JPH07225889A - Monitoring device for prevention of disaster - Google Patents

Abstract

PURPOSE:To test the informing function of a sensor at low cost by detecting the natural frequency sent from a receiver by the sensor and actuating artificially the sensor when its own natural frequency is coincidence with the detected frequency. CONSTITUTION:A receiver 11 is provided with a natural frequency generating circuit 20 which generates plural types of natural frequency. When the informing functions of sensors 14 and 15 are tested, the natural frequency sent from the circuit 20 is detected by a natural frequency detecting circuit 24. When this detected frequency is coincident with its own natural frequency set previously, a test light emitting element 26 is driven. When the element 26 emits the light by the circuit 24, a light receiving element 27 outputs a light reception signal. This reception signal is amplified by an amplifier and compared with the prescribed set value by a comparator. When the amplified signal exceeds the prescribed value, a counter circuit counts the working signals. Then a thyristor conducts when a fixed number of working signals is kept, and the signals lines 12 and 13 serving as the power supplies are short-circuited. Then the proper voltage produced by a resistor 29 is sent to the receiver 11 as a fire signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disaster prevention monitoring device having an automatic test circuit.

[0002]

2. Description of the Related Art Conventionally, as this type of disaster prevention monitoring device,
For example, the one as shown in FIG.
-233699 gazette, reference). As shown in FIG. 9, this device is configured to send an operation test power source from outside the dwelling unit to a plurality of detectors installed inside the dwelling unit, and sequentially operate each of the detectors.

The sensor shown in FIG. 9 has an input terminal Ia and an output terminal Ib of a power supply for operation test, and the input terminal Ia is an output side Ib of the power supply for operation test of the fire receiver or the output terminal Ib of the preceding detector. The output terminal Ib is connected to the input terminal Ia of the sensor at the subsequent stage or the input side of the power supply for operation test of the fire receiver. When performing the operation test of this sensor, the check power is supplied from the check circuit. At the time of this supply, the transistor Q6 is turned on, and when this is turned on, the base current of the transistor Q2 is bypassed and the transistor Q2 is turned off. With this off, the negative characteristic thermistor 2
A resistor Rx is connected in series to the temperature sensing unit 1 and
Output voltage rises and a control output is generated from the comparison unit 4.

Due to the generation of this control output, the transistor Q
1 operates as in the case of an actual fire. At the same time, the transistor Q3 is turned on with a slight delay from the on operation, the thyristor Q4 is turned on by this on, the transistor Q5 is turned on, and the transistor Q2 is turned off at the same time. The alarming operation by the transistor Q1 is continued during the delay time to facilitate the confirmation of the alarming test in the receiver.

When the thyristor Q4 turns on, the input terminal Ia
The output terminal Ib and the output terminal Ib are short-circuited through the thyristor Q4, and the fire detector check power supply at the next stage is supplied. On the other hand, the timer circuit 5 charges the capacitor C2 from the supply of the checking power supply, and when the charging voltage exceeds a certain voltage, the transistor Q7 is turned on to give a trigger signal to the thyristor Q4, and the negative characteristic thermistor 3 is provided. Even if control output is not generated from the comparison unit 4 due to a trouble such as breakage of the thyristor, the thyristor Q4 is forcibly turned on after 30 seconds.

In this way, the operation test of the fire detectors from the first stage to the last stage can be performed sequentially, and even if a malfunctioning fire detector occurs in the middle, the timer circuit 5 works to reach the final stage. You can check.

[0007]

However, in such a conventional disaster prevention monitoring device, an input terminal and an output terminal of a power supply for an operation test are provided, and inspection lines are drawn from the input terminal and the output terminal to perform inspection. Since the sensor is inspected by supplying the inspection signal from the line, there is a problem that the wiring cost increases and the device becomes expensive.

The present invention has been made in view of the above conventional problems, and is a disaster prevention monitoring apparatus capable of performing a warning test of a sensor at low cost with two transmission lines remaining. The purpose is to provide.

[0009]

In order to achieve the above object, the present invention detects a change in a physical phenomenon caused by a fire, which is connected to a pair of power and signal lines drawn from a receiver, In a disaster prevention monitoring device equipped with a detector that outputs a fire signal by short-circuiting a signal line that also serves as a power source, the receiver is provided with a natural frequency generation circuit that generates a plurality of natural frequencies, and the detector receives the reception signal. A natural frequency detection circuit that detects the natural frequency sent from the natural frequency generation circuit of the machine is provided, and when the natural frequency is matched with the preset natural frequency, the sensor is artificially notified, and the power source / signal line is also used. Is short-circuited.

