KR20050074000A - Infrared rays sensor apparatus and sensing method thereof - Google Patents

Abstract

The present invention relates to a heat ray sensor device and a method of detecting the same by providing a microcontroller inside the heat ray sensor device to provide various additional functions. The present invention converts the detection signal detected through the infrared sensor into a digital signal, and based on this, various additional functions may be provided in determining whether the intruder is invaded. First, the microcontroller sets a reference level by using temperature information through the temperature measuring unit, and provides a temperature compensation function by determining whether the intrusion is based on the reference level and the detection signal. In addition, the microcontroller provides a self-diagnostic function for determining an internal abnormality by setting an upper limit reference level and a lower limit reference level. In addition, it provides alarm memory function by storing the intruder's intrusion through the detection signal and providing it at the request of the inspector, and provides convenient walk test function to the inspector through the reed switch or hall IC. In addition, it provides a remote communication with the microcontroller unit of the hot wire sensor device through the wireless communication module unit and the communication module unit. This prevents malfunction and provides an effective and useful heat ray sensor device.

Description

Heated wire sensor device and its detection method {INFRARED RAYS SENSOR APPARATUS AND SENSING METHOD THEREOF}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat ray sensor device and a sensing method thereof, and more particularly, to a heat ray sensor device and a method of detecting the same, which provide various additional functions by embedding a microcontroller inside the heat ray sensor device.

The hot wire sensor device is a device for detecting the presence or absence of a human body in the surveillance region by detecting a change in its value using infrared rays. The hot wire sensor device is divided into two types, active and passive, depending on its operation principle. The active heating sensor device installs the receiver and the transmitter in a fixed place at a certain place and in a certain direction, and receives the infrared light from the transmitter. When an object is inserted between the two, the infrared detection of the receiver disappears. Device. The passive hot wire sensor device is a device that installs only a pyroelectric infrared sensor having a wide viewing angle, and when the human body approaches the viewing angle, the sensor detects a corresponding infrared ray and generates an alarm.

The passive hot wire sensor device having a wide viewing angle is as follows. First, since human body temperature is 36-37 degreeC, the far-infrared ray which has a peak in 8-10 micrometers is emitted. There are two types of sensors for detecting this, a thermal type and a quantum type. Thermotypes operate at room temperature, have no wavelength dependence, are inexpensive, have low sensitivity, and have a slow response. The quantum type has disadvantages such as high sensitivity, fast response, cooling with liquid nitrogen, wavelength dependence and expensiveness. Thermal sensors are used more widely than quantum type because they are inexpensive and require light and thin properties. Specific examples of thermal devices are thermistors, bolometers, thermopiles, and pyroelectric devices. In particular, infrared pyroelectric elements are widely used as security systems.

On the other hand, it is disclosed in the Republic of Korea Patent Publication No. 2000-0024550 (Intelligent Passive Infrared Detector) related to the thermal type and passive type thermal sensor device described above.

1 is a view showing the configuration of a conventional hot wire sensor device of the above-mentioned patent publication, Figure 2 is a view showing the output signal according to the temperature of the infrared sensor in the conventional hot wire sensor device.

As shown in FIG. 1, a conventional heat ray sensor device includes a lens 10 for collecting energy (infrared rays) emitted from a human body, an infrared sensor 20 that receives infrared rays collected through the lens, and converts the infrared rays into electrical signals, and an electrical signal. Determining whether the amplifier 30 to amplify, the filter 40 which is a BPF (Band Pass Filter, 'BPF') to remove the low frequency and high frequency signal components, the comparator 50 to compare with the reference voltage, the human body detects It includes a control unit 60 and an alarm output unit 70 that can inform the outside of the detection situation.

When the intruder enters the surveillance area to be monitored, the amount of change in the infrared energy as much as the background temperature seen by the hot wire sensor device and the temperature difference of the intruder is collected through the lens 10, and the change in the collected energy as shown in FIG. 2. The minute is converted into an electrical signal from the passive infrared sensor 20, in particular, the pyroelectric element, and outputs it. Since the output signal is very weak in mV, it is not suitable for signal processing. Therefore, the amplifier 30 is used in two stages and amplified into a signal having a gain of about 60 to 70 dB. In addition, the low frequency component and the high frequency component are filtered using the BPF filter 40 in consideration of the speed when a person moves the monitoring area, the frequency response characteristic of the infrared sensor 20, and the like. The signal filtered by the BPF filter 40 is compared with the reference level signal using the comparator 50 to determine that the intruder is detected by the controller 60 when the signal is greater than the reference level, and outputs an alarm when the intruder is detected. Inform the outside through the unit 70.

