JPH11337654A - Seismic-wave measurement device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a seismic-wave measurement device that can properly test calibration sensitivity. SOLUTION: An earthquake-wave detection signal being detected by a detector 2 of a building 1 is amplified by a signal amplifier 3 and is inputted to a calculator 6 of a central operation room 4 via an interface part 5 for monitoring an seismic wave. Also, when the calibration test of the detector 2 is performed, a detector 7 for calibration is provided near the detector 2, and furthermore, a vibrator 8 for hitting and vibrating the detector 2 and the detector 7 for calibration is provided. According to a command signal from an in-site calibration unit 9, the detector 2 and the detector 7 for calibration are hit and vibrated by the vibrator 8. The in-site calibration unit 9 outputs the detection signal from the detector 7 for calibration which is generated on vibration by the vibrator 8 to the calculator 6 via a communication interface part 13 and the interface part 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic wave measuring device which is installed in, for example, each building of a nuclear power plant and measures seismic waves.

[0002]

2. Description of the Related Art Numerous detectors (accelerometers) are installed in buildings such as nuclear power plants for seismic wave measurement. Then, the seismic wave exerted on the equipment arranged in the building is measured. FIG. 13 is a configuration diagram of a conventional seismic wave measuring apparatus. A building 1 on the site is provided with a plurality of seismic wave detectors 2, and detection signals detected by the respective detectors 2 are respectively output by a signal amplifier 3. It is amplified and input to a computer 6 for monitoring and control via an interface unit 5 of a central operation room 4 to be monitored.

In this case, a seismic wave detector (accelerometer) 2
We regularly check the soundness of the building. Detector 2
In the inspection, the impact test is carried out by once removing the detector 2 and attaching it to the test apparatus. This is because the detector 2 is mounted on a sturdy fixing block, and even if the fixing block is vibrated, effective vibration cannot be given in the three axes (X, Y, Z) directions. It is.

That is, the protective cover and the wiring of the detector 2 are removed, the detector 2 is removed from the base, the detector to be measured is attached to the sensitivity calibration tester, and a vibration is given to the reference for which the sensitivity is known. The sensitivity was measured by comparing the pulse peak value of the raw waveform with the detector.

[0005] The intensity of the vibration is confirmed by a human system by checking the raw waveform of the reference detector to determine whether the intensity is sufficient. If the change in the sensitivity exceeds a predetermined range, the data is rejected. To check the soundness, the signal output was connected to a spectrum analyzer for measurement. Further, the data is stored in a photograph or the like, and the pass / fail judgment was made by comparing the data with the previous data.

Thus, the detector is removed at the site,
It was calibrated by a sensitivity calibration tester installed in another location, and after the calibration data had been collected, it was input as sensitivity data to the seismic wave measuring device in the central operating room. Then, as a recovery operation after the test, the detector 2 was attached, the wiring was restored, and after confirming the attachment, the protective cover was attached.

[0007]

However, since the number of the detectors 2 to be inspected is large and the integrity test of the detectors 2 alone is performed, a large amount of work is required for removing, testing, and reattaching the detectors 2. Had become. Further, since the calibration test is a single soundness test of the detector 2, a system test including a signal processing system and a data processing system has to be separately performed.

Further, in the calibration test, since vibration is manually performed, reproducibility of vibration strength and continuous vibration at constant intervals cannot be performed. Since the sensitivity measurement data was stored in a photograph or the like, it took time to increase the number of files such as materials and to store and manage the materials.

An object of the present invention is to provide a seismic wave measuring apparatus capable of properly performing a calibration sensitivity test.

[0010]

According to a first aspect of the present invention, there is provided a seismic wave measuring apparatus provided in a building at a site for detecting a seismic wave, a signal amplifier for amplifying a signal detected by the detector, and a central operation device. A computer that is provided in a room and monitors the seismic wave by inputting a signal from the signal amplifier through an interface unit, a calibration detector provided in close proximity to the detector, the detector and the calibration A communication device that outputs a vibration command signal to the vibration device and a detection signal from the calibration detector when the vibration device is vibrated by the vibration device; And a field calibration unit that outputs the data to the computer via the interface unit.

In the seismic wave measuring device according to the first aspect of the present invention, the seismic wave detection signal detected by the detector at the site building is amplified by a signal amplifier, and input to a computer in the central operating room via an interface unit, and the seismic wave is detected. Perform monitoring. Also,
When performing a calibration test of this detector, a calibration detector is provided in the vicinity of the detector, and a vibrator for vibrating the detector and the calibration detector is provided. Then, according to a command signal from the on-site calibration unit, the vibration is given to the detector and the calibration detector by the vibration device. The on-site calibration unit outputs a detection signal from the calibration detector when struck by the percussion device to the computer via the communication interface unit and the interface unit.

According to a second aspect of the present invention, there is provided a seismic wave measuring apparatus according to the first aspect, wherein the calibration detector is integrally attached to the detector for detecting a seismic wave. I do.

[0013] In the seismic wave measuring apparatus according to the second aspect of the present invention, in addition to the function of the first aspect, the detector for detecting the seismic wave and the calibration detector are integrally attached and are vibrated by the vibrator. You.

According to a third aspect of the present invention, there is provided a seismic wave measuring apparatus according to the first or second aspect, wherein the natural frequency of a jig for fixing the detector to the building is determined by the detector. The frequency is higher than the frequency band of the seismic wave to be measured within the measurement frequency range.

According to a third aspect of the present invention, in addition to the operation of the first or second aspect, the natural frequency of the fixing jig is higher than the frequency band of the seismic wave to be measured. Therefore, the measurement of the seismic wave is sufficiently possible. At the time of calibration, since the natural frequency of the fixing jig is within the range of the frequency measured by the detector, the vibration component in the resonance frequency band is measured.

According to a fourth aspect of the present invention, there is provided the seismic wave measuring apparatus according to the first or second aspect, wherein a jig for fixing the detector to the building has a U-shaped cross section. The detector is attached to one side of the center of the formed U-shaped member, and the natural frequency is determined by the weight of the detector and the material and size of the U-shaped member.

