JPH09236483A - Seismometer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect earthquake by being disposed on a gas meter, etc. SOLUTION: A seismometer comprises a first ultrasonic wave receiving/ sending apparatus 10 and a second ultrasonic wave receiving/sending apparatus 11 both being inclined with respect to a center axis 9a of a gas fluid pipe passage 9. There are further provided first signal processing means wherein a reflected wave from a first vibration plate 12 constituting a free vibration device 14 is received by the first ultrasonic wave receiving/sending apparatus 10, and which converts ultrasonic wave generation information and ultrasonic wave reception information to a displacement as vibration information of the first free vibration device 14, and judgement means for judging whether or not the vibration information indicates earthquake.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic device installed in a gas meter, a gas shutoff device or the like to detect an earthquake.

[0002]

2. Description of the Related Art Conventionally, this kind of seismic device is disclosed in
No. 48634 has been known. Less than,
The configuration will be described with reference to FIG.

As shown in FIG. 3, a sphere 3 is rotatably housed in a box body 2 whose bottom surface 1 has a concave conical shape, and is vertically slidably held by an inner lid 4 of the box body. The lower surface of the disk 5 is brought into contact with the upper surface of the sphere 3 by the weight of the disk 5, the plunger 6 provided on the upper surface of the disk 5 is brought into contact with the switch mechanism 7, and the disk 5 is moved upward to cause the switch mechanism. 7 works.

In the above structure, when the box 2 vibrates, the sphere 3 rolls on the conical bottom surface 1 from the center to the end. At this time, since the distance between the bottom surface 1 and the concave spherical surface of the disk 5 is small at the position closer to the end from the center, the plunger 6 is pushed up by the sphere 3 entering this distance and the contact 8 is turned on.

[0005]

However, although the above-mentioned prior art can detect a vibration, it has not been known what magnitude the vibration is. Moreover, it was possible to limit the magnitude of the vibration that the contact was turned on by the inclination angle of the conical bottom surface, but it was not accurate. Then, there was a problem that the timing of turning on the contact did not match the vibration waveform, and it was difficult to distinguish the seismic movement and the impact movement.

The present invention is intended to solve the above problems, and its main purpose is to accurately measure an earthquake by measuring the movement of a free oscillator by sound waves and obtaining vibration information.

[0007]

In the seismic sensing device of the present invention, a sound wave generating means for generating a sound wave, a free vibration element provided substantially in front of the sound wave generating means, and reflected from the free vibration element. Sound wave receiving means for receiving a sound wave; signal processing means for converting the sound wave generating information of the sound wave generating means and the sound wave receiving information of the sound wave receiving means into vibration information of the free signal element;
And a determination unit that determines whether or not the signal information is an earthquake.

According to the present invention, since the movement of the free vibration element is measured by the sound wave and used as the vibration information, the earthquake determination can be accurately performed.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The first means of the present invention is a sound wave generating means for generating a sound wave, a free vibration element provided substantially in the front direction of the sound wave generating means, and reflected by the free vibration element. A sound wave receiving means for receiving a sound wave, a signal processing means for converting the sound wave generation information of the sound wave generating means and the sound wave reception information of the sound wave receiving means into the vibration information of the free vibration element, and whether the vibration information is an earthquake. The configuration is provided with a determination means for determining whether or not.

The second means is a sound wave generating means for generating a sound wave inside the fluid conduit, a free vibration element provided in the fluid conduit substantially in front of the sound wave generating means, and the free vibration element. Sound wave receiving means for receiving the sound wave in the fluid conduit reflected by the first sound wave generating means, and the first sound wave generating information of the sound wave generating means and the sound wave receiving information of the sound wave receiving means are converted into vibration information of the free vibration element. Signal processing means, determination means for determining whether or not the vibration information is an earthquake, and second signal for converting the sound wave generation information and the sound wave reception information of the sound wave reception means into flow rate information flowing through a fluid conduit. It is configured to include processing means.