On the other hand, in summer, since the temperature difference between the background temperature and the intruder decreases, it is necessary to change the signal size and judgment criteria according to the temperature change that can be detected even in the small temperature change. In view of this, a function of compensating for temperature is called a temperature compensation function. In the conventional heat ray sensor device as illustrated in FIG. 1, a thermistor 36 is disposed between the first stage amplifier 32 and the second stage amplifier 34 of the amplifier 30. In addition, by changing the magnitude of the output signal transmitted to the comparator 50 by using the change of the resistance value according to the change of temperature to detect the intruder even in the summer temperature is small.

 However, in the conventional heat ray sensor device as shown in FIG. 1, the determination of whether an intruder appears in the monitoring area is determined only by comparing the magnitude of the output signal of the infrared ray sensor with the reference level, so that the temperature change (sunlight, heater, It is easy to malfunction by freezer. In addition, when a small animal (for example, a mouse) roams near a hot wire sensor device, a malfunction due to a small animal occurs because the magnitude of the signal is similar to that of an intruder moving over a long distance.

In addition, in the past, the temperature compensation function was provided using a thermistor. However, when the temperature rises, the resistance value changes only in one direction (up or down). Failure to do so may cause malfunction.

In addition, in the case of the alarm output unit 70, there is an inconvenience to the user by sending a contact output signal or indicating through the LED as a display method of whether the detection was detected. When a plurality of hot wire sensor devices are connected to the same loop at the same time, if a malfunction occurs in one of the sensors, there is no way for the inspector to distinguish which sensor has the malfunction.

In addition, one of the functions used to check the normal operation of the hot wire sensor device when installing or repairing the hot wire sensor device is a walk test function. The hot wire sensor device is installed to use the walk test function in a conventional hot wire device. Open the lid and set the Walk Test Jump Pin, which is very inconvenient for the inspector.

SUMMARY OF THE INVENTION The present invention has been made in an effort to solve the above-mentioned problems of the related art, and to provide a heat ray sensor device and a method of detecting the same, which reduce a change in an external environment and a malfunction caused by a small animal.

In addition, the present invention provides a hot wire sensor device and a method of detecting the same, which properly compensate for temperature compensation and solve a problem in using the Walk Test function.

In addition, to provide a hot wire sensor device having a self-diagnostic function that can be monitored in the event of an internal problem, and an alarm memory function that can distinguish a malfunctioning sensor when several are connected to the same loop. will be.

In addition, by implementing a communication function inside the hot wire sensor device to facilitate the inspection by the inspector wirelessly to provide a hot wire sensor device and a sensing method that can be controlled remotely from the outside.

Hot wire sensor device according to a feature of the present invention for achieving the above object

In the hot-wire sensor device for converting the infrared rays from the surveillance area into an electrical signal, amplified and filtered, and detecting the intrusion of the intruder through the filtered detection signal,

A first analog to digital converter converting the filtered sensed signal into a digital signal;

An ambient temperature measuring unit measuring ambient temperature of the sensing area and transmitting information about the ambient temperature;

A second analog to digital converter converting the information transmitted by the ambient temperature measuring unit into a digital signal;

An intruder by setting a first reference level by using information on the ambient temperature converted by the second analog-digital converter, and comparing the first reference level with the sensed signal converted by the first analog-digital converter. It includes a microcontroller to determine whether the intrusion.

In this case, the microcontroller unit has a larger detection signal converted by the first analog-digital converter than the first reference level, and intrudes an intruder through a time interval between detection times of a larger detection signal and a larger detection signal. It is characterized by determining whether or not. When the detection signal converted by the first analog-to-digital converter is greater than the second reference level larger than the first reference level and is maintained for a predetermined time, the micro-controller unit may be abnormal. It is characterized by judging.

In addition, the hot wire sensor device further includes a reed switch that transmits a signal that causes a disconnection when the magnetic object approaches, causing the microcontroller to perform a work test function.