According to a fourth aspect of the present invention, in addition to the function of the first or second aspect, in addition to the operation of the first or second aspect, the detector is provided at one side of the center of the fixing jig of the detector having a U-shaped cross section. The natural frequency is determined by the weight of the detector and the material and dimensions of the U-shaped member.

According to a fifth aspect of the present invention, in the seismic wave measuring apparatus according to the first or second aspect, the jig for fixing the detector to the building is formed in a silk hat shape. The detector is attached to the center of the disk above the top hat-shaped member, and the natural frequency is determined by the weight of the detector and the material and size of the top hat member.

According to a fifth aspect of the present invention, in addition to the operation of the first or second aspect, the seismic wave measuring apparatus further includes a center of a disk portion above a jig for fixing a detector formed in a silk hat shape. The natural frequency is determined by the weight of the detector and the material and dimensions of the top hat member.

The seismic wave measuring device according to a sixth aspect of the present invention is the seismic wave measuring device according to the fourth or fifth aspect, wherein the vibrator is provided inside the center of one side of the center of the U-shaped member, or It is provided inside the center of the upper disk portion of the top hat-shaped member, and the vibrator vibrates at a frequency equal to the natural frequency.

According to a sixth aspect of the present invention, in addition to the function of the fourth or fifth aspect, the fixing jig having a U-shaped cross section and the center of the fixing jig having a silk hat shape are provided. The vibration device provided on the inside vibrates at a frequency equal to the natural frequency of the fixing jig.

According to a seventh aspect of the present invention, there is provided a seismic wave measuring apparatus according to any one of the first to sixth aspects, wherein the vibrator comprises a movable part made of a magnetic material. And an electromagnet for driving the movable part during a test.

In the seismic wave measuring apparatus according to the seventh aspect of the present invention, in addition to the function of any one of the first to sixth aspects of the present invention, the movable portion of the percussion device is normally locked.
At the time of the calibration test, it is attracted by the electromagnet and used for single-shot vibration.

According to an eighth aspect of the present invention, there is provided a seismic wave measuring apparatus according to any one of the first to sixth aspects, wherein the vibration damper is distorted when an electric field is applied. A magnetostrictive element which is distorted when an element or a magnetic field is applied thereto, and a weight mounted on the electrostrictive element or the magnetostrictive element.

According to an eighth aspect of the present invention, in addition to the function of any one of the first to sixth aspects of the present invention, the electrostrictive element or the magnetostrictive element of the percussion device has an alternating current flowing through the coil. When flowing, the calibration detector is continuously vibrated by the action of the weight.

According to a ninth aspect of the present invention, there is provided a seismic wave measuring apparatus according to any one of the first to sixth aspects, wherein the impact device has a movable part formed of a permanent magnet. , A continuous electromagnetic hammer comprising an electromagnet for driving the movable portion during a test.

According to a ninth aspect of the present invention, in addition to the function of any one of the first to sixth aspects of the present invention, in addition to the function of the invention, the movable part of the percussion device comprising a permanent magnet is driven by an AC electromagnet. Vibrate the calibration detector continuously.

According to a tenth aspect of the present invention, in the seismic wave measuring apparatus according to the first aspect, the computer monitors a striking state of the calibration detector by the striking device and measures the striking strength. Is output when the value deviates from a predetermined intensity range.

According to a tenth aspect of the present invention, in addition to the operation of the first aspect, the seismic wave measuring apparatus displays raw waveform data of the calibration detector and monitors an excessive or insufficient vibration intensity of the percussion device. When the vibration data value of the calibration detector deviates from a predetermined intensity range, an alarm is output.

[0030] According to an eleventh aspect of the present invention, in the seismic wave measuring apparatus according to the first aspect, the computer monitors a vibration frequency of the detector or the calibration detector and obtains a frequency spectrum peak value. Is output when the value deviates from a predetermined range.

In the seismic wave measuring apparatus according to the eleventh aspect, in addition to the effect of the first aspect, the frequency spectrum waveform data of the detector and the calibration detector is displayed on the same screen as the previous data, and the vibration frequency When the frequency spectrum peak value deviates from a predetermined range, an alarm is output.

According to a twelfth aspect of the present invention, there is provided the seismic wave measuring apparatus according to the first aspect, wherein the on-site calibration unit comprises: a percussion driver for outputting a percussion command signal to the percussion device; A signal amplifier that amplifies a detection signal from the calibration detector when struck by the striking device,
An arithmetic unit for controlling the vibration driver and processing a detection signal from the signal amplifier, and a communication interface unit for performing signal transmission between the computer and the arithmetic unit. And

In a twelfth aspect of the present invention, in addition to the function of the first aspect, the vibrator vibrates the calibration detector based on a vibration command signal from a percussion driver. The detection signal is amplified by a signal amplifier signal and input to the operation unit. The arithmetic unit performs signal transmission with the computer via the communication interface unit.

According to a thirteenth aspect of the present invention, in the seismic wave measuring device according to the twelfth aspect, the on-site calibration unit includes a display unit for displaying monitoring data calculated by the computer. It is characterized by the following.

According to a thirteenth aspect of the present invention, in addition to the function of the twelfth aspect, the display unit of the on-site calibration unit displays monitoring data calculated by a computer in the central operation room.

According to a fourteenth aspect of the present invention, in the seismic wave measuring device according to the twelfth aspect, the arithmetic unit of the on-site calibration unit stores the vibration frequency and the vibration intensity of the vibration driver. A setting device for setting is provided.

In the seismic wave measuring device according to the fourteenth aspect of the present invention, in addition to the operation of the twelfth aspect, the vibration is performed at the vibration frequency and the vibration intensity of the vibration driver set in the setting device. Accurate measurements and linearity testing of detector sensitivity are possible.

According to a fifteenth aspect of the present invention, in the seismic wave measuring apparatus according to the twelfth aspect, the ID number of the detector is transmitted from the on-site calibration unit to the computer via the communication interface unit. And transmitting the detection data of the calibration detector, from the computer to the on-site calibration unit, to the sensitivity calculation result of the detector and the calibration detector, abnormal normal determination result, re-measurement instruction, to the display unit Is transmitted.

