JP2008157559A - High temperature furnace wall image pick-up device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high temperature furnace wall image pick-up device providing continuous observation of a furnace wall emitting radiation light due to a high temperature in the furnace, through an observation window from a furnace exterior, and providing discrimination of irregularity and cracks by acquiring a furnace wall image having contrast. <P>SOLUTION: The high temperature furnace wall image pick-up device 10 is installed on an outer side of the observation window 2 for remotely carrying out image pick-up the furnace wall 1 emitting radiation light due to a high temperature in the furnace. It is provided with a pulse laser device 12 irradiating an observation portion (a small enough part) of the furnace wall with a pulse laser 4 stronger than the radiation light 3 and having an angle of divergence the same as a minimum angle of visibility, an image pick-up device 14 remotely carrying out image pick-up of an irradiation portion of the pulse laser 14 by the minimum angle of visibility, and a high speed shutter 16 positioned between the image pick-up device and the furnace wall and opening in synchronization with the irradiation time of the pulse laser 4. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a high-temperature furnace wall imaging apparatus that images a furnace wall in which the temperature in the furnace is high and the furnace wall emits radiation.

  A hot blast furnace for supplying hot blast to an iron blast furnace has a height of about 50 m above the ground and an inner diameter of 10 m or more, and the inner wall temperature reaches about 1600 ° C. during operation and about 1400 ° C. during rest.

Such a hot stove is continuously used for a long period (for example, about 20 years) and takes a long period of time (for example, about 3 years) because of a large facility. Therefore, if even one unit cannot be used, there is a risk of causing a long-term blast furnace reduction operation. For this reason, for hot-blast furnaces that have been used for a long period of time, as a part of in-furnace diagnosis, damage status of refractories in the furnace has been observed during the rest period.
However, since the observation inside the hot blast furnace is performed within a limited time such as when the blast furnace is closed, the temperature inside the furnace is high and the environment is harsh because the image is taken in the high temperature furnace.

  Patent Documents 1 and 2 have already been proposed as means for observing a high-temperature furnace wall such as a hot stove in such a harsh environment.

  The “hot blast furnace inside observation apparatus” of Patent Document 1 aims at observing the damage state of the refractory inside the furnace in the hot stove for iron making under the condition close to the marriage state, as shown in FIG. A photomultiplier tube 51 is provided in front of the image pickup tube or image pickup device 50, and a remotely operable zoom device 53 having a lens having a transmittance suitable for the spectral sensitivity is attached in front of the photomultiplier tube 51. The entire imaging apparatus is built in a cooling box 56 having a window glass 55 that reflects infrared rays having a wavelength of 2 μm or more.

  The “furnace wall observation device” of Patent Document 2 is intended to detect only open cracks in which carbon deposits do not enter, and as shown in FIG. Irradiate and observe the furnace wall formed by the reflected light with the imaging device 62. In addition, since the self-luminous light emitted from the high temperature furnace wall has a spectrum distribution biased to the red side, the light that irradiates the furnace wall surface is blue light, and a filter that transmits only the blue side when imaging with an imaging device Thus, the information of the reflected light is preferentially imaged while suppressing the influence of the self-light emission.

Japanese Patent Application Laid-Open No. 5-34080, “Hot Furnace Furnace Observation Device” JP 2005-146164 A, “Furnace wall observation device”

  When the inside of the furnace is at a high temperature (for example, about 1400 ° C.) and the furnace wall emits light by radiant light as in the hot air furnace described above, the furnace wall can be visually observed through the peephole for a short time. However, in the apparatus of Patent Document 1, when the furnace temperature is uniform and the furnace wall material (for example, refractory bricks) is the same, radiation with the same intensity and the same wavelength is emitted from any position. Even if there are irregularities and cracks on the wall, there is a problem that only an image with no contrast can be obtained.

