JPH02167435A - Seismoscope device - Google Patents

Abstract

PURPOSE:To stably detect the number of main vibration time zones of an earthquake wherein the on-off signal of a seismoscope continues by providing an off time width detecting means in addition to a detecting means for the number of times which are larger than prescribed on-off time width. CONSTITUTION:In addition to the detecting means 2 for the number of times which are larger than the prescribed on-off time width, the off time width detecting means 4 is provided which clears the prescribed time timer of the means 2 when there is an off state exceeding 2nd prescribed off time width. The when there is a signal break longer than the 2nd prescribed off time width after the seismoscope 1 generates a signal, the prescribed time timer is cleared even before prescribed time and a next signal from the seismoscope is expected. Therefore, the main signal continuance zone of the seismoscope 1 by the main vibration of an earthquake is never cut owing to the time-up state of the prescribed time timer and the earthquake is stably detected.

Description

[Detailed Description of the Invention] Industrial Field of Application The present invention relates to a seismic device that detects earthquakes, and particularly aims to provide a seismic device that is difficult to operate due to impact and operates stably during earthquakes. be.

2. Description of the Related Art As shown in FIG. 3, a conventional seismic sensing device of this type includes a seismic sensor 1 that generates a signal that repeatedly turns on and off due to vibration, and monitors the time width of the on and off periods and determines the specified period. Detecting means for detecting the number of times the on-off time width is greater than or equal to the specified on-off time width for detecting that the number of times the on-off time is greater than or equal to the specified on-time width is greater than or equal to the specified number of times within a specified time. As shown in Figure 4, its operation is as shown in C) and d) among the on/off signals of the seismic sensor in b) according to the period and amplitude of the seismic wave in a). First, the specified on-time width T is determined by the on-off time width. n (
s) On 2 which is equal to or greater than the specified off time width Tart is the first time, and then Off 3 which is equal to or greater than the specified off time width Tart ls1, and then On 5 which is equal to or greater than the specified on time width Tan(il)
is defined as the second time, and in the same manner, an on-time n that is equal to or greater than the prescribed on-time width with an off-time n-1 that is equal to or greater than the prescribed off-time width is regarded as the Ms-th time of the prescribed number of times, and this is the first time shown in b). If it is within the specified time Ts from the rise of the ON state, the repeated ON/OFF signal of the seismic sensor in b) is determined to be an earthquake signal and outputted from the output terminal 3 in Fig. 3. It had become. If the number of ON times that satisfy the specified conditions does not reach the specified number Ms even after the specified time Ts has elapsed, and the seismic sensor continues to generate ON/OFF signals, the following The next specified time Ts starts again from the rising edge of the ON state, and exactly the same detection is performed.

Problems to be Solved by the Invention According to the above-mentioned conventional detection means, it is possible to create a vibration sensing device that is difficult to operate due to shock, but it is always possible to detect vibrations in a time period divided by a specified time Ts from the first turn-on rise. Since detection is performed using the on/off signals of the seismic sensor, depending on the on/off signal of the seismic sensor that occurs during an earthquake, the main vibration of the earthquake may arrive after the first on signal is interrupted and the signal is interrupted for a while. When the on/off signal continues, the counting is interrupted when the specified time Ts is reached, and the specified number of times M is counted as the time period of the main vibration of the earthquake.
There was a risk that an earthquake could not be detected even though there were on/off signals more than s times.

The present invention solves this conventional problem, and even in the event of an earthquake where the on-off signal is interrupted for a while after the seismic sensor's on signal is first received, the time period of the main vibration is not missed. The purpose of the present invention is to provide a seismic sensing device that performs accurate detection and operates stably.

Means for Solving the Problems In order to solve the above problems, the seismic sensing device of the present invention includes a seismic sensor that generates a repeating on and off signal by vibration, and a seismic sensor that monitors the time width of the on and off times. 1. Detects that the number of on-offs that are greater than or equal to the specified on-time width is greater than or equal to the specified number of times within a specified time. The number of times detecting means monitors the off time width of the seismic sensor, detects that the off time width is equal to or greater than a second prescribed off time width, and counts a prescribed time timer of the number of times detecting means that the number of times the time width is equal to or greater than the prescribed on/off time width. and off-time width detection means for clearing.

