JPS599580A - Apparatus for recording seismic intensity of earthquake - Google Patents

Abstract

PURPOSE:To record a seismic wave without protruding the same out of the recording paper, by a method wherein detection signals from seismometer provided in three directions are stored and the stored signals are magnified or contracted to be printed and recorded along with time information. CONSTITUTION:Detection voltage signals of seismometers 1-3 arranged in an east-west direction, a south-north direction and an up-and-down direction are digitized to be stored by a definite amount vibration data memory apparatus 5. At this time, a max. amplitude detecting program fixing apparatus 7 is operated to detect max. amplitude data and, when the amplitude thereof is larger than reference, a substantial analogue wave form formed by dots is contracted to record said data and, when smaller, magnified to record said data. In a usual case, it is recorded in reference magnification but, when the scale is magnified or contracted, magnification ratio is indicated and recorded in the vicinity of said wave form along with time graduation or display based on a reference time. These operations are performed by an amplitude regulating program fixing apparatus 8.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is capable of continuously recording ground vibrations such as earthquakes, especially waveforms of ground vibrations in three independent directions, within the paper width of an arbitrary prescribed recording sheet without deviation. The present invention relates to a recording device for recording the intensity of vibrations caused by earthquakes, etc., which automatically changes the scale or magnification of the amplitude at the beginning of writing as necessary, and prints and records the vibration intensity along with a time scale and time display.

In connection with recording ground vibrations, there is a conventional method in which electrical signals output from a seismic sensor are output directly onto recording paper for recording. A pen is installed, and the recording pen is moved in response to electrical signals output from a seismic sensor to record waveforms on recording paper.

However, with this method, it is extremely difficult to accurately analyze vibration phenomena such as earthquakes based on waveforms recorded on recording paper. In other words, recording the vibration waveform on the recording paper is actually
Because it is instantaneous, if the amplitude of the seismic vibration changes suddenly and drastically, the waveform will not be properly recorded on the recording paper. The pen shakes out.There are some devices that automatically or manually switch the amplitude range of the recording pen when a large vibration occurs, but the range switching device does not function until after a certain time delay. The vibrations up to that point have been shaken out and are not recorded, and in such cases, it is estimated by interpolation.

In view of the above-mentioned deficiencies of the conventional apparatus, and in order to solve the problems, the present invention records all waveforms that suddenly change within the paper width of the recording paper, regardless of the width of the recording paper, without deviating in three directions. , provides a recording device for analyzing vibrations such as earthquakes. To be more specific, the device for recording vibration intensity caused by earthquakes, etc. of the present invention includes seismic sensors installed in the east-west direction, north-south direction, and vertical direction with respect to the ground or other vibrating object, and these seismic sensors. an analog-to-digital converter that converts the output electrical vibrations from analog to digital, respectively, sequentially stores this continuous digital vibration data, and then stores these digital vibration data after a predetermined period of time, for example, about 4 seconds. The digital vibration data stored in the vibration data storage device and the digital vibration data storage device are sequentially output in a first-in-first-out manner and are printed and recorded on a continuous recording paper along with a time scale corresponding to standard time. a printer; a maximum amplitude detection program fixed storage device for detecting maximum data in the data storage device;
An amplitude adjustment programmer that appropriately adjusts the amplitude scale or magnification of the seismic waveform printed on recording paper, a fixed storage device, a real tights clock that operates based on broadcast time signals, and each of the above parts. It is characterized by consisting of a control device that controls the.

