JPH051949A - Fire monitor - Google Patents

Abstract

PURPOSE:To correctly judge a fire by measuring the distance to a fire source with a range finder in real time when the fire source is detected by two-dimensional scanning, correcting the reference value with the measured distance, and comparing it with the detection signal. CONSTITUTION:The detection signal from a two-dimensional scanning type fire detector 100 is converted by an A/D converter then compared with the preset pre-alarm level by a pre-alarm judgment section 26. When the detection signal exceeds this level, a distance measurement controller 27 outputs the drive signal to a distance measurement drive circuit 28, and a range finder 200 is directed toward a fire source by a motor 29. The distance data from the range finder 200 are read by a distance measurement calculation section 30 and outputted to a correction calculation section 31. The calculation section 31 corrects the reference value data 34 stored in advance with the distance data. A comparison judgment section 32 compares the detection signal from the detector 100 with the corrected reference value and judges a fire if the detection signal exceeds the reference value, the occurrence of the fire and its position are displayed on a display section 36, and an acoustic alarm is generated by a warning device 37.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fire monitoring device for two-dimensionally scanning a certain monitoring region to monitor the presence or absence of a fire, and particularly to prevent false alarms due to the difference in the detected fire source position. Fire monitoring device.

[0002]

2. Description of the Related Art Conventionally, as a two-dimensional scanning type fire detector, a mirror scanning type radiation detector disclosed in JP-A-62-255832 is known. A schematic configuration of this fire detector is shown in FIG. 6. The fire detector has a rotating mirror 3 that is driven to rotate by a drive motor 2 attached to a housing 1 of the detector. The optical image is reflected toward the reflection mirror 5, and the subject optical image reflected by the reflection mirror 5 is received by the photoelectric conversion element 6. Although not shown, only the light that has passed through the slit provided between the reflection mirror 5 and the photoelectric conversion element 6 is received by the photoelectric conversion element 6, so that the area of each scanning area is defined. ing.

In the detection operation, the object to be monitored in the monitoring area 4 is scanned along the vertical direction Y by rotating the rotary mirror 3 at a predetermined angular velocity, and a predetermined rotation angle is obtained every time one scan in the vertical direction Y is completed. The casing 1 is rotated in the X direction by another drive motor (not shown). By scanning the monitoring object in the monitoring area 4 along the vertical direction Y with this rotating mirror 3, a so-called dot-sequential scanning is performed within a scanning area which divides the monitoring area 4 finely, and the photoelectric conversion element 6 performs photoelectric conversion. By performing signal processing on the detected signal, it is possible to identify in which scanning area in the monitoring area the fire occurred.

Further, in the monitoring area 4, since the shape of the building is changed and there are various kinds of installed objects having different sizes and shapes, the distance from the detector to the monitored object in each scanning area is constant. Therefore, the detection signal detected for each scanning area is corrected according to the distance. If such a correction process is not performed, for example, if you scan a cigarette fire that is extremely close to the detector, the level of the detection signal will increase, so it will be judged as a fire and a false alarm will be generated. If a flame is located far away from the detector, the level of the detection signal is too small to overlook the fire.

Therefore, a correction process is performed in which a detection signal for a long-distance monitored object is expanded according to the distance, and a detection signal for a short-distance monitored object is reduced according to the distance. When the detection signal of 1 exceeds a predetermined reference value, it is determined that a fire has occurred in the scanning area, and it is attempted to realize a reliable fire determination. Then, in order to correct the detection signal according to such a difference in distance, the distance for each scanning area is measured in advance from the detector, and the correction coefficient inversely proportional to each distance is stored in the storage means. Every other, the predetermined correction coefficient is read in synchronization with the dot-sequential scanning cycle to correct the detection signal by multiplying it by the actual detection signal, or the correction coefficient inversely proportional to the square of each distance is used for correction. Is going.

The same applies when the reference value is corrected by the distance instead of correcting the detection signal by the distance.

[0007]

However, in such a fire monitoring device using the conventional two-dimensional scanning type fire detector, the fire determination level (reference value) based on the distance to each scanning area and The correction coefficient is set based on a linear relational expression or a quadratic relational expression, but the internal structure of the building is complicated or the installation is dependent on the sectional shape inside the building shown in Fig. 7. When the distance from the monitoring device changes in various ways due to the complicated unevenness, as shown in FIG. 8, the distance A to the monitored object with respect to the scanning rotation angles θA to θE of the monitoring device is increased.
There is a problem that the change of E becomes complicated, and the correction coefficient obtained by the linear or quadratic relational expression cannot perform accurate correction for each fine scanning area.

