JPH0915064A - Temperature monitor and monitoring method - Google Patents

Abstract

PURPOSE: To monitor the temperature at a plurality of temperature detecting parts accurately using a simple, safe and inexpensive apparatus. CONSTITUTION: A temperature detection seal 11 comprising a temperature- sensitive part 12 where the luminance varies when the temperature at a temperature detecting part reaches a luminance variation point, and a temperature insensitive part 13 where the luminance does not vary corresponding to the temperature within a temperature monitoring range is provided at the temperature detecting part. Luminance at the temperature-sensitive part 12 and the temperature insensitive part 13 is then detected while being sectioned into a plurality of pixels by means of a camera 10 and subjected to signal processing at a numeric processing section 23. The signal processing is carried out by comparing a decision reference value, based on the mean luminance at the temperature-sensitive and temperature insensitive parts, with a threshold luminance being set from the relational data of the illuminance and distance L of temperature detecting part and the decision reference levels before and after variation of luminance stored in a reference data memory 25. An abnormality judging signal is outputted when the judging reference level exceeds the threshold luminance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is associated with, for example, the temperature of piping and tank surfaces of plants in chemical plants and stockpiling facilities for oil, etc., abnormal heating of switchboards, control panels, etc. in electric power equipment, and combustion of lead-in cables. The present invention relates to a temperature monitoring method and a temperature monitoring device for monitoring a temperature rise and the like.

[0002]

2. Description of the Related Art For example, when the temperature of a plant in a chemical factory or a stockpiling facility for petroleum, etc. rises abnormally, abnormal heating of a switchboard or control panel in a power facility, combustion of a lead-in cable, etc. occur, Because of the danger, temperature monitoring is performed in advance to detect an abnormal rise in temperature in such a dangerous area.

As one of them, it is general practice to directly measure the temperature of the temperature-detected portion in the temperature monitoring region by a thermocouple sensor. Further, the temperature is monitored by detecting infrared rays radiated from a temperature detection target by an infrared camera.

Furthermore, recently, as shown in FIG. 9, a thermo-seal 38, etc., which changes the color when the temperature reaches a set temperature corresponding to the temperature of the temperature-detected portion, is provided with the equipment 14 to be monitored.
The light from the light source 39 is applied to the thermoseal 38 through the optical fiber 40a, and the reflected light reflected by the thermoseal 38 is received by the optical fiber 40b on the receiving side to change the color of the reflected light. A method (Japanese Patent Laid-Open No. 3-92737) for detecting the temperature change of the equipment 14 to be monitored based on the above is also proposed.

[0005]

However, each of the above-mentioned conventional methods has the following problems. For example, in the temperature monitoring method using a thermocouple sensor, although the temperature detection accuracy is excellent, when trying to increase the number of temperature measurement points, the signal line becomes congested, the sensor terminal processing becomes complicated, and further, the signal processing There was a problem that the department became large. In addition, signal line congestion in power equipment under high voltage may cause discharge and the like, which is a very serious safety problem. Furthermore, since the temperature measurement by the thermocouple sensor is performed in spots, it is necessary for a temperature monitor to go to the temperature monitoring area in order to confirm the state when an abnormal temperature rise is detected. There is also a problem that when a person goes to a dangerous area such as a high voltage transformer of a substation facility of an electric power company to check for an abnormality, a human risk is involved.

On the other hand, in the temperature monitoring method using the infrared camera, since it is possible to measure the temperature over the entire temperature monitoring region of the monitored equipment 14, the abnormal temperature rise of the equipment is effectively detected. However, since the infrared camera is very expensive, there is a problem that the cost of the temperature monitoring device becomes high. Further, there is a problem that the image detected by the infrared camera is dark except for the portion where the temperature of the monitored equipment 14 becomes high, and it is difficult to confirm the details of the monitored equipment 14.

Furthermore, in the method of detecting the temperature by detecting the color change of the thermo-seal 38, unlike the method of using the thermocouple sensor, no electricity is required in a certain area of the equipment 14 to be monitored, and the explosion-proof specification is set. Although there is an advantage that can be dealt with,
Similar to the method using the thermocouple sensor, if an attempt is made to increase the number of temperature measurement points, the optical fibers 40a and 40b as signal lines will be used.
However, there was a problem that the sensor terminal processing became complicated due to congestion. Further, since the optical fibers 40a and 40b have a transmission loss, depending on the transmission path length of the optical fibers 40a and 40b,
There is also a problem that the sensitivity of the light receiving element needs to be corrected, and the number of adjustment man-hours is large, which is very difficult.

The present invention has been made in order to solve the above-mentioned conventional problems, and an object of the present invention is to prevent congestion of a signal line or the like even if the temperature is measured at a plurality of points in a temperature monitoring area. It is an object of the present invention to provide a temperature monitoring method and a temperature monitoring device that can perform temperature monitoring in a temperature monitoring region easily and at low cost without taking up a risk such as associated discharge and occupying a small space.

[0009]

In order to achieve the above object, the present invention is constructed as follows. That is, the first invention of the temperature monitoring device is provided in the temperature detected part in the temperature monitoring region, and changes the brightness after the temperature of the temperature detected part reaches the brightness change temperature within the monitored temperature range. A temperature insensitive region for performing a temperature insensitive region, which is divided into the brightness of the temperature sensitive change member and the temperature sensitive change member and has no brightness change corresponding to at least the temperature within the monitoring temperature range. And a luminance detection unit having a plurality of pixels for detecting the luminance with an imaging camera, and based on a detection signal of the luminance detection unit, an average value of the luminance of the region of the temperature-sensitive change body occupying the plurality of pixels is calculated. Obtained as the average value of the luminance of the sensitive area, while
An average value calculation unit that obtains the average value of the brightness of the temperature insensitive area occupying the plurality of pixels as an insensitive section brightness average value, and is given in advance based on the insensitive section brightness average value and the insensitive section brightness average value. A reference value determination unit that obtains a determination reference value obtained by the method described above, and an abnormality that outputs an abnormality determination signal when the determination reference value exceeds the luminance threshold value by comparing the determination reference value with the set luminance threshold value. It is characterized in that a judging section is provided.

Further, the brightness threshold value is a reference value for determination before brightness change obtained by a method given in advance based on the average brightness value of the insensitive part and the average brightness value of the insensitive part before the brightness change, and the average brightness of the insensitive part. The temperature monitoring is also provided by providing a threshold value determining unit for setting a value within a range between the reference value for determination after luminance change obtained by a method given in advance based on the value and the average luminance value of the sensitive unit after luminance change. This is a characteristic configuration of the first invention of the apparatus.