Next, the present invention will be explained in more detail with reference to the drawings.
In FIG. 1, reference numerals 1, 2, and 3 indicate seismic sensors that detect seismic wave vibrations in the east-west direction, north-south direction, and vertical direction, and are, for example, piezoelectric type seismic sensors. Mechanical vibrations caused by input seismic waves are output as electrical vibrations. Reference numeral 4 denotes an analog-to-digital converter, which converts input analog electrical vibrations or signals into digital vibrations, signals, or outputs. A vibration data storage device 5 temporarily stores the digital transducer data output from the analog-to-digital converter 4, and outputs the input vibration data in a first-in, first-out order. Reference numeral 6 is a dot printer that operates using digital signals, and uses vibration waveforms 14 in the east-west, north-south, and up-and-down directions formed by dots on a recording paper 13 based on a clock described later as a time scale. and print the record along with the time display (see Figure 2).
. Reference numeral 7 denotes a maximum amplitude detection program fixed storage device that detects maximum amplitude data in the seismic wave vibration data temporarily stored in the vibration data storage device 5. Reference numeral 8 denotes an amplitude adjustment program fixed storage device that adjusts or corrects the writing amplitude scale or magnification on the recording paper based on the output of the maximum amplitude detection program fixed storage device. 9 is a central processing unit (CPU) that controls each of the above devices,
5- IO is a real time clock
meclocl<) or a standard time clock, based on the time signal from public broadcasting that is taken in by the receiver 12 through the time signal selection circuit 9, the output of which is given to the CI) and finally to the recording paper output from the printer. It is displayed as a time scale or time display printed along with the seismic vibration waveform on the top or in the display window on the surface of the device.

Next, to explain the operation, each mechanical vibration detected by each seismic sensor 112 and 3 that detects vibration in three independent directions in space is output as a voltage signal, and this is an analog-digital signal. It is input to the converter 4. After being converted into digital vibration data by the analog-to-digital converter 4, this output is temporarily stored in the vibration data storage device 5 for a certain amount of time, for example 4 seconds. In the state ζ where digital vibration data is stored,
Maximum amplitude detection program The maximum amplitude detection program fixedly stored in the fixed storage device 7 operates.

That is, the maximum amplitude data among a certain amount of vibration data temporarily stored in the vibration data storage device 5 is detected. This is to ensure that this maximum amplitude data falls within the paper width of the recording paper. Next, if this maximum amplitude is larger than the standard, the substantially analog waveform formed by the substantially -1- dots on the recording paper is reduced from the standard and printed, and vice versa. If the waveform is smaller than the standard, the waveform is enlarged and recorded.

In normal cases, it is recorded using the magnification of the scale, but when the magnification or scale is reduced or expanded as described above and the vibration waveform of the seismic wave is printed and recorded, the vicinity of the waveform ζ This is the time scale or Along with the display, its magnification or scale is also printed, and this is done by the amplitude adjustment program fixing device 8.

Since the present invention is constructed as described above, the vibration waveforms of an earthquake in three directions, which suddenly become large in amplitude and also become small in amplitude, can be recorded on a recording sheet of a certain width without being completely blown out, and Waveforms with unnecessarily small amplitudes are not printed small and are large, which contributes to earthquake response.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of a recording device for recording vibration intensity due to earthquakes, etc. according to the present invention, and FIG. 2 is a diagram of recording paper output from a printer. In the figure, 1. East-west direction seismic sensor, 2. North-south direction seismic sensor, 3. -1-Downward direction seismic sensor, 4. Analog-digital converter, 5. Vibration data storage device. , 6...Printer, 7...Maximum amplitude detection program/fixing device, 8...Amplitude adjustment program/fixing device, 9...Control device, ]3...
·Recording paper. Patent applicant Takamizawa Zybernetics Co., Ltd. Engraving of drawings (no change in content) Figure 1 Procedural amendment (method) 1. Display of case 1982 Patent Application No. 118,979 2 Name of invention Recording device for vibration intensity of earthquakes etc. 3 Person making amendment Relationship to case Patent applicant address 2 Nishi-Shinjuku 1-3, Shinjuku-ku, Tokyo -14 (Heiwa Building) 4
, Date of amendment order October 26, 1980 5. Subject of amendment (1) Drawings (all drawings) 6. Contents of amendment as shown in the attached sheet.

Claims (1)

[Claims] Each seismic sensor is installed in the east-west direction, north-south direction, and vertical direction with respect to the ground or other vibrating object, a converter that converts the electrical vibration output from this seismic sensor from analog to digital, and this continuous A vibration data storage device that sequentially stores digital vibration data and then outputs the digital vibration data after a predetermined period of time in a first-in, first-out manner; A printer that prints and records a time scale and a number corresponding to standard time on a recording paper, a maximum amplitude detection program fixing device that detects the maximum data in the data storage device, and an earthquake that is printed on the printer's recording paper. An amplitude adjustment program fixing device for adjusting the magnification of a waveform, a real time clock that operates based on a broadcast time signal, and a control device for controlling each of the above-mentioned parts. Intensity recording device.