Further, in the apparatus of Patent Document 2, since the wall surface is irradiated with blue light and the reflected light is imaged through a filter that transmits only the blue side, a contrast image can be obtained in a dark furnace. In the furnace, the brightness of the radiant light was excellent, and only images without contrast were obtained.
Furthermore, since the illumination range of the illumination device and the imaging range of the imaging device are wide (for example, the solid angle is around 30 degrees), the radiant heat incident from the high-temperature furnace wall through the observation window is excessive, and the observation time is extremely limited ( (For example, within 5 minutes).

  The present invention has been developed to solve the above-described problems. That is, the object of the present invention is to enable continuous observation of the furnace wall from the outside of the furnace through the observation window, and to obtain a contrasting furnace wall image. An object of the present invention is to provide a high-temperature furnace wall imaging device capable of discriminating irregularities and cracks in the furnace wall.

According to the present invention, there is provided a high-temperature furnace wall imaging device installed outside the observation window in order to remotely image the furnace wall in which the temperature inside the furnace is high and the furnace wall emits radiation.
A pulse laser device that irradiates the observation part of the furnace wall with a pulsed laser beam that is stronger than the radiation light and has a spread angle equivalent to the minimum required viewing angle;
An imaging device that remotely images the irradiated portion of the pulsed laser light from the minimum necessary viewing angle;
A high-temperature furnace wall imaging device is provided, comprising a high-speed shutter positioned between the imaging device and the furnace wall and opened in synchronization with the irradiation time of the pulsed laser light.

  According to a preferred embodiment of the present invention, the optical axes of the pulse laser device and the imaging device are parallel to each other or intersect in the vicinity of the furnace wall position.

Also, a heat shield plate installed outside the observation window and having an irradiation hole with a size that allows only the pulsed laser light to pass through, and an imaging hole with a size that allows only the irradiation portion to be imaged,
An optical filter that blocks between the imaging hole and the imaging apparatus and allows only the wavelength of the pulsed laser beam to pass through.

  Moreover, it is preferable to further include a heat-resistant shutter that opens the irradiation hole and the imaging hole in synchronization with the irradiation time of the pulse laser beam.

  In addition, an imaging scanning device is provided that moves an irradiation portion of the pulse laser beam by the pulse laser device and an imaging position by the imaging device along an observation portion of the furnace wall.

A storage device for storing a plurality of images taken by the imaging device;
And an image processing apparatus that bonds a plurality of photographed images along the observation portion of the furnace wall.

According to the configuration of the present invention described above, a pulse laser beam that is stronger than the radiation from the furnace wall and has a spread angle equivalent to the minimum required viewing angle is irradiated toward the observation part of the furnace wall. Since the image is taken remotely from the camera with the minimum required viewing angle, the shadow of the furnace wall is formed by strong pulsed laser light, and a contrasting furnace wall image is obtained to obtain the unevenness and crack of the furnace wall. Can be determined.
In addition, since the pulsed laser beam with a spread angle equivalent to the minimum required viewing angle is irradiated toward the observation part of the furnace wall, there is little radiation light entering the exit from the irradiation part of the furnace wall, and the pulse laser device Can be easily maintained in a safe temperature range.
Further, since the irradiated portion is photographed from the remote at the minimum necessary viewing angle, there is little radiation light incident on the photographing device from the irradiated portion of the furnace wall, and the photographing device can be easily maintained in a safe temperature range.
In addition, a high-speed shutter is located between the imaging device and the furnace wall and opens in synchronization with the irradiation time of the pulse laser beam, so that radiation light incident on the imaging device from the irradiated part of the furnace wall (partially small part) can be accelerated. It is possible to limit to a short time when the shutter is opened, and it is possible to easily maintain the photographing apparatus in a safe temperature range.