According to another aspect of the present invention, a method of detecting a hot wire sensor device includes

In the detection method of the hot-wire sensor device for converting the infrared rays emitted from the surveillance area into an electrical signal, amplifying and filtering them, and detecting the intrusion of the intruder through the filtered detection signal,

(a) converting the filtered signal into a digital signal;

(b) measuring the ambient temperature of the sensing area and obtaining information thereon;

(c) converting the information obtained in step (b) into a digital signal;

(d) setting a first reference level by using the information on the ambient temperature converted in step (c), comparing the first reference level with the detected signal converted in step (a), and invading the intruder. Determining the step.

At this time, the determination of intrusion in the step (d) is larger than the first reference level, the detection signal converted in the step (a) is larger, the time interval between the number of detection of the larger detection signal and the larger detection signal It is characterized by determining whether the intruder through the intrusion.

In addition, the sensing method of the hot wire sensor device is that if the detection signal converted in the step (a) is larger than the second reference level larger than the first reference level and lasts for a predetermined time, the hot wire sensor device is abnormal. And determining that there is.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention. Like parts are designated by like reference numerals throughout the specification.

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

3 is a view showing a heat ray sensor device according to an embodiment of the present invention.

As shown in FIG. 3, the heat ray sensor device according to the embodiment of the present invention includes a lens 101, an infrared sensor unit 102, an amplifying unit 103, a filter unit 104, and an analog-to-digital converter. (Hereinafter referred to as 'ADC')-1 (105), ADC-2 (106), micro-controller (107), temperature measuring unit (thermistor) 108, Reed Switch or A Hall IC 109, a light emitting diode (LED) 110, an alarm output unit 111, a communication module 112, and a wireless communication module 113 are included.

The lens 101 collects the infrared rays of the human body coming out in various directions and sends them to the infrared sensor unit 102 to capture a signal having a small amount of infrared rays. That is, the lens 101 is a device for collecting infrared energy emitted from the human body.

The infrared sensor unit 102 converts the change in the infrared light collected through the lens 101 into an electrical signal. As described above with reference to FIG. 2, the infrared sensor unit 102 outputs a change in infrared rays as an electric signal (change in voltage) in the monitoring area. The infrared sensor unit 102 includes a thermistor, a bolometer, a thermopile, a pyroelectric element, and the like. Typical examples are pyroelectric elements. The pyroelectric element is a differential element that generates a signal only when there is a temperature change, and there is no output for a person who does not move. A detailed description of the pyroelectric element is described in detail in Korean Laid-Open Patent Publication No. 2000-0024550 and will be omitted below.

The amplifier 103 amplifies the magnitude of the electrical signal converted by the infrared sensor unit 102. That is, since the amplification unit 103 is not suitable for signal processing because the electrical signal converted by the infrared sensor unit 102 is a weak signal, the amplification unit 103 performs voltage amplification so that it can be used. A concrete implementation of this is to obtain a sufficient voltage amplification gain by using the OP-AMP in multiple stages. It is preferable that the amplifier 103 amplifies a signal using a two stage amplifier using a gain of about 60 to 70 dB.

The filter unit 104 filters to remove low and high frequency components from the signal amplified by the amplifier 103. At this time, in consideration of the speed, the frequency response characteristics of the infrared sensor unit 102, etc., when a person moves the recognition region, a low pass component and a high frequency component are filtered using a band pass filter.

The analog-to-digital converter (ADC) -1 105 converts the analog signal filtered by the filter unit 104 into a digital signal.

The microcontroller 107 controls the hot wire sensor device according to the exemplary embodiment of the present invention, such as determining whether an intruder is detected in the surveillance region by using the digital signal converted by the ADC-1 105. In addition, various additional functions such as a walk test function, a temperature compensation function, a self-diagnosis function, and an alarm memory function are provided.

The Reed Switch or Hall IC 109 provides a walk test function, that is, a function used to confirm the normal operation of the hot wire sensor device when installing or performing maintenance on the hot wire sensor device. However, when the inspection rod is close, it becomes a disconnection and information about this is transmitted to the microcontroller 107, and the microcontroller 107 detects a sensor detection state when such a signal is transmitted from the reed switch or the hole IC 109. Output through the LED (110). The reed switch is configured in the form of a vacuum tube tube, and if a magnetic field is formed nearby, the polarization is affected by the magnetic field, so when a check rod is contacted, a disconnection is formed, and information about this is transmitted to the microcontroller 107. Hall ICs perform the same functions as Reed Switches, but have a smaller IC shape, which allows them to work simultaneously with other components when soldering onto a PCB, which is more advantageous than Reed Switches in the process. On the other hand, the check rod has a magnet attached to the end of the bar, like a baton. Since most of the hot wire sensor device is mainly installed in a high position, a rod-type bar that can be resized such as a baton to contact a magnet to a reed switch or hall IC 109 is preferable.