The third means is a pair of sound wave transmitting / receiving means provided on a straight line inclined with respect to the central axis of the fluid conduit, and a direction further inclined with respect to the opposing direction of the sound wave receiving / transmitting means. And a first signal processing means for converting the sound wave reception information of the transmitting / receiving means into the vibration information of the free vibration element, and determining whether the vibration information is an earthquake or not. The configuration includes a determination unit and a second signal processing unit that converts the sound wave generation information and the sound wave reception information of the sound wave reception unit into flow rate information flowing through the fluid conduit.

Further, the fourth means is constructed such that two pairs of the sound wave receiving / transmitting means and the free vibration element facing the sound wave receiving / transmitting means are arranged in a twisted position.

The fifth means receives the sound wave generated by the first sound wave receiving and transmitting means by the second sound wave receiving and transmitting means,
Further, the reflected wave reflected by the free oscillator is received by the first sound wave receiving / transmitting means, the sound wave generated by the second sound wave receiving / transmitting means is received by the first sound wave receiving / transmitting means, and the free vibrator is used. The second sound wave receiving / transmitting means receives the reflected wave and the second sound wave receiving / transmitting means switches the transmission / reception of the first and second sound wave receiving / transmitting means and controls the sound wave generation and sound wave reception timing. .

Further, the sixth means is constituted so as to perform a seismic determination using the signal processing means for converting the displacement information obtained from the vibration information into velocity and acceleration by calculation and the velocity and acceleration.

Then, the seventh means is constructed so that the sound wave is generated at a specific cycle. Further, the eighth means is configured to obtain the vibration information at the first specific cycle, and to generate the sound wave at the second specific cycle shorter than the first specific cycle when the vibration information has a predetermined change. .

The ninth means is provided with a determining means for determining a vibration waveform from vibration information obtained in a constant cycle and determining whether or not there is an earthquake by waveform analysis.

In the tenth means, the maximum value of the specific cycle is within 10 seconds. Furthermore, in the eleventh means, the resonance frequency of the free oscillator is set near 20 Hz.

In the twelfth means, the reflecting surface of the free oscillator is formed in a concave shape so that the focal point matches the sound receiving surface of the sound wave receiving means or the sound wave receiving and transmitting means.

In the thirteenth means, the first signal processing means obtains the vibration information when the second signal processing means obtains the flow rate information with the flow rate.

Then, the fourteenth means has a constitution in which ultrasonic waves are used as sound waves. According to the first means of the present invention having the above-described configuration, it is possible to accurately determine the earthquake by obtaining the vibration information by measuring the movement of the free vibrator by the sound wave.

According to the second means, the flow rate information and the vibration information of the fluid can be obtained at the same time by measuring the vibration information by the sound wave in the fluid conduit.

Further, according to the third means, it is possible to measure the vibration information and the flow rate information by generating the sound wave once by using the pair of sound wave receiving and transmitting means and the pair of free vibration elements.

Further, according to the fourth means, by arranging two pairs of the sound wave transmitting / receiving means and the free vibration element at the twisted positions, the vibration information in the three directions can be obtained from the vibration information in the two directions. it can.

According to the fifth means, the function can be switched in accordance with arrival of the sound wave so that the first sound wave receiving / transmitting means serves both as the transmitting device and the receiving device for rationalization.

According to the sixth means, the vibration information can be converted from displacement into velocity and acceleration to improve the accuracy of earthquake judgment.

Further, according to the seventh means, it is possible to save power by generating the sound wave at a specific cycle.

According to the eighth means, the presence or absence of vibration is observed in the first cycle, and the vibration state is observed in the second cycle to save power and improve the accuracy of earthquake determination. You can

According to the ninth means, it is possible to improve the accuracy of seismic determination by observing the vibration waveform by observing at a constant cycle and using the waveform analysis.

Further, according to the tenth means, the cycle is set to 1
By setting it within 0 seconds, it is possible to make a judgment without missing the seismic waveform.

According to the eleventh means, the resonance frequency of the free vibration element is provided near 20 Hz to reliably measure the frequency of the earthquake and mechanically filter high frequency noise to improve the measurement accuracy. can do.