Further, a heat shield plate having an irradiation hole having a size (for example, about 1 mm in diameter) through which only the pulse laser beam can pass and an imaging hole (for example, having a diameter of about 10 to 20 mm) in which only the irradiated portion can be imaged. By providing, the incidence of radiant light from the furnace wall can be suppressed only to the irradiation hole and the imaging hole.
Furthermore, by providing an optical filter that cuts off between the imaging hole and the imaging device and allows only the wavelength of the pulsed laser light to pass, it is possible to limit the incidence of radiation light from the relatively large imaging hole only to the wavelength of the pulsed laser light. it can.
Therefore, with this configuration, it is possible to continuously observe from the outside of the furnace wall through the observation window the furnace wall in which the temperature inside the furnace is high and the furnace wall emits radiation.

  Furthermore, by providing a heat-resistant shutter that opens the irradiation hole and the imaging hole in synchronization with the irradiation time of the pulse laser beam, radiation light incident on the exit port of the pulse laser device and the high-speed shutter of the imaging device is reduced, and these overheatings are reduced. Can be prevented.

  In addition, by providing an imaging scanning device that moves the irradiation part of the pulse laser beam by the pulse laser device and the imaging position by the imaging device along the observation part of the furnace wall, it prevents a wide range of incident radiation while preventing a wide range of radiation. The observation part can be photographed.

  Furthermore, by providing a storage device that stores a plurality of captured images and an image processing device that combines the plurality of captured images, a wide range of observation parts are displayed as continuous images, and the unevenness and cracks of the furnace wall can be discriminated. Can be easily.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In each figure, common portions are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 1 is an overall configuration diagram of a high-temperature furnace wall imaging apparatus according to the present invention. As shown in this figure, the high-temperature furnace wall imaging device 10 of the present invention is installed outside the observation window 2 in order to image the furnace wall 1 in which the inside of the furnace is hot and the furnace wall emits radiation light. The

The furnace wall 1 that emits light by radiation is a furnace wall of a hot blast furnace for a blast furnace in an embodiment to be described later, and is heated to a high temperature of about 1400 ° C. when the wind is off. In this case, the radiation light 3 from the furnace wall 1 is light having a light emission peak at a wavelength of 2 to 3 μm in the infrared region. Further, visible light having a long wavelength is also included, and the light is emitted in red in the visible light region.
In addition, this invention is not limited to the furnace wall of the hot blast furnace for blast furnaces, It can apply also to the furnace which has the furnace wall heated to about 1000 degreeC or more high temperature, for example, a coke oven, a converter, etc.

  In FIG. The high-temperature furnace wall imaging device 10 of the present invention includes a pulse laser device 12, an imaging device 14, a high-speed shutter 16, and an imaging control device 18.

The pulse laser device 12 irradiates the observation portion of the furnace wall 1 with pulsed laser light 4 that is stronger than the radiation light 3 emitted from the furnace wall 1 and has a spread angle equivalent to the minimum viewing angle. This divergence angle is set to be sufficiently small so that the irradiated portion is sufficiently small (about 50 cm in diameter at the furnace wall position) at the furnace wall position at a distant position (for example, about 8 m).
In this example, the pulse laser device 12 includes a pulse laser oscillator 12a, a power supply device 12b, and an irradiation optical system 12c. The pulse laser oscillator 12a is, for example, an Nd: YAG laser, and uses 1.06 μm or 0.53 μm (second harmonic). In addition, this invention is not limited to a Nd: YAG laser, It is good that it is a wavelength sufficiently distant from the peak wavelength 2-3 micrometers of the radiant light 3, Preferably it is a visible region (0.38-0.77 micrometer).

In this example, the pulse laser oscillator 12a and the irradiation optical system 12c are connected by an optical fiber 12d, the pulse laser light 4 is guided from the pulse laser oscillator 12a to the irradiation optical system 12c, and the pulse laser oscillator 12a The irradiation optical system 12c is movable.
The present invention is not limited to this configuration, and the optical fiber 12d may be omitted and the pulse laser oscillator 12a and the irradiation optical system 12c may be directly connected.