Further, the first relationship data between the illuminance of the temperature detected part and the brightness average value of the insensitive part corresponding to the illuminance, the distance from the temperature detected part to the imaging camera and the illuminance of the temperature detected part. A relational data storage unit to which second relational data of the judgment reference value before and after the luminance change corresponding to these illuminance and distance is given; and an insensitive portion luminance average value obtained based on the detection signal of the luminance detection unit And an illuminance determining unit that obtains the illuminance of the temperature detected unit at the time of brightness detection from the first relational data; the illuminance obtained by the illuminance determining unit, the distance from the temperature detected unit to the imaging camera, and the second It is also a characteristic configuration of the first invention of the temperature monitoring device that a threshold correction unit that determines the reference value for determination before and after the brightness change based on the relational data and corrects the brightness threshold is provided. ing.

Further, the second invention of the temperature monitoring device is
A temperature sensitive change body that is provided in the temperature detection part of the temperature monitoring region and changes the color component ratio after the temperature of the temperature detection part reaches the color component change temperature within the monitoring temperature range; An image pickup camera for photographing the color component ratio of the temperature-sensitive change member and the color component ratio of the temperature-insensitive region which is divided from the temperature-sensitive change member and does not change at least corresponding to the temperature within the monitoring temperature range. A color component detection unit having a plurality of pixels detected by the color component detection unit, and based on a detection signal of the color component detection unit, the average value of the color component ratios of the regions of the temperature-sensitive change body occupying the plurality of pixels is detected. An average value calculation unit that obtains an average value of color component ratios of the temperature insensitive areas occupying the plurality of pixels as an average value of insensitive portion color components, and an average value calculation unit of the insensitive portion color component averages Value and the average value of insensitive area color components Then, a reference value determination unit that obtains a determination reference value obtained by a predetermined method, and the determination reference value is compared with a set color component ratio threshold value, and the determination reference value exceeds the color component ratio threshold value. It is characterized in that it is provided with an abnormality determination section that outputs an abnormality determination signal.

Further, the color component ratio threshold value is a reference value for determination before color component change, which is obtained by a method given in advance based on the insensitive part color component average value and the insensitive part color component average value before the color component ratio change. And a reference value for determination after color component change determined by a method given in advance based on the average value of insensitive part color components and the average value of insensitive part color components after changing the color component ratio. Providing a threshold value determining unit to be set is also a characteristic configuration of the second invention of the temperature monitoring device.

Further, the first relationship data between the illuminance of the temperature detected part and the average value of the color components of the insensitive part corresponding to the illuminance, the distance from the temperature detected part to the imaging camera and the illuminance of the temperature detected part. And a relational data storage unit provided with second relational data of the judgment reference value before and after the change of the color component ratio corresponding to these illuminance and distance; and an insensitivity obtained based on the detection signal of the color component detection unit. An illuminance determining unit that obtains the illuminance of the temperature detected unit at the time of detecting the color component ratio from the partial color component average value and the first relational data; the illuminance determined by the illuminance determining unit and the temperature detected unit to the imaging camera Of the temperature monitoring device, a threshold correction unit that corrects the color component ratio threshold by obtaining a determination reference value before and after the change of the color component ratio based on the distance and the second relational data. Two
The invention has a characteristic configuration.

Further, on the surface side of the temperature sensitive change body,
It is also a characteristic configuration of the temperature monitoring apparatus of the present invention that a semi-spherical or semi-cylindrical transparent lens body is provided to make the temperature-sensitive variable body expand and look due to the lens effect.

Further, the first invention of the temperature monitoring method is as follows:
In the temperature detection part of the temperature monitoring region, a temperature sensitive changer that changes the brightness after the temperature of the temperature detection part reaches a brightness change temperature within the monitoring temperature range, and at least a temperature within the monitoring temperature range. Correspondingly, the temperature-insensitive areas with no change in brightness are arranged separately, and the brightness of these temperature-sensitive change bodies and the temperature-insensitive areas are detected by dividing them into multiple pixels using an imaging camera. , The average value of the luminance of the region of the temperature-sensitive changing body occupying the plurality of pixels is obtained as the sensitive portion luminance average value, while the average value of the luminance of the temperature-insensitive region occupying the plurality of pixels is the insensitive portion Obtained as a luminance average value, and thereafter, a determination reference value is obtained by a method given in advance based on the sensitive portion luminance average value and the insensitive portion luminance average value, and the luminance threshold value to which the determination reference value is set. Reference value for judgment compared with It is configured as characterized in that outputs an abnormality determination signal when exceeding the luminance threshold.

Further, the brightness threshold value is a reference value for determination before brightness change obtained by a method given in advance based on the average brightness value of the insensitive part and the average brightness value of the insensitive part before the brightness change, and the average brightness of the insensitive part. It is also possible to set a value within a range between the value and the reference value for determination after brightness change obtained by a method given in advance based on the average value of the sensitive area brightness after the brightness change. It is a characteristic configuration of the invention.

Further, from the first relationship data between the illuminance of the temperature detected part and the average brightness value of the insensitive part corresponding to the illuminance and the average brightness value of the insensitive part, the illuminance of the temperature detected part at the time of brightness detection. Then, the obtained illuminance, the distance information from the temperature detected part to the imaging camera, the distance from the temperature detected to the imaging camera, the illuminance of the temperature detected part, and these illuminances and distances It is also a characteristic of the first invention of the temperature monitoring method that the reference value for determination before and after the change in brightness is obtained based on the second relational data of the reference value for determination before and after the change in brightness and the brightness threshold value is corrected. It is configured.

Further, the second invention of the temperature monitoring method is
A temperature sensitive changer that changes a color component ratio after the temperature of the temperature detected portion reaches a color component change temperature within the monitored temperature range, and at least within the monitored temperature range. The temperature-insensitive area where the color component ratio does not change according to the temperature of the temperature sensitive area is divided and arranged, and the color component ratio of these temperature-sensitive change body and temperature-insensitive area is divided into multiple pixels using an imaging camera. Then, the average value of the color component ratios of the regions of the temperature-sensitive change body occupying the plurality of pixels is obtained as an average value of the color components of the sensitive portion, while the temperature insensitivity occupying the plurality of pixels is detected. The average value of the color component ratios of the areas is obtained as the insensitive part color component average value, and thereafter, the judgment criterion is determined by a method given in advance based on the insensitive part color component average value and the insensitive part color component average value. Obtain the value and set the judgment reference value It is configured as characterized in that outputs an abnormality determination signal when determining the reference value as compared with the constant being the color component ratio threshold exceeds the color component ratio threshold.

Further, the color component ratio threshold value is determined by a method given in advance based on the insensitive part color component average value and the insensitive part color component average value before the change of the color component ratio. Set within the range between the value and the reference value for post-color component change determination, which is obtained by a method given in advance based on the average value of the insensitive part color components and the average value of the insensitive part color components after the change of the color component ratio. This is also a characteristic configuration of the second invention of the temperature monitoring method.

Further, from the first relational data of the illuminance of the temperature detected part and the average value of the insensitive part color components corresponding to the illuminance and the average value of the insensitive part color components, the temperature difference at the time of detecting the color component ratio is detected. The illuminance of the detector is calculated, and after that, the calculated illuminance,
Distance information from the temperature-detected part to the imaging camera, distance information from the temperature-detected part to the imaging camera, illuminance of the temperature-detected part, and judgment reference values before and after the change of the color component ratio corresponding to these illuminance and distance It is also a characteristic configuration of the second invention of the temperature monitoring method that the reference value for determination before and after the change of the color component ratio is obtained based on the second relational data of (1) to correct the color component ratio threshold value. .

