JP3287766B2 - Human body detection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a human body detecting device. More specifically, the present invention relates to a new human body detection device capable of detecting a human body with high reliability not only indoors but also outdoors.

[0002]

2. Description of the Related Art Conventionally, as a passive human body detecting device for automatically detecting a human body, a pyroelectric infrared sensor,
2. Description of the Related Art A detection device provided with a sensor such as an ultrasonic sensor, a microwave sensor, and a distance measurement sensor is known. In a pyroelectric infrared sensor detection device, an object in a detection target area is detected by a pyroelectric infrared sensor, and an object in the detection target area is detected as a human body by using a pyroelectric waveform obtained from the detection signal. .

[0003] Ultrasonic sensor detection devices include, for example, a pulse reflection time measurement type and a Doppler effect type.
The pulse reflection time measurement type ultrasonic sensor detection device emits an ultrasonic wave having a specific transmission pulse into the detection target area, and detects the reflected ultrasonic wave reflected by the object in the detection target area by the ultrasonic sensor. Then, the object in the detection target area is detected as a human body by using a time difference measured from the reflected ultrasonic pulse and the transmitted ultrasonic pulse, that is, the reflection time.

On the other hand, the Doppler effect type ultrasonic sensor detecting device utilizes the Doppler effect generated between the radiated ultrasonic wave and the reflected ultrasonic wave generated by the object in the detection target area to detect the object within the detection target area. Is detected as a human body. In addition, there are various types of microwave sensor detection devices depending on how microwaves are used.

For example, a Doppler effect type microwave sensor detecting device detects a human body by utilizing a Doppler effect generated between a radiated microwave and a reflected microwave of an object in an area to be detected with respect to the radiated microwave. Since this microwave sensor human body detection device uses microwaves, when the device is used outdoors, rain,
Due to its extremely low dependency on natural environment fluctuation factors such as snow and wind, it has the feature that it can detect objects in the detection target area as a human body with higher accuracy than an ultrasonic sensor detection device using ultrasonic waves ing.

There are various types of distance measuring sensor detecting devices. For example, a Doppler effect type distance measuring sensor detecting device utilizes a Doppler effect generated between radiated infrared light and reflected infrared light by an object in a detection target area with respect to the radiated infrared light to detect a position detected in a distance measuring sensor. The distance between the distance measuring sensor and the arbitrary object is measured by an element (PSD), and the object in the detection target area is detected as a human body by using the measured distance.

[0007]

However, each of the above-mentioned conventional human body detection devices has a problem to be solved in terms of detection accuracy and the like. That is, in the pyroelectric infrared sensor detection device, as illustrated in FIG. 10, detection such as invasion of a small animal (c) such as a dog or a cat, or shaking of a flowering plant, a high branch (a), a laundry, or the like is performed. When the behavior of the obstacle occurs in the detection target area (d), depending on the behavior speed and position of the detected obstacle, the pyroelectric waveform obtained from the detection signal may indicate, for example, S / S corresponding to human behavior.
In the case of performing detection by threshold processing using the N ratio as a threshold,
As illustrated in FIG. 11, the S / N ratio of the pyroelectric waveform corresponding to the behavior of the detected obstacle is the S / N of the pyroelectric waveform corresponding to a human.
It may be very close to the ratio. For this reason, there has been a problem that the detection obstacle cannot be deleted by the threshold processing and the detected obstacle is erroneously detected as a human body.

Further, in the ultrasonic sensor detecting apparatus of the pulse reflection time measuring type, as shown in FIG. 12, dead leaves, birds, tall branches (a), laundry When a detection obstacle such as enters the detection target area (D), the pulse signal of the ultrasonic wave reflected by the detection obstacle is erroneously determined to be a pulse signal of a human, as illustrated in FIG. Sometimes. For this reason, when a detection obstacle enters a position higher than the height of a human, the pulse signal of the ultrasonic wave reflected by the detection obstacle is used earlier by the ultrasonic sensor than the pulse signal of the ultrasonic wave reflected by the human body. Since the detection obstacle is detected, there is a possibility that the detection obstacle is erroneously detected as a human body without being identified as the detection obstacle, and there is a problem that the detection accuracy is lowered.

