detected by filter means without using Fourier transform, and it can be performed by a simple method of integrating and discriminating time, so measurement seismic intensity can be detected without using a high-speed processing microcomputer. Therefore, it can be operated with low power consumption. Then, by using the piezoelectric vibration acceleration detecting means, the vibrator itself generates power, so that amplification can be minimized and low power consumption can be achieved. A filter is realized by combining each filter circuit, and the seismic intensity measured by the Japan Meteorological Agency can be detected by the filter means without using Fourier transform. Further, by limiting the number to a predetermined level, the operation is performed only when necessary, and the accumulated time and the like are detected, so that the determination can be made with low power consumption. Then, by discriminating the filtered signal with the level determining means, it is possible to determine whether or not there is a low level of vibration without operating the microcomputer, so that low power consumption can be achieved. If the low-level vibration set in one direction is detected among the vibrations in the three-dimensional direction, the time accumulating unit operates, so that detection that does not miss the earthquake can be performed. And after a level determination means, it can be made low power consumption by operating each means. By using a battery as the power source, power supply work is not required, and it can be used outdoors without a power source, and can be used even when the supply of commercial power to the lifeline is closed.
[0022]
Although three-dimensional vibration detection is in the east-west, north-south, and up-down directions, it is not always necessary to install in that direction. Since the three vibration sensors are orthogonal to each other, it is obvious that an equivalent signal can be obtained by vector synthesis of signals in the three directions regardless of the direction. The piezoelectric vibration detecting means has been described, but if low power consumption is advanced, the same effect can be obtained even in the capacitance type and the strain resistance type. Furthermore, as explained in the measurement seismic intensities 5 and 6, it is desirable to change the set values in a timely manner according to the place, equipment, system, etc. to be used. Moreover, when using it for the security management of gas supply equipment, it is possible to set not only a notification but also a gas flow meter, a gas shut-off valve, or the like to shut off the gas according to the gas flow rate in a plurality of stages. Further, although the level determination means 23 has been described, the multistage detection of the measured seismic intensity can be realized without the level determination means if the integrated time is always detected by a microcomputer and predetermined processing is performed.
[0023]
【The invention's effect】
As described above, according to the seismic device of the present invention, the following effects can be obtained.
[0024]
The present invention integrates vibration detection means for detecting seismic motion and the like, filter means for realizing a filter characteristic of measured seismic intensity, and a time when a signal obtained by filtering the output signal of the vibration detection means by the filter means is equal to or higher than a predetermined level. And a time discriminating means determined by the Japan Meteorological Agency without using a Fourier transform. Can be detected by a simple method of integrating and discriminating time, so that the measured seismic intensity can be detected without using a high-speed processing microcomputer, so that it can be operated with low power consumption.
[Brief description of the drawings]
FIG. 1 is a block diagram of a seismic device according to a first embodiment of the present invention. FIG. 2 is a block diagram showing filter means of the seismic device. FIG. 3 is a flowchart for obtaining a measured seismic intensity. Fig. 5 is a characteristic diagram showing characteristics of the filter circuit of the seismic device. Fig. 6 is a flowchart showing processing of the seismic device. Fig. 7 is a block diagram showing a conventional seismic device. Explanation】
21 Vibration sensor (vibration detection means)
22 Filter circuit (filter means)
23 level judging means 24 output judging means 27 time integrating means 28 time judging means 32 battery 36 high pass filter circuit (filter means)
37 First low-pass filter circuit (filter means)
38 Second low-pass filter circuit (filter means)

Claims (5)

A plurality of vibration detection means for detecting earthquake motion,
A plurality of filter means provided corresponding to the plurality of vibration detection means, and realizing a filter characteristic of an output signal indicating a measured seismic intensity detected by the vibration detection means ;
A time integration unit that integrates a time during which a signal obtained by filtering the output signal of the vibration detection unit by the filter unit is equal to or higher than a predetermined level;
Time discriminating means for judging whether or not the accumulated time accumulated by the time integrating means is a predetermined time or more ;
Level determination means for determining whether or not each of the signals obtained by filtering the output signal of the vibration detection means by the filter means exceeds a predetermined level;
Output determination means for determining whether or not the output of the level determination means has changed,
When the output determining means determines that one or more of the signals obtained by filtering the output signal of the vibration detecting means by the filter means exceeds a predetermined level, the time integrating means and the time determining means A seismic device that works.   2. The seismic sensor according to claim 1, wherein the vibration detection means comprises three-dimensional vibration detection means arranged so that vibration in a three-dimensional direction can be detected using a piezoelectric vibration acceleration detection means.   2. The seismic sensor according to claim 1, wherein the filter means comprises at least one stage of a high-pass filter circuit having a first cutoff frequency and a low-pass filter circuit having a second cutoff frequency.   2. A seismic instrument according to claim 1, further comprising time discriminating means for discriminating a plurality of levels of measured seismic intensity by providing time accumulating means for accumulating the time when the filtered signal exceeds a plurality of predetermined levels for each predetermined level. . The vibration detector according to any one of claims 1 to 4, wherein the vibration detection means, the filter means, the time integration means, and the time determination means are driven by a battery.

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