According to the twelfth means, the measurement accuracy can be improved by making the reflection surface of the free vibration element concave so as to concentrate the sound waves and increase the sound pressure.

According to the thirteenth means, it is possible to detect an emergency situation such as an earthquake when gas or the like is flowing by measuring the vibration when the flow rate is generated.

Further, according to the fourteenth means, it is possible to measure with good resolution even in a narrow space such as a fluid channel by using ultrasonic waves.

Hereinafter, a case where the seismic sensing device according to the first embodiment of the present invention is used in a gas passage will be described with reference to FIGS. 1 to 7.

As shown in the figure, the first as a pair of sound wave transmitting / receiving means for generating ultrasonic waves inside the fluid conduit 9 provided on a straight line inclined with respect to the central axis 9a of the gas fluid conduit 9
Ultrasonic transmitting / receiving element 10 and second ultrasonic transmitting / receiving element 1
1, a first diaphragm 12 and a first spring 13 which are respectively provided in a direction further inclined with respect to the facing direction of the first ultrasonic wave transmitting / receiving element 10 and the second ultrasonic wave transmitting / receiving element 11. The first free vibrating element 14 and the second free vibrating element 17 including the second vibrating plate 15 and the second spring 16 are provided. Then, the reflected wave reflected by the first vibrating plate 12 is received by the first ultrasonic wave transmitting / receiving element 10 and is used as the vibration information of the first free vibrating element 14 from the ultrasonic wave generation information and the ultrasonic wave reception information. The first signal processing means 18 for converting into the displacement and the determination means 19 for determining whether or not the vibration information regarding the displacement is an earthquake. On the other hand, the ultrasonic wave transmitted from the first ultrasonic wave transmitting / receiving element 10 is received by the second ultrasonic wave transmitting / receiving element 11, and the flow rate information is received by the second signal processing means 20 from the ultrasonic wave generation information and the ultrasonic wave reception information. It is configured to be converted by calculation. Here, 21 is an amplifier, 22 is a control device as control means, 23 is an earthquake signal output terminal, 24 is an arithmetic device for performing signal processing, and 25 is control means for switching the ultrasonic wave transmitting / receiving element between a receiving mode and a transmitting mode. Is a signal switch, and 26 is a battery. In addition, the first and second ultrasonic wave transmitting / receiving elements 10 and 11 are inclined at an angle of α, and the first and second free vibration elements 14 and 17 are inclined at an angle of β from the central axis.

In such a structure, as shown in FIG. 2, when an ultrasonic wave is generated by the control device 22 and the first ultrasonic wave transmitting / receiving element 10, the ultrasonic wave hits the first diaphragm 12 and is reflected. By receiving the reflected wave by the same first ultrasonic wave transmitting / receiving element 10, the first diaphragm 1
The time t1 when the sound wave reciprocates between the second ultrasonic wave transmitting / receiving element 10 and the first ultrasonic wave transmitting / receiving element 10 is measured. From this time, the distance L between the first diaphragm 12 and the first ultrasonic wave transmitting / receiving element 10 is measured. That is, the distance L is calculated by L = C * t1 / 2. Here, C is the speed of sound.

For example, L = 0.08 m, C = 340 m /
s, and the maximum displacement is 0.001 m, t1 = (0.0
8 + 0.001) * 2/340 = 0.000476, which is about 500 μsec. Also, in order to obtain only the displacement, the time for 0.08 * 2m is subtracted,
After all, the time of the displacement Δx is t1 ′ = 0.001 / 340.
= 0.0000029, which is about 3 μsec. Considering that it is necessary to measure this 3 μs with a resolution of about 128 divisions in order to measure the displacement waveform, as a unit time, from the transmission of ultrasonic waves by a counter of about 20 n seconds or less until reception You can see that you can measure by counting the time. The counter can be performed by the first signal processing means 18.