Further, according to the present invention, a resistor having a unique resistance value which is different for each sensor between the signal lines also serving as the power source in the detector and a short circuit between the signal lines also serving as the power source when a fire signal is inputted. The switch means is provided in series. In the present invention, the natural frequency generation circuit and the natural frequency detection circuit are a piezoelectric ceramic that converts an input signal into mechanical vibration, and a tuning fork that resonates when mechanical vibration of the driving piezoelectric ceramic matches the natural frequency, A piezoelectric ceramic for converting mechanical vibration from the tuning fork into an electric signal is provided.

Further, according to the present invention, in the natural frequency generating circuit, a memory unit in which a plurality of natural pulses corresponding to the sensor are stored in advance, and a predetermined natural pulse is taken out from the memory unit to output a drive signal. It is characterized by being configured by a test control unit having a CPU for outputting and a switch means driven by the CPU for outputting a natural frequency via a coupling capacitor.

[0012]

According to the disaster prevention monitoring apparatus of the present invention having such a configuration, the natural frequency generation circuit provided in the receiver generates a natural frequency and sends it to the sensor during the alarm test of the sensor. , The natural frequency sent out by the natural frequency detection circuit provided in the sensor is detected, and when it matches the preset natural frequency, the sensor is pseudo-reported and the signal line for power supply and Since it is short-circuited, the sensor alarm test can be performed with two power source / signal lines, and it is not necessary to draw a separate inspection line to supply an inspection signal as in the conventional case, so wiring cost is reduced. It is inexpensive and inexpensive.

Further, a resistor having a unique resistance value different for each sensor is connected between the power source / signal lines in the sensor, and the power source / signal line is short-circuited by the input of the fire signal, so that the unique resistor is used. Since the voltage is sent to the receiver as a fire signal, the receiver can easily identify the issued sensor. Furthermore, since the resonance element having the tuning fork that resonates when the input signal matches the natural frequency is used for the natural frequency generation circuit and the natural frequency detection circuit,
The natural frequency is accurate and stable.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 7 are views showing an embodiment of the present invention.
FIG. 1 is a circuit diagram of a main part according to an embodiment of the present invention. Figure 1
In the figure, 11 is a receiver, and a pair of power / signal lines 12 and 13 are drawn from the receiver 11, and a plurality of sensors 14 and 15 are connected to the power / signal lines 12 and 13, respectively. 16 is a fire A / installed in the receiver 11
The fire A / D conversion circuit 16, which is a D conversion circuit, detects a fire signal from the detectors 14 and 15, converts the fire signal into a digital signal, and outputs the digital signal to the CPU 17. Further, the fire A / D conversion circuit 16 recognizes the sensor 14 or 15 that has issued the alarm by detecting the specific voltage of the resistor 29 having the specific resistance value at the time of issuing the alarm of the sensor 14 or 15.

Reference numeral 18 is a power supply terminal for outputting a power supply of 24 V, for example, and the power is supplied from the power supply terminal 18 to the fire A / D conversion circuit 16, the natural frequency generation circuit 20 and the detectors 14 and 15 via the resistor 19. Supplied. Reference numeral 21 is a recovery relay, and the recovery relay 21 is ON / OFF controlled by the CPU 17, and the recovery switch 22 is turned OFF or ON depending on whether the recovery relay 21 is ON or OFF. When the restoration switch 22 is turned off by turning on the restoration relay 21, the power supply to the sensors 14 and 15 from the power supply terminal 18 is cut off, and the sensors 14 and 15 are restored.

A natural frequency generating circuit 20 connected to the power source / signal line 12 via a coupling capacitor 23.
Is controlled by the CPU 17 to generate a plurality of natural frequencies and send them to the sensors 14 and 15. That is, the natural frequency generation circuit 20 has a plurality of resonance elements and generates a plurality of natural frequencies corresponding to the resonance elements. Reference numeral 24 is a natural frequency detection circuit provided in the smoke detector 25 of the sensor 14, and the natural frequency detection circuit 24 detects the natural frequency transmitted from the natural frequency generation circuit 20 of the receiver 11,
The test light-emitting element 26 formed of a light-emitting diode is driven when the preset natural frequency matches.

