KR20160139607A - A human body sensing device using doppler sensor - Google Patents

Abstract

A human body sensing control device to distinguish a human and an animal by using a Doppler sensor includes: a condensing lens (1) condensing a thermal infrared ray of a human or animal; a filter (2) filtering the wavelength of the condensed thermal infrared ray; a Doppler sensor (3) generating a signal through infrared energy; a low-pass filter (4) removing a high frequency noise of a detection signal; an amplifier (5) amplifying the signal; a microcomputer (8) setting a sampling time to sample and hold the signal through the amplifier (5), setting a threshold range by a variation of thermal energy distribution, changing depending on a surrounding temperature, and generating an output signal if a TTL signal exceeds a fixed coefficient; a converter (7) digitizing an analogue signal; a differentiator (9) generating a positive pulse if an inputted analogue signal value exceeds a set value; and a TTL conversion circuit (10) converting the positive pulse by the differentiator (9) into a TTL signal.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a human body sensing device using a Doppler sensor,

The present invention relates to a human body detection and control apparatus for distinguishing between humans and animals using a Doppler sensor. In particular, when a moving object enters a certain monitoring area, The present invention relates to a human body detection and control apparatus that distinguishes between a human and an animal using a Doppler sensor that continuously keeps a sensed signal without a timer and ends the signal when it disappears.

Some human body detection and control devices that detect the human body have been developed and used in the present. For example, in the case of domestic, the human body is detected by the change of the infrared energy or the human body is detected in the dark room, Or a method of pointing and extinguishing an illumination light by sensing a human body every timer cycle is mainly used.

Such a human body detection and control apparatus in domestic is not accurate enough to discriminate whether it is a human or an animal, so that there is a lot of malfunction due to an erroneous detection signal, and accordingly, electricity is wasted when applied to an illumination lamp.

In Japan, a human body detection and control device has been developed and marketed. A brief description of the method is as follows: a method of detecting the presence of a person by the difference between infrared rays and background, a method of detecting a human body and a small animal according to a change in the direction of infrared ray incidence And sensing technology that distinguishes between humans and animals using two infrared light-receiving sensors.

Such Japanese technology has a disadvantage of high production cost because it requires the use of images.

It is an object of the present invention to provide a human body sensing apparatus capable of greatly improving reliability by clearly distinguishing between human beings and an animal, thereby minimizing waste of electric power in the case of an illumination light, The object of the present invention is to provide a human body detection and control apparatus that distinguishes between a human and an animal using a Doppler sensor capable of preventing operation and detecting at a very long distance.

In order to accomplish the above object, a human body detection and control apparatus for distinguishing between humans and animals using the Doppler sensor of the present invention comprises a detector for detecting thermal infrared rays of a moving object, And generates a signal, the human body detection control apparatus comprising: A condenser lens for condensing thermal infrared rays of a person or an animal; A filter for filtering the wavelength of the condensed thermal infrared rays; A Doppler sensor for generating a signal by infrared energy; A low-pass filter for removing high-frequency noise of a detection signal; An amplifier for amplifying the signal; A sampling time is set so as to sample / hold a signal through the amplifier and a threshold value is set by a variation amount of a thermal energy distribution amount depending on an ambient temperature. When the TTL signal exceeds a predetermined coefficient A microcomputer for generating an output signal; A converter for digitizing the analog signal; A differentiator for generating a positive pulse when an input analog signal value exceeds a set value; And And a TTL conversion circuit for converting a positive waveform by the differentiator into a TTL signal, Infrared rays of a moving object entering the monitoring area are sensed to discriminate between a person and an animal, and an output signal is generated only when the person is a person.

As described above, the present invention can detect a moving object within a wide and a long distance range within a monitoring area to clearly distinguish between a person and an animal, thereby preventing many problems such as power and manpower waste due to oboe This is an excellent invention that can be used in a wide range of fields such as security devices, automatic lighting devices, and industrial automation.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a human body detection and control apparatus for distinguishing between humans and animals using a Doppler sensor of the circuit diagram of the present invention. FIG.
FIG. 2 is a chart showing human body detection signals and output signals according to the present invention. FIG.

A condenser lens 1 is installed so as to face a region to be monitored and a filter 2 for filtering the wavelength of thermal infrared rays condensed by the condenser lens 1 is formed. And a Doppler sensor 3 for generating a signal by receiving infrared energy through the Doppler sensor 3.

There is provided an amplifier 5 for amplifying a signal by connecting a low pass filter (LPF) 4 for eliminating high frequency noise of the detection signal.

       The signal through the amplifier 5 is passed through a converter 7 for digitizing an analog signal and then connected to a microcomputer 8. The microcomputer 8 sets the time for sampling the signal passed through the amplifier 5 by the sampling / holding circuit 6 and sets the threshold value by the variation amount of the thermal energy distribution amount depending on the ambient temperature ). When the TTL signal (Transistor Transistor Logic Pulse) exceeds the predetermined coefficient, the output signal is generated.

When the analog signal value input through the amplifier 5 exceeds a value set by the microcomputer 8, a differentiator 9 for generating a positive pulse is provided, And a TTL conversion circuit 10 for converting a positive (+) waveform into a TTL signal.

As shown in FIG. 1, when a moving object enters the inside of the monitoring space, the infrared rays emitted by the object are condensed through the condenser lens 1, And is detected by the Doppler sensor 3 through the filter 2.

The signal detected by the Doppler sensor 3 is amplified by the amplifier 5 after the high-frequency noise is removed by the low-pass filter 4 and is then sampled and held at the sampling time set by the microcomputer 8 6 are sampled and then converted into digital data by a converter 7 (A / D converter).