Also, in the Doppler effect type ultrasonic sensor detecting device, the Doppler effect type microwave sensor detecting device, the Doppler effect type distance measuring sensor detecting device, etc., the above-described pyroelectric infrared sensor detecting device is used. Similar to the problem and the problem of the pulse reflection time measurement type ultrasonic sensor detection device, there is a high possibility that a detection obstacle in the detection target area is erroneously detected as a human body, and the detection accuracy of the human body is extremely high. There was a problem such as low.

Furthermore, the conventional human body detecting device can detect the behavior itself of the object in the detection target area, but cannot identify whether the behavior is the behavior of a human body. . This is also a cause of frequent false detection of the detected obstacle. The present invention has been made in view of the above circumstances, and identifies and detects an object in a detection target area as a human body with little false detection and high reliability not only indoors but also outdoors. It is an object of the present invention to provide a new human body detection device capable of performing such operations.

[0011]

According to the present invention, there is provided a human body detecting apparatus for detecting an object in a detection target area as a human body, comprising one or a plurality of ultrasonic waves. A human body identification and verification process using a sensor or a ranging sensor, one or more pyroelectric infrared sensors, and a detection signal from the ultrasonic sensor or ranging sensor and a detection signal from the pyroelectric infrared sensor. a signal processor for performing and is provided, the signal processor includes an ultrasonic
For a certain period of time from the detection signal from the sensor or ranging sensor
Measure the height of the object at every interval and measure the height within the specified height range
The object as a human body when the duration is longer than the specified time
Signal from the detection signal of the pyroelectric infrared sensor.
Measure the frequency, and change the
Object behavior when humanization occurs
In addition, the human body identification signal and the human
The object is identified by a logical product with the body behavior identification signal.
Providing human body detecting apparatus characterized that you test to be the body.

[0012] The present invention also provides the above apparatus,
One of the embodiments is to provide an alarm which operates according to the output signal of the signal processor .

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION As described above, a human body detecting device according to the present invention includes one or more ultrasonic sensors or distance measuring sensors,
It has a structure provided with at least one pyroelectric infrared sensor and a signal processor. In the human body detection device of the present invention having such a structure, each ultrasonic sensor or distance measuring sensor The object is identified as a human body by using the height of the object in the detection target area obtained from the detection signal, and the pyroelectric wave for the behavior of the object in the detection target area obtained from the detection signal from each pyroelectric infrared sensor By using the shape, the behavior of the object is identified as the behavior of the human body, and furthermore, the logical product of the human body identification signal obtained by these identifications and the human body behavior identification signal, that is, AND is established, and finally the object is regarded as a human body. Detect.

Actually, each processing by the signal processor for the detection signal of each sensor is performed, for example, as illustrated in FIG. FIG. 1 exemplifies a process of an identification process and a verification process by a signal processor in a human body detection device according to the present invention. The human body detection device includes two ultrasonic sensors and two pyroelectric infrared sensors. This is a processing step when is provided.

FIG. 2 shows a specific processing example performed in the height measurement processing in the processing process illustrated in FIG. In the height measurement process for the detection signal by the ultrasonic sensor, first, a signal detected by the ultrasonic sensor, that is, a pulse signal of the reflected ultrasonic wave by the object with respect to the ultrasonic wave radiated in the detection target area, By performing level determination as processing, minute pulses having a level value equal to or less than a preset level value are deleted, and only pulses larger than the set level value are left. Then, the time difference between the leading pulse in the pulse signal subjected to the level determination and the pulse signal of the radiated ultrasonic wave, that is, the reflection time, is measured, and using the measured reflection time, for example, the ground or concrete surface by the following equation The height b of the object from the reference plane is calculated.

[0016]

(Equation 1)

In this equation, C is the sound wave propagation velocity in air at a temperature t ° C., Tk is the measured reflection time, k is the distance between the ultrasonic sensor and the highest point of the object, and the sensor height h is a reference. This is the distance between the surface and the ultrasonic sensor. However, it is assumed that the sensor height h is arbitrarily set in the signal processor in advance, for example. Such height measurement processing is performed at fixed time intervals, and the human body identification processing is performed on the height of the object measured at each fixed time interval.

In this human body identification processing, whether the measured height of the object at each fixed time interval is within a specified height range defined by a preset upper and lower limit height, and It is determined whether or not to continue for the number of intervals or more, and if it is within the specified height range and continues for the specified time or more, the object is identified as a human body. The set height range at this time is set, for example, to a range that approximates the height of a human.