Reference numeral 27 denotes a light receiving element which is a light receiving diode provided in the fire detection circuit 28 together with the test light emitting element 26. The light receiving element 27 directly receives the light from the test light emitting element 26 and outputs a light receiving signal. Output. 29 is the resistance having a unique resistance value that differs for each sensor,
When the power supply / signal lines 12 and 13 are short-circuited, a unique voltage different for each sensor is received via the resistor 29.
To be sent to. This voltage is the receiver 11
Is detected by the fire A / D conversion circuit 16.

Next, FIG. 2 is a diagram showing the structures of the natural frequency generating circuit 20 and the natural frequency detecting circuit 24. Figure 2
In the figure, 30 is a U-shaped tuning fork made of special metal,
A pair of piezoelectric ceramics 31 and 32 are attached near the base of the tuning fork 30. One piezoelectric ceramic 31 has an input terminal 3
When an input signal (electrical signal) is input from 3, the piezoelectric effect converts it into mechanical vibration and excites the tuning fork 30. When the mechanical vibration from one piezoelectric ceramic 31 matches the natural frequency of the tuning fork 30, the tuning fork 30 resonates and the mechanical vibration enters the other piezoelectric ceramic 32. The other piezoelectric ceramic 32 converts the mechanical vibration transmitted from the tuning fork 30 into an electric signal again, and outputs it as an output signal from the output terminal 34. Reference numeral 35 is a support portion that supports the tuning fork 30, and the support portion 35 is a common ground. This resonance element uses a tuning fork 30 made of a special metal whose resonance frequency is accurate and stable, one piezoelectric ceramic 31 drives an input signal, and the other piezoelectric ceramic 3
2 is a non-contact type element that detects mechanical vibration, and is used in the natural frequency generation circuit 20 or the natural frequency detection circuit 24.

Next, FIG. 3 is a block diagram showing the configuration of the sensors 14 and 15. In FIG. 3, reference numeral 36 denotes the sensor 1.
The noise absorbing circuit and the rectifying circuit of the smoke detectors 25 of Nos. 4 and 15 absorb noise and the connection polarities of the sensors 14 and 15 are made nonpolar. Reference numeral 37 denotes an inrush current limiting circuit, and the inrush current limiting circuit 37 limits a current of a predetermined value or more among the currents input from the receiver 11. Reference numeral 38 denotes an oscillation circuit, and the oscillation circuit 3
A light emitting element 39 formed of a light emitting diode is connected to the reference numeral 8, and the test light emitting element 26 formed of a light emitting diode is connected. The oscillation circuit 38 is a light emitting element 39.
Is pulse-driven to emit light once for about 3 sec for 65 μsec.

Reference numeral 27 is the light receiving element composed of a light receiving diode. The light receiving element 27 is a light emitting element 39 when a fire occurs.
When the scattered light of the smoke particles of the light in the smoke detection space is received, it is photoelectrically converted and the received light signal is output to the amplifier circuit 40.
The amplifier circuit 40 amplifies the received light signal and outputs it to the comparison circuit 41. The comparison circuit 41 compares the light reception signal obtained from the amplification circuit 40 with a preset set value, and when a light reception signal equal to or larger than the set value is obtained, outputs it to the counting circuit 42. The counting circuit 42 counts the actuation signals in synchronization with the light emitting elements 39, and when a certain count value is reached, sends a warning signal to the switching circuit 44 via the semiconductor switch 43. The switching circuit 44 operates by receiving the warning signal, outputs a fire signal to the receiver 11, and turns on the warning display light emitting element 45.

On the other hand, when the natural frequency sent from the natural frequency generation circuit 20 of the receiver 11 is input to the natural frequency detection circuit 24 during the alarm test of the sensors 14 and 15, the natural frequency detection circuit 24 detects it. , The test light emitting element 26 is driven when the preset natural frequency matches. At this time, the natural frequency detection circuit 24 connects the contact piece 47 of the semiconductor switch 43 to the contact 48. That is, the semiconductor switch 43 connects the contact piece 47 to the contact point 49 at the time of monitoring and when a fire occurs, and connects the contact piece 47 to the contact point 48 at the time of the alarm test of the sensors 14 and 15.