[0022]

In the first aspect of the temperature monitoring method and apparatus having the above-described structure, the brightness of the temperature sensitive change body and the brightness of the temperature insensitive area provided in the temperature detection part are divided into a plurality of pixels by the image pickup camera. Based on this detection signal, the average value of the luminance of the region of the temperature-sensitive change body occupying a plurality of pixels is obtained as the sensitive portion luminance average value, while the temperature insensitive region occupying the plurality of pixels is obtained. The average value of the luminance of is obtained as the average value of the insensitive portion luminance. And
Based on the average luminance value of the sensitive area and the average luminance value of the insensitive area,
The reference value for determination is obtained by the method given in advance,
This judgment reference value is compared with, for example, a brightness threshold value that is set based on the average brightness value of the insensitive section and the average brightness value of the sensitive section before and after the brightness change. The judgment signal is output.

Further, in the second aspect of the temperature monitoring method and apparatus, the color component ratio of the temperature sensitive change body and the color component ratio of the temperature insensitive region provided in the temperature detection part are set by the imaging camera to be plural. It is divided into pixels and detected.
The average value of the color component ratios of the regions of the temperature-sensitive change body occupying the plurality of pixels is obtained as the average value of the sensitive portion color components, while the average value of the color component ratios of the temperature-insensitive regions occupying the plurality of pixels is The average value of the insensitive portion color components is obtained, and the determination reference value is obtained by a previously given method based on the average value of the insensitive portion color components and the average value of the insensitive portion color components. Then, this reference value for determination is compared with, for example, a color component ratio threshold value set based on the insensitive part color component average value and the insensitive part color component average value before and after the color component ratio change,
When the determination reference value exceeds the color component ratio threshold value, an abnormality determination signal is output.

As described above, according to the present invention, since the abnormality determination of the temperature-detected portion is made based on the luminance and the color component ratio detected by the image pickup camera, there is no need for an expensive device such as an infrared camera. Temperature is also monitored,
Abnormality determination is performed based on whether or not the judgment reference value based on the average luminance value of the sensitive area and the average luminance value of the insensitive area exceeds the luminance threshold, or the average value of the color components of the sensitive area and the average value of the color components of the insensitive area. Even if the illuminance in the temperature monitoring area changes due to the weather, etc., the change in the reference value for judgment based on and is not affected by the change and the temperature abnormality is accurately detected. A decision is made.

[0025]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a main configuration of a control unit of a temperature monitoring device according to the present invention. As shown in the figure, the temperature monitoring device of the present invention includes a temperature detection sticker 11, a camera 10, an A / D conversion unit 21, an image switching unit 22, and a digitization processing unit.
23, a brightness comparison / determination unit 26, a window creation unit 24, a reference data memory 25, an alarm circuit 27, a band compression unit 28, and a modem 29.

The temperature detecting seal 11 is, as shown in FIG.
It is provided in the equipment 14 to be monitored as a temperature detection part in the temperature monitoring area, and a camera (visible light CCD camera) 10 as an imaging camera is provided at a distance L from the temperature detection seal 11. As shown in FIG. 4A, the temperature detection seal 11 has a rectangular shape with one side length of 20 mm and 21.3 mm, and the temperature detection seal 11 has a circular temperature sensitive portion 12 having a diameter of 10 mm. And a temperature insensitive portion 13 around it.

In this embodiment, as shown in FIG. 4 (b), the semi-circular rescue transparent which allows the temperature sensitive portion 12 to be enlarged and visible by the lens effect on the surface side of the temperature sensitive portion 12. A lens body 8 is provided.

The temperature sensitive unit 12 functions as a temperature sensitive changer that changes the brightness after the temperature of the equipment 14 to be monitored reaches the brightness change temperature within the monitored temperature range. After reaching the brightness change temperature,
Due to the irreversible reaction due to thermal decomposition, the color changes from white to black. A thermolabel (product name) is known as a temperature-sensitive changeable body in which the brightness changes irreversibly according to the temperature, and such a temperature-sensitive changeable body is clear by thermal decomposition. A salt compound such as cobalt, nickel, iron, chromium, manganese, etc. which changes color is used as a thermochromic pigment. On the other hand, the temperature insensitive portion 13
Serves as a temperature insensitive region in which there is no brightness change corresponding to at least the temperature within the monitored temperature range.

The camera 10 is provided with a brightness detecting section (not shown) having a plurality of pixels, and the brightness detecting section compares the brightness of the temperature sensitive section 12 and the brightness of the temperature insensitive section 13. Each pixel is detected separately. In addition,
In this embodiment, as shown in FIG. 5A, the angle of view θ of the camera 10 is set to be about 26 degrees, and the brightness detection unit is set to about 25 degrees.
Divided into 10 million pixels, temperature sensitive part 12 and temperature insensitive part 13
It is designed to detect the brightness of.

As shown in FIG. 1, the detection signal of the brightness detection section of the camera 10 is added to the A / D conversion section 21, digitized by the A / D conversion section 21, and then passed through the video switching section 22. And added to the digitization processing unit 23.

The digitization processing section 23 processes the digitized signal of the brightness detection section added from the video switching section 22, and in the present embodiment, the digitization processing section 23 sets the window of the area set by the window creation section 24. Signal processing is performed based on the brightness detection signal from the temperature sensitive section 12 and the brightness detection signal from the temperature insensitive section 13. It should be noted that this window setting is set for all the areas detected by the brightness detecting section.

As shown in FIG. 2, the digitization processing unit 23 includes an average value calculation unit 30, a reference value determination unit 31, a threshold value determination unit 33, an illuminance determination unit 34, and a threshold value correction unit 35. There is.

The average value calculation unit 30 calculates the average value of the brightness of the region of the temperature sensitive unit 12 occupying a plurality of pixels based on the detection signal of the brightness detection unit added from the image switching unit 22 side. On the other hand, the average value of the brightness of the temperature insensitive section 13 occupying a plurality of pixels is calculated as the average value of the insensitive section brightness. For example, as shown in FIG.
The average luminance value α of the sensitive portion is obtained by dividing the total number of the respective luminances (the digitized values such as the numbers 7, 8 and 10 in the figure) of the plurality of pixels occupied by the temperature sensitive portion 12 by the number of pixels, Similarly, the average brightness β of the insensitive part is obtained by dividing the total number of the respective brightnesses (the digitized values such as the numbers 3 and 4 shown in the figure) of the plurality of pixels occupied by the temperature insensitive part 13 by the number of the pixels. Seek by. Then, the average value calculation unit 30 adds the values of the sensitive portion luminance average value α and the insensitive portion luminance average value β to the reference value determination unit 31 and the illuminance determination unit 34 moment by moment.