In order to perform accurate correction, the distance from the detector to each finely divided scanning area is actually measured or obtained from design data, and the distance is stored in a memory using the position coordinates indicating the scanning area as an address. There is a problem that it requires enrollment work and enormous effort is required to create distance data. The present invention has been made in view of the above-mentioned conventional problems, and eliminates the need for the work such as the actual measurement of the distance in advance and realizes the accurate correction by measuring the distance in real time when the fire source is detected. An object is to provide a fire monitoring device using a three-dimensional scanning fire detector.

[0009]

To achieve this object, the present invention is constructed as follows. The reference numerals in the drawings of the embodiments are also shown. First, the present invention is a two-dimensional scanning type fire in which a surveillance area is divided into fine scanning areas, and a fire source is detected from a detection signal detected by scanning each scanning area to determine the presence or absence of a fire. The target is a fire monitoring device including the detector 100.

In the present invention as such a fire monitoring device, a range finder 200 for measuring the distance to the fire source is arranged integrally with or in the vicinity of the two-dimensional scanning fire detector 100.
And a distance measurement control unit 27 that directs the rangefinder 200 to the detected fire source position to perform the distance measurement operation when the detection signal of the two-dimensional scanning fire detector 100 exceeds a predetermined pre-alarm reference value, A correction calculation unit 31 that corrects a predetermined reference value for fire determination based on the distance to the fire source position measured by the distance meter 200, a correction reference value corrected by the correction calculation unit 31, and a two-dimensional scanning fire. It is characterized by including a comparison / determination unit 32 for determining a fire by comparison with a detection signal of the detector 100.

Here, the distance measurement control unit 27 can measure the distance between the fire source detection position and a plurality of surrounding points (multipoint distance measurement), and measure the distance to the fire source position by averaging the measured values. desirable. When a reflection type distance meter 200 is used, the distance measurement control unit 27 measures the distance to a position offset by a predetermined amount near the root of the flame at the fire source detection position.

Further, the correction calculation unit 31 corrects the detection signal of the two-dimensional scanning fire detector 100 based on the distance to the fire source position, and the comparison and judgment unit 32 compares the corrected detection signal with a predetermined reference value. You may judge a fire by comparison. Further, when the detection signal of the two-dimensional scanning fire detector 100 exceeds a predetermined pre-alarm reference value and the position of the fire source is within a predetermined non-judgment area, distance measurement and fire judgment are prohibited. The non-judgment area determination unit 33 is provided.

[0013]

According to the present invention having such a configuration, when the detection signal exceeds the reference value of the pre-alarm level lower than the original fire judgment level and the fire source position is detected, the range finder is used as the fire source. Point to the position and measure the distance in real time,
Based on the measured distance, for example, the reference value is corrected to make a comparison judgment with the detection signal of the two-dimensional scanning fire detector, and the distance is measured in advance for each scanning area and the distance and the correction coefficient are registered in the memory. Even if a large surveillance area such as a large space structure is finely divided and scanned, it is possible to accurately measure the distance according to the situation of the installation objects in the area and make a highly accurate correction, and judge the fire. The reliability of can be further improved.

[0014]

FIG. 1 is an explanatory view showing an embodiment of a two-dimensional scanning type fire detector and range finder used in the fire monitoring apparatus of the present invention. In FIG. 1, reference numeral 100 denotes a two-dimensional scanning type fire detector, which is fixedly installed on a supporting base 16 which is rotatable in a horizontal direction by a motor built in the base 7. A distance meter 200 is installed on the left side of the support base 16, and in this embodiment, the distance meter 200 is rotatably provided within a predetermined vertical range by a motor 29.

First, the two-dimensional scanning type fire detector 100 will be described as follows. Two-dimensional scanning fire detector 100
A rotating mirror 10 that is driven to rotate by a motor 9 is provided in the housing 8 of the rotating mirror 10. The rotating mirror 10 reflects an optical image of a subject incident from the monitoring area 11 to the reflecting mirror 12 side, and further is reflected by the reflecting mirror 12. The subject optical image is subjected to the photoelectric conversion element 1 through the slit 13 and the relay lens 14.
5 is receiving light.