The determination as to whether or not the measured height within the specified height range continues for a specified time or longer is made, for example, as follows. First, when the height within the specified height range is measured, the n measured heights including the measured height are defined as one frame, and the frame is sequentially divided into n measured heights.
In each frame, the n measurement heights b are compared, and the maximum measurement height b _max , and the number m of b _max in one frame are detected. The measurement height b, the number n, the maximum height b _max of the measurement height b, the maximum number of height b _max m
And the average height b of the measured heights according to the following equation:
Calculate _ave .

[0020]

(Equation 2)

Normally, it is considered that there is little variation in the height of the human body in the detection target area. Thus, by subtracting the steep variation in the measurement height, the height of the human body in the detection target area is smaller than the human height in the detection target area. It is possible to eliminate steep behavior of a detection obstacle such as a tall branch at a high position or a swing of laundry. Furthermore, for example, than the average height b _ave of each frame, the same average height b _{av e} is the case of continuing or number of frames has been set in advance, measuring the height of within a specified height range specified time or continuously It is determined.

As described above, the human body is not identified only based on the height of the object, but the time in the detection target area of the object is also considered at the same time as the height. Since such erroneous detection of activities of daily living can be suppressed, the existing object can be more accurately identified as a human body. Then, such a human body identification process is performed on each of the detection signals of the two ultrasonic sensors, for example, and a human body identification signal having a signal level representing the human body identification is output only when the object is identified as a human body.

FIG. 3 shows a specific processing example performed in the pulse signal shaping processing in the processing process illustrated in FIG. In the pulse signal shaping process for the detection signal by the pyroelectric infrared sensor, first, a pyroelectric waveform is formed from a signal from an object in the detection target area detected by the pyroelectric infrared sensor, and the pyroelectric waveform is formed. Each wave is amplified, and a wave having a frequency other than the frequency corresponding to the moving speed of the human being is deleted by the filtering process.
With this filter processing, if there is a wave corresponding to the behavior of the object that approximates the moving speed of the human, the behavior of the object can be detected as the behavior of the human body.

However, among detection obstacles such as small animals and tall branches, there are naturally those which behave similarly to the moving speed of a human. Therefore, in order to prevent erroneous detection due to such detection obstacles, Further, it is necessary to perform a behavior identification process. A level determination process and a pulse signal shaping process are performed as preprocessing of the behavior identification process.

The pyroelectric waveform that has been subjected to the amplification and filter processing is subjected to, for example, a level determination as a threshold processing so that the maximum value of each wave constituting the pyroelectric waveform is set to a preset level value. Detect larger waves. In each of the waves detected by the level determination, the maximum width of the mountain portion having a value larger than the set level value is set as the individual pulse width, and the interval between the maximum widths of adjacent waves is set as each pulse width. The pulse signal is shaped on the time axis by setting the interval to.

Then, behavior identification processing is performed on the pulse signal. First, in this pulse signal, a pulse width T _refn generated by the behavior of the object and a pulse width T _n in a state where no intruding object exists in the detection target area.
Is calculated by the following equation.

[0027]

(Equation 3)

[0028] Then, a difference between the threshold T _s for the difference absolute value and preset behavior identified, the difference value,

[0029]

(Equation 4)

In the case of, it is determined that the behavior of the object is irregular, and the difference value is

[0031]

(Equation 5)

If so, it is determined that the behavior of the object has regularity. This operation for behavior determination is performed, for example, for each frame by dividing the pulse signal into n-pulse period frames as one frame. At this time, _if the pulse width of _Trefn or _Tn is longer than one frame, for example, the calculation is performed using the pulse width in the next frame.

The behavior of the intruding object is identified from the obtained regularity / irregularity of the behavior of the object for each frame. Normally, human behavior does not have many regular behaviors such as high branches and laundry swaying, and irregular behaviors are considered to occupy the majority. For this reason, irregular behavior of humans appears as pulse disturbance in the pulse signal, that is, irregularity.

Therefore, the comparison of each pulse width of the pulse signal is as follows.

(Equation 6) The behavior of the object is identified as the behavior of the human by the determination of the irregularity of the behavior of the object depending on the case. By applying such signal processing to the behavior of an object, it is possible to more accurately identify the behavior of the object as a human behavior by removing a detection obstacle that performs a regular behavior that does not exist in the human behavior. Can be.