On the other hand, the simultaneously emitted ultrasonic waves are received by the opposing second ultrasonic wave transmitting / receiving element 11. Then, the arrival time t2 of the ultrasonic wave when there is a flow is measured from the time information at the time of transmission and the time information at the time of reception. Similarly, when an ultrasonic wave is generated from the other second ultrasonic wave transmitting / receiving element 11 after a predetermined interval T of a specific cycle, the second diaphragm 15 is generated.
By hitting, the displacement of the second diaphragm 15 can be measured by reflection. The displacement determines whether or not an earthquake is possible by determining whether or not the displacement is equal to or greater than a predetermined displacement. The ultrasonic waves emitted at the same time are received by the opposing first ultrasonic wave transmitting / receiving element 10, and the arrival time t3 of the ultrasonic wave when there is a flow is measured from the time information at the time of transmission and the time information at the time of reception. To do. The flow velocity v is calculated from these t2 and t3. Here, the flow rate can be measured by providing the inclination angle α.

That is, t2 = L / (C + v) and t3
Since = L / a (C-v), it is calculated by Δt = t3-t2 = 2Lv / (C 2 -v 2). In general, C ≧ v can be approximately calculated, and v = C ² * Δt / 2L can be calculated by the second signal processing means 20. Therefore, the time difference Δt between t2 and t3
The flow velocity is obtained from the above, and the flow rate is obtained by multiplying the cross-sectional area S of the fluid pipe. FIG. 4 is a chart showing the timing of transmission / reception in which an ultrasonic waveform is modeled, and FIGS. 5 and 6 are flowcharts thereof.

Further, in order to detect the occurrence of an earthquake, the displacement must be constantly measured, but as many earthquake motion waveforms show, the seismic wave lasts from 3 seconds to over 10 seconds. Therefore, in the present apparatus, ultrasonic waves are transmitted and observed at intervals of 2 seconds as the first specific interval T1. Then, the displacement is measured from the reflected wave of the ultrasonic wave generated at the interval of 2 seconds, and when the displacement becomes a predetermined value or more, it is determined by the determination means whether or not it is an earthquake. Therefore, when a displacement of a predetermined value or more appears, the 2 second interval is further shortened.

FIG. 7 shows a timing chart. For example, the second specific interval T2 is measured at 20 msec intervals. If the displacement is measured at 20 msec intervals, it is possible to measure up to a frequency of about 25 Hz according to the sampling theorem, so it is possible to observe almost seismic waveforms. Then, the seismic displacement waveform measured in 20 msec is converted into velocity and acceleration by the first signal processing means 18, and the characteristic of the waveform is extracted to determine whether or not it is an earthquake. In this way, by measuring at the first predetermined interval T1 and the second predetermined interval T2, it is possible to detect the occurrence of an earthquake without missing it, and it is possible to measure the displacement waveform of the earthquake. Waveforms and acceleration waveforms can also be converted. as a result,
Spectral intensity SI obtained from velocity response spectrum,
Seismic intensity can be determined by the galle value, which is the vibration acceleration level. In addition, by performing Fourier analysis, which is one of the waveform analysis, on each waveform of displacement, velocity, and acceleration, it is possible to analyze the component for each frequency, which is a feature of earthquakes.
It is also possible to determine whether or not there is an earthquake based on the magnitude of the frequency component around 5 Hz.

Further, by determining the earthquake from the vibration information only when the flow rate information shows that the flow rate exceeds a predetermined value, the number of determination processes can be greatly reduced and the battery life can be extended. However, if there is a flow rate, it is possible to correct the displacement measurement error due to the flow velocity and perform accurate measurement. Further, by setting the inclination angle β to 90 °, it is possible to eliminate the influence of the flow velocity in the conduit and measure the vibration of the free vibrator, and it is possible to improve the measurement accuracy.