The ambient temperature measuring unit (thermistor) 108 measures the ambient temperature in the sensing area and transmits the information about the ambient temperature. As a representative example, a thermistor may be used, but it is apparent to those skilled in the art that other elements may be used. The analog signal measured by the ambient temperature measuring unit (thermistor) 108 is converted into a digital signal by the analog-to-digital converter (ADC) -2 106 and transmitted to the microcontroller unit 107. Here, thermistor 108 is a semiconductor device whose characteristics of electrical resistance vary greatly with temperature, and have a negative resistance in which the resistance value decreases when the temperature rises. The temperature signal measured by the ambient temperature measuring unit (thermistor 108) is converted into a digital signal by the ADC-2 106, and the microcontroller unit 107 uses the information on the ambient temperature converted into a digital signal. Temperature compensation. That is, the microcontroller 107 compensates the temperature by changing the size of the reference level used by the intruder to determine the detection in consideration of the information on the ambient temperature. At this time, the size of the reference level may be set to an appropriate value through experiments with ambient temperature. Through this, the thermistor is used in the amplification stage in the conventional temperature compensation method. When the temperature rises due to the characteristics of the thermistor, the resistance value changes only in one direction (when going up or down). It can solve the problem caused by not made. That is, the microcontroller 107 changes the reference level according to the ambient temperature in consideration of the information on the ambient temperature transmitted through the temperature measuring unit (thermistor 108) and the ADC-2 106, such as in summer. Ambient background temperature can reduce the possibility of non-sensing that can occur because the temperature difference between intruders is small.

4 is a flow diagram illustrating a method for finally outputting an alarm by finally determining in consideration of the temperature compensation whether the microcontroller 107 invades the surveillance region in the heat ray sensor device according to the embodiment of the present invention. It is a chart.

First, the microcontroller 107 reads a signal generated when sensing the ambient temperature and the human body transmitted through the ADC-1 105 and the ADC-2 106 described above (S101). At this time, the microcontroller 107 changes the reference level based on the information on the ambient temperature received through the thermistor 108 and the ADC-2 106 (S102). Here, the reference level is appropriately set in advance by an appropriate reference level.

When the human body detection signal is higher than the reference level, the microcontroller 107 stores the detection time and increases the detection frequency (S103, S104). In this case, when the human body detection signal is lower than the reference level, the intruder does not intrude, so the process goes back to the first step S101.

Next, the microcontroller 107 determines the number of times of detection (S105). When the number of times of detection is one time, the microcontroller 107 returns to step 101 again (S105 and S101).

If the number of detection times is two, it is determined whether the difference between the first and second detection time is 10 seconds or less (S106). At this time, if less than 10 seconds to maintain the number of times of detection, that is the second time and return to step S101 (S106, S107, S101), otherwise it is determined that the human body is not detected and initializes the number of detection and then to step S101 It returns (S107, S101).

If the number of times of detection is three times, the microcontroller 107 determines whether the difference between the second and third times of detection is within 5 seconds (S109). If it is not within 5 seconds, it is determined that the human body has not invaded the monitoring area, and the detection frequency is initialized and the process returns to step S101 again (S109, S110, S101). If less than 5 seconds, the microcontroller 107 outputs an alarm through the alarm output unit 110 (S109, S111).

As described above, the microcontroller 107 determines whether the intruder is invading the surveillance area and outputs an alarm. The time interval between the first detection and the second detection and the condition that the detected signal is greater than the reference signal level 10 Second), and the time interval (5 seconds) between the second and third detections. At this time, the time interval is shown as 10 seconds and 5 seconds, for example, but it is obvious that it can be changed because a suitable time interval can be set through sufficient experiments. Through this, it is possible to minimize the malfunction caused by the external environment (that is, the change in the ambient temperature), the malfunction caused by small animals.

The alarm output unit 110 notifies the outside when the invader's surveillance area is detected by the microcontroller unit 107, and the LED 110 has a function of displaying the state of the hot wire sensor device to the outside. do. At this time, it is apparent to those skilled in the art that the LED 110 may be implemented by another device having a function of displaying the state of the hot wire sensor device to the outside, that is, an external display function.