The reference value determining unit 31 determines a reference value for determination, which is obtained by a method given in advance, based on the average luminance value α of the sensitive section and the average luminance value β of the insensitive section. , The judgment reference value A is A = | α−
It is decided by the calculation of β |. The determined reference value A for determination is added to the brightness comparison determination unit 26.

The threshold value determining unit 33 determines a brightness threshold value that serves as a reference for determining the temperature abnormality of the temperature detection target portion.
In the present embodiment, the brightness threshold is an insensitive part brightness average value β,
Reference value A ₀ for determination before luminance change obtained by a method given in advance based on the average luminance value α ₀ of the sensitive portion before luminance change, average luminance value β of insensitive portion and average luminance value of sensitive portion after luminance change It is set to a value within the range between the post-luminance change determination reference value A ₁ obtained by a method given in advance based on α ₁ . Specifically, the reference value for determination before luminance change A ₀ is obtained as A ₀ = | α ₀ −β |
The reference value A ₁ for determination after brightness change is obtained by the formula A ₁ = | α ₁ −β |.

The values of A ₀ and A ₁ can be previously obtained by experiments using the temperature detecting seal 11, and the values can be given to the threshold value determining unit 33 in advance. In the embodiment, the values of A ₀ and A ₁ are not given in advance, and the following is performed based on the data given to the reference data memory 25 so that the brightness threshold value always corresponds to the illuminance of the temperature detected portion. The brightness threshold correction is determined.

The reference data memory 25 functions as a relational data storage unit. In the memory 25, the first of the illuminance of the temperature detected part and the insensitive part brightness average value β corresponding to this illuminance is stored.
Related data are given. The illuminance determination unit 34 uses the first relational data and the value of the average brightness value β of the insensitive section added from the average value calculation unit 30 to detect the temperature of the temperature detected by the camera 10 (monitored equipment 14 ) Of the illuminance, and the value of the obtained illuminance is added to the threshold correction unit 35.

In the reference data memory 25, in addition to the first relational data, for example, the distance L from the temperature detected portion to the camera 10 and the illuminance of the temperature detected portion as shown in FIG. The second relational data of the judgment reference value before and after the luminance change corresponding to the illuminance and the distance are given. In the present embodiment, the reference value for determination A ₀ before the brightness change
Since A ₀ = 0 regardless of the illuminance of the temperature detection part, the reference value A ₀ for determination before the luminance change is omitted in FIG. 6, and the reference value A ₁ for determination after the luminance change is omitted. Only shown. In addition, as the determination reference value A ₁ after the change in luminance,
In this embodiment, the 95% reliability range is obtained by statistical processing, and the result is shown in FIG.

As is clear from this figure, as the illuminance of the monitored equipment 14 as the temperature detection portion becomes higher, the judgment reference value A ₁ after the luminance change also becomes larger. In this embodiment,
Based on the illuminance characteristic of the judgment reference value A _{1 and} the value of the illuminance added from the illuminance determination unit 34, the threshold correction unit 35 obtains the judgment reference A ₁ after the brightness change,
For example, when the illuminance is 260 lux and the distance from the temperature-detected part to the camera 10 is 2 m, the reference value for determination A ₁ after the change in brightness is a value from about 54.4 to about 70. Then, from the value of the judgment reference value A ₁ after the brightness change, the threshold value determination unit 33 determines, for example, the brightness threshold value from the judgment reference value A ₀ before the brightness change (A ₀ = 0) for the judgment after the brightness change. Reference value A
A value within the range of ₁ (54.4 ≦ A ₁ ≦ 70.0) (for example,
53.0), and by such an operation, the brightness threshold value is set to a value corresponding to the illuminance of the temperature detected part and the distance from the monitored equipment 14 to the camera 10. Then, this brightness threshold value is used as the brightness comparison determination unit 26.
Is added to

Incidentally, in FIG. 6, the characteristic line when the distance L from the temperature detected part to the camera 10 is set to 1 m is
A big difference from the characteristic line when the distance L is set to 2 m and 3 m is that when the distance L is 1 m and the angle of view θ is 26 degrees, the distance L is too close and the temperature detection seal is Because the whole area of 11 cannot be detected by the camera 11. Then, widen the angle of view θ, etc.
If the entire area of the temperature detection sticker 11 can be detected by 10, the characteristic line when the distance L is 1 m is also 2 m and 3 m.
It is confirmed that the same tendency as the characteristic line in the case of is shown.

The brightness comparison / judgment unit 26 includes the reference value determination unit 31.
The reference value for determination added from, and the brightness threshold value set in the threshold value determination unit 33 are compared, and when the reference value for determination exceeds the brightness threshold value, it functions as an abnormality determination unit that outputs an abnormality determination signal. In this embodiment, when the judgment reference value exceeds the brightness threshold value, an abnormality judgment signal is added to the alarm circuit 27 and the video switching unit 22.

The alarm circuit 27 outputs an alarm in response to the abnormality determination signal applied from the brightness comparison / determination unit 26, and issues an alarm by an appropriate alarm means such as an abnormality display or a buzzer.

Further, an alarm output from the alarm circuit 27,
In the present embodiment, the abnormality determination signal output from the brightness comparison / determination unit 26 is adapted to be added to the band compression unit 28 via the video switching unit 22, and the band compression unit 28 allows, for example, a camera The image by 10 and the signal processing result thereof are compressed to an appropriate size and displayed, or are connected to the public line via the modem 29, and communication to the monitoring central station is performed.

The temperature monitoring device of this embodiment is constructed as described above. Next, a temperature monitoring method using this temperature monitoring device will be described. First, as shown in FIG. 3, the equipment to be monitored 14 as the temperature detected part in the temperature monitoring area is
By providing the temperature detection seal 11, the temperature sensitive part 12 and the temperature insensitive part 13 are separately arranged as shown in FIG. 4A, and the brightness and temperature insensitive part of these temperature sensitive parts 12 are arranged. 13
And the brightness of the image are detected by the camera 10 arranged at a distance L from the equipment 14 to be monitored.

Then, the brightness of the temperature sensitive part 12 and the brightness of the temperature insensitive part 13 are determined by the brightness detecting part of the camera 10.
The detection result is divided into a plurality of pixels, and the detection result is A
It is digitized by the / D conversion unit 21, and is added to the digitization processing unit 23 through the video switching unit 22.

Then, in the digitization processing unit 23, the average value calculation unit 30 shown in FIG. 2 determines the average value of the brightness of the temperature sensitive unit 12 occupying a plurality of pixels as described above.
Further, the average value of the luminance of the temperature insensitive portion 13 occupying the plurality of pixels is obtained as the insensitive portion luminance average value β. Then, based on the values of α and β,
By the reference value determination unit 31, the determination reference value A is A = | α−
It is obtained by the formula of β | and added to the brightness comparison and determination unit 26.