This object behavior identification processing is performed for each of the two pyroelectric infrared sensors, for example.
Only when the behavior of the object is identified as the behavior of the human body, a human behavior identification signal having a signal level indicating the human behavior identification is output. In the signal processor in the apparatus according to the present invention, for example, a combination of an AND circuit and an OR circuit for the human body identification signal and the human body behavior identification signal obtained by the identification processing on the detection signal of each sensor as described above. Is used to perform a logical product test process for testing the logical product of two signals, that is, the establishment of AND.

FIG. 4 shows the AN in the logical product test process.
1 illustrates a D / OR logic circuit. In the test process by the AND / OR logic circuit shown in FIG. 4, first, a human body identification signal obtained by a human body identification process with respect to a detection signal of each ultrasonic sensor is input to an OR circuit, and among the input human body identification signals, If at least one signal having a signal level representing the human body identification is obtained, OR is established,
The OR establishment signal is sent to the next AND circuit. Further, the human body behavior identification signals obtained by the behavior identification processing for the detection signals of the pyroelectric infrared sensors are respectively input to an OR circuit different from the OR circuit for the human body identification signal, and the human body identification signal is included in the input behavior identification signals. When at least one signal having a signal level indicating behavior identification is obtained, OR is established, and an OR established signal is output and sent to the next AND circuit. And this A
When both the OR establishment signal for the human body identification signal and the OR establishment signal for the human body behavior identification signal are input to the ND circuit, AND is established, and an AND established signal is output.

As described above, by mutually validating the identification signals obtained from the individual sensors using the AND / OR circuit, it is possible to detect an intruding object in the detection target area as a human body with extremely few errors. Can be done accurately. The process shown in FIG. 5 shows the process in the case where the human body detecting device of the present invention is provided with an ultrasonic sensor. However, the distance measuring sensor incorporating the position detecting element (PSD) is not shown. Even if it is provided, it is needless to say that the same effect can be obtained by measuring the height by the distance measuring sensor at regular time intervals and performing human body identification processing on each measured height value. No.

Further, the human body detecting device of the present invention is provided with, for example, a siren device that emits a peculiar continuous / intermittent sound, a lighting device or a flash light device that emits red light, and the like. An alarm may be provided and such an alarm is controlled to operate according to the output signal from the signal processing device, such as to be activated by an AND output signal of a logic circuit processing in the signal processing device. Preferably.

Hereinafter, examples will be shown, and embodiments of the present invention will be described in more detail. Of course, the present invention is not limited by the following examples.

[0040]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A human body detection device according to the present invention was installed at the eaves of a house, and detection and identification of an intruding object into an area to be detected by the human body detection device were performed. FIG. 5 shows a conceptual diagram when a human body detection device according to an embodiment of the present invention is installed at the eaves. In FIG. 5, the human body detection device (1) of the present invention is provided with two ultrasonic sensors (2) and two pyroelectric infrared sensors (3). It is assumed that the swing of 7) and the human (6) are present. This sway of Takae (7) is caused by human (6)
At a position higher than the height of the person (6) at a speed approximating the moving speed of the human (6).

First, in a state where only the swing of the tall branch (7) exists in the detection target area, a signal for the swing of the tall branch (7) in the detection target area is detected by the ultrasonic sensor (2). From the ground of the high branch (7) (8)
Is measured at regular time intervals. FIG.
FIG. 5 illustrates eight measurement heights b for one frame, where the height value d is the height of the ground (8) shown in FIG. 5 and the height value e is the swing height of the tall branch (7). It is. Comparing these eight measurement heights, the height value e, which is the height of the swing of the tall branch (7), becomes the maximum height b _max , so the average height b _ave in this frame is:

[0042]

(Equation 7)

Thus, the height d of the ground is obtained. Therefore, the behavior of the high branch (7) is deleted, and the average height b _ave does not fall within the specified height range. Therefore, it is not necessary to determine whether or not to continue the specified time interval, which is the next identification processing. , Takae (7) is identified as not a human body. After that, it is assumed that the human (6) enters the same area in a state where the twig (7) sways in the detection target area. That is, the state where the swing of the tall branch (7) and the human (6) are present simultaneously in the detection target area.