This is the background heat distribution coefficient Q ₀ in FIG. 2. Such a Q ₀ is maintained in a certain range as shown in FIG. 2 unless there is an intrusion of another object in the background heat distribution. However, when a person enters the monitoring area, The background is added to the thermal energy.

Since the variation amount of the amount of heat energy distribution varies greatly according to the ambient temperature, the limit range setting should be appropriately set according to the ambient temperature, and such adjustment is processed by the microcomputer 8.

In FIG. 2, the lower case q ₀ is an analog signal, and the digital data converted by the converter 7 is represented by Q ₀ , that is, an upper case letter.

The signal (analog) q of the Doppler sensor 2 rises as shown in Fig. 2 due to intrusion of a human body into the boundary region.

When the rise of q begins to increase _beyond the value of q _th , the time differentiator 9 starts to operate.

When the q increases with time, a positive pulse is generated in the time differentiator 9 and the pulse is converted into a TTL signal by the TTL conversion circuit 10 and input to the microcomputer 8.

The microcomputer 8 counts by a coefficient set by this pulse, and counts more than this coefficient, it is regarded as an appearance of a human body, not an error.

At the same time, a new heat distribution coefficient Qi is calculated for each sampling time set by the microcomputer 8, and this Qi is compared with the previous heat distribution coefficient Qi _-1 to calculate the increase / decrease.

ΔQ = (Qi - Qi _-1 ) When SR is established, it is assumed that there is no change in Q. Where R is the margin of error.

Q (t) rises due to the appearance of a human body in the surveillance region, the exceeding of the limit range level qth and the continuing rise in the heat distribution coefficient cause a new background row Q _A to flow through the amplifier 5, the sample hold 6, ) As a signal path of the microcomputer.

In this process, since the microcomputer 8 has passed the predetermined calculation of the TTL signal generated by the microcomputer 9 and the microcomputer 8, it is regarded as an appearance of the human body, not an error, And outputs the same output signal.

When a person exits the surveillance zone, the new Q value begins to decrease and when the q signal continues to decrease to the qth limit, a negative pulse is generated in the differentiator (9) The negative pulse is converted into a TTL signal and input to the microcomputer 8. The microcomputer 8 counts a predetermined number of times to recognize that the human body is out of the surveillance region. At this time, the output signal of FIG. 2 (C) I will.

In this method, the continuous calculation of the heat distribution coefficient and the TTL signal derived from the differentiator 9 are performed without using a timer, and the input / output time of the counted human body is detected and turned on and off automatically.

The following parameters can be assumed as an example for deriving a decision logic constant that can identify a human body and an animal, which are important core technologies in the present invention.

Figure 1.

In Figure 1, Vpp (peak-to-peak sensing voltage) is proportional to body temperature and volume of the organism. That is, since the volume of the human body is generally larger than the volume of the animal, the infrared infrared energy radiated from the human body at rest is larger than the infrared infrared energy emitted from the animal, so that Vpp detected by human body detection is V ' pp.

In Figure 2 below, V'pp is the detection voltage when the animal is detected, and if the threshold voltage V _T (Threshold Voltage) is set higher than V'pp, it is possible to eliminate the animal's error.

Figure 2.

The thermal infrared energy sensing signal emitted from a moving human body or animal changes with the α value shown in Figure 1 depending on the speed of the moving organism. α represents the rate of increase of the thermal sensed signal and represents dv / dt.

That is, the heat sensed signal detected from a fast moving organism will display a fast signal increase rate.

Figure 3.

In Figure 3, α is the signal slope of a fast moving organism and α 'is the signal slope of a slow moving organism.

Also, the speed can be differentiated by the value of Tt, which is the time derived from the cut-off voltage.

In Figure 3, Tt is the time calculated by V _T from the fast-moving organism and _T t is the time calculated by the preset cut-off voltage V _T for the infrared infrared energy sensing signal of the slow moving object. Since Tt is smaller than Tt, it is possible to distinguish the speed of a moving object.

The distinction between the human and the animal of the organism that enters the detection zone can be distinguished by the values of Vpp, alpha, and Tt by analyzing the waveform of the detected infrared infrared energy signal.

In other words, it can be assumed that the movement of an animal is generally faster than that of a person, and that a thermal infrared detection signal is smaller than that of the human body.

Misbranding due to natural movement of leaves, such as fallen leaves and other surrounding objects, is all prevented by preventing misuse by the above-mentioned animals.

1: condenser lens 2: infrared wavelength filter
3: Doppler sensor 4: Low pass filter (LPF)
5: Amplifier 6: Sampling and holding circuit
7: Converter 8: Microcomputer
9: differentiator 10: TTL conversion circuit

Claims (1)

A human body detection and control device for detecting thermal infrared rays of a moving object and detecting thermal infrared rays sensed through a light collecting device to distinguish between a person and an animal through a detector,
A condenser lens (1) for condensing thermal infrared rays of a person or an animal;
A filter (2) for filtering the wavelength of the condensed thermal infrared rays;
A Doppler sensor 3 for generating a signal by infrared energy;
A low-pass filter (4) for removing high-frequency noise of a detection signal;
An amplifier 5 for amplifying the signal;
A sampling time is set so as to sample / hold a signal through the amplifier 5, a threshold is set by a variation amount of thermal energy distribution amount depending on the ambient temperature, and a TTL signal is set to a predetermined coefficient A microcomputer 8 for generating an output signal when the output signal exceeds a predetermined value;
A converter 7 for digitizing the analog signal;
A differentiator 9 for generating positive pulses when an input analog signal value exceeds a set value; And
And a TTL conversion circuit 10 for converting a positive waveform generated by the differentiator 9 into a TTL signal,
Wherein a human body and an animal are distinguished by detecting thermal infrared rays of a moving object intruding into a monitoring area, and an output signal is generated only when the person is a human.

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