On the other hand, in the present embodiment, the brightness threshold value for performing the temperature abnormality determination is determined by the threshold value determining unit 33 based on the determination reference value before and after the brightness change. In determining the threshold value, first, the illuminance determining section 34 is determined based on the average brightness β of the insensitive section and the first relational data of the reference data memory 25.
The illuminance of the equipment 14 to be monitored is obtained by the above, and the reference value for determination before and after the change in luminance is determined based on the illuminance, the distance L from the equipment 14 to be monitored to the camera 10, and the second relational data in the reference data memory 25. It is calculated by the threshold correction unit 35. Then, based on this value, the threshold value determining unit 33 determines the brightness threshold value, and the brightness threshold value is added to the brightness comparison and determination unit 26.

Then, the brightness comparison / judgment unit 26 constantly judges whether or not the judgment reference value exceeds the brightness threshold value. When the judgment reference value exceeds the brightness threshold value, an abnormality judgment signal is output. An alarm is issued by the alarm circuit 27, and communication to the monitoring central station is performed via the band compression unit 28 and the modem 29.

According to the present embodiment, as described above, the temperature monitoring in the temperature monitoring region is performed by the temperature sensing unit 12 of the temperature detecting seal 11.
And since it is performed by detecting the brightness of the temperature insensitive section 13 by the camera 10, unlike the conventional temperature monitoring using a thermocouple sensor, the signal line does not congest in the temperature monitoring area, and There is no danger of electric discharge and the temperature detection seal 11 is provided at a desired location of the equipment 14 to be monitored so that the temperature can be monitored over a wide range.

The camera 10 is a CCD camera,
It is not expensive like an infrared camera, and if there is a certain amount of illuminance, the brightness of the temperature sensitive unit 12 and the temperature insensitive unit 13 is accurately detected, and the temperature sensitive unit 12 is processed by the signal processing of the digitization processing unit 23. Since it is possible to accurately grasp the change in the brightness of the equipment, the temperature of the equipment 14 to be monitored can be monitored reliably and at low cost.

Further, in this embodiment, when the temperature abnormality of the equipment 14 to be monitored is judged, the judgment reference value is set to the sensitive part brightness average value α and the insensitive part brightness average value β as described above. Based on the weather in the temperature monitoring area, the illuminance of the monitored equipment 14 is set according to the illuminance obtained based on the insensitive part luminance average value β. Even if the temperature is affected, it is possible to accurately determine the temperature abnormality without being affected by the illuminance.

Further, according to the above embodiment, the temperature sensitive section
Since the semi-spherical transparent lens body 8 is provided on the surface side of 12 and the temperature sensitive portion 12 is made to appear enlarged due to the lens effect of the transparent lens body 8, when detecting the brightness of the temperature sensitive portion 12. It is possible to improve the distance characteristics of
It is also possible to reduce the reflection of external light and to suppress the noise due to this, as compared with the case where the camera 10 directly detects the brightness of the flat temperature sensitive portion 12 without providing the transparent lens body 8.

FIG. 7 shows the essential structure of the second embodiment of the temperature monitoring device according to the present invention. As shown in the figure, in this embodiment, the brightness comparison / determination unit of the first embodiment is used.
The names of the respective constituent elements are the same as those in the first embodiment except that the color component comparison / judgment unit 36 is provided instead of 26, but the functions are different from those in the first embodiment. The characteristic of this embodiment is that the color component ratio of the temperature detection sticker 11 is changed to the camera 10
Is detected by the color component detection unit (not shown) of FIG. 1, and the temperature of the equipment 14 to be monitored as the temperature detected unit is monitored based on the detection result. Is configured.

The temperature detecting sticker 11 is divided into a temperature sensitive part 12 and a temperature insensitive part 13 like the temperature detecting sticker 11 of the first embodiment shown in FIG. 4A. In the present embodiment, the temperature sensitive unit 12 functions as a temperature sensitive changer that performs a color component ratio after the temperature of the equipment 14 to be monitored reaches the color component change temperature within the monitored temperature range. Further, the temperature insensitive section 13 functions as a temperature insensitive area where the color component ratio does not change corresponding to the temperature within the monitored temperature range.

The camera 10 has a distance L from the temperature detection seal 11.
The color component detection unit provided in the camera 10 allows the Y
By detecting the UV (luminance color difference) signal, the color component ratio of the temperature sensitive part 12 and the color component ratio of the temperature insensitive part 13 are
The detection is performed by a plurality of pixels. In addition,
Also in the present embodiment, this detection signal is digitized by the A / D conversion unit 21 and added to the digitization processing unit 23 via the video switching unit 22 as in the first embodiment.

The digitization processing unit 23 has components having the same names as the components of the digitization processing unit 23 in the first embodiment shown in FIG. It is configured to have a value determination unit 31, a threshold determination unit 33, an illuminance determination unit 34, and a threshold correction unit 35.

In the present embodiment, the average value calculating section 30 determines the average value of the color component ratios of the temperature sensitive section 12 occupying a plurality of pixels as the sensitive section color component average value based on the detection signal of the color component detecting section. On the other hand, the average value of the color component ratios of the temperature insensitive portion 13 occupying a plurality of pixels is obtained as the insensitive portion color component average value. In the present embodiment, YUV as a color component ratio is shown in FIG. 5 instead of the luminance in the first embodiment.
As shown in (b) of FIG. 4, the values are digitized and added to the average value calculation unit 30, and the average value calculation unit 30 calculates the luminance average in the first embodiment based on the digitized color component detection signals. In the same manner as the value calculation, the average value α _C of the insensitive part color components is obtained by dividing the total number of YUV of each pixel by the number of pixels, and the average insensitive part color component β _C is the total number of YUV of each pixel. Divide by and obtain. The sensitive part color component average value α _C and the insensitive part color component average value β _C obtained by the average value calculation part 30 are added to the reference determination part 31 and the illuminance determination part 34, respectively.

In this embodiment, the reference value determining unit 31 obtains a reference value for determination which is obtained by a method given in advance based on the average value α _C of the color components of the sensitive section and the average value β _{C of the} insensitive section color components. And the reference value for determination A _C is A _C = |
It is obtained from the expression of α _C −β _C | and added to the color component comparison and determination unit 36.

The threshold value determining unit 33 determines a color component ratio threshold value that serves as a reference for determining an abnormality in the temperature of the equipment 14 to be monitored. The threshold value determining unit 33 determines the color component average value β _{C of the} insensitive portion and the color component ratio before change. Based on the average value α _C0 of the insensitive part color component of the insensitive part color and the reference value A _C0 for determination before color component change obtained by a method (| α _C0 −β _C | in this embodiment) given in advance. Judgment after change of color component obtained by a method (| α _C1 −β _C | in this embodiment) given in advance based on the average component value β _C and the average color component value α _C1 of the sensitive part after the change of the color component ratio It is set to a value within the range between the reference value A _C1 for use.

In this embodiment, the reference data memory 25 (relational data storage unit) is provided with the first relational data between the illuminance of the temperature-detected portion and the insensitive portion color component average value β corresponding to this illuminance. Therefore, the illuminance determination unit 34 obtains the illuminance of the temperature-detected unit (monitoring target equipment 14) at the time of detecting the color component ratio from the first relational data and the insensitive portion color component average value β,
It is added to the threshold correction unit 35.

