JP2007271552A - Abnormal temperature sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To detect an abnormal temperature change occurring in a detection area and give an alarm depending on the degree of danger, in order to give a notice of the danger such as a fire or the like. <P>SOLUTION: An abnormal temperature sensing method is provided for measuring temperatures of respective segments of the sensing area by using an infrared sensing element which receives infrared light from the sensing area and outputs a sensing signal whose output level corresponds to the amount of received light, for sensing an abnormal temperature of the sensing area based on temperature information of respective segments, and for giving an abnormal temperature sensing alarm. The abnormal temperature sensing method executes a step of acquiring temperature information including the latest set of temperatures and a set of temporal temperature differences (each representing a difference between the latest temperature and the previous temperature) for respective segments of the sensing area, and a step of detecting the abnormal temperature based on the temperature information of respective segments and determining a speed at which the abnormal temperature area expands, thereby carrying out abnormal temperature detections classified in accordance with the speed at which the abnormal temperature area expands, and giving different kinds of alarm in accordance with the expansion speed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an abnormal temperature detection device that detects an abnormal temperature change by detecting infrared rays radiated from an object with an infrared detection element, and detects the occurrence of a fire or the like.

There is an infrared light receiving type human body detection device that detects the presence of a human body by detecting a temperature difference between a human body and a background as an infrared energy amount difference using an infrared detection element such as a pyroelectric element. This human body detection device is configured to determine that a human body is present when an apparent temperature change occurs in a detection region from the infrared detection element.
According to the prior art, there is known an abnormality detection device that uses a human body detection device provided with an infrared detection element to detect a human body and at the same time detect an abnormal temperature such as the occurrence of a fire. (For example, see Patent Document 1)
A conventional abnormal temperature detection device receives an infrared ray from a detection region and outputs a detection signal having an output level corresponding to the amount of light received, and a detection region based on a detection signal output from the infrared detection device A human body detection unit that determines the presence or absence of a human body, and an abnormal temperature detection unit that detects an abnormal temperature change due to a fire in the detection region based on a detection signal output from the infrared detection element, An intrusion alarm is issued when the human body detection unit detects the presence of a human body, and an alarm (for example, a fire alarm) different from the intrusion alarm is issued when an abnormal temperature is detected by the abnormal temperature detection unit. It is configured.
Japanese Patent Laid-Open No. 5-346994

In the conventional abnormal temperature detection device, when the amount of infrared light received from the detection region exceeds a preset value (set level), it is determined that a human body is detected or an abnormal temperature is detected. The setting level for detecting the human body temperature (human body detection temperature) and the setting level for detecting the abnormal temperature (fire occurrence temperature) are set.
Also, in abnormal temperature detection that detects abnormal temperature changes due to the occurrence of fire, etc., it is determined that a fire has occurred if the set level is exceeded multiple times and a flame pulse that causes flickering or fluctuation is detected multiple times. By configuring the system to issue a fire alarm, the misinformation of the fire alarm was suppressed. In order to suppress false alarms for fire alarms, the occurrence of flames is assumed to be fire alarms, and it was not possible to issue alarms for abnormal temperatures that could cause fires before the flames occurred.

  According to the abnormal temperature detection device of the present invention, an infrared detection element that receives infrared light from a detection region and outputs a detection signal having an output level corresponding to the amount of received light, and a detection signal output from the infrared detection element. A temperature detection unit that acquires a measured temperature for each section of the detection region based on the control unit that detects an abnormal temperature in the detection region based on an output signal from the temperature detection unit, and an abnormal temperature detection by the control of the control unit In the abnormal temperature detection device configured with an output unit that issues an alarm, the control unit includes a current temperature and a time-dependent temperature difference for each section of the detection region based on an output signal sequentially input from the temperature detection unit. The temperature information is acquired, the abnormal temperature is detected based on the temperature information for each section, and the speed at which the abnormal temperature range expands is determined. The controls the output unit to alarm.

  Furthermore, according to the abnormal temperature detection method of the present invention, the temperature of the detection region is measured for each section by the infrared detection element that receives infrared light from the detection region and outputs a detection signal of an output level according to the amount of received light. In the abnormal temperature detection method that detects abnormal temperature in the detection area based on the temperature information for each section and issues an abnormal temperature detection alarm, temperature information consisting of the current temperature and the temperature difference over time is detected for each section of the detection area. The abnormal temperature classified according to the speed at which the abnormal temperature range is expanded by the step of acquiring and the step of detecting the abnormal temperature based on the temperature information for each section and determining the speed at which the abnormal temperature range is expanded Detects and issues different types of alarms according to the speed of spread.