According to a fifteenth aspect of the present invention, in addition to the function of the twelfth aspect, the ID number of the detector and the detection data of the calibration detector are transmitted from the on-site calibration unit to the computer. The computer performs a monitoring process, and transmits the result from the computer to the on-site calibration unit.

According to a sixteenth aspect of the present invention, there is provided a seismic wave measuring device provided at a site building for detecting a seismic wave, a signal amplifier for amplifying a signal detected by the detector, and applying vibration to the detector. A percussion device, a percussion device driver that outputs a percussion command signal to the percussion device, and a signal from the signal amplifier provided in a central operation room through an interface unit to monitor the seismic wave and And a computer for controlling the percussion driver.

In the seismic wave measuring apparatus according to the sixteenth aspect, the detection signal of the detector struck by the striking device is amplified by a signal amplifier and transmitted to a computer provided in a central operation room. The computer monitors the transmitted seismic waves and controls the percussion driver.

According to a seventeenth aspect of the present invention, there is provided the seismic wave measuring apparatus according to the sixteenth aspect, wherein the computer is configured to control the vibrator driver so that the vibrator has a predetermined strength. And outputs an alarm when the sensitivity of the detector determined based on the detection signal of the detector deviates from a predetermined range, and outputs a vibration frequency of the detector. If the frequency spectrum peak value deviates from a predetermined range, an alarm is output.

According to a seventeenth aspect of the present invention, in addition to the function of the sixteenth aspect, the computer further includes a vibration command for the vibration driver to give the vibration of a predetermined intensity to the detector. Output a signal. Then, it is determined whether or not the sensitivity of the detector determined based on the detection signal of the detector has deviated from a predetermined range, and if deviated, an alarm is output. In addition, it is determined whether or not the frequency spectrum peak value of the vibration frequency of the detector has deviated from a predetermined range, and if deviated, an alarm is output.

An apparatus for measuring seismic waves according to the invention of claim 18 is a detector provided at a site building for detecting seismic waves, a signal amplifier for amplifying a signal detected by the detector, and a signal amplifier provided for a central operation room. A computer for inputting a signal from an amplifier via an interface unit to monitor the seismic wave, a vibration device for applying vibration to the detector, and a vibration command signal output to the vibration device and the detector And a field calibration unit for detecting the vibration signal and transmitting the vibration signal to the computer.

In the seismic wave measuring apparatus according to the eighteenth aspect, the detection signal of the detector struck by the striking device is amplified by a signal amplifier and transmitted to a computer provided in a central operation room. The computer monitors the transmitted seismic waves.
In the on-site calibration unit, a vibration command signal is output to a vibration device that applies vibration to the detector, and a vibration signal of the detector is detected by a laser vibrometer and transmitted to a computer.

According to a nineteenth aspect of the present invention, in the seismic wave measuring device according to the eighteenth aspect, the detector has a diffused reflection surface only at a portion to be measured of a shaft portion, and the other portions are tapered. Metal surface.

In the seismic wave measuring apparatus according to the nineteenth aspect, in addition to the function of the eighteenth aspect, the laser light from the laser vibrometer is not measured because it is obliquely reflected on the metal surface, and is not measured on the random emission surface. Is reliably measured with a laser vibrometer.

According to a twentieth aspect of the present invention, in the seismic wave measuring apparatus according to the nineteenth aspect, the detector is attached to an outer side of a fixing jig of the detector, and the vibrator is attached to an inner side. It is characterized by being attached.

According to the twentieth aspect of the present invention, in addition to the function of the nineteenth aspect, in addition to the function of the nineteenth aspect, the laser beam from the laser vibrometer is applied to a detector attached outside the fixing jig.

The seismic wave measuring apparatus according to the twenty-first aspect of the present invention is the seismic wave measuring apparatus according to the eighteenth aspect, wherein the natural frequency of the fixing jig of the detector is determined when the vibrator is struck. The frequency is set to be higher than both the vibration frequency of the detector and the vibration component measurement frequency of the laser vibrometer that detects the vibration signal of the detector.

In the seismic wave measuring apparatus according to the twenty-first aspect of the present invention, in addition to the function of the eighteenth aspect, the laser vibrometer measures the vibration of the detector from which a relatively low frequency vibration component of the laser vibrometer itself has been removed. To detect.

A seismic wave measuring apparatus according to a twenty-second aspect of the present invention is the seismic wave measuring apparatus according to the eighteenth aspect, wherein the protective cover of the detector attached to the fixing jig of the detector is made of a transparent material. It is characterized in that it is manufactured or provided with a peephole so that the optical axis can be aligned.

In the seismic wave measuring apparatus according to the twenty-second aspect, in addition to the function of the eighteenth aspect, in addition to the operation of the detector disposed in the protective cover, the laser beam is surely transmitted through a transparent material or a peephole. Irradiated, optical axis alignment becomes possible.

The seismic wave measuring device according to a twenty-third aspect of the present invention is the seismic wave measuring device according to the eighteenth aspect, wherein the on-site calibration unit comprises: a percussion driver for outputting a percussion command signal to the percussion device; A laser vibrometer that detects a vibration signal of the detector when struck by the vibrator, a processing unit that controls the vibrator driver and processes a detection signal from the laser vibrometer, and A communication interface unit for performing signal transmission between the computer and the arithmetic unit via the interface unit is provided.

In the seismic wave measuring apparatus according to the twenty-third aspect, in addition to the function of the eighteenth aspect, the percussion device is vibrated based on a percussion command signal from a percussion device driver. A vibration signal of the detector at the time of impact is detected by a laser vibrometer. The arithmetic unit controls the percussion driver and processes the detection signal from the laser vibrometer, and transmits signals to and from the computer in the central operating room via the communication interface unit and the interface unit.

According to a twenty-fourth aspect of the present invention, in the seismic wave measuring apparatus according to the twenty-third aspect, the on-site calibration unit includes a display unit for displaying monitoring data calculated by the computer. It is characterized by the following.