Further, the reference data memory 25 stores the distance L from the temperature detected part to the image pickup camera, the illuminance of the temperature detected part, and the reference values for judgment before and after the change of the color component ratio corresponding to these illuminance and distance. Of the second relational data, the threshold correction unit 35 is based on the second relational data, the illuminance added from the illuminance determining unit 34, and the distance L from the temperature detected unit to the camera 10. Then, the reference value for judgment before and after the change of the color component ratio is obtained to correct the color component ratio threshold value.

The method of obtaining the determination reference value before and after the change of the color component ratio by the threshold value correction unit 35 is the same as the method of obtaining the determination reference value before and after the change of the luminance in the first embodiment. Instead of the relational data of FIG. 6 used in the first embodiment, the vertical axis of FIG. 6 indicates the reference value A _C1 for determination after the change of the color component ratio or the reference value A for determination before and after the change of the color component ratio. The calculation is performed in the same manner as the calculation of the determination reference value before and after the luminance change in the first embodiment based on the relational data of _C1 and A _C0 . Then, the color component ratio threshold value corrected and determined by the threshold value correction unit 35 and the threshold value determination unit 33 is added to the color component comparison determination unit 36.

The color component comparison / judgment unit 36 compares the judgment reference value added from the reference determination unit 31 with the color component ratio threshold value,
When the judgment reference value exceeds the color component ratio threshold, it functions as an abnormality judgment unit that outputs an abnormality judgment signal. When the judgment reference value A _C exceeds the color component ratio threshold, an alarm judgment signal is issued. It is added to the circuit 27 and the video switching unit 22.

Alarm circuit 27, band compression unit 28, modem 29
Has the same function as that of the first embodiment, the description thereof will be omitted.

This embodiment is constructed as described above,
In this embodiment, the temperature sensing unit 12 in the first embodiment is used.
And the brightness of the temperature insensitive section 13 is detected, and when the judgment reference value obtained from the average brightness value α of the insensitive section and the average brightness value β of the insensitive section exceeds the brightness threshold value, the abnormality determination is performed. Similarly, the color component ratios of the temperature-sensitive portion 12 and the temperature-insensitive portion 13 are divided into a plurality of pixels by the camera 10 and detected, and the average value α of the sensitive portion color components obtained from the detection signal is detected.
_C and the insensitive part color component average value β _C is used to obtain a judgment reference value, and when this judgment reference value exceeds the color component ratio threshold value determined by the threshold value determination portion 33, the abnormality of the monitored equipment 14 is detected. A determination is made and a safe operation corresponding to this abnormality determination is performed.

As described above, according to the present embodiment, the temperature abnormality determination operation using the YUV detection signal is performed instead of the temperature monitoring using the brightness detection signal in the first embodiment. The same effects as those of the first embodiment can be obtained.

The present invention is not limited to the above-mentioned embodiment, and various embodiments can be adopted. For example, in the above-mentioned embodiment, the temperature-sensitive part 12 of the temperature detection seal 11 uses an irreversible thermolabel which uses a salt compound such as cobalt or nickel as a thermochromic pigment, but the temperature-sensitive part 12 is, for example, an inorganic mercury metal complex salt. It may be formed by a temperature-sensitive changeable body such as a thermotape (product name) that carries out a reversible reaction, which is a color change accompanied by the transition of the crystal structure depending on the temperature.

The shape, size, and arrangement of the temperature sensitive section 12 and the temperature insensitive section 13 are not particularly limited.
For example, as shown in FIG. 8A, a temperature insensitive portion 13 may be provided on the outer peripheral side of the rectangular temperature sensitive portion 12, and as shown in FIG. The parts 12 are arranged at intervals, and the temperature insensitive part is provided on the outer peripheral side of the temperature sensitive part 12.
13 may be provided.

As shown in FIG. 8B, when a plurality of temperature sensitive parts 12 are provided, the temperature of the temperature change of each of the temperature sensitive parts 12 is changed so that the temperature of change of brightness and the temperature of change of the color component are different. By detecting the brightness and color component ratio for each 12, it becomes possible to finely detect the temperature of the temperature-detected part, and by using the temperature measured in detail, for example, perform a safe operation stepwise. You can also

Further, in each of the above embodiments, the temperature detecting seal having the temperature sensitive portion 12 and the temperature insensitive portion 13 is used.
11 is arranged in the equipment to be monitored 14 to monitor the temperature, but instead of providing the temperature detection seal 11, for example, thermo paint (product name) or the like is attached to the equipment to be monitored 14 as the temperature detection part. By coating, the temperature-sensitive changing body may be provided in the monitored facility 14, and the temperature of the monitored facility 14 may be used as a temperature insensitive region to monitor the temperature in the same manner as in the above embodiment. As described above, the temperature monitoring device of the present invention prepares only the temperature-sensitive change body among the temperature-sensitive change body and the temperature-insensitive area, and the temperature-insensitive area uses the brightness and the color component ratio of the equipment to be monitored. A temperature monitoring operation can be performed.

Further, in the above-mentioned embodiment, when the determination reference value is obtained, the average luminance value of the sensitive portion-the average luminance value of the insensitive portion (| α-β |) or the average value of the color component of the sensitive portion-insensitive portion. It was obtained by calculating the partial color component average value (| α _C −β _C |), but the method for obtaining the reference value for determination is not particularly limited, and the average luminance value of the sensitive area and the average luminance value of the insensitive area can be calculated. Ratio of (α
/ Β or β / α), or the average value of the color components of the sensitive part and the average value of the color components of the insensitive part (α _C / β _C or β _C / α _C ).

Further, in the above embodiment, the reference data memory 25 is provided with the graph data as shown in FIG. 6 as the second relational data, but the second relational data and the first relational data given to the reference data memory 25 are given. The relational data of 1 is not necessarily graph data, and may be given by table data, arithmetic expression, or the like.

Further, in the above embodiment, the illuminance determining section 34 and the threshold correcting section 35 are provided, the illuminance determining section 34 obtains the illuminance at the time of luminance detection and the color component ratio detection, and the luminance threshold and Although the color component ratio threshold value is corrected and determined, the illuminance determination unit 34 and the threshold value correction unit 35 are omitted, and for example, the operator of the temperature monitoring device performs an operation to obtain the illuminance or an operation to correct the threshold value. Good.

Further, in the above embodiment, the threshold value determining unit 33 is provided to determine the brightness threshold value and the color component ratio threshold value. However, the threshold value determining unit 33 is omitted, and the operator of the temperature monitoring device can The threshold may be determined each time, or the threshold may be set in advance and stored in a memory or the like.