In this example, the irradiation optical system 12c is a confocal lens, and the ultrafine (for example, about 1 mm in diameter) pulsed laser light 4 oscillated by the pulsed laser oscillator 12a is separated from the furnace wall at a remote position (for example, about 8 m). It is set to illuminate a sufficiently small part with a diameter of about 50 cm.
Note that the irradiation optical system 12c may be omitted when the spread angle is sufficiently small due to the straightness of the laser light.

The imaging device 14 images the irradiated portion of the pulsed laser light 4 remotely from the minimum necessary viewing angle. The viewing angle is set to a size that includes the irradiated portion of the pulsed laser light 4 and does not include other portions as much as possible.
In this example, the photographing device 14 includes a CCD camera 14a and a telephoto lens 14b, and a sufficiently small part having a diameter of about 50 cm is photographed by the CCD camera 14a through the telephoto lens 14b at a furnace wall position at a distant position (for example, about 8 m). It is supposed to be.

The optical axes of the pulse laser device 12 and the imaging device 14 are easier to adjust if they are parallel, but if they are tilted so that they intersect in the vicinity of the furnace wall position, the shadow becomes larger and the contrast may be improved. .
With this configuration, the irradiated portion irradiated with the pulse laser device 12 can be reliably imaged with the imaging device 14, and the ratio of the furnace wall portion other than the irradiation included in the same image can be kept small.

The high-speed shutter 16 is located between the imaging device 14 and the furnace wall and opens in synchronization with the irradiation time of the pulsed laser light 4.
In this example, the high-speed shutter 16 is an electronic shutter positioned between the CCD camera 14a and the telephoto lens 14b. The shutter speed of the high-speed shutter 16 is, for example, an opening time of 0.1 to 1 msec (1/1000 to 1/10000 seconds), and is opened in synchronization with the irradiation time of the pulse laser beam 4. The background light can be removed most when the opening time of the electronic shutter is the same as the pulse width of the laser.
The high-speed shutter 16 may be integrated with the CCD camera 14a or may be built in the CCD camera 14a. The high-speed shutter 16 may be a digital shutter that digitally cuts out an image.

In this example, the imaging control device 18 includes a sync controller 18a and a computer 18b (PC).
The sync controller 18a controls the pulse laser device 12 and the high-speed shutter 16 in response to a command from the computer 18b, and synchronizes the irradiation of the pulse laser beam 4 and the operation of the high-speed shutter 16.
The computer 18b outputs a command signal to the sync controller 18a and receives a captured image from the CCD camera 14a.
The computer 18b includes a storage device and an image processing device. The storage device stores a plurality of images captured by the imaging device. The image processing apparatus has a function of bonding a plurality of captured images along the observation portion of the furnace wall.

In FIG. 1, the high-temperature furnace wall imaging device 10 of the present invention further includes optical filters 20 and 21. The optical filters 20 and 21 are, for example, interference filters, which pass only the wavelength of the pulsed laser light and cut other wavelengths.
In this example, the optical filter 20 is located between the irradiation optical system 12c and the furnace wall 1, and cuts most of the radiation light 3 from the furnace wall 1 (other than the wavelength of the pulsed laser light).
The optical filter 21 is located between the telephoto lens 14b and the furnace wall 1, and similarly cuts most of the radiation light 3 from the furnace wall 1 (other than the wavelength of the pulsed laser light).

The high-temperature furnace wall imaging device 10 of the present invention further includes a heat shielding plate 22 and a heat-resistant shutter 24.
The heat shielding plate 22 is a heat insulating plate having high heat insulating performance, and is installed outside the observation window 2. The heat shielding plate 22 has an irradiation hole 22a having a size that allows only the pulsed laser light 4 to pass therethrough and an imaging hole 22b having a size that allows only the irradiated portion of the furnace wall 1 to be imaged. The size of the irradiation hole 22a is, for example, about 1 to 3 mm in diameter. Further, the size of the imaging hole 22b is, for example, about 10 to 30 mm in diameter.

