JPH084636Y2 - Motion detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a motion detector for detecting a moving object, which is a combination of a microwave Doppler sensor and a pyroelectric infrared sensor (hereinafter referred to as PIR sensor).

[Prior Art] FIG. 3 shows an example of the configuration of a conventional motion detector of this type.

In the figure, 1 is a microwave Doppler module, 2 is an amplifier, 3 is a band filter, 4 is a level determiner, and 5 is PI.
R element, 6 is an amplifier, 7 is a band filter, 8 is a level determiner, 9 is an output logic circuit, 10 is a detection output terminal, 11 is an IR lens, 12 is a stabilized power supply, and 13 is a power supply input terminal.

The microwave signal is radiated from the microwave Doppler module 1 into the space through the microwave antenna 20.

The output is 8mW, the sensitivity is about -90dBC with return loss, and the antenna gain is about 9dB.

When an object exists in the space, part of the reflected wave returns to the Doppler module 1. When the object is moving, a Doppler signal having a frequency proportional to the velocity is obtained. If the microwave transmission frequency is f _O (Hz), the speed of the object is V (m / s), the speed of light is C (m / s), and the angle between the microwave transmission direction and the moving direction of the object is θ. , The frequency fd of the Doppler signal is Is obtained.

The transmission frequency of the Doppler module 1 is 10.525 GHz.

The Doppler signal obtained by the Doppler module 1 is amplified by the amplifier 2 by about 70 dB and guided to the bandpass filter 3.
The Doppler signal in this case is about 1 to 30 Hz from the range of human walking speed, and the frequency band of the bandpass filter 3 is also adjusted to this. When the target object approaches, the amplitude of the Doppler signal increases, and when it exceeds the set level, the level determiner 4 makes a determination, and the Doppler signal detection signal is sent to the output logic circuit 9.

On the other hand, the PIR element 5 has a sensitivity of 1300 (V / W), A response wavelength of 7 μm to 14 μm is used, and the visual field of the detection area is monitored through the IR lens 11 having a divided surface. When a person enters this area, each time it passes through each field of view divided by the IR lens 11, the difference between the radiation temperature of the background and the radiation temperature of the person is converted into a minute electric signal.

This signal is amplified by amplifier 6 by about 70 dB, and bandpass filter 7
Send to.

The amplitude level of the signal of the PIR sensor is a function of the distance of the target object from the sensor, and the level determiner 8 sets the signal amplitude generated when a person enters or leaves the divided visual field in the area as the amplitude at the set maximum distance. Comparison is made and a detection signal is sent to the output logic circuit 9.

The output logic circuit 9 takes the logical product of the Doppler signal detection signal and the PIR detection signal, and when both signals overlap at the same time,
The detection output signal is sent to the output terminal 10.

FIG. 4 shows the detection area of FIG. In the figure, 24 is the detection area of the microwave Doppler sensor, 25 is the detection area of the PIR sensor, and 26 is the motion detector.

IR lens 11 attached to motion detector 26
The field of view is set to 80 ° in the horizontal direction and the number of divisions is set to 7. Therefore, the walking speed of a person is set to 4 Km / h, and the bandpass filter 7 is used to detect the signal component.
It is used as a filter for 0.1 to 10 Hz.

This type of motion detector is often used for controlling an automatic door in a large building or the like, or for monitoring the intrusion of people into each room. In such a case, it is necessary to regularly check whether or not each detector is operating normally.

Conventionally, in the above confirmation, a method has been adopted in which a person purposely goes to the detection area of the detector and moves within the detection area to confirm the operation of each detector.

[Problems to be Solved by the Invention] As described above, in the conventional motion detector, a person who bothers to go to the detection area of the detector and periodically moves in the detection area to periodically check whether or not the operation is normally performed. Therefore, there is a problem that it takes a lot of time and labor to collectively manage the detectors installed in each room of a large building.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a motion detector capable of easily confirming whether or not it is operating normally.

[Means for Solving the Problems] The motion detector of the present invention has a diode in front of the antenna of the microwave Doppler element, and a circuit for remotely controlling the energization of the diode is provided in front of the pyroelectric infrared element. A resistor is provided, a circuit for remotely controlling the energization of the resistor is provided, and a diagnosis as to whether or not the resistor is normally operating can be performed by energizing the diode and the resistor by remote control. is there.