The optimum specific cycle is 2 seconds, but it is considered that the specific cycle may be increased to about 10 seconds in order to prolong the life of the battery. However, in order to improve the accuracy of gas flow rate measurement, it is desirable that the length be as short as possible. Also, although the method of performing flow rate measurement and vibration measurement at the same time has been described, the same applies to other level sensors that use ultrasonic waves to measure the amount of storage in the measurement tank, and in the same way it is possible to detect earthquakes along with the amount of storage. It can be done, and safety management of large tanks can be performed. Further, the ultrasonic wave transmission circuit and the ultrasonic wave reception circuit can be used for both flow rate measurement and vibration measurement, and the circuit can be simplified. The wavelength can be suppressed to about 1 mm by setting the frequency of the ultrasonic waves to about 400 KHz, and the measurement can be performed even in a thin pipe such as a gas pipe or a fluid passage.

As described above, by measuring the movement of the free oscillator by the sound wave, the vibration information can be obtained and the earthquake judgment can be accurately performed, and the vibration information by the sound wave can be measured in the fluid conduit. Fluid flow rate information and vibration information can be obtained at the same time. Then, the vibration information and the flow rate information can be measured at a time by generating the sound wave once by using the pair of sound wave transmitting / receiving means and the pair of free vibration elements, and the measurement can be simplified and the life of the battery can be prolonged. it can. Further, the function can be switched in accordance with arrival of the sound wave so that the first sound wave receiving / transmitting means serves as both the transmitting device and the receiving device for rationalization. Furthermore, the vibration information can be converted from displacement into velocity and acceleration to improve the accuracy of earthquake determination. Power can be saved by generating sound waves at a specific cycle, and the presence or absence of vibration can be observed at the first cycle and the second cycle can be performed.
By observing the vibration state in the cycle of, it is possible to save power and improve the accuracy of earthquake judgment. Furthermore, by setting the cycle within 10 seconds, it is possible to make a judgment without missing the seismic waveform. When the flow rate is generated, the vibration can be measured to detect an emergency such as an earthquake when the gas or the like is flowing. Furthermore, according to the fourteenth means, it is possible to measure with good resolution even in a narrow space such as a fluid channel by using ultrasonic waves.

Next, a second embodiment will be described with reference to FIGS. 2 and 8 to 12. Portions having the same structure as those of the first embodiment and having the same function are denoted by the same reference numerals, and detailed description thereof will be omitted, and different portions will be mainly described.

FIG. 8 shows a cross section taken along the line AA 'shown in FIG. 2, and FIG. 9 shows a cross section taken along the line BB' shown in FIG. As is clear from FIG. 8 and FIG. 9, a straight line connecting the first ultrasonic wave transmitting / receiving element 10 and the first free vibration element 14, the second ultrasonic wave transmitting / receiving element 11 and the second free vibration element 17 are connected. The straight line connecting the points is arranged in a twisted position with respect to each other.

According to the above configuration, as shown in FIG.
It can be obtained by division calculation of a vector of vibration information obtained by measuring the X direction, the Y direction, and the Z direction, which are the three directions of the dimensional space. That is, the first ultrasonic wave transmitting / receiving element 1
From the vibration information in the linear direction connecting 0 and the first free vibration element 14, vibration information in the X direction and the Y direction is obtained, and the straight line connecting the second ultrasonic wave transmitting / receiving element 11 and the second free vibration element 17 is obtained. The vibration information in the X direction and the Z direction can be obtained from the vibration information in the direction. Therefore, it is possible to obtain vibration information in three directions from vibration information in two directions.

Since the free vibration element is composed of a spring and a weight, its resonance frequency is set to around 20 Hz. The resonance frequency f0 can be determined by the following equation and has a characteristic as shown in FIG.

[0049]

[Equation 1]

Here, the spring constant k and the mass m can be determined from practical dimensional constraints. By setting in this way, even if the seismic sensing device receives vibration from the outside, the response to the vibration becomes dull and cannot be detected due to noise of 20 Hz or more, so that it is possible to have a structure resistant to noise, and the electrical The filter can be omitted.