Further, in the above-mentioned embodiment, the semi-spherical transparent lens body 8 is provided in the temperature sensitive portion 12, but the transparent lens body 8
May be formed in a shape other than a hemispherical shape, for example, in a spherical shape, and the transparent lens body 8 may be one which can be made to appear as a temperature sensitive change member 12 which is a temperature sensitive change body by its lens effect. Good. Further, the transparent lens body 8 can be omitted. However, if the transparent lens body 8 is provided so that the temperature-sensitive change body can be seen in an enlarged manner, reflection of external light can be softened, noise can be reduced, and distance characteristics can be improved. It is preferable to provide the lens body 8 on the surface side of the temperature-sensitive change body.

Further, in the above embodiment, the window area set by the window creating section 24 is the temperature sensing section 12
Although the entire area of the temperature insensitive section 13 is used, the window creation section 24 may set windows in some areas of the temperature insensitive section 12 and the temperature insensitive section 13 to perform signal processing.

Further, in the second embodiment, the camera 10
The color component ratio detected by
Instead of, the RGB (Red Green Blue) signal may be detected as the color component ratio.

[0078]

According to the present invention, a temperature sensitive change body is provided in a desired temperature detection area in the temperature monitoring area, and the luminance or color component ratio of the temperature sensitive change body and the temperature sensitive change body are distinguished from each other. The brightness or color component ratio of the temperature-insensitive area is detected by the imaging camera, and the judgment obtained based on this detection signal is output as an abnormality judgment signal when the reference value exceeds the brightness threshold, or as a judgment reference. Since the abnormality determination signal is output when the value exceeds the color component ratio threshold value, it is possible to measure the temperature of a plurality of temperature detection target parts with one imaging camera, for example. Therefore, it is possible to monitor the temperature of the temperature-detected portion without taking up space and without complicating the terminal processing due to the congestion of the signal line and the risk of discharge.

Further, since the image pickup camera can be constituted by a CCD camera or the like, the cost does not increase unlike the conventional temperature monitoring device using an infrared camera, and the details of the temperature monitoring area can be observed. The temperature can be measured, and the temperature in a desired temperature monitoring region can be easily monitored at low cost.

Further, when setting the brightness threshold value or the color component ratio threshold value for making the temperature abnormality determination, if the determination is made based on the brightness average value or the color component ratio average value of the temperature insensitive part, Even if the illuminance of the temperature monitoring area changes due to the weather, etc., by changing the brightness threshold and the color component ratio threshold according to the change, there is no effect of the illuminance of the temperature monitoring area, etc. The temperature abnormality can be accurately determined.

Furthermore, if a semi-spherical or semi-cylindrical transparent lens body is provided on the surface side of the temperature-sensitive change body constituting the temperature monitoring device so that the temperature-sensitive change body can be magnified and viewed by the lens effect. In addition, it is possible to improve the distance characteristic when detecting the brightness and the color component ratio of the temperature-sensitive change body, soften the reflection to the outside light, and suppress the noise.

As described above, according to the present invention, the information such as the abnormal temperature rise in the temperature monitoring area can be accurately notified to the monitor based on the output abnormality determination signal. Even if the person does not constantly monitor, it is possible to prompt an appropriate countermeasure in the event of an abnormality such as a temperature rise. Also, if the image of the image pickup camera can be checked by the observer when this abnormality determination signal is output, it becomes possible to inform the observer of the temperature information in the temperature monitoring area in a more detailed manner. It also becomes possible to promptly deal with the problem more accurately. Then, if the monitoring person visits the temperature monitoring area based on the accurate temperature information to deal with the abnormality, the safety of the worker can be secured.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a main configuration of a control section of a first embodiment of a temperature monitoring device according to the present invention.

FIG. 2 is a block diagram showing a configuration of a digitization processing unit 23 of the above embodiment.

FIG. 3 is an explanatory diagram of an arrangement state of a monitoring target facility and a camera in the embodiment of the temperature monitoring device according to the present invention.

FIG. 4 is an explanatory view of a temperature detection sticker provided in a temperature monitoring device according to the present invention and an arrangement state and a function of a transparent lens body.

FIG. 5 is an explanatory diagram showing a process of a signal detecting and processing operation in the above embodiment.

FIG. 6 is provided in the reference data memory of the above embodiment,
It is the relational data of the illuminance of the temperature detected portion, the distance from the temperature detected portion to the camera, and the determination reference value after the change in luminance.

FIG. 7 is a block diagram showing a main part configuration of a second embodiment of the temperature monitoring device according to the present invention.

FIG. 8 is an explanatory diagram showing an example of a temperature detection seal provided in another embodiment of the temperature monitoring device according to the present invention.

FIG. 9 is an explanatory diagram showing an example of a conventional temperature monitoring method.

[Explanation of symbols]

 8 Transparent lens body 10 Camera 11 Temperature detection sticker 12 Temperature sensitive part 13 Temperature insensitive part 23 Digitization processing part 25 Reference data memory 26 Luminance comparison judgment part 30 Average value calculation part 31 Reference value determination part 33 Threshold value determination part 34 Illuminance determination Part 35 Threshold correction part 36 Color component comparison judgment part

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Yoshihisa Katsuyama 2-6-1 Marunouchi, Chiyoda-ku, Tokyo Furukawa Electric Co., Ltd.

Claims (13)