In this state, as described above, the height of the person is measured at regular time intervals from the detection signal of the ultrasonic sensor (2) shown in FIG. FIG. 7 exemplifies eight measurement heights b for one frame at this time. The height value e is the height of the swing of the high branch (7), and the height value f is the human (6). ) Height. Comparing these eight calculated heights, the height value e indicating the swing of the tall branch (7) at a position higher than the human (6) becomes the maximum height b _max, and thus the average height b _ave in this frame. Is

[0045]

(Equation 8)

As a result, the height of the human becomes f. Therefore, the steep behavior of the high branch (7) is deleted, and the average height b _ave falls within the specified height range. If the same person (6) continues to exist in the detection target area, the average height b _ave for each frame becomes the height value f, and the average height b of this height value f is calculated in the same manner as in the calculation using the above equation. _{If ave} continues for a predetermined number of frames or more, it is determined that the measurement height within the specified height range has continued for the specified time or longer.

In accordance with this determination, a human body identification signal having a signal level representing the human body identification is output. On the other hand, for the pyroelectric infrared sensor (3) shown in FIG. 5, the identification process is performed simultaneously with the identification process for the ultrasonic sensor (2). First, in a state where only the swing of the high branch (7) exists in the detection target area, a signal corresponding to the behavior of the high branch (7) is detected by the pyroelectric infrared sensor (3), and a pyroelectric waveform obtained from the detection signal is obtained. Are subjected to filter processing for amplifying the individual waves constituting the above and removing waves having a frequency other than the frequency corresponding to the moving speed of the human. However, in this processing, the wave corresponding to the behavior of the high branch (7) is not deleted because the swing of the high branch (7) is a behavior that approximates the moving speed of the human.

Next, among the individual waves constituting the pyroelectric waveform after the amplification and filter processing, a wave whose maximum value is larger than a preset level value is detected, and a pulse signal is formed from the detected individual waves. . FIG. 8 illustrates a pulse of one frame in the shaped pulse signal.
As is clear from FIG. 12, in this frame, the pulse widths T _{ref1 to} T _ref4 corresponding to the behavior of the high branch (7) and the pulse widths T _{1 to} T in a state where no high branch exists in the detection target area. _It can be seen that ₄ and ₄ appear alternately in order, that is, regularity appears in the pulse.

Normally, it is considered that the sway of the tall branches has a regularity. Since the regularity of the sway of the tall branches appears in the detection signal of the pyroelectric infrared sensor, as shown in FIG. The pulse signal also has regularity. In this pulse signal, the difference absolute value between T _{ref1 to} T _ref4 and T _{1 to} T ₄ is

(Equation 9) Calculated and is compared with the difference absolute value and setting the threshold value T _s, the

[0050]

(Equation 10)

The following relationship holds. Therefore, it is determined that the behavior has regularity, the behavior of Takae (7) is identified as not the behavior of the human body, and the behavior identification signal having the signal level indicating the human body behavior identification is not output. After that, it is assumed that the human (6) enters the same area in a state where the twig (7) sways in the detection target area. That is, the sway of the high branch (7) and the human (6) are present simultaneously in the detection target area,
In addition, the high branch (7) exists at a position higher than the height of the person (6).

In this state, as described above, the pyroelectric waveform obtained by the detection signal from the pyroelectric infrared sensor (3) is subjected to amplification / filtering and level determination to form the pyroelectric waveform after the processing. The pulse signal is shaped from the individual waves to be generated. FIG. 9 illustrates a pulse for one frame in the shaped pulse signal. This figure 9
, T ₂ , T _ref3 , T ₃ , T
_ref4, pulse width of T ₄ is, it is understood that the irregular. This irregularity is apparent from comparison with the pulse signal in the case where only the swing of the high branch shown in FIG. 8 exists.

Normally, it is considered that irregular behavior occupies most of the human behavior rather than regular behavior such as the behavior of a high branch. Since it appears in the detection signal of the electric infrared sensor, the pulse signal also has irregularities as shown in FIG. In this pulse signal, T _{ref1 to} T _ref4
The absolute value of the difference between the the T ₁ ~T ₄ and,

[Equation 11] Calculated and is compared with the difference absolute value and setting the threshold value T _s, the

[0054]

(Equation 12)

The following relationship holds. Therefore, it is determined that the behavior of the object has irregularities, the behavior of the human body can be identified, and a behavior identification signal having a signal level indicating the behavior identification is output. Such identification processing is performed for each of the two ultrasonic sensors (2) and the two pyroelectric infrared sensors (3) to obtain two human body identification signals and two behavior identification signals.