Here, only the light that has passed through the slit 13 is received by the photoelectric conversion element 15, so that the area of the scanning area AR is defined. The operation of the two-dimensional scanning fire detector 100 scans the inside of the monitoring region 11 along the vertical direction Y by rotating the rotating mirror 10 by the motor 9 at a predetermined angular velocity, and is set to, for example, 0 ° to 90 °. Each time the scanning in the vertical direction Y is completed, a predetermined rotation angle Δθx
Only by rotating the support base 16 horizontally, the so-called dot-sequential scanning is performed by dividing the inside of the monitoring region 11 into finely divided scanning regions, and the detection signal photoelectrically converted by the photoelectric conversion element 15 is sent to the control device 300 side. Output.

Next, the rangefinder 200 will be described. Rangefinder 20
As 0, for example, a laser rangefinder can be used. The laser rangefinder can measure a distance by emitting a laser pulse from a semiconductor laser toward an object and detecting reflected light of the laser pulse with a light receiving unit. Although the resolution of the measurement distance is determined by the distance measurement optical system, the measurement distance of the monitoring area required by the present invention does not exceed 1000 meters, and therefore it is within the measurement capability of a normal laser distance meter. It is possible to obtain a highly accurate range resolution of 1 millimeter.

A laser rangefinder is most preferable in terms of distance resolution and reliability, but a focus detection optical meter used for autofocusing of a camera is used in addition to this, and an object to be detected is controlled by autofocus control. A method of measuring the distance from the driving amount of the lens in the focusing control by controlling the focusing may be used. Of course, an appropriate range finder such as an optical range finder other than a laser or a range finder using ultrasonic waves can be used.

In this embodiment, the range finder 200 is mounted on the support 16 of the two-dimensional scanning fire detector 100, and rotates horizontally on the base 7 integrally with the two-dimensional scanning fire detector 100. Being scanned. Further, the motor 29 can be independently rotated around the support base 16 in a vertical direction, and in the steady monitoring state, the two-dimensional scanning fire detector 1
A center position P of 00 in the vertical direction Y is oriented.

FIG. 2 is a two-dimensional scanning fire detector 10 of FIG.
It is explanatory drawing which showed the positional relationship of 0 and the rangefinder 200 with respect to the fire source of the monitoring area. In FIG. 2, the monitoring area 1 is now
Assuming that the fire source 400 is generated by the fire at the specific position of 1, the two-dimensional scanning fire detector 100 detects the fire source 400 by increasing the level of the detection signal obtained when the fire source 400 is scanned. . When the fire source 400 is detected in this way, the two-dimensional scanning fire detector 100 stops horizontal rotation, that is, scanning in the X direction, and repeats scanning in the vertical direction Y including the fire source 400. Detection of such a fire source 400 is 2
Rangefinder 200 when done with a three-dimensional scanning fire detector 100
Is activated, the position coordinate (X, Y) of the detection position of the fire source 400 by the two-dimensional scanning fire detector 100 is received, the rangefinder 200 is scanned so as to be directed to this position coordinate, and the distance measurement operation is performed after the scanning. I do.

Usually, the detection of the fire source 400 by the two-dimensional scanning type fire detector 100 is obtained with the optical axis A of the two-dimensional scanning type fire detector 100 being oriented substantially at the center of the fire source 400.
When the rangefinder 200 is pointed to the exact same fire source detection position,
As shown in B ', the position ahead of the fire source 400 is measured. Therefore, in the present invention, the optical axis B is offset by a predetermined amount so that the optical axis B of the rangefinder 200 is directed to the root of the flame in the fire source 400 with respect to the optical axis A of the two-dimensional scanning fire detector 100. I have installed it.

Further, since accurate distance information cannot be obtained by measuring one point with respect to the fire source 400 with the range finder 200, for example, the position of the optical axis B offset from the optical axis A with respect to the fire source detection position is used as a reference. In addition, the reliability of the measurement distance to the fire source 400 is improved by measuring the distances at several points around the circumference and obtaining the average value of the measurement distances.

FIG. 3 is a block diagram of an embodiment showing one embodiment of the present invention. In FIG. 3, reference numeral 20 denotes a microprocessor (hereinafter referred to as “MPU”), and the control device 30 of FIG.
It is provided on the 0 side. A scanning control unit 21 realized by program control is provided in the MPU 20, and the scanning control unit 21 outputs a main scanning signal Dx and a sub scanning signal Dy. The main scanning signal Dx is given to the main scanning drive circuit 22 to drive the motor 23 provided on the base 7 side of FIG.
The two-dimensional scanning fire detector 100 is reciprocally rotated within a predetermined horizontal range. Further, the sub-scanning signal Dy is given to the motor 9 via the sub-scanning drive circuit 24 to rotate the rotary mirror 10 at a constant angular velocity as shown in FIG.