When the test light emitting element 26 is driven to emit light by the natural frequency detecting circuit 24, the light receiving element 27 outputs a light receiving signal to the amplifying circuit 40. The received light signal is an amplification circuit 40
After being amplified by, the comparison circuit 41 compares it with a predetermined set value, and when it exceeds the set value, it is output to the counting circuit 42. The counting circuit 42 counts the actuating signal, and when a certain number of states continues, the thyristor (switch means) 50 is made conductive via the semiconductor switch 43.

Due to the conduction of the thyristor 50, the signal lines 12 and 13 also serving as the power source are short-circuited, and the voltage inherent to the resistor 29 is sent to the receiver 11 as a fire signal. Next, FIG. 4 is a view showing the structure of the smoke detector 25 of the sensors 14 and 15. In FIG. 4, 51 is an upper plate, and the upper plate 51
A plurality of labyrinth plates 52 are arranged in a ring shape at a predetermined interval on the top of the labyrinth plate 52. The labyrinth plate 52 allows the smoke particles 53 to flow into the interior from the outside and at the same time blocks light from entering the inside from the outside. ing. An insect screen 54 is attached to the lower side of the labyrinth plate 52 to prevent insects and the like from entering the inside.

The light emitting element 39 is provided inside the labyrinth plate 52, and the light receiving element 27 is arranged at a position deviated from the optical axis of the light emitting element 39 by a predetermined angle. A smoke detection space 55 is formed near the intersection of the optical axes. Light-shielding plates 56, 5 are installed in this smoke detection space.
7 is provided, the light blocking plate 56 prevents direct light from circling from the light emitting element 39 to the light receiving element 27, and the light blocking plate 57 causes scattered light when, for example, water droplets are attached to the tip of the light blocking plate 56. It is possible to prevent the incidence of light on the light receiving element 27 due to.

A device having a smoke detecting space 55 in which the optical axis of the light receiving element 27 is displaced from the optical axis of the light emitting element 39 in this way is known as a scattered light type smoke sensor, and smoke is detected in the smoke detecting space 55. When the particles 53 enter, the smoke particles 53 cause the light to scatter, and the light receiving element 27 receives a part of the scattered light due to the scatter phenomenon to detect a fire. On the other hand, the test light-emitting element 26 is provided at a position directly facing the light-receiving element 27, and the light-receiving element 27 is directly irradiated with light having a predetermined intensity corresponding to fire detection during the alarm test, and the detector 14,
We are going to do 15 alarm tests.

Next, the operation will be described. FIG. 5 shows the receiver 11
3 is a flowchart showing the operation of FIG. In FIG. 5, first, in step S1, it is determined whether or not a fire signal is received from the detectors 14 and 15, and when it is received, step S2 is performed.
Then, the fire A / D conversion circuit 16 converts the fire signal into a digital signal, notifies the CPU 17 of the digital signal, and performs fire notification processing.

FIG. 6 shows the operation of the detectors 14 and 15 from the occurrence of a fire to the sending of a fire signal. In FIG. 6, when the light emitting element 39 is driven by the oscillation circuit 38 in step S11, a fire occurs and the smoke detection space 55
When the smoke particles 53 enter, the light is scattered by the smoke particles 53, and in step S12, a part of the scattered light is received by the light receiving element 27 to detect a fire.

The light receiving signal output from the light receiving element 27 is amplified by the amplifier circuit 40 in step S13, and then compared with a preset value by the comparator circuit 41 in step S14. Is output to.
In step S15, the counting circuit 42 counts the operation signals, and when a certain number of states continue, outputs a warning signal to the switching circuit 44 via the semiconductor switch 43.

In step S16, the switching circuit 44 short-circuits the signal lines 12 and 13 that also serve as the power source, sends a fire signal to the receiver 11, and in step S17, turns on the light emitting element 45 for the reporting element to display the reporting. To do. Next, returning to FIG. 5 again, in step S3, it is detected whether or not the inspection mode is set, and in the inspection mode, the CPU 17 operates the natural frequency generation circuit 20. The natural frequency generation circuit 20 sets the natural frequency f _A according to the instruction of the CPU 17 in step S14, and transmits it to the sensors 14 and 15.