According to the abnormal temperature detection device and the abnormal temperature detection method of the present invention, an infrared detection element (thermopile element) is used to acquire a measured temperature for each section of the detection region, and further, temperature information for each section (current temperature and Detects abnormal temperature generated in the detection area based on the temperature difference over time), determines the speed at which the abnormal temperature range expands, and issues different types of alarms according to the speed at which the abnormal temperature range expands. Even if the measured temperature (abnormal temperature) is not very high, it is possible to detect an abnormal temperature that may cause a fire by detecting an abnormal temperature change where the speed of expansion of the abnormal temperature range is rapid. , Regardless of the presence or absence of flames, can inform the danger of fire. That is, TPH-A reporting when the abnormal temperature range spreads suddenly, TPH-B reporting when not very sharp, and TPH-C reporting when the spreading is slow but very hot, Can inform the danger of fire.
Also, in contrast to the prior art abnormal temperature detection device that detects the occurrence of a fire only by detecting abnormal temperature (fire detection temperature) and issues an alarm, the abnormal temperature detection device of the present invention has an abnormal temperature detection and abnormal temperature range. By detecting the spreading speed, abnormal temperature detection is performed according to the speed at which the abnormal temperature range spreads, and different types of alarms are issued. Can be issued, and misreporting of fire alarms can be suppressed.

  A preferred embodiment of the abnormal temperature detection device according to the present invention will be described with reference to FIGS.

FIG. 1 is a diagram illustrating an abnormal temperature detection device according to the present invention.
The abnormal temperature detection device according to the present invention uses an infrared detection element (thermopile element) that can measure the surface temperature of an object based on the amount of received infrared light, and detects and alarms an abnormal temperature change that may cause a fire. As shown in FIG. 1A, the abnormal temperature detection device 10 is installed in an area to be monitored (for example, a ceiling of a monitoring area), and a temperature change of an object in the area (hereinafter referred to as a detection area) is detected. Detects and detects an abnormal temperature in the detection area, issues an abnormal temperature detection alarm, and monitors and guards the detection area.

  As shown in the block diagram of FIG. 1B, the abnormal temperature detection device 10 according to the embodiment of the present invention includes a condenser lens 1, an optical filter 2 that transmits only infrared rays in a specific wavelength band, and infrared light reception. From the infrared detection element 3 that outputs the detection signal, the amplification unit 4 that amplifies the detection signal output from the infrared detection element 3, the temperature detection unit 5 that is connected to the amplification unit 4, and the temperature detection unit 5 The control unit 6 to which the output signal is input and the output unit 7 that issues different types of alarms under the control of the control unit 6 are provided.

The infrared detection element 3 is configured to receive infrared light for each section from a detection region divided into a plurality of sections and output a detection signal of an output level corresponding to each received light amount for each section. .
As the infrared detection element 3 that outputs a detection signal for each section of the detection area, for example, a plurality of detection elements are arranged, and the detection range for each detection element is set to divide the detection area into a plurality of sections. Each detection element corresponding to each section is configured to output a detection signal for each section, or the detection element is controlled using a motor or the like to change the detection range by the detection element as needed. By using this means, it is possible to output detection signals for a plurality of sections in the detection region from one detection element for each section, and use a configuration configured to output the detection signals for each section.
The temperature detection unit 5 measures the surface temperature of the object in the detection region based on the detection signal from the infrared detection element 3, and acquires the measurement temperature for each detection element. That is, the measured temperature for each section of the detection area can be acquired.
Further, the control unit 6 determines whether or not an abnormal temperature change having a risk of fire or the like has occurred in the detection region based on an output signal from the temperature detection unit 5 (abnormal temperature detection), When the temperature is detected, control is performed so that an abnormal temperature detection alarm is issued from the output unit 7.
The control unit 6 may be configured to determine whether or not a human body exists in the detection region based on an output signal from the temperature detection unit 5 and to issue a human body detection alarm from the output unit 7. Good.

  In the abnormal temperature detection device 10 according to the present invention, an output signal (measured temperature for each detection element) from the temperature detection unit 5 is sequentially input to the control unit 6, and the control unit 6 is based on the output signal sequentially input. Temperature information including the current temperature and the time-dependent temperature difference (temperature difference between the previous temperature and the current temperature) is acquired for each section of the detection area. In addition, the control unit 6 detects abnormal temperatures based on temperature information for each detection element and determines the speed at which the abnormal temperature range expands, thereby classifying the abnormal temperatures according to the speed at which the abnormal temperature range expands. Detects and issues different types of alarms.