According to a twenty-fourth aspect of the present invention, in addition to the function of the twenty-third aspect, the display unit of the on-site calibration unit displays monitoring data calculated by a computer.

The seismic wave measuring apparatus according to a twenty-fifth aspect of the present invention is the seismic wave measuring apparatus according to the twenty-third aspect, wherein the calculation unit of the on-site calibration unit stores the vibration frequency and the vibration intensity of the vibration driver. A setting device for setting is provided.

According to the seismic wave measuring apparatus of the twenty-fifth aspect, in addition to the effect of the twenty-third aspect, the striking is performed with the striking frequency and the striking strength of the striking device driver set in the setting device. Accurate measurements and linearity testing of detector sensitivity are possible.

According to a twenty-sixth aspect of the present invention, in the seismic wave measuring apparatus according to the twenty-third aspect, the ID number of the detector is provided from the on-site calibration unit to the computer via the communication interface unit. And transmitting the detection data of the laser vibrometer, from the computer to the on-site calibration unit, the sensitivity calculation result of the detector and the calibration detector, abnormal normal determination result, re-measurement instruction, to the display unit The display data is transmitted.

According to a twenty-sixth aspect of the present invention, in addition to the effect of the twenty-third aspect, the ID number of the detector and the data detected by the laser vibrometer are transmitted from the on-site calibration unit to the computer. And performs a monitoring process, and transmits the result from the computer to the on-site calibration unit.

[0062]

Embodiments of the present invention will be described below. FIG. 1 is a configuration diagram of the seismic wave measuring device according to the first embodiment of the present invention.

The site building 1 has a plurality of seismic wave detectors 2
The detection signals detected by the respective detectors 2 are amplified by the signal amplifiers 3 respectively, input to the monitoring control computer 6 via the interface unit 5 of the central operation room 4, and monitored. The computer 6 has an output device 1 including a display device.
7 is connected, and the monitoring result is output to the output device 17.

A calibration detector 7 is mounted adjacent to each of the detectors 2 of the site building 1, and a vibration is given by a vibration generator 8 to generate a detection signal for a calibration test. The detection signal of the calibration detector 7 is input to the on-site calibration unit 9 and processed. The on-site calibration unit 9 outputs a vibration command signal to the vibration device 8.

The on-site calibration unit 9 amplifies the detection signal from the vibration detector 8 that outputs a vibration command signal to the vibration driver 8 and the calibration detector 7 when the vibration is performed by the vibration driver 8. And a computing unit 12 that controls the percussion driver 10 and processes a detection signal from the signal amplifier 11.
A communication interface unit 13 for performing signal transmission between the computer 6 of the central operating room 4 and the calculating unit 12, and a display of monitoring data calculated and transmitted by the computer 6 of the central operating room 4. Display unit 14 and the vibration driver 1
And a setting device 15 for setting a vibration frequency and a vibration intensity of 0.

As described above, the detection signal of the calibration detector 7 attached to the detector 2 for the calibration test is processed by the arithmetic unit 12 via the signal amplifier 11 of the on-site calibration unit 9 and is used for communication. The data is transmitted wirelessly from the site building 1 to the computer 6 in the central operating room 4 via the interface unit 13. On the other hand, the detection signal of the detector 2 for the calibration test is
The data is transmitted to the computer 6 in the central control room 4 by wire. The data of these detection signals are raw waveforms of the detector, and are subjected to data processing and frequency spectrum processing by the seismic wave measurement function of the computer 6 in the central operation room 4. The processing result is output to the output device 17
Is output to

Here, it is assumed that the calibration detector 7 is attached to the detector 2 every time a calibration test is performed, and that the vibrator 8 is permanently installed or is attached when necessary. This eliminates the need to remove the detector 2 when performing the calibration test,
Calibration test work can be performed in a short time.

Next, FIG. 2 is an explanatory view of the mounting of the calibration detector 7. In order that the calibration detector 7 can be attached to the detector 2, the structures of the detector 2 and the calibration detector 7 are as shown in FIG. FIG. 2 shows a state in which a calibration detector 7 is mounted on the upper part of the detector 2, a screw hole 2 B is provided on an upper part of the detector shaft 2 A of the detector body, and a screw is provided on a lower part of the detector of the calibration detector 7. A mounting screw 7A for the hole 2B is provided. Thereby, the calibration detector 7 can easily be connected to the detector 2,
Moreover, it is attached integrally with the detector 2.

FIG. 3 is an explanatory view of a jig for fixing the detector 2. The fixing jig 16 shown in FIG. 3 is a fixing jig having a U-shaped cross section. The detector 2 is attached to one side of the center of the U-shape, and the calibration detector 7 is attached to an upper portion thereof. In addition, the vibrator 8 is attached to the center inside (lower) of one side of the center of the U-shaped member. If the sides on both sides have sufficient strength, their natural frequencies are determined by the weight of the detector 2 and the calibration detector 7 and the length of one side in the middle, and thus can be set to an arbitrary frequency. The vibrator 8 vibrates at a frequency equal to its natural frequency.

FIG. 4 is an explanatory view of another example of a jig for fixing the detector 2. Fixing jig 16 shown in FIG.
Is a fixing jig having a top hat shape. The detector 2 is attached to the center of the disk on the top of the hat, and the calibration detector 7 is attached to the upper part. In addition, the vibrator 8 is attached to the center inside (lower portion) of the upper disk portion of the top hat-shaped member. In this case, the natural frequency can be determined by the weight of the detector 2 and the calibration detector 7, the material (density, strength) and dimensions of the top hat member. The vibrator 8 vibrates at a frequency equal to its natural frequency.

Here, the natural frequency of the fixing jig 16 of the detector 2 is higher than the frequency band (up to several Hz) of the seismic wave to be measured within the detector measurement frequency range (up to 1000 Hz). (For example, 20 Hz). As a result, seismic waves can be measured sufficiently, and vibration components in the resonance frequency band can be measured during calibration.