Next, by using a logic circuit composed of a combination of an AND circuit and an OR circuit for each of the human body identification signal and each behavior identification signal, the logical product of two signals, that is, AND Test for success. In the identification processing for the ultrasonic sensor (2), since a human body identification signal having a signal level indicating human body identification is output, OR in the OR circuit is established, and an OR establishment signal is output to the AND circuit. Also, in the identification processing for the pyroelectric infrared sensor (3), since the behavior identification signal having the signal level indicating the human body behavior identification is output, OR in the OR circuit is established, and the OR establishment signal is A.
Output to the ND circuit. And, in the AND circuit, since two OR establishment signals are input, AND is established,
An AND establishment signal is output.

As described above, by mutually validating the identification signals obtained from the individual sensors using the AND / OR circuit, the detection of the intruding object in the detection target area as a human body is performed with extremely few errors. be able to.

[0058]

As described in detail above, according to the present invention, a new human body detecting device capable of detecting an object in a detection target area as a human body with high reliability not only indoors but also outdoors. Provided.

[Brief description of the drawings]

FIG. 1 is a diagram exemplifying a discrimination process and a test process by a signal processor in a human body detection device of the present invention.

FIG. 2 is a diagram illustrating a specific process performed in a height measurement process in the process illustrated in FIG. 1;

FIG. 3 is a diagram illustrating a specific process performed in a pulse signal shaping process in the process illustrated in FIG. 1;

FIG. 4 shows an AND in the logical product test process illustrated in FIG. 1;
FIG. 3 is a diagram illustrating a / OR logic circuit;

FIG. 5 is a conceptual diagram illustrating a case where a human body detection device according to an embodiment of the present invention is installed at the eaves of a house.

FIG. 6 is a diagram exemplifying a measured height for one frame in a state where only the swing of a high branch is present in a detection target area;

FIG. 7 is a diagram exemplifying a measured height for one frame in a state where a sway of a high branch and a human are present simultaneously in a detection target area;

FIG. 8 is a diagram exemplifying a pulse signal for one frame in a state where only high branch swings exist in the detection target area;

FIG. 9 is a diagram exemplifying a pulse signal for one frame in a state where a sway of a high branch and a human are present simultaneously in a detection target area.

FIG. 10 is a diagram illustrating a state where small animals and tall branches are present in a detection target area;

FIG. 11 is a diagram exemplifying a pyroelectric waveform obtained from a detection signal of a pyroelectric infrared sensor in a state where small animals and tall branches are present.

FIG. 12 is a diagram exemplifying a state where a high branch and a person are present in a detection target area;

FIG. 13 is a diagram exemplifying a pulse signal obtained from a detection signal of an ultrasonic sensor in a state where a high branch and a human are present.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Human body detection device 2 Ultrasonic sensor 3 Pyroelectric infrared sensor 4 Signal processor 5 house ahead 6 Human 7 Takaeda 8 Ground

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-263192 (JP, A) JP-A-6-24258 (JP, A) JP-A-5-325052 (JP, A) JP-A-4-243 98598 (JP, A) JP-A-4-164217 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G01V 8/12 G01V 1/00 G01V 11/00 G08B 13/16

Claims (2)

(57) [Claims] 1. A human body detecting device for detecting an object in a detection target area as a human body, comprising one or more ultrasonic sensors or ranging sensors, and one or more pyroelectric infrared rays. Sensor, and a signal processor for performing identification and verification processing of the human body using the detection signal of the ultrasonic sensor or the distance measurement sensor and the detection signal of the pyroelectric infrared sensor , the signal processor, Detection by ultrasonic sensor or ranging sensor
Measure the height of the object at fixed time intervals from the knowledge signal and specify
When the measurement height within the height range continues for more than the specified time
Identifies an object as a human body and uses a pyroelectric infrared sensor
Signal frequency from the detected signal
When the change more than the constant frequency change occurs,
Identified as body behaviors, and
AND of the human body identification signal and the human body behavior identification signal
By standing, human body detecting device according to claim that you test objects to be human. 2. The human body detecting device according to claim 1, further comprising an alarm which operates according to an output signal of the signal processor .