  The abnormal temperature detection method according to the first embodiment of the present invention will be described with reference to FIGS.

In the first embodiment, as shown in FIG. 5, an abnormality using an infrared detection element (i = 1 to I, I = 8) having a one-dimensional configuration in which eight infrared detection elements (thermopile elements) are arranged in a row. The temperature detection device 10 detects an abnormal temperature in the detection region. The eight infrared detection elements [8 × 1] output detection signals for each section so that the detection area is divided into eight sections [8 × 1], and temperature information is obtained for each section of the detection area. To do. That is, the coordinate value of each detection element corresponds to the coordinate value of each section of the detection region. Therefore, by analyzing the temperature information acquired based on the detection signal output from each detection element for each detection element, the temperature information is acquired for each section of the detection region, and abnormalities are detected based on the temperature information. It is possible to detect the temperature and determine the speed at which the abnormal temperature range is widened.
In this embodiment, the temperature of the detection region is measured for each section by an infrared detection element (i = 1 to 8) that receives infrared light from the detection region and outputs a detection signal having an output level corresponding to the amount of light received. In the abnormal temperature detection method that detects the abnormal temperature in the detection area based on the temperature information for each detection element and issues an abnormal temperature detection alarm, the current temperature and the time-dependent temperature difference (temperature difference between the previous temperature and the current temperature) The speed at which the abnormal temperature range spreads is obtained by the step of acquiring temperature information for each sensing element and the step of detecting the abnormal temperature based on the temperature information for each sensing element and determining the speed at which the abnormal temperature range is widened. Abnormal temperature detection classified according to the type is performed, and different types of alarms are issued according to the spreading speed.

A process of acquiring temperature information including a current temperature and a time-dependent temperature difference for each detection element based on an output signal sequentially input from the temperature detection unit 5 will be described with reference to a flowchart of FIG.
In acquiring temperature information for each detection element based on detection signals from a plurality of infrared detection elements (thermopile elements), it is first determined whether or not it is the first abnormal temperature detection routine (step S1). (YES), after acquiring the measured temperature of each detection element (i = 1 to I) based on the output signal input from the temperature detection unit 5 and setting it as the previous temperature (t0 [i]) ( In step S2), the TPH count obtained by counting the number of detected abnormal temperatures is reset (step S3). Thereafter, the current temperature (t1 [i]) of each sensing element (i = 1 to I) is measured based on the next output signal input from the temperature sensing unit 5 (step S4), and each sensing element A temperature difference (tdiff [i]) between the previous temperature (t0 [i]) and the current temperature (t1 [i]) is obtained (step S5).
If it is not the first routine (NO), since the previous temperature (t0 [i]) has already been acquired, the process proceeds to step S3 without passing through step 2, and then the current temperature (t1 [i]) of each detection element is set. While measuring (step S4), the temperature difference (tdiff [i]) between the previous temperature (t0 [i]) and the current temperature (t1 [i]) of each sensing element is obtained (step S5).

  The measurement of the previous temperature (t0 [i]) in step S2, the measurement of the current temperature (t1 [i]) in step S4, and the calculation of the temperature difference (tdiff [i]) in step S5 are performed for each sensing element. The temperature information consisting of the current temperature (t1 [i]) and the temperature difference with time (tdiff [i]) is acquired for each sensing element (i = 1 to I).

Next, the process of detecting the abnormal temperature based on the temperature information for each detection element and determining the speed at which the abnormal temperature range is expanded will be described with reference to the flowchart of FIG.
According to the abnormal temperature detection method shown in FIG. 3, first, one of a plurality of detection elements is set as a scan reference (step S6), and the temperature information of the scan reference and its one and two adjacent detection elements is set. The abnormal temperature is detected by scanning. Then, by scanning all the detection elements while moving the scan reference one by one, the abnormal temperature of the entire detection region is detected (steps S7 to S15).

The scan reference setting range is a detection element (3 ≦ i ≦ I−2) excluding two elements (1, 2, I−1, I) at both ends of all the detection elements (i = 1 to I). .
FIG. 5A illustrates a scan reference setting range according to this embodiment. In this embodiment, since a detection element (i = 1 to 8) having a one-dimensional configuration (8 × 1) in which eight detection elements are arranged in a row is used, a detection element (dot region) of 3 ≦ i ≦ 6 is used. Is set as the scan reference range, the scan reference is set as the start point (i = 3), and the scan reference is moved one by one until reaching the end point (i = 6). Repeat detection.