Next, FIG. 5 is an explanatory diagram of the single-shot type vibrator 8. The vibrator 8 has a movable portion 8A made of a magnetic material.
And an electromagnet 8B for driving the movable portion 8A during the test. That is, a hammer section 8C is provided below the movable section 8A, and the electromagnetic hammer body is mounted on a mounting jig 8D. Normally, the movable part 8A is shown in FIG.
The movable portion 8A moves downward when a current is applied to the coil 8E of the electromagnet 8B. Thereby, the hammer portion 8C gives vibration to the mounting surface of the detector 2 and the calibration detector 7.

The movable portion 8A is made of a magnetic material, for example, iron. The movable portion 8A is attracted by the electromagnet 8B during the calibration test and used for vibration. Since the vibrator 8 composed of the electromagnetic hammer is a combination of the electromagnet 8B and the weight of the magnetic material, it can only perform single-shot vibration.

FIG. 6 is an explanatory diagram showing an example of the continuous vibration device 8. FIG. 6A shows a vibrator 8 including an electrostrictive element 8F that is distorted when an electric field is applied, and a weight 8G mounted on the electrostrictive element 8F. , The length in the vertical direction changes, and the vibration of the weight 8G is generated according to the change in the AC voltage and acts on the detector 2. For example, barium titanate is used as the electrostrictive element 8F.

FIG. 6 (b) shows a vibrator 8 having a magnetostrictive element 8H that is distorted when a magnetic field is applied and a weight 8G mounted on the magnetostrictive element 8H. Apply AC voltage. Thereby, the length of the magnetostrictive element 8H in the vertical direction changes according to the change of the AC voltage,
The vibration is transmitted to the detector 2 by the vibration of the weight 8G. For example, ferrite is used as the magnetostrictive element 8H.

FIG. 7 is an explanatory view showing another example of the continuous vibration device 8. The vibrator 8 is a continuous electromagnetic hammer composed of a movable part 8I composed of a permanent magnet and an electromagnet 8E for driving the movable part 8I during a calibration test. That is, a hammer section 8C is provided below the movable section 8I, and the electromagnetic hammer body is mounted on a mounting jig 8D. When an alternating current is applied to the coil 8E of the electromagnet 8B, an attractive force and a repulsive force alternately act on the movable portion 8I composed of a permanent magnet depending on the polarity of the electromagnet 8B, so that continuous vibration can be achieved. As a result, the hammer 8C is connected to the detector 2
In addition, vibration is continuously applied to the mounting surface of the calibration detector 7.

Next, the monitoring processing in the computer 6 in the central control room 4 will be described. The computer 6 calibrates the detector 2 based on the detection signal of the detector 2 and the detection signal of the calibration detector 7 when struck by the striking device 8.

FIG. 8 is a waveform diagram of the detection signal S0 of the calibration detector 7 and the detection signal S1 of the detector 2 when the vibration is hit by the single-shot hitting device 8. First, the detection signal S of the detector 2
Then, the sensitivity Kx of the detector 2 is calibrated by comparing the first pulse peak value hx of 1 with the pulse peak value h0 of the detection signal S0 of the calibration detector. Now, assuming that the sensitivity K0 of the calibration detector 7 is:
The sensitivity Kx of the detector 2 is represented by the following equation (1).

Kx = (hx / h0) · K0 (1)

As described above, the sensitivity K of the detector 2 to be calibrated is
x is calculated from the sensitivity K0 of the calibration detector 7 registered in advance and the ratio of the measured pulse peak value h0 of the calibration detector 7 to the first pulse peak value hx of the detector 2 to be calibrated. Ask.

The monitoring data obtained by the computer 6 in the central control room 4 is output to the output device 17 and transmitted to the on-site calibration unit 9 to be displayed on the display unit 14 thereof. That is, the raw data of the detection signals of the calibration detector 7 and the calibration target detector 2 are displayed, and the sensitivity Kx of the calibration target detector 2 is also displayed together with the previous measurement data.

FIG. 9 is a waveform diagram of the detection signal S0 of the detector 7 for calibration and the detection signal S1 of the detector 2 to be calibrated when the continuous vibrator 8 strikes. In this case as well, as in the case of FIG. 8, the computer 6 in the central operating room 4 calculates the equation (1) based on the maximum amplitudes ho and hx of the vibration waveform at the time of continuous vibration and the sensitivity K0 of the calibration detector 7. , The sensitivity Kx of the detector 2 to be calibrated is calculated. Then, the raw data of the detection signals S0 and S1 of the calibration detector 7 and the detector 2 to be calibrated, the sensitivity Kx of the detector 2 to be calibrated, and the sensitivity at the previous measurement are sent to the on-site calibration unit 9. The data is output to the output device 17 and transmitted, and displayed on the display unit 14 of the on-site calibration unit 9.

FIG. 10 is a flow chart showing the monitoring process of the computer 6 in the central control room 4. First, the sensitivity Kx of the detector 2 to be calibrated is calculated based on the expression (1) (S
1) Display on the display device of the output device 17 and the display unit 14 of the on-site calibration unit 9 (S2). Then, the sensitivity Kx is compared with the previous value (S3). If the sensitivity Kx deviates from a predetermined range, it is determined that an abnormality has occurred, and an alarm is output to the output device 17 and the display unit 14 (S4).

Next, it is determined whether or not the vibration intensity of the calibration detector 7 by the vibration device 8 is appropriate (S5). If the vibration intensity is excessive or insufficient, that is, the calibration detector 7
If the vibration data value of the data deviates from the predetermined strength range,
An alarm is output to the output device 17 and the display unit 14 (S6). Then, a frequency analysis of the vibration frequency due to the vibration is performed (S7), and it is determined whether or not the frequency spectrum peak value has deviated from a predetermined range (S8). When the value deviates from the predetermined range, an alarm is output to the output device 17 and the display unit 14 (S9).

As described above, the raw waveform data and the sensitivity of the calibration target detector 7 are displayed on the same screen as the previous data for comparison, and the raw waveform data of the calibration detector 7 is displayed on the display screen. Display the vibration level and check the vibration state. Further, the frequency spectrum waveform data of the detector 2 and the calibration detector 7 are displayed on the same screen as the previous data and compared.