5 is a diagram conceptually illustrating that the microcontroller 107 of the heat ray sensor device according to an exemplary embodiment of the present invention performs a self-diagnostic function, and outputs the amplifier 103 generated when the self-diagnostic function is performed. The signal is shown.

As shown in FIG. 5, the microcontroller 107 outputs a value higher than the upper limit reference level or a value lower than the lower limit reference level from the amplifier 103 (for example, 1 minute or longer). If it persists, the heating sensor device outputs a fault. In this case, the upper and lower reference levels are set to a value that is much higher or lower than a signal generated when the intruder enters the surveillance area, and a predetermined period of time is set to an appropriate value through an experiment. In other words, in order to make a difference between the signal generated when an intruder invades and the signal generated when there is an abnormality in the hot wire sensor device, the error range is considered and the preset value does not come from the signal generated when the intruder intrudes. will be. For example, it can be set slightly lower than the voltage biased by the amplifier.

In addition, the microcontroller 107 according to an embodiment of the present invention has an alarm memory function. FIG. 6 is a diagram conceptually illustrating an alarm memory function performed by the microcontroller 107. The alarm memory function informs which hot wire sensor devices are detected in a state where several hot wire sensor devices are connected in the same loop.

FIG. 6 (a) is a PIR (Passive Infrared) output signal, that is, an output signal which is output when the hot wire sensor device detects an intruder, and the microcontroller 107 enters and exits the surveillance area of the intruder to perform an alarm memory function. The history detected by an error or malfunction is stored in the memory. At this time, the microcontroller 107 also stores the detected time in a memory. Subsequently, when the inspector operates the alarm memory function of the microcontroller 107 as shown in FIG. 6B by using a check rod or other means, the microcontroller 107 has a predetermined period from the time when the alarm memory operates. 6 (c) of FIG. 6 by transferring the history detected in the memory (from 5 to 60 minutes) from the memory and transmitting information to the external display 200 through the LED (110) or IrDA (Infrared Data Association) communication. In this case, the microcontroller 107 outputs only the detected history instead of outputting all of the detected histories even when the inspector approaches the hot wire sensor device to check. This is because it is detected by the hot wire sensor device (indicated by a footer by the inspector in Fig. 6.) In Fig. 6, the detection history from five minutes ago is outputted. If there are several hot wire sensor devices in the space (indoor space), it is determined that the entire inspection can be performed in about 5 minutes, so the value can be set differently according to the situation. It is possible to distinguish which hot wire sensor device has detected one of the most problematic problems after installation.

On the other hand, the communication module 112 may be connected to the external device 300, and when connected to the external device 300, may transmit the detection state and internal information detected inside the hot wire sensor device and the external device 300 Can be directly controlled. In this case, the communication module 112 transmits various information transmitted from the microcontroller 107 to the external device 300, and transmits control information transmitted from the external device 300 to the microcontroller 107. The microcontroller 107 may be controlled by the external device 300. The external device 300 refers to a monitoring system installed in a monitoring center that monitors a hot wire sensor device as a whole. The communication module unit 112 may transmit or control the detection state and internal information of the hot wire sensor device, thereby enabling the detection and control of the detection state of the hot wire sensor device from a long distance. Through the implementation of the communication module 112 can be appreciated by those skilled in the art, a detailed description thereof will be omitted below.

The wireless communication module unit 113 provides a function of wirelessly communicating with the external display 200. When the information on the result of the above-described alarm memory function and the self-diagnosis function is received from the external display 200, it is transmitted to the microcontroller 107, and the microcontroller 107 measures the alarm measured by the method described above. The memory state or the self-diagnosis state is transmitted to the external display unit 200 through the wireless communication module 113. In this case, the wireless communication module 113 may perform IrDA communication through a standard determined by an Infrared Data Association (IrDA). In this case, the external display 200 may use personal digital assistants (PDAs), and the inspector may view an alarm memory and a self-diagnosis result through an external display 200 such as a PDA.

Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

As described above, it is possible to intelligently detect whether or not the external intrusion through the micro-controller unit can prevent malfunction due to the external environment, malfunction by small animals.

In addition, through the microcontroller unit, a temperature compensation function that can detect even when the temperature difference between the human body and the human body is small, and an alarm memory that allows the user to know which operation was performed when several hot wire sensor devices were simultaneously connected in the same loop. The function, the self-diagnosis function that diagnoses the internal abnormality itself, and the inspection rod provide easier work test function, providing an effective and useful heat ray sensor device.