In this embodiment, as shown in the flowchart of FIG. 3, first, a scan reference is set as a start point (step S6), and the current temperature in the scan reference and its one and two adjacent detection elements is scanned. TPH detection is performed to determine whether or not there is a detection element having a temperature level (for example, 45 ° C.) or higher (step S7), and it is detected whether or not an abnormal temperature change with a risk of fire has occurred.
When TPH is detected (YES), the time-dependent temperature difference in the next detection element of the scan reference is scanned to determine whether the next temperature difference is equal to or higher than a first temperature difference level (for example, 5 ° C.). A first temperature difference determination (step S8) is performed.
If the adjacent temperature difference is equal to or higher than the first temperature difference level (YES), the temperature difference between the two adjacent detection elements of the scan reference is scanned, and the adjacent temperature difference is the second temperature difference. A second temperature difference determination is performed to determine whether or not the level (for example, 5 ° C.) or higher (step S9).
On the other hand, if the adjacent temperature difference is less than the first temperature difference level (NO), the scan reference and the current temperature in the one and two adjacent detection elements are scanned to obtain a second temperature level (for example, 80 ° C.). ) TPH-C detection is performed to determine whether or not there is the above detection element (step S10).

In the first temperature difference determination, the temperature difference of one adjacent detection element of the scan reference is equal to or higher than a first temperature difference level (for example, 5 ° C.) (YES), and in the second temperature difference determination, the scan reference If the temperature difference between two adjacent sensing elements is equal to or higher than the second temperature difference level (for example, 5 ° C.) (YES), it is determined that TPH-A is abnormal and 1 is added to the TPH-A count (step S11). ).
Further, in the first temperature difference determination, the temperature difference of one adjacent sensing element of the scan reference is equal to or higher than a first temperature difference level (for example, 5 ° C.) (YES), but in the second temperature difference determination, the scan reference When the temperature difference between two adjacent sensing elements is less than the second temperature difference level (for example, 5 ° C.) (NO), it is determined that TPH-B is abnormal, and 1 is added to the TPH-B count (step S12). ).
On the other hand, in the first temperature difference determination, the temperature difference of one adjacent detection element of the scan reference is less than the first temperature difference level (for example, 5 ° C.) (NO), but in the TPH-C detection, the scan reference and its 1 If one of the two or two adjacent sensing elements detects a temperature equal to or higher than the second temperature level (for example, 80 ° C.) (YES), it is determined that the TPH-C is abnormal and the TPH-C count is set to 1. Add (step S13).

That is, in the abnormal temperature detection method according to the present invention, after the TPH detection, the first temperature difference determination, the second temperature difference determination, and the TPH-C detection are performed to detect the TPH-A abnormality when the abnormal temperature spreads rapidly ( Detection of either step S11), TPH-B abnormality detection when the spread is not so rapid (step S12), or TPH-C abnormality detection when the spread is slow but very high (step S13) Then, abnormal temperature detection classified according to the speed at which the abnormal temperature range expands is performed.
Then, based on the scan reference (i = 3) set in step S6, after performing abnormal temperature detection classified according to the speed at which the abnormal temperature range spreads, the scan reference is set to the next detection element (i = 4) (step S14), this time, based on the scan reference (i = 4), abnormal temperature detection classified according to the speed at which the abnormal temperature range spreads is performed (steps S7 to S13).
After the scan reference is moved to the next detection element (step S14), it is determined whether or not the scan reference setting range is exceeded (i> (I-2)) (step S15), and the scan reference is within the setting range. If it is within the range (NO), the process returns to step 7, and the abnormal temperature detection in steps S7 to S13 is executed based on the moved scan reference.
On the other hand, when the moved scan reference exceeds the set range (YES), the process proceeds to the next process (step 16) (see the flowchart of FIG. 4).

In FIG. 5B, when the scan reference is the start point (i = 3), the detection element (shaded area) that is the target of scanning of the current temperature in TPH detection and TPH-C detection, and the first temperature difference A detection element (shaded area) that is a scan target of the temperature difference in the determination and a detection element (shaded area) that is the scan target of the temperature difference in the second temperature difference determination are respectively illustrated.
FIG. 5C shows a detection element (shaded area) that is a scan target of the current temperature in TPH detection and TPH-C detection when the scan reference is moved by one from the start point (i = 4). A detection element (shaded area) that is a scan target of the temporal temperature difference in the first temperature difference determination and a detection element (shaded area) that is the scan target of the temporal temperature difference in the second temperature difference determination are respectively illustrated.
Further, FIG. 5D shows a detection element (shaded area) to be scanned at the current temperature in the TPH detection and TPH-C detection when the scan reference is the end point (i = 6), and the first temperature difference. A detection element (shaded area) that is a scan target of a temporal temperature difference in the determination and a detection element (shaded area) that is a scan target of the temporal temperature difference in the second temperature difference determination are respectively illustrated.

