JPH08138158A - Indoor change state detection device - Google Patents

Abstract

(57) [Summary] [Structure] A transmitter 11 that transmits ultrasonic waves to the window glass 2 and the door 3 in the room 1, and a receiver 12 that receives reflected waves reflected by the window glass and the door. A signal processing unit 13 that inputs a reflected wave signal from the receiver 12 to generate a reflected wave time series signal, a reflected wave time series signal generated by the signal processing unit 13, and a standard wave time series stored in advance. And a control device for comparing the signal and outputting an alarm signal according to the significant difference. [Effect] Since an abnormality such as a window glass or a door is detected based on the reflected wave signal of ultrasonic waves, it is possible to detect the abnormality more reliably than when detecting a sound generated at the time of abnormality. You can

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a detecting device for detecting a change state in a room, for example, an abnormal state such as breakage of a window glass or opening of a door.

[0002]

2. Description of the Related Art Conventionally, as a safety device for preventing theft of general households, buildings, etc., damage or opening of window glass,
There are things that detect opening of the door.

For example, when detecting breakage of a window glass, a sound generated when the window glass is broken is detected, and a magnetic sensor is used for opening the window glass and the door. .

[0004]

However, in the case of detecting the sound when the glass is broken, depending on the arrangement of the sound receiver and the arrangement of other indoor equipment,
Since the detection sensitivities are different, there is a drawback that the detection is unreliable and cannot be detected when the window glass is gently cut.

Further, regarding the above-mentioned window glass and the one in which the opening of the door is detected by the magnetic sensor, it is troublesome to install the magnetic sensor, and when the glass itself or the door itself is broken, it is necessary to detect it. There was a drawback that you couldn't.

Therefore, an object of the present invention is to provide a change state detecting device in a room which can solve the above problems.

[0007]

In order to solve the above-mentioned problems, the indoor change state detecting device of the present invention hits a transmitter which emits ultrasonic waves to an object to be detected in the room and is reflected by the object to be detected. A receiver that receives the reflected wave, a signal processing unit that receives the reflected wave signal from this receiver and generates a reflected wave time-series signal, and a reflected-wave time-series signal generated by this signal processing unit and is stored in advance. And a control device for comparing the generated reference wave time series signal and outputting an alarm signal according to the difference.

Further, in the above-mentioned change state detecting device,
The reflected wave time series signal when an abnormality occurs in the detected object is stored in advance in the control device as an abnormal wave time series signal, and this abnormal wave time series signal is compared with the actually received reflected wave time series signal. By doing so, the abnormal state of the detected object can be specified.

[0009]

In the above structure, ultrasonic waves are applied to the object to be detected,
The time series signal of the reflected wave is input to the control device, and the standard wave time series signal stored in advance in this control device is compared with the above reflected wave time series signal. Judges that the detected object is in an abnormal state,
An alarm signal is output from the control device to the alarm device. Therefore, it is possible to reliably detect the abnormal state of the detected object.

Further, by storing in advance the abnormal wave time-series signal corresponding to the abnormal state of the object to be detected in the control device and comparing the abnormal wave time-series signal with the reflected wave time-series signal, An abnormal condition can be specified.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In FIG. 1 and FIG. 2, reference numeral 1 denotes, for example, one room in a building, and in this room 1, a change state detection for detecting a damaged or open state of an object to be detected, such as a window glass 2 or a door 3 is detected. The device 4 is installed.

The change state detecting device 4 includes a transmitter 11 that transmits (emits) pulsed ultrasonic waves to the window glass 2 and the door 3 and a window glass 2 that is transmitted from the transmitter 11.
And a receiver 12 that receives the reflected wave reflected by the door 3, and a signal processing unit 13 that generates a time series signal of the reflected wave signal received by the receiver 12 (hereinafter referred to as reflected wave time series signal). Control for comparing the reflected wave time-series signal generated by the signal processing unit 13 with the standard wave time-series signal stored in advance and outputting an alarm signal to an alarm device (not shown) according to the comparison state. A device (for example, a microcomputer or the like is used) 14 is included.

The signal processing section 13 comprises a filter and amplifier 16 and an A / D converter 17. 3A shows the waveform signal of the ultrasonic wave transmitted from the transmitter 11, and FIG. 3B shows the reflected wave signal received by the receiver 12.

The reflected wave time series signal output from the signal processing unit 13 is a digital signal, and therefore the standard wave time series signal compared by the control device 14 is also a digital signal.