The detection signal from the two-dimensional scanning fire detector 100 is converted into digital data by the A / D converter 25 and then read into the MPU 20. The detection signal read by the MPU 20 is first given to the pre-alarm determination unit 26, compared and determined with a predetermined pre-alarm level, and when the pre-alarm level is exceeded, it is determined that a fire source has been detected, and distance measurement control is performed. The section 27 is activated. Further, the pre-alarm determination unit 26 notifies the distance measurement control unit 27 of the fire source position coordinates (X, Y) obtained from the scanning control unit 21 when the fire source is detected.

The distance measurement control unit 27 receives the judgment output of the pre-alarm level judgment unit 26 and the fire source position coordinates (X,
Y) to output a drive signal to the distance measurement drive circuit 28,
The motor 29 directs the rangefinder 200 on the support 16 to the detected fire source position (X, Y) as shown in FIG. In the embodiment of FIG. 1, since the rangefinder 200 is mounted on the same support 16 as the two-dimensional scanning fire detector 100 in the horizontal X direction, the rangefinder 20
It is not necessary to scan 0 in the X direction, and the motor 29 is driven based on the fire source detection position coordinates (X, Y) only in the vertical direction Y.

In addition to directing the rangefinder 200 to the fire source detection position coordinates (X, Y), the distance measurement control unit 27 also sets the position with respect to the optical axis A defined by the fire source detection coordinates as shown in FIG. Control is also performed to direct the base position of the flame of the fire source 400 determined by the quantitatively offset optical axis B, and if necessary, multipoint distance measurement is performed to direct several points around the flame base offset position. .

The distance data from the rangefinder 200 is read by the distance measurement calculation unit 30 every time the distance measurement control unit 27 completes one or more motors 29 for distance measurement. The correction calculation unit 3 corrects the distance data as an average value of the specific data obtained by distance measurement or multi-point distance measurement.
Output to 1. The correction calculation unit 31 obtains reference value data corrected based on the distance data from the reference value data 34 stored in advance in the memory 40, and records the reference value data in the comparison determination unit 32.

FIG. 4 shows an example of the reference value data 34 stored in the memory 40. The reference voltage value (reference value) shown on the vertical axis is the square of the distance with respect to the increase of the distance shown on the horizontal axis. It is set to a value that decreases in inverse proportion. Therefore, in the correction calculation unit 31, the reference value data 34 stored in the memory 40 as table data based on FIG. 4 is accessed, and the reference value data corresponding to the distance data at this time,
That is, the reference voltage value is read and output to the comparison / determination unit 32.

In the comparison and judgment section 32, the two-dimensional scanning fire detector 1 obtained via the pre-alarm judgment section 26
The detection signal from 00 and the reference value corrected according to the distance by the correction calculation unit 31 are compared, and when the detection signal is equal to or higher than the reference value, it is determined that there is a fire. The fire judgment output by the comparison judgment unit 32 is displayed on the display unit 36 together with the fire source position coordinates at that time.
The fire occurrence and the fire occurrence position are displayed on the display unit 36. Of course, a CRT display may be used as the display unit 36, and the fire source position may be indicated by lighting or flicker display in the image showing the monitored area. At the same time, the judgment output of the fire is given to the alarm device 37, and an acoustic fire alarm is given by ringing a bell or the like.

Further, in the MPU 20, a non-judgment area judgment unit 3
3 is provided, and when the fire source is detected by the pre-alarm determination unit 26, the position coordinate (X, Y) of the fire source obtained by the scan control unit 21 at that time is used as the non-determination region data 3
5, if it is a non-judgment area defined by the non-judgment area data 35, even if the detection signal of the two-dimensional scanning fire detector 100 exceeds the pre-alarm level, it is not judged to be a fire source, and the distance measurement control unit The distance measuring operation by 27 and the fire judging operation by the comparison and judgment section 32 are prohibited.