If the moved scan reference exceeds the set range when the scan reference is moved next, whether or not the TPH-A count is 1 or more (tph-a ≧ 1) as shown in the flowchart of FIG. Is determined (step S16), and when the TPH-A abnormality is detected, control is performed so that TPH-A is issued from the output unit (step S17).
If there is no TPH-A abnormality detection, it is determined whether there is a TPH-B abnormality by determining whether the TPH-B count is 1 or more (tph-b ≧ 1) (step S18). When the TPH-B abnormality is detected, control is performed so that TPH-B is issued from the output unit (step S19).
If neither TPH-A abnormality detection nor TPH-B abnormality detection is present, it is determined whether there is a TPH-C abnormality by determining whether the TPH-C count is 1 or more (tph-c ≧ 1). If the TPH-C abnormality is detected (step S20), control is performed so that TPH-C is issued from the output unit (step S21).

  When TPH-A abnormality detection, TPH-B abnormality detection, or TPH-C abnormality detection is performed, different types of abnormal temperature detection alarms are issued (TPH-A notification, TPH-B notification, TPH). -C alerting), informing the guards, etc. waiting in the security room that an abnormal temperature change has occurred in the detection area. The abnormal temperature detection alarm is output not only to a security room or the like where a guard or the like waits but also to a detection area.

Then, an alarm temperature detection alarm is confirmed by a security guard, etc., and a process for solving the abnormal temperature detection (for example, monitoring image confirmation of the detection area or on-site confirmation) is performed (step S22). After the alarm is reset by (step S23), the previous temperature for each sensing element is updated by rewriting the current temperature (t1 [i]) for each sensing element as the previous temperature (t0 [i]) in the control unit. (Step S24), and the abnormal temperature detection is terminated.
If there is no TPH-A abnormality detection, TPH-B abnormality detection, or TPH-C abnormality detection, the abnormal temperature detection alarm is not issued, the previous temperature for each detection element is updated (step S24), and the abnormal temperature detection is performed. finish.

Then, the control unit obtains temperature information for each detection element at regular intervals (FIG. 2), and classifies the abnormal temperature according to the speed at which the abnormal temperature range spreads based on the temperature information for each detection element. Detection (TPH-A abnormality detection, TPH-B abnormality detection, TPH-C abnormality detection) (Figure 3), and different types of abnormal temperature detection alarms are issued (TPH-A issuance, TPH-B issuance) , TPH-C) (FIG. 4), an abnormal temperature in the detection area is detected and an alarm is issued.
Note that the first temperature level (tph) in the TPH detection, the second temperature level (tph-c) in the TPH-C detection, the first temperature difference level (tph-ab) in the first temperature difference determination, the second The detection sensitivity can be adjusted by adjusting the second temperature difference level (tph-bc) in the temperature difference determination. For example, by adjusting the first temperature difference level (tph-ab) in the first temperature difference determination and the second temperature difference level (tph-bc) in the second temperature difference determination, the speed of the abnormal temperature range can be increased. The abnormal temperature can be detected by adjusting the degree.

  As described above, according to the abnormal temperature detection method of the present invention, the abnormal temperature is detected based on the temperature information for each detection element (current temperature and time-dependent temperature difference), and the speed at which the abnormal temperature range is expanded is determined. Risk of fire occurrence regardless of the presence or absence of flames, in order to issue different types of alarms according to the speed of expansion of the range (TPH-A, TPH-B, and TPH-C) A warning corresponding to the degree can be issued, the danger of a fire can be informed, and an abnormal temperature with high performance can be detected and alarmed.

  Next, an abnormal temperature detection method according to the second embodiment of the present invention will be described with reference to FIGS.