As described above, the present invention, in addition to the conventional means for detecting the number of times exceeding a predetermined on/off time width, clears the predetermined time timer of the number of times detecting means if there is an off time equal to or greater than a second predetermined off time width. Since an off-time width detection means is provided, if after the first seismic sensor signal, there is a pause in the signal that is longer than the second specified off-time width, the specified time is detected even if the specified time has not yet reached the above-mentioned specified time. Since the timer count is cleared and the state is ready for the next seismic sensor signal, there is no risk that the seismic sensor's main signal continuation period due to the main vibration of the earthquake will be separated by the specified timer time-up, making it stable. Earthquakes can be detected.

Embodiments Hereinafter, embodiments of the present invention will be described based on the accompanying drawings.

In Fig. 1, the same parts as in Fig. 3 are given the same numbers, and 4 is an OFF time width detection means that monitors the OFF time width of the seismic sensor, and it is determined by the second regulation. If the off time width is exceeded, the count of the specified time timer of the means for detecting the number of times exceeding the specified on/off time width is cleared.

Figure 2 shows the operation of the seismic sensor with the above configuration during an earthquake.As shown in b), the on/off signal of the seismic sensor is first turned on, then the signal is interrupted for a while, and then If there is an earthquake wave as shown in a) where the on/off signal of the seismic sensor continues, if it is a conventional device, it will be detected in the middle of the on/off signal of the seismic sensor as shown in b). Not only will the specified time TS not reach the specified number of Ms times, but the next specified time Ts will not reach the original time T.
There was a risk that the number of times would decrease by the amount counted by S and the number of times would not reach the specified number of times. However, according to the device of this embodiment, as shown in C), after the first on/off signal of the seismic sensor is received, the second specified off time width T is reached.

If there is a pause in the signal for more than FF fill, at that point the specified time (
Ts) Since the timer is cleared and the device enters the standby state for the next signal input, when the next continuous on/off signal comes in, it will be interrupted in the middle by the specified time Ts like in the past. Instead, the continuous signal time period is detected from the beginning, so if there is a prescribed number of times Ms in that time period, there will be no chance of the signal being missed. In addition, in Fig. 2 b) and c), all on/off signals of the seismic sensor are treated as having a duration longer than a specified time width.

Effects of the Invention As described above, the seismic sensing device of the present invention provides the following effects.

Even in the case of an earthquake where the on/off signal is interrupted for a while after the seismic sensor's on signal is first received, the specified timer of the frequency detection means is activated by detecting a pause that exceeds the specified off time width. Since we have an off time width detection means that clears the count and returns to the original standby state even if the count has not yet reached the specified time, it is possible to detect the main vibration period of an earthquake during which the on/off signal of the seismic sensor continues. The number of times can be detected stably. In addition, it is often during relatively strong earthquakes that the seismic sensor ON signal occurs sporadically before the main vibration of an earthquake, and it is unreasonable that it works during a weak earthquake but not during a strong earthquake. It is possible to prevent this from occurring.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a vibration sensing device according to an embodiment of the present invention, Fig. 2 is an explanatory diagram of the operation of the same device, Fig. 3 is a block diagram of a conventional vibration sensing device, and Fig. 4 is an operation of the same device. It is an explanatory diagram. 1... Seismic sensor, 2... Means for detecting the number of times exceeding a specified on/off time width, 4... Means for detecting off time width. Name of agent: Patent attorney Shigetaka Awano (N)

Claims (1)

[Claims] A seismic sensor that generates a repeating ON and OFF signal by vibration; means for detecting the number of times the vibration sensor is turned on for more than a specified number of times within a specified period of time; 2. Detects that the off time width is longer than the prescribed off time width,
A seismic sensing device comprising an off time width detecting means for clearing a count of a predetermined time timer of the means for detecting the number of times the on/off time width exceeds the predetermined on/off time width.