The non-judgment area data 35 used for the judgment by the non-judgment area judgment unit 33 is registered in the memory 40 in advance. That is, there is an area that emits strong radiant light, such as the reflected light of the sun, regardless of the fire in the monitored area, and even if a detection signal that exceeds the pre-alarm level is obtained for such an area, the fire judgment Since it is meaningless to perform the above, it is preliminarily examined as a non-judgment area data 35 of the memory 40 by checking a non-judgment area in which a fire judgment is not required even if the detection signal in the monitoring area exceeds the pre-alarm level. When the pre-alarm determination unit 26 determines that the detection signal exceeds the pre-alarm level, the non-determination region determination unit 33 matches the non-determination region data 35 with each other so that unnecessary fire determination is not performed. I have to.

FIG. 5 is a flow chart showing the processing operation of the embodiment of the present invention shown in FIG. In FIG. 5, first in step S1 (hereinafter “step” is omitted),
The two-dimensional scanning fire detector 100 is initialized to the first reference scanning area in the monitoring area 11, that is, the origin coordinates in the main and sub-scanning directions, and scanning in the main and sub-scanning directions is started.

When the scanning of the monitoring area 11 is started, the detection signal from the two-dimensional scanning fire detector 100 is read in S2 for each scanning of each scanning area, and it is determined in S3 whether or not it is equal to or higher than the pre-alarm level. If it is not at or above the pre-alarm level, the process proceeds to S11, the XY coordinates are updated to the next, and the processes of S2 and S3 are repeated. When it is determined in S3 that the detection signal has reached the pre-alarm level or higher, the process proceeds to S4, and the position coordinates (X, Y) and the detection signal at this time are stored.

Subsequently, in S5, it is determined whether or not it is the non-judgment area. If it is the non-judgment area, the processing in and after S6 is not performed, and S11 is executed.
Then, the XY coordinates are updated and the process proceeds to the next area. S
If it is not in the non-judgment area in 5, the process proceeds to S6 to perform the distance measuring operation. This range-finding operation includes offset range-finding in which the rangefinder 200 is directed to the base of the flame of the detected fire source with respect to the detected position coordinates (X, Y) of the detected fire source, and multipoint range-finding in which the rangefinder 200 is directed to several points. To do.

Subsequently, the distance to the fire source is detected in S7, and S
In 8, the correction of the reference value based on the detection distance is performed using the reference value data shown in FIG. 4, for example. Next, in S9, the detection signal obtained as raw data from the two-dimensional scanning fire detector 100 and detected in S4 is compared with the reference value corrected based on the detection distance in S8. If so, the process proceeds to S10, it is determined that there is a fire, a fire output is generated, and a fire alarm is displayed on the display unit 36 and the alarm device 37. Of course, S
If the detected value is smaller than the reference value in 9, the fire output is not performed and the process proceeds to S11 to update the XY coordinates and proceed to the process of the next area.

In the correction calculation unit 31 of FIG. 3, the reference value is corrected based on the distance data obtained from the distance measurement calculation unit 30, but instead of correcting the reference value, the correction value is set to 2 The detection signal from the dimensional scanning fire detector 100 is multiplied by a correction coefficient according to the distance to correct the detection signal itself to a value excluding the attenuation due to the distance, and the corrected detection signal is determined by the comparison / determination unit 32 in a predetermined manner. You may make it compare with the reference value of. In this case, the correction coefficient of the detection signal may be, for example, the characteristic shown in FIG. 4, which has a small characteristic when the distance is short and has an inverse characteristic which increases as the distance increases.

The correction of the reference value in the above embodiment uses the characteristics shown in FIG. 4 as table data in the memory 40.
Although a lookup table method is adopted in which the corrected reference value data stored in the memory is read out and the corresponding corrected reference value data is read, the corrected reference value may be obtained by calculation using the measured distance as a parameter. Of course.

Further, in the above embodiment, the case where the two-dimensional scanning fire detector 100 is used also as the mirror scanning radiation detector as shown in FIG. 1 is taken as an example. Alternatively, as the two-dimensional scanning type fire detector 100, a semiconductor image detector using a CCD or the like may be used. That is, the monitoring area 11 shown in FIG.
An image is formed on the image pickup surface of D by an optical system, and one or more CCs are formed.
The detection signal may be obtained by performing XY scanning in units of D pixels.