Next, in step S15, the sensors 14 and 15 are
Determine if the test worked. Here, FIG. 7 shows the operation of the sensors 14 and 15 during the alarm test. In FIG.
In step S21, the natural frequency detection circuit 24 causes the receiver 11
When the natural frequency f _A sent from the semiconductor switch 43 is detected, the contact piece 47 of the semiconductor switch 43 is connected to the contact 48, and step S
22 drives the test light-emitting element 26. When the light receiving element 27 receives the light emitted from the test light emitting element 26 in step S23, the light receiving signal is sent to the amplification circuit 40, and the amplification circuit 40 amplifies the light reception signal in step S24 and outputs it to the comparison circuit 41. .

In step S25, the comparison circuit 41 compares the preset value with a preset value.
The counting circuit 42 counts the actuation signal in step S26, and when it reaches a certain count value, the semiconductor switch 4
The thyristor 50 is brought into conduction in step S27 through step S3. When the thyristor 50 becomes conductive, the signal line 1 which also serves as the power source
2 and 13 are short-circuited, and the unique voltage of the resistor 29 is sent to the receiver 11 in step S28.

Now, returning to FIG. 5, the fire A / D conversion circuit 16 detects that the sensor 14 or the sensor 15 is in test operation by a voltage change by the resistor 29, and the CPU 1
A digital signal is sent to 7. Natural frequency detection circuit 24
If two sensors 14 and 15 are simultaneously issued in the same power / signal line 12, 13 due to the detection error of the above, two resistors 29 are connected to the same power / signal line 12, 13. Therefore, the fire A / D conversion circuit 16 of the receiver 11 detects the voltage change when the two resistors 29 are connected and detects the failure of the sensors 14 and 15. In this case, the failure of the sensors 14 and 15 is notified to the CPU 17 in step S6.

When the test operation of the sensors 14 and 15 is normally performed, the recovery process is performed in step S7. That is, the CPU 17 turns on the restoration relay 21 and turns off the restoration switch 22, shuts off the power supply from the power supply terminal 18, and restores the sensors 14 and 15. Then, in step S8, it is determined whether or not the alarm test for all the sensors 14 and 15 has been completed. If not, the natural frequency is changed in step S9 (f _A = f _A + f _B ). , And returns to step S4.

In this manner, the alarm test of the sensors 14 and 15 can be performed with the two power source / signal lines 12 and 13 remaining, and the inspection line is separately drawn to supply the inspection signal as in the conventional case. By doing so, it is not necessary to carry out the alarm issuing test of the sensor, so that the wiring cost is low and the cost is low. Next, FIG. 8 is a diagram showing another embodiment of the present invention.

In this embodiment, the internal structure of the receiver is changed to change the natural frequency generating circuit. In FIG. 8, reference numeral 61 denotes a receiver, and in the receiver 61, a test control unit 62 is provided. The test control unit 62 has a memory unit 63 in which a plurality of unique pulses corresponding to the sensors are stored in advance, a CPU 64 that extracts and outputs a predetermined unique pulse from the memory unit 63, and outputs the CPU 64 to a predetermined voltage. It has an interface section 65 for conversion and a transistor 66 as a switch means driven by the output of the interface section 65. The collector of the transistor 66 is connected to the power / signal line 68A via the coupling capacitor 67. Power source / signal line 68A, 6
A sensor (not shown) is connected to 8B.

The transistor 66 has a power supply terminal 6
The power of 24 V is supplied from 9 through the resistor 70. 7
Reference numeral 1 denotes a fire A / D conversion circuit similar to that of the above-described embodiment, and the fire A / D conversion circuit 71 converts a fire signal from the sensor into a digital signal and outputs the digital signal to the test control unit 62.

Reference numeral 72 denotes a power supply terminal similar to that of the above-described embodiment. 24 V of power is supplied from the power supply terminal 72 through the resistor 75 to the fire A / D conversion circuit 71 and also to the sensor. Reference numeral 73 is a recovery relay, and when the recovery relay 73 is turned on, the recovery switch 74 is turned off.

In the alarm issuing test of the sensor, the CPU 64 takes out a predetermined unique pulse from the memory section 63 and drives the transistor 66 via the interface section 65,
The signal line 6 also serving as the power source via the coupling capacitor 67.
The natural frequency is output to 8A. After the test operation of one sensor is completed, the recovery relay 73 is turned on, the recovery switch 74 is turned off, and the recovery process is performed.
The reference numeral 64 extracts another natural pulse from the memory section 63 and outputs the other natural frequency to the power / signal line 68A via the coupling capacitor 67.