In the second embodiment, as shown in FIG. 9, the infrared detection elements (i = 1 to I, j = 1) having a two-dimensional configuration (i, j) in which eight infrared detection elements (thermopile elements) are arranged in eight rows. ~ J) is used to detect an abnormal temperature in the detection region by the abnormal temperature detection device 10.
The 64 infrared detection elements [8 × 8] output detection signals for each section so that the detection area is divided into 64 sections [8 × 8], and temperature information is acquired for each section of the detection area. To do. That is, in this embodiment as well, as in the first embodiment, the coordinate value of each detection element corresponds to the coordinate value of each section of the detection region. Therefore, by analyzing the temperature information acquired based on the detection signal output from each detection element for each detection element, the temperature information is acquired for each section of the detection region, and abnormalities are detected based on the temperature information. It is possible to detect the temperature and determine the speed at which the abnormal temperature range is widened.
In this embodiment, the detection region is divided into sections by infrared detection elements (i = 1 to 8, j = 1 to 8) that receive infrared rays from the detection region and output detection signals having output levels corresponding to the received light amount. In the abnormal temperature detection method for detecting an abnormal temperature in the detection region based on the temperature information for each detection element and issuing an abnormal temperature detection alarm, the temperature and time-lapse are detected as in the first embodiment. A step of acquiring temperature information consisting of a temperature difference (temperature difference between the previous temperature and the current temperature) for each sensing element, and a speed at which an abnormal temperature is detected and the abnormal temperature range is expanded based on the temperature information for each sensing element. The abnormal temperature detection classified according to the speed at which the abnormal temperature range spreads is performed by the step of determining the thickness, and different types of alarms are issued according to the spread speed.

A process of acquiring temperature information including a current temperature and a time-dependent temperature difference for each detection element based on an output signal sequentially input from the temperature detection unit 5 will be described with reference to a flowchart of FIG.
When acquiring temperature information for each detection element based on detection signals from a plurality of infrared detection elements (thermopile elements), first, whether or not it is the first abnormal temperature detection routine, as in the first embodiment. If it is determined (step S31) and it is the first time (YES), each detection element ((i, j), i = 1 to I, j = 1 to J based on the output signal input from the temperature detection unit 5). ) To obtain the previous temperature (t0 [i, j]) (step S32), the TPH count obtained by counting the number of detected abnormal temperatures is reset (step S33). Thereafter, the current temperature (t1 [i, j]) of each detection element is measured based on the output signal next input from the temperature detection unit 5 (step S34), and the previous temperature (t0 [ i, j]) and the current temperature (t1 [i, j]) (tdiff [i, j]) is obtained (step S35).
If it is not the first routine (NO), since the previous temperature (t0 [i, j]) has already been acquired, the process proceeds to step S33 without passing through step 32, and then the current temperature (t1 [i, j,) of each detection element. j]) (step S34), and the temperature difference (tdiff [i, j]) between the previous temperature (t0 [i, j]) and the current temperature (t1 [i, j]) of each sensing element is obtained. (Step S35).

  Note that the previous temperature (t0 [i, j]) in step S32, the current temperature (t1 [i, j]) in step S34, and the temperature difference (tdiff [i, j]) in step S35 are measured. The calculation is repeatedly performed for each sensing element, and temperature information including the current temperature (t1 [i, j]) and the time-dependent temperature difference (tdiff [i, j]) is obtained for each sensing element ((i, j), i = 1 to I, j = 1 to J).

Next, the process of detecting the abnormal temperature based on the temperature information for each detection element and determining the speed at which the abnormal temperature range widens will be described with reference to the flowchart of FIG.
Even in the abnormal temperature detection according to the second embodiment, similarly to the first embodiment, one of the plurality of detection elements is set as a scan reference (step S36), and the scan reference and one and two adjacent ones thereof are set. Abnormal temperature detection is performed by scanning the temperature information of the detection element. Then, by scanning all the detection elements while moving the scan reference one by one, the abnormal temperature of the entire detection region is detected (steps S37 to S45).

The setting range of the scan reference is a detection element (3 ≦ i ≦ I−2, 3) excluding two surrounding elements among all the detection elements ((i, j), i = 1 to I, j = 1 to J). ≦ j ≦ J-2).
FIG. 9A illustrates a scan reference setting range according to this embodiment. In this embodiment, since a detection element (i, j) having a two-dimensional configuration (8 × 8) in which eight detection elements are arranged in eight rows is used, the detection elements satisfying 3 ≦ i ≦ 6 and 3 ≦ j ≦ 6 After setting the (dot area) as the scan reference setting range and setting the scan reference as the start point ((i, j) = (3, 3)), the end point ((i, j) = (6, 6) ), The scan reference is moved one by one, and the abnormal temperature detection is repeatedly executed for each scan reference.