[0039]

As described above, according to the present invention, when a fire source is detected by two-dimensional scanning by dividing the surveillance area into fine scanning areas, the distance to the fire source detection position is determined. Measures in real time with a rangefinder, corrects the reference value according to the measured distance, and judges the fire by comparing with the detection signal, so accurate fire judgment can be made even if the distance changes,
Eliminates the enormous work of registering correction data and correction coefficients in memory by actually measuring the distance for each finely divided scanning area, significantly shortening the preparation period required to create the device, and installing in the warning area Even if the object is changed, it is possible to detect the distance and detect the fire accurately without requiring special work.

[Brief description of drawings]

FIG. 1 is an explanatory view of a two-dimensional scanning fire detector and a distance meter used in the present invention.

FIG. 2 is an explanatory diagram showing the positional relationship of the two-dimensional scanning fire detector and rangefinder of FIG. 1 with respect to the fire source in the monitored area.

FIG. 3 is a configuration diagram of an embodiment showing an embodiment of the present invention.

FIG. 4 is a characteristic diagram of a reference voltage value with respect to a distance used in the present invention.

FIG. 5 is a flowchart showing the processing operation of the present invention.

FIG. 6 is a schematic configuration diagram of a conventional two-dimensional scanning fire detector.

FIG. 7 is a vertical cross-sectional explanatory view when an installation object is present in the monitoring area.

8 is a characteristic diagram showing the relationship between the detector rotation angle and the distance with respect to the monitoring area in FIG.

[Explanation of symbols]

100: Two-dimensional scanning fire detector 200: Distance meter 300: Control device 400: Fire source 7: Base 8: Case 9,23,29: Motor 10: Rotating mirror 11: Monitoring area 12: Mirror 13: Slit 14: Relay lens 15: Photoelectric conversion element 16: Support stand 20: Microprocessor (MPU) 21: Scan control unit 22: Main scanning drive circuit 24: Sub-scanning drive circuit 25: A / D converter 26: Pre-alarm determination section 27: Distance measurement control unit 28: Distance measurement drive circuit 30: Distance calculation unit 31: Correction calculation unit 32: Comparison judgment part 33: Non-judgment area judgment unit 34: Reference value data 35: Non-judgment area data 36: Display 37: Alarm device

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Teruo Iwata             2-1043 Kamiosaki, Shinagawa-ku, Tokyo Ho             Chiki Co., Ltd. (72) Inventor Kazumasa Shimizu             75-1 Hasunumacho, Itabashi-ku, Tokyo             In Pucon (72) Inventor Toshiaki Yoshizaki             75-1 Hasunumacho, Itabashi-ku, Tokyo             In Pucon

Claims (5)

[Claims] 1. A two-dimensional scanning fire in which a fire source is detected by detecting a fire source from a detection signal detected by scanning each scanning area by dividing a surveillance area into fine scanning areas. In a fire monitoring device equipped with a detector, the above 2
A distance meter that is arranged integrally with or in the vicinity of the two-dimensional scanning fire detector to measure the distance to the fire source, and the distance when the detection signal of the two-dimensional scanning fire detector exceeds a predetermined pre-alarm reference value. A distance measurement control unit that directs the meter to the detected fire source position to perform a distance measurement operation, and corrects a predetermined reference value for fire determination based on the distance to the fire source position measured by the distance meter. A fire monitoring system comprising: a correction calculation unit; and a comparison determination unit that determines a fire by comparing a correction reference value corrected by the correction calculation unit and a detection signal of the two-dimensional scanning fire detector. apparatus. 2. The fire monitoring device according to claim 1, wherein the distance measurement control unit causes the fire source detection position and distances of a plurality of surrounding points to be measured, and the fire source position is calculated by averaging the measured values. Fire monitoring device characterized by measuring the distance of. 3. The fire monitoring device according to claim 1, wherein when the reflection type is used as the range finder, the distance measurement control unit is offset by a predetermined amount near the root of the flame at the detection position. Fire monitoring device characterized by measuring the distance to. 4. The fire monitoring device according to claim 1, wherein the correction calculation unit corrects a detection signal of the two-dimensional scanning fire detector based on a distance to a fire source position, and the comparison / determination unit. Is a fire monitoring device characterized by judging a fire by comparing a corrected detection signal with a predetermined reference value. 5. The fire monitoring apparatus according to claim 1, wherein when the detection signal of the two-dimensional scanning fire detector exceeds a predetermined pre-alarm reference value, the position of the fire source is a predetermined non-judgment. A fire monitoring device comprising a non-judgment area judgment unit for prohibiting the distance measurement and the fire judgment when in the area.