[Operation] A part of the microwave is reflected when the diode is energized and the microwave is transmitted when the energization is stopped. The microwave Doppler module (homodyne detector) can generate an AC signal equivalent to the Doppler signal generated by human motion in synchronization with the above reflection and transmission timings, and the microwave Doppler sensor operates normally. You can check whether or not.

On the other hand, the resistor placed in front of the PIR element generates heat when energized and gives an output change to the PIR element, so that the operation of the PIR sensor can be confirmed.

[Embodiment] FIG. 1 shows a configuration of an embodiment of the present invention, and FIG. 2 shows an arrangement state of a diode, a resistor and the like according to an embodiment of the present invention.

In the figure, the same reference numerals as those in FIG. 3 denote the same or corresponding ones, 14 is a switching diode, 15 is a diode conduction circuit, 16 is a resistor, 17 is a resistor conduction circuit, 18 is a timer, 19 is a conduction control terminal , 20 is a microwave antenna, 21 is a printed circuit board, 22 is a terminal block, and 23 is a sensor case.

 Normal operation is as described above.

When diagnosing the operation, when voltage is applied to the energization control terminal 19, the diode energization circuit 15
14 mA of 2 mA is turned on for 1 second at 0.3 second and 0.7 second off. Since a part of the microwave is reflected when it is turned on, a 1 Hz signal is obtained and the microwave detection signal is sent to the output logic circuit 9.

At the same time, the resistor energization circuit 17 connects the resistor 16 to the resistor 16
The power is turned on for 8 seconds and turned on for 2 seconds so that 200 mW of power will be consumed. Due to this power consumption, the resistor 16 generates heat and becomes higher than the radiation temperature in the background of the field of view of the PIR element 5,
Above the predetermined level, a PIR detect signal is obtained.

If you select a resistor 16 with good radiation efficiency on the surface,
A detection signal can be obtained even at 200 mW or less.

 The PIR detection signal is sent to the output logic circuit 9.

When the microwave detection signal and the PIR detection signal overlap, the output logic circuit 9 sends the detection output signal to the output terminal 10 by logical product.

It can be confirmed that the above operation works properly.

When installed in the entrance of each room such as a large building to monitor an unexpected intruder into the room, the diode energizing circuit 15 and the resistor energizing circuit 17 automatically switch intermittently and periodically. When the configuration is such that electricity is supplied to the resistor 14 and the resistor 16, labor can be saved, and a deteriorated function can be immediately detected.

[Advantage of Device] As described above, according to the present invention, it is easy to diagnose whether or not the device is operating normally, which contributes to labor saving and causes an accident without noticing the deterioration of the function of the detector. There is no such thing.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of the present invention, FIG. 2 is a perspective view showing an arrangement state of diodes, resistors, etc. of an embodiment of the present invention, and FIG. 3 is a conventional motion of this kind. FIG. 4 is a block diagram showing the structure of an example of the detector.
It is explanatory drawing which shows the detection area of the detector of the figure. 1 ... Microwave Doppler module, 2 ... Amplifier, 3 ...
Band-pass filter, 4 ... Level determiner, 5 ... PIR element, 6 ...
Amplifier, 7 ... Band filter, 8 ... Level determiner, 9 ... Output logic circuit, 10 ... Detection output terminal, 11 ... IR lens, 12 ...
Stabilized power supply, 13 ... Power input terminal, 14 ... Switching diode, 15 ... Diode energizing circuit, 16 ... Resistor, 17 ... Resistor energizing circuit, 18 ... Timer, 19 ... Energization control terminal, 20 ... Microwave antenna, 21 … Printed circuit board, 22…
Terminal block, 23… Sensor case. In the drawings, the same reference numerals indicate the same or corresponding components.

Claims (2)

[Scope of utility model registration request] 1. A motion detector for detecting a moving object, which is a combination of a microwave Doppler sensor and a pyroelectric infrared sensor, in which a diode is arranged in front of an antenna of a microwave Doppler element and the energization of the diode is remotely controlled. Is provided, a resistor is arranged in front of the pyroelectric infrared element, a circuit for remotely controlling the energization of the resistor is provided, and the above-mentioned diode is remotely controlled to diagnose whether or not the motion detector is operating normally. A motion detector characterized by having a structure that can be performed by energizing the resistor with a resistor. 2. A circuit for remotely controlling energization of a diode,
It is possible to intermittently and regularly energize a diode and a resistor in a circuit for remotely controlling energization of a resistor, and to diagnose whether or not the motion detector is normally operating while operating the motion detector. The motion detector according to claim 1, wherein the motion detector has a structure that enables the motion detector.