In this embodiment, as shown in the flowchart of FIG. 7, first, the scan reference is set to the start point ((i, j) = (3, 3)) (step S36), and the scan reference and one and two of the scan references are set. Scan the current temperature in the adjacent sensing element and perform TPH detection to determine whether there is a sensing element of the first temperature level (for example, 45 ° C.) or higher (step S37), and an abnormal temperature change with a risk of fire Detection of whether or not has occurred.
When TPH is detected (YES), the time-dependent temperature difference in the next detection element of the scan reference is scanned to determine whether the next temperature difference is equal to or higher than a first temperature difference level (for example, 5 ° C.). A first temperature difference determination (step S38) is performed.
If the adjacent temperature difference is equal to or higher than the first temperature difference level (YES), the temperature difference between the two adjacent detection elements of the scan reference is scanned, and the adjacent temperature difference is the second temperature difference. A second temperature difference determination is performed to determine whether or not the level (for example, 5 ° C.) or higher (step S39).
On the other hand, if the adjacent temperature difference is less than the first temperature difference level (NO), the scan reference and the current temperature in the one and two adjacent detection elements are scanned to obtain a second temperature level (for example, 80 ° C.). ) TPH-C detection is performed to determine whether or not there is the above detection element (step S40).

As in the first embodiment, the TPH-A abnormality detection (step S41) when the abnormal temperature spread is abrupt, the TPH-B abnormality detection (step S42) when the spread is not so rapid, and the spread. The TPH-C abnormality detection (step S43) when the temperature is slow but very high is detected, and abnormal temperature detection is performed according to the speed at which the abnormal temperature range is expanded.
Thereafter, the scan reference ((i, j) = (3,3)) set in step S36 is moved to the next detection element ((i, j) = (4,3)) (step S44), this time. Based on the moved scan reference ((i, j) = (4,3)), abnormal temperature detection classified according to the speed at which the abnormal temperature range is expanded is performed (steps S37 to S43).
After the scan reference is moved to the next detection element (step S44), it is determined whether or not the scan reference setting range is exceeded (i> (I-2) and j> (J-2)) (step S44). S45) If the scan reference is within the set range (NO), the process returns to step 37, and abnormal temperature detection in steps S37 to S43 is executed based on the moved scan reference.
On the other hand, if the moved scan reference exceeds the set range (YES), the process proceeds to the next process (step 46) (see the flowchart of FIG. 8).

In FIG. 9B, when the scan reference is the start point ((i, j) = (3, 3)), the detection element (diagonal line) to be scanned for the current temperature in TPH detection and TPH-C detection. Area), a detection element (shaded area) that is a scan target of the temporal temperature difference in the first temperature difference determination, and a detection element (shaded area) that is the scan target of the temporal temperature difference in the second temperature difference determination, Each is illustrated.
Further, FIG. 9C shows a detection element (diagonal line) to be scanned at the current temperature in TPH detection and TPH-C detection when the scan reference is the end point ((i, j) = (6,6)). Area), a detection element (shaded area) that is a scan target of the temporal temperature difference in the first temperature difference determination, and a detection element (shaded area) that is the scan target of the temporal temperature difference in the second temperature difference determination, respectively Illustrated.

If the moved scan reference exceeds the set range when the scan reference is moved next, whether the TPH-A count is 1 or more (tph-a ≧ 1) as shown in the flowchart of FIG. Is determined (step S46), and when the TPH-A abnormality is detected, the TPH-A is controlled to be issued from the output unit (step S47).
If there is no TPH-A abnormality detection, it is determined whether there is a TPH-B abnormality by determining whether the TPH-B count is 1 or more (tph-b ≧ 1) (step S48), When the TPH-B abnormality is detected, control is performed so that TPH-B is issued from the output unit (step S49).
If neither TPH-A abnormality detection nor TPH-B abnormality detection is present, it is determined whether there is a TPH-C abnormality by determining whether the TPH-C count is 1 or more (tph-c ≧ 1). If the TPH-C abnormality is detected (step S50), control is performed so that TPH-C is issued from the output unit (step S51).

  Similarly to the first embodiment, when TPH-A abnormality detection, TPH-B abnormality detection, or TPH-C abnormality detection is performed, different types of abnormal temperature detection alarms are issued (TPH-A notification). , TPH-B notification, TPH-C notification), a security guard standing by in the security room, etc., is notified that an abnormal temperature change has occurred in the detection area. The abnormal temperature detection alarm is output not only to a security room or the like where a guard or the like waits but also to a detection area.

Then, an alarm temperature detection alarm is confirmed by a security guard, etc., and a processing for solving the abnormal temperature detection (for example, monitoring image confirmation of the detection area, on-site confirmation, etc.) is performed (step S52). (Step S53), the control unit rewrites the current temperature (t1 [i, j]) for each detection element as the previous temperature (t0 [i, j]) in the control unit. The previous temperature is updated (step S54), and the abnormal temperature detection is terminated.
If there is no TPH-A abnormality detection, TPH-B abnormality detection, or TPH-C abnormality detection, the abnormal temperature detection alarm is not issued, the previous temperature for each detection element is updated (step S54), and the abnormal temperature detection is performed. finish.