The optical filter 20 described above may be omitted when the size of the irradiation hole 22a is small and the influence of the radiation light 3 entering from the hole is small.
Further, the above-described optical filter 21 is preferably larger than the photographing hole 22b of the heat shielding plate 22 and located at a position where the gap between the photographing hole 22b and the photographing device 14 is blocked.

In this example, the heat-resistant shutter 24 is a heat-resistant disk 25 that is rotated at a high speed by a motor 24a. The heat-resistant disk 25 has an irradiation hole 25a and a photographing hole provided at positions corresponding to the irradiation hole 22a and the photographing hole 22b, respectively. 25b.
The rotation speed of the motor 24a is controlled by the sync controller 18a so that the irradiation of the pulse laser beam 4 and the opening of the irradiation hole 25a and the imaging hole 25b (alignment position of the irradiation hole 22a and the imaging hole 22b) are synchronized. Is done.
With this configuration, the heat-resistant shutter 24 prevents the radiation light 3 from being incident from the irradiation hole 22a and the imaging hole 22b except at the moment when the irradiation hole 25a and the imaging hole 25b are opened in alignment with the irradiation hole 22a and the imaging hole 22b, respectively. can do.

The high temperature furnace wall imaging device 10 of the present invention further includes an imaging scanning device 26.
In this example, the imaging scanning device 26 includes a support base 26a and a swing actuator 26b.
The above-described pulse laser device 12, imaging device 14, high-speed shutter 16, optical filters 20, 21, heat shield plate 22, and heat-resistant shutter 24 are fixed to the support base 26a.
The support base 26a is supported by a fixed base (not shown) by a spherical bearing 26c, and the entire support base 26a can be moved or rotated in the horizontal and vertical directions by a swing actuator 26b.
With this configuration, the irradiation part of the pulse laser beam 4 by the pulse laser device 12 and the imaging position by the imaging device 14 can be moved along the observation part of the furnace wall 1.

FIG. 2 is a relationship diagram between the radiant light of the furnace wall and the pulsed laser light in the present invention. In this figure, the horizontal axis represents wavelength, the vertical axis represents light intensity, and 3 and 4 in the figure represent radiation light 3 and pulsed laser light 4 from the furnace wall 1.
As shown in this figure, the radiation light 3 from the furnace wall 1 is light having a light emission peak at a wavelength of 2 to 3 μm in the infrared region. Further, visible light having a long wavelength is also included, and the light is emitted in red in the visible light region.
Further, the pulse laser beam 4 has a wavelength in the visible light region (0.38 to 0.77 μm) that is sufficiently far from the peak wavelength of 2 to 3 μm of the radiation light 3. Furthermore, in the present invention, the pulsed laser light 4 is set to have a stronger intensity than the radiation light 3 emitted from the furnace wall 1.
As can be seen from this figure, the wavelength of the radiant light 3 is broad light extending from the visible light to the infrared region, and the intensity of the radiant light 3 in the visible light region is smaller than that near the peak wavelength of 2 to 3 μm. ing.
Therefore, it is possible to irradiate the pulse laser beam 4 stronger than the radiation light 3 using, for example, an Nd: YAG laser in a wavelength sufficiently separated from 2 to 3 μm, preferably in the visible light region.

  In the present invention, since the optical filter 21 that passes only the wavelength of the pulsed laser light 4 and cuts other wavelengths is provided, most of the radiation light 3 incident on the telephoto lens 14b of the photographing apparatus 14 and the CCD camera 14a. The heat input to the imaging device 14 can be significantly reduced by always cutting (other than the wavelength of the pulse laser beam).

FIG. 3 is a relationship diagram between the irradiation of the pulsed laser beam and the operation of the high-speed shutter in the present invention. In this figure, the horizontal axis represents time, and the vertical axis represents laser ON / OFF and shutter opening / closing.
As described above, the high-speed shutter 16 is opened in synchronization with the irradiation time (ON) of the pulsed laser light 4, so that the radiation light 3 incident on the CCD camera 14a can be reduced within this opening time.