[Claims] 1. A temperature-sensitive change body, which is provided in a temperature-detected portion of a temperature monitoring region, and which changes the brightness after the temperature of the temperature-detected portion reaches a brightness change temperature within a monitored temperature range. , The brightness of the temperature-sensitive change member and the brightness of a temperature-insensitive region which is separated from the temperature-sensitive change member and has no brightness change corresponding to at least the temperature within the monitoring temperature range are detected by the imaging camera. A brightness detection unit having a plurality of pixels, and based on a detection signal of the brightness detection unit, obtain an average value of the brightness of the region of the temperature-sensitive change body occupying the plurality of pixels as a sensitivity unit brightness average value, On the other hand, based on the average value calculation unit that obtains the average value of the luminance of the temperature insensitive area occupying the plurality of pixels as the insensitive portion luminance average value, and the insensitive portion luminance average value and the insensitive portion luminance average value. Requested by a given method A reference value determining unit for obtaining a reference value for determination, and an abnormality determining unit for comparing the reference value for determination with a luminance threshold value to be set and outputting an abnormality determination signal when the reference value for determination exceeds the luminance threshold value. A temperature monitoring device comprising: 2. A reference value for determination before brightness change and a brightness average value of the insensitive section, which are obtained by a method given in advance based on the brightness threshold value based on the average value of the insensitive section brightness and the average value of the sensitive section brightness before the brightness change. And a sensitivity determining unit brightness average value after the brightness change, a threshold value determining unit for setting the value within a range between the brightness change determination reference value obtained by a method given in advance is provided. The temperature monitoring device according to claim 1. 3. The first relationship data between the illuminance of the temperature detected part and the average brightness value of the insensitive part corresponding to the illuminance, the distance from the temperature detected part to the imaging camera, the illuminance of the temperature detected part, and these. Relational data storage unit to which second relational data of the reference value for judgment before and after the luminance change corresponding to the illuminance and the distance are given; and an insensitive portion luminance average value obtained based on the detection signal of the luminance detection unit. An illuminance determining unit that obtains the illuminance of the temperature detected unit at the time of brightness detection from the first relationship data; the illuminance obtained by the illuminance determining unit and the distance from the temperature detected unit to the imaging camera, and the second relationship The facility monitoring apparatus according to claim 2, further comprising: a threshold correction unit that determines a reference value for determination before and after a change in brightness based on the data and corrects the brightness threshold. 4. A temperature-sensitive change body, which is provided in a temperature-detected portion in a temperature monitoring region and changes a color component ratio after the temperature of the temperature-detected portion reaches a color component change temperature within a monitored temperature range. The color component ratio of the temperature-sensitive change body and the color of the temperature-insensitive region which is divided from the temperature-sensitive change body and has no change in the color component ratio corresponding to at least the temperature within the monitoring temperature range. A color component detection unit having a plurality of pixels for detecting a component ratio by an imaging camera, and a color component ratio of the region of the temperature-sensitive change body occupying the plurality of pixels based on a detection signal of the color component detection unit An average value of the insensitive part color component average value, meanwhile, an average value calculation part for obtaining an average value of the color component ratios of the temperature insensitive regions in the plurality of pixels as an insensitive part color component average value, Sensitive area color component average and insensitive area color formation A reference value determination unit that obtains a determination reference value that is obtained by a method that is given in advance based on the divided average value, and compares the determination reference value with a color component ratio threshold that is set, and the determination reference value is the color component. A temperature monitoring device, comprising: an abnormality determination unit that outputs an abnormality determination signal when the ratio threshold is exceeded. 5. A color component ratio threshold value is used as a reference value for determination before color component change, which is obtained by a method given in advance based on the average value of insensitive part color components and the average value of insensitive part color components before change of color component ratio. , Set to a value within the range between the reference value for post-color component change determination, which is obtained by a method given in advance based on the average value of the insensitive part color components and the average value of the insensitive part color components after the change of the color component ratio The temperature monitoring device according to claim 4, further comprising a threshold value determining unit. 6. The first relationship data between the illuminance of the temperature detected part and the average value of the color components of the insensitive part corresponding to the illuminance, the distance from the temperature detected part to the imaging camera, and the illuminance of the temperature detected part. A relational data storage unit provided with second relational data of the judgment reference value before and after the change of the color component ratio corresponding to these illuminance and distance; and an insensitive unit obtained based on the detection signal of the color component detection unit. An illuminance determining unit that obtains the illuminance of the temperature detected unit at the time of detecting the color component ratio from the color component average value and the first relational data; and the illuminance obtained by the illuminance determining unit and the temperature detected unit to the imaging camera. 6. A threshold correction unit that corrects the color component ratio threshold by obtaining a determination reference value before and after a color component ratio change based on the distance and the second relational data. Equipment monitoring equipment. 7. A semi-spherical or semi-cylindrical transparent lens body is provided on the surface side of the temperature-sensitive change body so that the temperature-sensitive change body can be magnified and viewed by a lens effect. The temperature monitoring device according to any one of claims 1 to 6. 8. A temperature sensitive change body for performing a brightness change after a temperature of the temperature detected part reaches a brightness change temperature within a monitored temperature range, and at least the monitored temperature in the temperature detected part of the temperature monitoring region. The temperature-insensitive area that does not change in brightness corresponding to the temperature within the range is arranged in a divided manner, and the brightness of these temperature-sensitive change body and temperature-insensitive area is detected by dividing it into multiple pixels using an imaging camera. However, after that, the average value of the luminance of the region of the temperature-sensitive change body occupying the plurality of pixels is obtained as the average value of the sensitive portion luminance, while the average of the luminance of the temperature-insensitive region occupying the plurality of pixels is obtained. The value is obtained as an insensitive part luminance average value, and thereafter, a determination reference value is obtained by a method given in advance based on the insensitive part luminance average value and the insensitive part luminance average value, and the determination reference value is calculated. Compared with the set brightness threshold A temperature monitoring method, wherein an abnormality determination signal is output when the determination reference value exceeds a brightness threshold value. 9. A brightness threshold value, which is a reference value for determination before brightness change, obtained by a method given in advance based on an average brightness value of the insensitive section and an average brightness value of the sensitive section before brightness change, and an average brightness of the insensitive section. 9. The value within the range between the post-luminance change determination reference value obtained by a method given in advance based on the value and the sensitive section luminance average value after the luminance change. Temperature monitoring method. 10. The illuminance of the temperature detected part at the time of brightness detection is calculated from the first relationship data between the illuminance of the temperature detected part and the average brightness value of the insensitive part corresponding to the illuminance and the average brightness value of the insensitive part. Then, the obtained illuminance, the distance information from the temperature-detected part to the imaging camera, the distance from the temperature-detected part to the imaging camera, the illuminance of the temperature-detected part, and these illuminances and distances were determined. 10. The equipment monitoring method according to claim 9, wherein the brightness threshold value is corrected by obtaining the determination reference value before and after the brightness change based on the second relational data of the determination reference value before and after the brightness change. 11. A temperature-sensitive change body that changes a color component ratio after the temperature of the temperature detection part reaches a color component change temperature within a monitoring temperature range in a temperature detection part of the temperature monitoring region, and A temperature insensitive area where the color component ratio does not change corresponding to the temperature within the monitored temperature range is divided and arranged, and a plurality of color component ratios of the temperature sensitive change body and the temperature insensitive area are obtained using an imaging camera. Of the temperature-sensitive change body occupying the plurality of pixels, the average value of the color component ratios of the regions of the temperature-sensitive change body is obtained as an average value of the color components of the sensitive portion, while the plurality of pixels are The average value of the color component proportions of the temperature insensitive area occupied is determined as an insensitive portion color component average value, and then given in advance based on the insensitive portion color component average value and the insensitive portion color component average value. A reference value for determination is obtained by a method, and Temperature monitoring method and outputting an abnormality determination signal when determining the reference value as compared to the color component ratio threshold value set to a constant reference value exceeds the color component ratio threshold. 12. The color component ratio threshold value is a reference value for determination before color component change, which is obtained by a method given in advance based on the insensitive part color component average value and the insensitive part color component average value before the color component ratio change. And a reference value for determination after color component change obtained by a method given in advance based on the average value of insensitive part color components and the average value of insensitive part color components after the change of the color component ratio. 12. The temperature monitoring method according to claim 11, wherein: 13. A temperature detected at the time of detecting a color component ratio from first relationship data between the illuminance of the temperature detected part and the average value of the insensitive part color components corresponding to the illuminance and the average value of the insensitive part color components. After obtaining the illuminance of the temperature sensor, the obtained illuminance, the distance information from the temperature detection target to the imaging camera, the distance information from the temperature detection target to the imaging camera, and the illuminance of the temperature detection target It is characterized in that the color component ratio threshold value is corrected by obtaining the determination reference value before and after the color component ratio change based on the second relational data of the determination reference value before and after the color component ratio change corresponding to the illuminance and the distance. 13. The equipment monitoring method according to claim 12.