Also in this embodiment, the same effect as that of the above embodiment can be obtained.

[0040]

As described above, when the sensor alarm test is performed, the natural frequency is sent from the natural frequency generation circuit of the receiver and the natural frequency sent from the natural frequency detection circuit of the sensor. Is detected, and when it matches the preset own natural frequency, the sensor is set to generate a pseudo alarm, so it is possible to carry out a sensor alarm test with the dual power-supply signal line. It is possible and inexpensive because it does not require wiring cost.

[Brief description of drawings]

FIG. 1 is a circuit diagram of an essential part showing an embodiment of the present invention.

FIG. 2 is a diagram showing structures of a natural frequency generation circuit and a natural frequency detection circuit.

FIG. 3 is a block diagram showing a configuration of a sensor.

FIG. 4 is a diagram showing the structure of a smoke detector of the sensor.

FIG. 5 is a flowchart showing the operation of the receiver.

FIG. 6 is a flowchart showing the operation of the detector when a fire occurs.

FIG. 7 is a flow chart showing the operation of the sensor alarm test.

FIG. 8 is a diagram showing a receiver according to another embodiment of the present invention.

FIG. 9 is a diagram showing a conventional example.

[Explanation of symbols]

 11, 61: Receiver 12, 13, 68A, 68B: Power source / signal line 14, 15: Sensor 16, 71: Fire A / D conversion circuit 17, 64: CPU 18, 69, 72: Power supply terminal 19, 70 , 75: Resistor 20: Natural frequency generation circuit 21, 73: Recovery relay 22, 74: Recovery switch 23, 67: Coupling capacitor 24: Natural frequency detection circuit 25: Smoke detection section 26: Light emitting element for testing 27: Light receiving element 28: Fire detection circuit 29: Resistor 30: Tuning fork 31, 32: Piezoelectric ceramic 33: Input terminal 34: Output terminal 35: Support part 36: Nozzle absorption circuit and rectification circuit 37: Inrush current limiting circuit 38: Oscillation circuit 39: Light emission Element 40: Amplifier circuit 41: Comparison circuit 42: Counting circuit 43: Semiconductor switch 44: Switching circuit 45: Warning display light emitting element 47 Contact piece 48, 49: Contact point 50: Thyristor (switch means) 51: Upper plate 52: Labyrinth plate 53: Smoke particles 54: Insect screen 55: Smoke detection space 56, 57: Light-shielding plate 62: Test control unit 63: Memory unit 65: Interface 66: Transistor

Claims (4)

[Claims] 1. A detector which is connected to a pair of power source / signal lines drawn from a receiver, detects a change in a physical phenomenon caused by a fire, and short-circuits the power source / signal line to output a fire signal. In the disaster prevention monitoring device, the receiver is provided with a natural frequency generating circuit for generating a plurality of natural frequencies, and the sensor is a natural frequency for detecting a natural frequency transmitted from the natural frequency generating circuit of the receiver. A disaster prevention monitoring device, comprising a frequency detection circuit, wherein a sensor is pseudo-reported when it matches a preset natural frequency, and the power source / signal line is short-circuited. 2. A resistor having a unique resistance value different for each sensor and a switch means for short-circuiting the power-supply signal line by the input of a fire signal are connected in series between the power and signal lines in the sensor. The disaster prevention monitoring device according to claim 1, wherein the disaster prevention monitoring device is provided in the. 3. The natural frequency generation circuit and the natural frequency detection circuit, a piezoelectric ceramic for converting an input signal into mechanical vibration, a tuning fork that resonates when mechanical vibration of the driving piezoelectric ceramic matches the natural frequency, The disaster prevention monitoring device according to claim 1, further comprising a piezoelectric ceramic for converting mechanical vibration from the tuning fork into an electric signal. 4. A memory unit in which a plurality of natural pulses corresponding to the sensor are stored in advance, and a CPU which extracts a predetermined natural pulse from the memory unit and outputs a drive signal. 2. The disaster prevention monitoring device according to claim 1, wherein the disaster prevention monitoring device is constituted by a test control unit which is driven by a CPU and outputs a natural frequency via a coupling capacitor.