According to the configuration of the present invention described above, most of the radiant light 3 reaching the high temperature furnace wall imaging device 10 of the present invention from the furnace wall 1 through the observation window 2 is thermally shielded by the heat shielding plate 22. Therefore, by cooling the outside of the heat shielding plate 22 (outside of the furnace) with cold air or the like, the high temperature furnace wall imaging device 10 of the present invention can be maintained at a temperature that does not hinder normal operation (for example, 30 ° C. or less). .
Further, the radiation light 3 incident through the irradiation hole 22a and the imaging hole 22b of the heat shielding plate 22 is thermally shielded by the heat resistant disk 25 during most of the time except when the heat resistant shutter 24 is opened (during imaging). . Accordingly, the radiation light 3 that directly reaches the pulse laser device 12 and the imaging device 14 by blocking the radiation light 3 except during imaging can be significantly reduced.
In addition, since most of the wavelengths other than the limited wavelength are always cut by the optical filters 20 and 21 that pass only the wavelength of the pulse laser beam and cut other wavelengths, the pulse filters are directly applied to the pulse laser device 12 and the imaging device 14. The energy of the radiant light 3 reaching can be further greatly reduced.

Further, since the pulsed laser beam 4 having a divergence angle equivalent to the minimum viewing angle is irradiated toward the observation part (a sufficiently small part) of the furnace wall 1, it enters the exit from the irradiation part of the furnace wall 1. Therefore, the pulsed laser device can be easily maintained in a safer temperature range.
Further, since the irradiated portion is photographed from the remote at the minimum required viewing angle, there is little radiation light incident on the photographing device from the irradiated portion of the furnace wall 1, and the photographing device can be easily maintained in a safe temperature range. .
Furthermore, since the high-speed shutter 16 is positioned between the imaging device 16 and the furnace wall 1 and opens in synchronization with the irradiation time of the pulse laser beam 4, the irradiation portion (a sufficiently small part) of the furnace wall 1 enters the imaging device. The radiant light 3 can be limited to a short time when the high-speed shutter 16 is opened, and the photographing apparatus can be easily maintained in a safer temperature range.

As described above, according to the configuration of the present invention, the divergence angle is stronger than the radiation light 3 from the furnace wall 1 toward the sufficiently small part of the observation part of the furnace wall 1 and has a spread angle equivalent to the minimum necessary viewing angle. The pulsed laser beam 4 is irradiated, and the irradiated part is remotely photographed at the minimum necessary viewing angle. Therefore, the strong pulsed laser beam 4 forms shadows due to unevenness and cracks in the furnace wall 1 and provides a contrasting furnace wall image. It is possible to determine the unevenness and cracks in the furnace wall.
Therefore, with this configuration, it is possible to continuously observe from the outside of the furnace wall through the observation window the furnace wall in which the temperature inside the furnace is high and the furnace wall emits radiation.

  In addition, by providing an imaging scanning device 26 that moves the irradiated portion of the pulse laser beam 4 by the pulse laser device 12 and the imaging position of the imaging device 14 along the observation portion of the furnace wall 1, an increase in the amount of incident radiation is prevented. However, a wide range of observation parts can be photographed.

  Furthermore, by providing a storage device that stores a plurality of captured images and an image processing device that combines the plurality of captured images, a wide range of observation parts are displayed as continuous images, and the unevenness and cracks of the furnace wall can be discriminated. Can be easily.

  Therefore, conventionally, there has been no means for safely observing the furnace wall in which the temperature inside the furnace is high and the furnace wall emits radiation, but this is possible by the present invention. When the wind is down to around 1400 ° C., the furnace wall irregularities and cracks can be accurately identified based on the contrasted furnace wall image, and the furnace can be used safely to the limit.