In addition, various types of information may be transmitted to the external display through the wireless communication module unit, and various types of information may be transmitted and controlled through the communication module unit, thereby providing convenience of use and monitoring.

1 is a view showing the configuration of a conventional heat ray sensor device.

2 is a view showing an output signal according to the temperature of the infrared sensor in the conventional heat ray sensor device.

3 is a view showing a heat ray sensor device according to an embodiment of the present invention.

FIG. 4 is a flowchart illustrating a method of finally making an alarm output by determining whether a microcontroller intrudes an intruder in a surveillance region in the heat ray sensor device according to an embodiment of the present invention in consideration of temperature compensation.

5 is a view conceptually showing that the microcontroller of the heat ray sensor device according to an embodiment of the present invention performs a self-diagnostic function.

6 is a diagram conceptually illustrating that the microcontroller unit of the heat ray sensor device according to an embodiment of the present invention performs an alarm memory function.

Claims (14)

In the hot-wire sensor device for converting the infrared rays from the surveillance area into an electrical signal, amplified and filtered, and detecting the intrusion of the intruder through the filtered detection signal, A first analog to digital converter converting the filtered sensed signal into a digital signal; An ambient temperature measuring unit measuring ambient temperature of the sensing area and transmitting information about the ambient temperature; A second analog to digital converter converting the information transmitted by the ambient temperature measuring unit into a digital signal; An intruder by setting a first reference level by using information on the ambient temperature converted by the second analog-digital converter, and comparing the first reference level with the sensed signal converted by the first analog-digital converter. Heat sensor device including a micro-controller to determine whether the intrusion. The method of claim 1, The microcontroller has a larger detection signal converted by the first analog-digital converter than the first reference level, and determines whether an intruder intrudes through a time interval between detection times of a larger detection signal and a larger detection signal. Hot wire sensor device characterized in that judging. The method of claim 1, The microcontroller may determine that the hot wire sensor device is abnormal when the sensing signal converted by the first analog-to-digital converter is greater than the second reference level larger than the first reference level and lasts for a predetermined time. Hot wire sensor device, characterized in that. The method of claim 1, The microcontroller unit stores the information about the intruder when it determines that the intruder is intruded, and transmits the information on the request of the inspector.  The method according to claim 1 or 2, And a reed switch which transmits a signal for disconnecting the magnetic object and causing the microcontroller to perform a walk test function. The method according to claim 1 or 2, And a Hall IC for transmitting a signal for disconnecting the magnetic object and causing the microcontroller to perform a walk test function. The method according to claim 3 or 4, And a wireless communication module unit configured to wirelessly transmit information determined by the micro controller unit to an external display. The method according to claim 1 or 2, And a communication module for transmitting information determined by the microcontroller to an external device and receiving various control signals from the external device. The method according to claim 1 or 2, And an alarm output unit for displaying the intruder when the intruder determines that the intruder has intruded. In the detection method of the hot-wire sensor device for converting the infrared rays emitted from the surveillance area into an electrical signal, amplifying and filtering them, and detecting the intrusion of the intruder through the filtered detection signal, (a) converting the filtered signal into a digital signal; (b) measuring the ambient temperature of the sensing area and obtaining information thereon; (c) converting the information obtained in step (b) into a digital signal; (d) setting a first reference level by using the information on the ambient temperature converted in step (c), comparing the first reference level with the detected signal converted in step (a), and invading the intruder. Detecting a hot wire sensor device comprising the step of determining. The method of claim 10, Determination of intrusion in the step (d) is larger than the first reference level the detection signal converted in the step (a) is larger, and through the time interval between the number of detection of the larger detection signal and the larger detection signal Detecting whether or not the intruder invading hot wire sensor device detection method characterized in that. The method of claim 10, The heating element further comprises the step of determining that the hot wire sensor device is abnormal when the detection signal converted in the step (a) is larger than the second reference level larger than the first reference level and lasts for a predetermined time. How to detect sensor device. The method according to claim 10 or 11, wherein If it is determined that the intruder intruded in step (d), storing the information about the transmission of information on the request of the inspector further comprising the step of detecting. The method according to claim 10 or 11, And displaying the information determined in step (d) to notify the outside.