The control device 14 also outputs a drive signal for causing the oscillator 11 to emit a predetermined pulsed ultrasonic wave, and an amplifier 18 is provided between the control device 14 and the oscillator 11. Is provided.

Further, the standard wave time series signal stored in the control device 14 is a signal when there is no abnormality in the room 1, and the standard wave time series signal and the reflected wave time series signal are compared. If there is a significant difference between these two signals, it is determined that an abnormal state has occurred, and the control device 14 outputs an alarm signal to an alarm device (not shown).

By the way, what is used as the above significant difference is the difference in signal area between the standard wave time-series signal and the reflected wave time-series signal, the difference in peak number between both signals, and the difference in peak position ( (Change) is used, and when this difference is equal to or larger than the set value, it is determined that the state is abnormal. Further, the cross-correlation value of both signals may be used, and in this case, when the cross-correlation value is smaller than the set value, it is determined that the abnormal state is established.

Therefore, when the user exits the room 1, the change state detecting device 4 is kept in the operating state. In this state, pulsed ultrasonic waves are transmitted from the transmitter 11 as shown in FIG.

The ultrasonic wave transmitted from the transmitter 11 is
Multiple reflections are received at the receiver 12 at every place in the room 1. At this time, if the state of the room 1 changes,
The reflected wave received by the receiver 12 is repeatedly received with a fixed waveform.

Therefore, in this case, the control device 14
Even when compared with the standard wave time-series signal, no alarm signal is output because there is no significant difference between the two signals. However, when the window glass 2 is broken, or the door 3 is opened, the path of the reflected wave of the ultrasonic wave changes, so that the reflected wave time-series signal received by the receiver 12 becomes It changes a lot.

Therefore, when the changed reflected wave time-series signal is input to the control device 14, it is compared with the normal wave time-series signal without any abnormality, but naturally, there is a significant difference between the two signals. Since it has occurred, an alarm signal is output to the alarm device.

As described above, the ultrasonic waves can be used to accurately detect an abnormality in the chamber 1, for example, the damage of the window glass 2 or the opened state of the window glass 2 and the door 3. by the way,
In the above-described embodiment, the control device 14 is made to store the reflected wave time-series signal having no abnormality, but the abnormality state in the room 1 is further specified (understanding) in the control device 14.
In order to do so, the abnormal wave time series signal is stored when the window glass 2 is damaged, the door 3 is opened, and when the window glass 2 is damaged and the door 3 is opened at the same time. Every time, and when an abnormal condition occurs, the abnormal condition can be specified by comparing these abnormal wave time series signals.

Further, in the above embodiment, the control device 1
4 describes that the reflected wave time-series signal in a non-abnormal state, that is, a normal state is stored in advance. The reflected wave time-series signal in the state (1) may be stored as a standard wave time-series signal.

[0024]

As described above, according to the configuration of the present invention, ultrasonic waves are applied to the object to be detected, and the abnormality of the object to be detected is detected based on the reflected wave signal. , Compared with the case of detecting the sound generated when the detected object is damaged, it is possible to detect the abnormality more reliably, and it is necessary to install a magnetic sensor at each detected object as in the past. It can be installed very easily compared to the one.

Further, the control unit stores in advance a signal at the time of abnormality of the object to be detected, and by comparing this abnormal wave time-series signal with the received reflected wave time-series signal, the abnormal state is specified. can do.

[Brief description of drawings]

FIG. 1 is a plan view showing an arrangement state of a change state detection device in a room according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a change state detection device of the same embodiment.

FIG. 3 is a waveform diagram of the transmitted and reflected ultrasonic waves in the example.

[Explanation of symbols]

 1 Room 2 Window Glass 3 Door 4 Change State Detection Device 11 Transmitter 12 Receiver 13 Signal Processor 14 Control Device

Claims (2)

[Claims] 1. A transmitter for transmitting an ultrasonic wave to an object to be detected indoors, a receiver for receiving a reflected wave reflected by the object to be detected, and a reflected wave signal input from the receiver for reflection. A signal processing unit that generates a wave time-series signal, compares the reflected wave time-series signal generated by this signal processing unit with a pre-stored reference wave time-series signal, and outputs an alarm signal according to the difference. A change state detection device in a room, comprising: a control device. 2. A reflected wave time series signal when an abnormality occurs in an object to be detected is previously stored in the control device as an abnormal wave time series signal, and the abnormal wave time series signal and the reflected wave time actually received The abnormal state of the object to be detected can be specified by comparing it with a series signal.
The indoor change state detection device described.