The operation unit 12 of the on-site calibration unit 9
Has a band-pass filter corresponding to the natural frequency of the fixing jig 16 of the detector 2. Therefore, within the detector measurement frequency range (up to 1000 Hz), the s / n ratio is good for vibration components in a resonance frequency band higher in frequency (for example, 20 Hz) than the frequency band of the seismic wave to be measured (up to tens of Hz). Measurement becomes possible.

Since the communication interface unit 13 of the on-site calibration unit 9 has a wireless communication function,
There is no need to lay cables for calibration for each individual detector 7, and the display 14 of the on-site calibration unit 9 displays sensitivity calculation results and abnormal normal judgment results (sensitivity, excessive vibration intensity insufficient, frequency spectrum abnormal alarm). ), The re-measurement instruction, the raw data of the detection signal of the calibration detector 7, the raw data of the detection signal of the raw detector 2 to be calibrated, and the previous data (raw waveform, frequency spectrum) of each detector are displayed. It is possible to make a retest and determine the adjustment of the impact strength at the site, and it is possible to eliminate wasteful work such as returning work.

Further, since the frequency and the vibration intensity of the driving function of the vibration driver 10, that is, the setting device 15, can be set, accurate measurement and linearity test of the sensitivity of the detector can be performed.

The items to be transmitted from the on-site calibration unit 9 to the central operation room 4 via the communication interface unit 13 include the ID number of the detector 2 to be calibrated and the data reception of the calibration detector 7. The items to be transmitted from the central operating room 4 to the on-site calibration unit 9 via the communication interface 13 include sensitivity calculation results and abnormal normality determination results (sensitivity, excessive vibration intensity, insufficient frequency spectrum). , A re-measurement instruction, raw data of a detection signal of the detector for calibration 2, previous data (raw waveform, frequency spectrum) of each detector, and the like. With these communication functions, it is possible to judge data even on site, and a retest reflecting the adjustment of the impact strength and the like is possible on site, thereby eliminating a wasteful work place such as a return work.

Next, a second embodiment of the present invention will be described. FIG. 11 is a configuration diagram of the seismic wave measuring device according to the second embodiment of the present invention. This second embodiment is different from the first embodiment shown in FIG. 1 in that the calibration detector 7 is omitted and the vibration driver 8 and the vibration driver 10 are replaced with the non-calibration detector 2. On the other hand, the detector 2 is permanently installed, and the detector 2 can be calibrated on-line by a command signal from the computer 6 in the central operation room 4. The result of monitoring by the computer 6 is output to the output device 17.

Referring to FIG. 11, a detector 2 for detecting a seismic wave is provided in a building 1 on site, and a detection signal of the detector 2 is amplified by a signal amplifier 3 and passed through an interface unit 5 of a central operation room 4. The data is input to the computer 6 and monitored. Each of the detectors 2 is provided with a vibrating device 8 for applying vibration to the detector 2, and the vibrating device 8 is driven by a vibration command signal from a vibration device driver 10. The vibration driver 10 is controlled by the computer 6. That is, the vibrator 8 is always attached to each of the detectors 2 by the fixing jig, and the vibration of a predetermined strength is performed by a command signal from the computer 6 in the central operation room 4. Here, the detector 2 is mounted on the upper part of the fixing jig, and the vibrator 8 is mounted inside the fixing jig.

The computer 6 in the central operating room 4 gives a vibration of a predetermined intensity to the vibrator 8 and obtains the sensitivity Kx of the detector 2 from the signal output of the detector 2 at that time. Then, the calculated sensitivity Kx is compared with the previous value, and if the sensitivity Kx deviates from a predetermined range, it is determined that there is an abnormality, and an alarm is output to the output device 17. Also, an alarm is output to the output device 17 when the frequency spectrum peak value deviates from a predetermined range.

Further, the raw waveform data and the sensitivity of the detector 2 are displayed on the same screen together with the previous data on the display device of the output device 17 connected to the computer 6 so that comparison is possible. The spectrum waveform data is displayed together with the previous data on the same screen of the display device of the output device 17 to enable comparison.

As described above, in the second embodiment, the calibration detector 7 is omitted, the vibrator 8 is always attached to the detector 2, and the sensitivity calibration is automatically performed only by remote control. Therefore, the calibration work of the detector can be performed smoothly.

Next, a third embodiment of the present invention will be described. FIG. 12 is a configuration diagram of a seismic wave measuring device according to the third embodiment of the present invention. The third embodiment is different from the first embodiment shown in FIG. 1 in that the calibration detector 7 is omitted and the signal amplifier 11 for amplifying the detection signal of the calibration detector 7 is replaced with a signal amplifier 11. A laser vibrometer 18 for detecting a vibration signal of the detector 2 is provided.

In FIG. 12, a detector 2 for detecting a seismic wave is provided in a site building 1, a detection signal of the detector 2 is amplified by a signal amplifier 3, and the signal is amplified by a computer via an interface unit 5 of a central operation room 4. 6 and is monitored. An output device 17 including a display device is connected to the computer 6, and the monitoring result is output to the output device 17.

[0097] Each detector 2 of the site building 1 has a vibrator 8
Is attached, and the vibration is given to the detector 2 by the vibration device 8. The percussion device 8 is driven in response to a percussion command signal from a percussion device driver 10 of the on-site calibration unit 9. A vibration signal of the detector 2 when struck by the striking device 8 is input to the laser vibrometer 18 of the on-site calibration unit 9 and processed by the calculation unit 12.

Signals are wirelessly transmitted between the computer 6 in the central operating room 4 and the arithmetic section 12 via the communication interface section 13. That is, the vibration signal obtained by the laser vibrometer is transmitted to the computer 6, and the computer 6 performs a calibration test of the detector 2 based on the detection signal of the detector 2 and the vibration signal of the detector 2. The calibration test result in this case is output to the output device 17.

The on-site calibration unit 9 is provided with a display unit 14 for displaying the monitoring data of the calibration test calculated and transmitted by the computer 6 of the central operating room 4,
Further, a setting device 15 for setting the vibration frequency and the vibration intensity of the vibration driver 10 is provided.