  As in the first embodiment, the control unit obtains temperature information for each sensing element at regular intervals (FIG. 6), and at a speed at which the abnormal temperature range spreads based on the temperature information for each sensing element. Abnormal temperature detection (TPH-A abnormality detection, TPH-B abnormality detection, TPH-C abnormality detection) classified according to type is performed (Fig. 7), and different types of abnormal temperature detection alarms are issued (TPH-A issuance). The abnormal temperature in the detection region is detected by performing the notification, the TPH-B notification, and the TPH-C notification (FIG. 8).

It is a block diagram which shows the structure of an abnormal temperature detection apparatus. It is a flowchart which shows the temperature information acquisition process in the abnormal temperature detection method by 1st Example of this invention. It is a flowchart which shows the abnormal temperature detection process in the abnormal temperature detection method by 1st Example of this invention. It is a flowchart which shows the alarm issue process in the abnormal temperature detection method by 1st Example of this invention. It is a figure which shows the structure of the infrared rays detection element (thermopile element) in the abnormal temperature detection apparatus by 1st Example of this invention. It is a flowchart which shows the temperature information acquisition process in the abnormal temperature detection method by 2nd Example of this invention. It is a flowchart which shows the abnormal temperature detection process in the abnormal temperature detection method by 2nd Example of this invention. It is a flowchart which shows the alarm issue process in the abnormal temperature detection method by 2nd Example of this invention. It is a figure which shows the structure of the infrared rays detection element (thermopile element) in the abnormal temperature detection apparatus by 2nd Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Condensing lens 2 Optical filter 3 Infrared detection element 4 Amplification part 5 Temperature detection part 6 Control part 7 Output part 10 Abnormal temperature detection apparatus

Claims (3)

An infrared detection element (3) that receives infrared rays from the detection region and outputs a detection signal having an output level corresponding to the amount of the received light, and for each section of the detection region based on the detection signal output from the infrared detection element A temperature detection unit (5) that acquires a measured temperature, a control unit (6) that detects an abnormal temperature in the detection region based on an output signal from the temperature detection unit, and an abnormal temperature that is controlled by the control unit (6) In the abnormal temperature detection device (10) composed of the output unit (7) that issues a detection alarm,
Based on the output signal sequentially input from the temperature detection unit (5), the control unit (6) acquires temperature information including the current temperature and the temperature difference with time for each section of the detection area, and further, the temperature for each section. Detecting the abnormal temperature based on the information, determining the speed at which the abnormal temperature range expands, and controlling the output unit (7) to issue different types of alarms according to the speed at which the abnormal temperature range expands. An abnormal temperature detector. The temperature of the detection area is measured for each section by an infrared detector that receives infrared light from the detection area and outputs a detection signal with an output level corresponding to the amount of light received, and abnormalities in the detection area based on temperature information for each section In the abnormal temperature detection method that detects the temperature and issues an abnormal temperature detection alarm,
Obtaining temperature information consisting of the current temperature and the temperature difference over time for each section of the detection area;
By detecting the abnormal temperature based on the temperature information for each section and determining the speed at which the abnormal temperature range expands,
An abnormal temperature detection method characterized by performing abnormal temperature detection classified according to the speed at which the abnormal temperature range expands and issuing different types of alarms according to the speed at which the abnormal temperature range expands. Based on the temperature information for each section of the detection area divided into a plurality of sections, in detecting the abnormal temperature and determining the speed at which the abnormal temperature range spreads,
One of the multiple sections is used as the scan reference,
After scanning the current temperature in the scan reference and its one and two adjacent compartments and detecting a compartment above the first temperature level,
A temperature difference with time in the next adjacent section of the scan reference is scanned to determine whether or not the first temperature difference level is exceeded, and the adjacent temperature difference is set to the first temperature difference level. If the temperature difference exceeds the second temperature difference determination that scans the temperature difference with time in the two adjacent sections of the scan reference and determines whether or not the second temperature difference level is exceeded, the TPH with a sudden expansion of the abnormal temperature range -A abnormality and TPH-B abnormality that does not spread rapidly are detected respectively.
TPH-C detection that scans the current temperature in the scan reference and one and two adjacent compartments when the adjacent temperature difference is less than the first temperature difference level, and detects a compartment exceeding the second temperature level. By detecting the TPH-C abnormality, which is very high temperature, but the abnormal temperature range is slow,
The abnormal temperature detection method according to claim 2, wherein abnormal temperature detection classified according to the speed at which the abnormal temperature range spreads is performed, and different types of alarms are issued according to the speed at which the abnormal temperature range spreads.

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