Using the apparatus of the present invention described above, a part of the furnace wall of the hot blast furnace for the blast furnace in which the temperature in the furnace is lowered to about 1400 ° C. when the wind is not taken is photographed from the outside of the observation window 2 and is imaged by the image processing apparatus. A plurality of (34 in this case, 5 × 7-1) photographed images were created by pasting them along the observation part of the furnace wall. The captured image is omitted.
Conventionally, radiation having the same intensity and the same wavelength is emitted from any position, so only an image having no contrast can be obtained even if the furnace wall has irregularities or cracks.
On the other hand, in the photographed image of the present invention, it was confirmed that although there were no cracks, it was possible to accurately determine the state in which the refractory bricks were densely stacked.
Therefore, this contrasting furnace wall image can be acquired to determine the unevenness and cracks in the furnace wall, and the furnace can be used safely to the limit.

  In addition, this invention is not limited to embodiment mentioned above, Of course, it can change variously in the range which does not deviate from the summary of this invention.

It is a whole block diagram of the high temperature furnace wall imaging device of this invention. It is a related figure of the radiation light of the furnace wall in this invention, and a pulse laser beam. FIG. 6 is a relationship diagram between pulse laser light irradiation and operation of a high-speed shutter in the present invention. FIG. 2 is a schematic diagram of a “hot-blast furnace observation apparatus” in Patent Document 1. 10 is a schematic diagram of a “furnace wall observation device” in Patent Document 2. FIG.

Explanation of symbols

1 furnace wall, 2 observation window, 3 radiation light, 4 pulse laser light,
10 high temperature furnace wall imaging device, 12 pulse laser device,
12a pulse laser oscillator, 12b power supply device,
12c irradiation optical system, 12d optical fiber,
14 imaging device, 14a CCD camera, 14b telephoto lens,
16 high-speed shutter (electronic shutter), 18 imaging control device,
18a Sync controller, 18b Computer (PC),
20, 21 optical filter, 22 heat shielding plate,
22a Irradiation hole, 22b Shooting hole,
24 heat-resistant shutter, 24a motor,
25 heat resistant disk, 25a irradiation hole, 25b photographing hole,
26 imaging scanning device, 26a support base,
26b Swing actuator, 26c Spherical bearing

Claims (6)

A high-temperature furnace wall imaging device installed outside the observation window in order to remotely image the furnace wall in which the temperature inside the furnace is high and the furnace wall emits radiation light,
A pulse laser device that irradiates the observation part of the furnace wall with a pulsed laser beam that is stronger than the radiation light and has a spread angle equivalent to the minimum required viewing angle;
An imaging device that remotely images the irradiated portion of the pulsed laser light from the minimum necessary viewing angle;
A high-temperature furnace wall imaging apparatus, comprising: a high-speed shutter positioned between the imaging apparatus and the furnace wall and opened in synchronization with an irradiation time of the pulse laser beam.   2. The high-temperature furnace wall imaging apparatus according to claim 1, wherein the optical axes of the pulse laser apparatus and the imaging apparatus are parallel to each other or intersect in the vicinity of the furnace wall position. A heat shielding plate installed outside the observation window and having an irradiation hole of a size that allows only the pulsed laser light to pass through, and an imaging hole of a size that can image only the irradiated portion;
The high-temperature furnace wall imaging apparatus according to claim 1, further comprising an optical filter that blocks between the imaging hole and the imaging apparatus and allows only a wavelength of pulsed laser light to pass.   The high-temperature furnace wall imaging apparatus according to claim 2, further comprising a heat-resistant shutter that opens the irradiation hole and the imaging hole in synchronization with an irradiation time of the pulse laser light.   2. The high-temperature furnace wall imaging apparatus according to claim 1, further comprising: an imaging scanning device that moves an irradiation portion of the pulse laser beam by the pulse laser device and an imaging position of the imaging device along an observation portion of the furnace wall. . A storage device for storing a plurality of photographed images by the photographing device;
The high-temperature furnace wall imaging apparatus according to claim 1, further comprising an image processing apparatus that bonds a plurality of photographed images along an observation portion of the furnace wall.

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