Here, in the laser vibrometer 18, the surface to be measured needs to be a diffuse reflector. Therefore, only the part to be measured at the axis of the detector 2 which is the measurement target surface of the detector 2 is set as the irregular reflection surface. For example, white paint is applied, and other portions are tapered metal surfaces. As a result, the laser light is obliquely reflected by the metal surface, and cannot be measured at portions other than the shaft portion. However, the irregularly reflected light at the shaft portion is reliably measured by the laser vibrometer 18.

The detector 3 is mounted by mounting the detector 2 outside the fixing jig of the detector and mounting the vibrator 8 inside.
Attach. By attaching the detector to the outside of the fixing jig 16, the detector 2 can be easily irradiated with laser light.

In this case, since the laser vibrometer 18 measures the changing speed of the distance between the detector 2 and the laser vibrometer 18, the vibration component of the laser vibrometer 18 itself is measured. Therefore, it is necessary to remove a relatively low frequency, and the natural frequency of the fixing jig 16 is set to be higher than both of the measurement frequencies.

When the laser vibrometer 18 is used, the calibration detector 7 is not required, and the mounting work is not required.
The maintenance time can be greatly reduced. Further, since the detector 2 is housed in the protective cover, the protective cover is made of a transparent material (for example, acrylic) to ensure that the laser light is irradiated to the detector 2, and the optical axis is The structure shall be easy to match. Alternatively, a hole for passing the laser beam from the laser vibrometer 18 is provided in the protective cover, so that the protective cover need not be removed.

The vibration signal of the detector 2 from the laser vibrometer 18 is monitored by the display device included in the output device 17 in the central operation room 4 and is displayed and monitored on the display unit 14 at the site. In addition, the waveform data of the detector 2 to be calibrated, the laser vibrometer waveform data, the sensitivity data of the previous detector 2, the sensitivity data of the current detector 2, the alarm (abnormal sensitivity measurement result, excessive vibration intensity, Shortage) is also monitored.

[0105]

As described above, according to the present invention, the calibration detector is mounted at a position where the same acceleration as that of the detector to be measured can be received, and a constant vibration is given by the vibration driver to perform the calibration. Since the test is performed, the calibration test can be performed with the detector to be measured attached.

[0106] In addition, since a vibrator for giving a constant vibration intensity is permanently installed at each detector position and the sensitivity is calibrated online from the central control room side, the calibration test of the seismic wave detector can be appropriately performed.

When a laser vibrometer is used to detect the vibration of the detector, the laser light is applied from outside the detector cover, so that the pre-recovery work can be simplified.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a seismic wave measuring device according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram of attachment of a calibration detector according to the first embodiment of the present invention.

FIG. 3 is an explanatory view of a detector fixing jig according to the first embodiment of the present invention.

FIG. 4 is an explanatory view of another example of the fixing jig of the detector according to the first embodiment of the present invention.

FIG. 5 is an explanatory diagram of a single-shot type vibrator according to the first embodiment of the present invention.

FIG. 6 is an explanatory diagram illustrating an example of a continuous-type vibrator according to the first embodiment of the present invention.

FIG. 7 is an explanatory view showing another example of the continuous vibration device according to the first embodiment of the present invention.

FIG. 8 is a waveform diagram of a detection signal of the calibration detector and a detection signal of the detector to be calibrated when struck by the single-shot striking device according to the first embodiment of the present invention.

FIG. 9 is a waveform diagram of a detection signal of a calibration detector and a detection signal of a detector to be calibrated when struck by a continuous-type striking device according to the first embodiment of the present invention.

FIG. 10 is a flowchart illustrating monitoring processing of a computer according to the first embodiment of this invention.

FIG. 11 is a configuration diagram of a seismic wave measuring device according to a second embodiment of the present invention.

FIG. 12 is a configuration diagram of a seismic wave measuring device according to a third embodiment of the present invention.

FIG. 13 is a configuration diagram of a conventional seismic wave measuring device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Site building 2 Detector 3 Signal amplifier 4 Central operation room 5 Interface part 6 Calculator 7 Calibration detector 8 Vibrator 9 Field calibration unit 10 Vibrator driver 11 Signal amplifier 12 Operation part 13 Communication interface part 14 Display part 15 Setting device 16 Fixing jig 17 Output device 18 Laser vibrometer

Claims (26)