Further, as shown in FIG.
The reflection surface of is formed in a concave shape whose focal length matches the ultrasonic wave transmitting / receiving element 10, so that the sound pressure level of the reflected wave can be increased. That is, since the free vibration element 27 is arranged at a position slightly deviated from the front surface of the ultrasonic wave transmission / reception element 10, the level at which ultrasonic waves are incident is low. Since the reflected wave is further lowered, most of the reflected wave is the ultrasonic vibration element 1.
The configuration is such that it reflects toward 0.

As described above, by arranging the pair of sound wave transmitting / receiving means and the pair of free vibrating elements at the twisted positions,
The vibration information in three directions can be obtained from the vibration information in the directions. By providing the resonance frequency of the free vibration element in the vicinity of 20 Hz, it is possible to reliably measure the frequency of the earthquake and mechanically filter high-frequency noise to improve the measurement accuracy. Further, by making the reflecting surface of the free vibrating element concave, it is possible to improve the measurement accuracy by concentrating sound waves and increasing the sound pressure.

[0053]

As is apparent from the above description, according to the first means of the seismic sensing apparatus of the present invention, the movement of the free oscillator is measured by the sound wave to obtain the vibration information, and the earthquake determination is accurately performed. be able to.

According to the second means, the flow rate information and the vibration information of the fluid can be obtained at the same time by measuring the vibration information by the sound wave in the fluid conduit.

Further, according to the third means, the vibration information and the flow rate information can be measured by generating the sound wave once by using the pair of sound wave transmitting / receiving means and the pair of free vibration elements.

According to the fourth means, by disposing the pair of sound wave transmitting / receiving means and the pair of free vibrating elements at the twisted positions, the vibration information in the three directions can be obtained from the vibration information in the two directions. it can.

According to the fifth means, it is possible to rationalize the first sound wave receiving / transmitting means by switching the function according to the arrival of the sound wave so that the first sound wave receiving / transmitting means serves both as the transmitter and the receiver.

According to the sixth means, the vibration information can be converted from displacement into velocity and acceleration to improve the accuracy of earthquake determination.

Further, according to the seventh means, it is possible to save power by generating the sound wave at a specific cycle.

According to the eighth means, the presence or absence of vibration is observed in the first cycle, and the vibration state is observed in the second cycle to save power and improve the accuracy of earthquake judgment. You can

According to the ninth means, it is possible to improve the accuracy of seismic judgment by observing the vibration waveform by observing at a constant cycle and using the waveform analysis.

Furthermore, according to the tenth means, the cycle is set to 1
By setting it within 0 seconds, it is possible to make a judgment without missing the seismic waveform.

According to the eleventh means, the resonance frequency of the free vibration element is provided in the vicinity of 20 Hz to reliably measure the frequency of the earthquake and mechanically filter the high frequency noise to improve the measurement accuracy. can do.

According to the twelfth means, the measurement accuracy can be improved by making the reflecting surface of the free vibration element concave so as to concentrate the sound waves and increase the sound pressure.

According to the thirteenth means, it is possible to detect an emergency such as an earthquake when gas or the like is flowing by measuring the vibration when the flow rate is generated.

Further, according to the fourteenth means, it is possible to measure with good resolution even in a narrow space such as a fluid channel by using ultrasonic waves.

[Brief description of drawings]

FIG. 1 is a block diagram of a seismic sensor showing a first embodiment of the present invention.

FIG. 2 is a block diagram of the device.

FIG. 3 is a configuration diagram of the apparatus.

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

FIG. 5 is a flowchart showing a measurement operation of the device.

FIG. 6 is a flowchart showing a measuring operation of the device.

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

FIG. 8 is a sectional view of a seismic sensor showing a second embodiment of the present invention.

FIG. 9 is another sectional view of the device.

FIG. 10 is a vector diagram of measurement data of the device.

FIG. 11 is a characteristic diagram of a free vibration element of the device.

FIG. 12 is a sectional view of another embodiment of the same device.

FIG. 13 is a sectional view of a conventional seismic sensing device.

