JPH0413626Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a seismic waveform analysis and recording device that uses a thermal printer to depict and output the displacement of an input seismic waveform with respect to time on thermal paper as an analog waveform. The present invention relates to a seismic waveform analysis and recording device that expands seismic waveforms that cannot be reproduced as extended analog waveforms, and displays and discharges the expanded analog waveforms along with time marks on thermal paper.

It is more desirable to record or preserve records such as seismic vibration waveforms as statistical data for detecting abnormalities in the system and predicting earthquakes. Thermal printers, which use a head to heat the surface of thermal paper using gel heat to develop color and create images, are seen as promising. That is, the method using such a thermal printer has various advantages such as low noise, low vibration, high reliability, and is a dry type. However, despite these advantages, it is actually difficult to use. The maximum paper feeding speed of thermal paper is regulated by the thermal head and thermal paper, etc., and is limited to about 50 mm/sec. Near the paper feeding speed limit, for example, at about 15 to 20 Hz, there will be no waveform on the thermal paper. Even if it is recorded, the lines that draw the waveform are so crowded that it is impossible to analyze them, and they are painted black. If the thermal paper is fed at a speed that exceeds the paper feeding speed limit, in this case, the thermal head will not be able to obtain enough heat to color the necessary parts of the paper, and the physical vibrations described above will occur. It becomes impossible for the color development to follow the displacement of the color. Therefore, it has been practically impossible to record on thermal paper for the purpose of analyzing seismic waveforms of approximately 15 to 20 Hz or higher, such as those described above.

The present invention was devised to solve the above-mentioned problems, and consists of a sensor that detects seismic vibration, and an A-D converter that converts the electrical analog signal from the sensor into a digital signal. an analog-to-digital converter) and a RAM that stores digital signals from the A-D converter over time together with a clock signal from the CPU (central processing unit).
(random access memory), thermal paper is fed at a constant speed, and when an earthquake vibration waveform with a high abnormal frequency occurs in the observed waveform, the memory contents of the RAM are delayed and converted into an extended analog waveform. CPU output with extended clock signal
and a thermal head that outputs heat from the extended analog waveform from the CPU to the thermal paper surface along with the extended dotted time mark,
A seismic waveform analysis and recording device characterized in that a seismic observation waveform with a high abnormal frequency is drawn and discharged as an analog waveform extended with respect to a time axis on thermal paper together with an extended time mark.
It is. Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of one embodiment of the seismic waveform analysis and recording device of the present invention. In the figure, 1 is a sensor that detects seismic vibration and outputs it as an analog displacement.

This sensor 1 corresponds to a converter (converts large earthquake motion into voltage) in an earthquake recorder. Reference numeral 2 denotes an analog-to-digital converter, which inputs the analog signal output from the sensor 1 and outputs it as a digital signal. 3 is a random access memory (RAM), which is connected to the analog-to-digital converter 2 via a data bus 4;
The outputs are sequentially recorded, for example, in a linear list at predetermined locations in memory. When storing such a waveform, a time mark such as a second mark is also stored at the same time via the central processing unit (CPU) 5. The above operations are performed with the participation of the control bus 6 and address bus 7 in addition to the data bus 4, and are executed at a speed exceeding the speed limit regulated by the thermal head of the thermal printer and the thermal paper. . As mentioned above, this speed limit is approximately 15 to 20Hz when expressed in terms of frequency.
More specifically, this value is related to the diameter of the thermal dots in the thermal head in normal use, the number of thermal dots used, and the coloring sensitivity of the thermal paper.
In the case of 0.15 mm and 6 pieces (per 1 mm), analysis becomes impossible at about 15 to 20 Hz. Reference numeral 8 is a read-only memory in which a fixed program necessary for operating this device is stored. Reference numeral 9 denotes a thermal printer, which includes a thermal element, ie, a thermal dot, which generates heat by the heat generated when a current is passed through a resistor. A thermal head heats the required areas on the surface of the thermal paper to create color and create a waveform. To draw a waveform on thermal paper, the thermal head is operated at a speed within the printer's speed limit regulated by the thermal head and thermal paper, that is, the speed described above, and the thermal paper is drawn on the thermal paper along the time axis. executed along. The thermal dot analog waveform is rendered as an extended version with similarly spaced time marks, such as second marks, and exits the thermal printer.

FIG. 2 shows a printed thermal paper ejected from a conventional recording device, with seconds marks 10 and 10 seconds marked on the surface.
and waveform 11 (15Hz) are drawn, but they are almost completely painted in black and are in an unanalyzable state. FIG. 3 shows a surface of thermal paper on which the same waveform from the seismic waveform analysis and recording device of the present invention is recorded, and a second mark 12 and a waveform 13 are similarly drawn on the surface, but in this case, the time mark 12 Both waveforms 13 and 13 have been greatly expanded along the time axis, and even though they have the same frequency as the waveforms in Figure 2, they are clearly analyzable. .

As explained above, the present invention converts the seismic motion displacement coming from the sensor from analog to digital, and then converts the output with a time mark to correspond to the passage of time.The speed limit is regulated by a thermal head and thermal paper. The contents of the memory thus stored are sequentially stored in the memory at the above speed, and then the thermal head is operated at a speed below the speed limit regulated by the thermal head and thermal paper, and the thermal paper is sent onto the thermal paper. Since the analog waveform is displayed and output along with the extended time mark as an extended analog waveform along the time axis, it is possible to clearly record the waveform of seismic motion displacement, which was previously impossible to analyze. In this case, the waveform corresponds perfectly to the time mark, so the analysis can be performed with great precision and accuracy.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram of a seismic waveform analysis and recording device according to an embodiment of the present invention, Fig. 2 is a diagram showing a stored thermal paper surface ejected from a storage device according to the prior art, and Fig. 3 is a diagram showing a seismic waveform analysis and recording device according to an embodiment of the present invention. FIG. 3 is a diagram illustrating a recorded thermal paper surface to be ejected. 1...Sensor, 2...Analog-digital converter, 3...Random access memory, 9...
Thermal printer.

Claims (1)

[Scope of utility model registration request] a sensor that detects seismic vibration; an A-D converter (analog-digital converter) that converts an electrical analog signal from the sensor into a digital signal;
a RAM (random access memory) that stores the digital signal from the A-D converter over time together with a clock signal from the CPU (central processing unit);
Thermal paper is fed at a constant speed, and when an earthquake vibration waveform with a high abnormal frequency occurs in the observed waveform, the memory contents of the RAM are delayed and output as an extended analog waveform along with an extended clock signal. and a thermal head that outputs heat from the extended analog waveform from the CPU onto the thermal paper surface along with extended dot-like time marks. 1. A seismic waveform analysis and recording device characterized in that the seismic waveform analysis and recording device is outputted as an extended analog waveform along with an extended time mark.