[Claims] 1. A detector provided in a site building for detecting a seismic wave, a signal amplifier for amplifying a signal detected by the detector, and a signal from the signal amplifier provided in a central operation room via an interface unit. A computer for inputting and monitoring the seismic wave, a calibration detector provided in close proximity to the detector, a vibration device for applying vibration to the detector and the calibration detector, and the vibration device A field calibration unit that outputs a vibration command signal to the computer and inputs a detection signal from the calibration detector when the vibration is performed by the vibration device and outputs the signal to the computer via the communication interface unit and the interface unit. A seismic wave measuring device comprising: 2. The seismic wave measuring apparatus according to claim 1, wherein the calibration detector is attached integrally with the detector for detecting a seismic wave. 3. The seismic wave measuring apparatus according to claim 1, wherein a natural frequency of a jig for fixing the detector to the building is set within a frequency range of the detector measurement frequency. A seismic wave measuring device characterized by having a frequency higher than a frequency band of the seismic wave. 4. The seismic wave measuring apparatus according to claim 1, wherein a jig for fixing the detector to the building has a U-shaped cross section, and is provided at a center of the U-shaped member. A seismic wave measuring apparatus, wherein the detector is attached to one side, and the natural frequency is determined by the weight of the detector and the material and dimensions of the U-shaped member. 5. The seismic wave measuring apparatus according to claim 1, wherein a jig for fixing the detector to the building is formed in a silk hat shape and a disk portion on an upper portion of the silk hat shape member. Attach the detector in the center of the
The natural wave frequency is determined by the weight of the detector and the material and dimensions of the silk hat member. 6. The seismic wave measuring apparatus according to claim 4, wherein the vibrator is disposed inside a center of one side of a center of the U-shaped member, or a disk portion on an upper portion of the top hat-shaped member. A seismic wave measuring device provided at the center inside of the device, wherein the vibration device vibrates at a frequency equal to the natural frequency. 7. The seismic wave measuring device according to claim 1, wherein the vibration device is configured to drive a movable portion made of a magnetic material and the movable portion during a test. A seismic wave measuring device, characterized in that it is a single-shot electromagnetic hammer composed of an electromagnet. 8. The seismic wave measuring apparatus according to claim 1, wherein the percussion device has an electrostrictive element that is distorted when an electric field is applied or a magnetostrictive element that is distorted when a magnetic field is applied. A seismic wave measuring device comprising: an element; and a weight mounted on the electrostrictive element or the magnetostrictive element. 9. The seismic wave measuring apparatus according to claim 1, wherein the vibration device is configured to drive a movable portion formed of a permanent magnet and the movable portion during a test. A seismic wave measuring device characterized by being a continuous electromagnetic hammer composed of an electromagnet. 10. The seismic wave measuring device according to claim 1, wherein the computer monitors a vibration state of the calibration detector by the vibration device, and when the vibration intensity deviates from a predetermined intensity range. Is an alarm device for outputting an alarm. 11. The seismic wave measuring apparatus according to claim 1, wherein the computer monitors a vibration frequency of the detector or the calibration detector, and when a frequency spectrum peak value deviates from a predetermined range. An seismic wave measuring device characterized by outputting an alarm. 12. The seismic wave measuring apparatus according to claim 1, wherein the on-site calibration unit is configured to output a vibration command signal to the vibration device, and that the vibration device be vibrated by the vibration device. A signal amplifier that amplifies the detection signal from the calibration detector, a processing unit that controls the percussion driver and processes the detection signal from the signal amplifier, and a processing unit between the calculator and the processing unit. A seismic wave measuring device comprising a communication interface unit for performing signal transmission. 13. The seismic wave measuring apparatus according to claim 12, wherein the on-site calibration unit includes a display unit for displaying monitoring data calculated by the computer. 14. The seismic wave measuring apparatus according to claim 12, wherein a setting device for setting a vibration frequency and a vibration intensity of the vibration driver is provided in the arithmetic unit of the on-site calibration unit. A seismic wave measuring device characterized by the above-mentioned. 15. The seismic wave measuring apparatus according to claim 12, wherein the ID of the detector is sent from the on-site calibration unit to the computer via the communication interface unit.
The number and the detection data of the calibration detector are transmitted, and from the computer to the on-site calibration unit, the sensitivity calculation result of the detector and the calibration detector, the abnormality normal determination result, the re-measurement instruction, the display unit, A seismic wave measuring device characterized by transmitting display data to a computer. 16. A detector provided at a site building for detecting a seismic wave, a signal amplifier for amplifying a signal detected by the detector, a vibrator for applying vibration to the detector, and A percussion driver that outputs a percussion command signal, and a computer that is provided in a central operation room, receives a signal from the signal amplifier via an interface unit, monitors the seismic wave, and controls the percussion driver. A seismic wave measuring device comprising: 17. The seismic wave measuring apparatus according to claim 16, wherein the computer outputs a vibration command signal to the vibration driver to cause the vibration device to give a vibration of a predetermined intensity to the detector. When the sensitivity of the detector determined based on the detection signal of the detector deviates from a predetermined range, an alarm is output, and the frequency spectrum peak value of the vibration frequency of the detector falls within a predetermined range. An seismic wave measuring device characterized by outputting an alarm when deviating. 18. A detector provided in a site building for detecting seismic waves, a signal amplifier for amplifying a signal detected by the detector, and a signal from the signal amplifier provided in a central operation room via an interface unit. A computer that inputs and monitors the seismic wave, a vibration device that provides vibration to the detector, and outputs a vibration command signal to the vibration device, detects a vibration signal of the detector, and transmits the vibration signal to the computer. An on-site calibration unit for performing the measurement. 19. The seismic wave measuring apparatus according to claim 18, wherein only a portion to be measured of a shaft portion of the detector is a diffusely reflecting surface, and the other portion is a tapered metal surface. Seismic wave measuring device. 20. The seismic wave measuring apparatus according to claim 19, wherein said detector is mounted outside a fixture for fixing said detector, and said vibrator is mounted inside said fixing jig. measuring device. 21. The seismic wave measuring apparatus according to claim 18, wherein the natural frequency of the fixing jig of the detector is a vibration frequency of the detector when struck by the striking device, and A seismic wave measuring apparatus characterized in that the frequency is set to be higher than both of a vibration component measuring frequency of a laser vibrometer itself for detecting a vibration signal of a vessel. 22. The seismic wave measuring apparatus according to claim 18, wherein the protective cover of the detector attached to the fixing jig of the detector is made of a transparent material or provided with a sight hole, and A seismic wave measuring device having a structure capable of axial alignment. 23. The seismic wave measuring apparatus according to claim 18, wherein the on-site calibration unit is configured to output a vibration command signal to the vibration device, and a vibration device driver outputs a vibration command signal to the vibration device. A laser vibrometer for detecting a vibration signal of the detector, a calculation unit for controlling the vibration driver and processing a detection signal from the laser vibration meter, and a signal between the calculator and the calculation unit. A seismic wave measuring apparatus, comprising: a communication interface unit for performing transmission via the interface unit. 24. The seismic wave measuring apparatus according to claim 23, wherein the on-site calibration unit includes a display unit for displaying monitoring data calculated by the computer. 25. The seismic wave measuring apparatus according to claim 23, wherein a setting device for setting a vibration frequency and a vibration intensity of the vibration driver is provided in the arithmetic unit of the on-site calibration unit. A seismic wave measuring device characterized by the above-mentioned. 26. The seismic wave measuring apparatus according to claim 23, wherein the ID of the detector is sent from the on-site calibration unit to the computer via the communication interface unit.
The number and the detection data of the laser vibrometer are transmitted, and from the computer to the on-site calibration unit, the sensitivity calculation result of the detector and the calibration detector, the abnormality normality determination result, the re-measurement instruction, the re-measurement instruction, A seismic wave measuring apparatus characterized by transmitting display data of (1).