[Explanation of symbols]

 10 1st ultrasonic wave transmission / reception element 11 2nd ultrasonic wave transmission / transmission element 14 1st free vibration element 17 2nd free vibration element 18 1st signal processing means 19 Judgment means 20 2nd signal processing means 22 Control means

Claims (14)

[Claims] 1. A sound wave generating means for generating a sound wave, a free vibration element provided substantially in front of the sound wave generating means, a sound wave receiving means for receiving a sound wave reflected by the free vibration element, and the sound wave. A signal processing means for converting the sound wave generation information of the generating means and the sound wave reception information of the sound wave receiving means into the vibration information of the free vibrating element, and a judgment means for judging whether the vibration information is an earthquake or not. Seismic device. 2. A sound wave generating means for generating a sound wave provided in a fluid conduit, a free vibrating element provided substantially in front of the sound wave generating means, and a free vibrating element in the fluid conduit which is reflected by the free vibrating element. Sound wave receiving means for receiving a sound wave; first signal processing means for converting sound wave generating information of the sound wave generating means and sound wave receiving information of the sound wave receiving means into vibration information of the free vibrating element; A seismic sensing apparatus comprising: a determination unit that determines whether or not there is an earthquake; and a second signal processing unit that converts the sound wave generation information and the sound wave reception information of the sound wave reception unit into flow rate information flowing through a fluid conduit. 3. A pair of sound wave receiving / transmitting means provided to be inclined with respect to a central axis of a fluid conduit, a free vibrating element further provided to be inclined with respect to a facing direction of the sound wave receiving / transmitting means, and the receiver. First signal processing means for converting the sound wave reception information of the transmission means into vibration information of the free vibration element, judgment means for judging whether or not the vibration information is an earthquake, the sound wave generation information and the sound wave reception. The seismic sensing apparatus according to claim 2, further comprising second signal processing means for converting the sound wave reception information of the means into flow rate information flowing through the fluid conduit. 4. The seismic sensing apparatus according to claim 3, wherein the two pairs of pairs of the sound wave transmitting / receiving means and the free vibration elements provided so as to face each other are in a twisted position. 5. A sound wave generated by the first sound wave transmitting / receiving means is received by the second sound wave receiving / transmitting means, and a reflected wave reflected by the free vibration element is received by the first sound wave receiving / transmitting means. The first sound wave receiving / transmitting means receives the sound wave generated by the first sound wave receiving / transmitting means, and the reflected wave reflected by the free oscillator is received by the second sound wave receiving / transmitting means. 4. The seismic sensing device according to claim 3, further comprising control means for controlling transmission / reception switching of the reception / transmission means and timing of sound wave generation and sound wave reception. 6. Displacement information obtained from vibration information is used as velocity and
The seismic sensing apparatus according to any one of claims 2 to 5, wherein an earthquake determination is performed based on a signal processing unit that converts into acceleration and a signal from the signal processing unit. 7. The seismic sensing device according to claim 1, wherein the sound wave is generated in a specific cycle. 8. The vibration information is obtained in a first specific cycle, and when there is a predetermined change in the vibration information, sound waves are generated in a second specific cycle shorter than the first specific cycle.
The earthquake-sensing device according to any one of 1. 9. The seismic sensing apparatus according to claim 7, further comprising a determination unit that determines a vibration waveform from vibration information obtained in a constant cycle and determines whether or not there is an earthquake by waveform analysis. 10. The seismic sensing device according to claim 7, 8 or 9, wherein the maximum value of the specific period is within 10 seconds. 11. The seismic sensing device according to claim 1, wherein the resonance frequency of the free vibration element is set to about 20 Hz. 12. The seismic sensation according to claim 1, wherein the reflecting surface of the free vibration element has a concave shape such that the focal point matches the sound receiving surface of the sound wave receiving means or the sound wave receiving and transmitting means. apparatus. 13. The seismic sensing apparatus according to claim 2, wherein when the second signal processing means obtains flow rate information with a flow rate, the first signal processing means obtains vibration information. 14. An ultrasonic wave is used as a sound wave.
The seismic sensing device according to any one of 3 above.