Shutter target device for hot spot observation of energetic powder under impact action

Abstract

In order to observe the development process of the hot spot of the impact powder, a specific target device for observing the luminescence process of the impact energetic powder is provided in the patent, the thickness of the powder sample is selected, the time of the radiation observation window is accurately controlled by combining the change of the thickness of the different sapphire windows, the damage of the corresponding optical fiber head is driven by the damage of the impact sapphire in the patent, the light channel is closed at a specific time point, and finally the effect similar to the shutter of the camera is achieved; the device can be used for accurately observing the development process of the hot spot in the energetic powder, and the implementation effect shows that the device can meet the observation demand of the initiation mechanism of the explosive powder.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of initiation mechanism of explosive materials under the action of impact in the field of detonation physics, and particularly relates to a shutter target device for observing hot spots of energetic powders under the action of impact. BACKGROUND

[0002] With the development of weapon systems and the need to face high-tech wars, insensitive ammunition has become the development trend of ammunition in the world, and the development of high-energy low-sensitivity explosives is the key technology to realize insensitive ammunition. However, a deep understanding of the initiation mechanism of explosive materials is the basis for improving the safety and reliability of explosives and enhancing the detonation efficiency of explosives. Previous experiments and theoretical studies have shown that when an explosive is acted on by an impact wave of a certain intensity, local high-temperature hot spots will be formed inside the explosive. The temperature of these hot spots is much higher than that of the bulk material of the explosive, and the hot spots will ignite the surrounding bulk material, leading to intense combustion to form a detonation wave, and finally detonate the explosive.

[0003] The initiation mechanism of explosives is mainly related to the hot spot theory caused by impact. The hot spot theory is an important and complex theory. In the past few decades, a large number of theoretical and experimental studies have been conducted on the formation mechanism of hot spots and some related models have been proposed. Among them, the void impact collapse model is widely used. The void impact collapse model refers to the collapse of the void under pressure when the impact wave interacts with the void in the explosive, and the spattering of the material on the surface of the void causes energy to accumulate at the void position, forming a high-temperature hot spot.

[0004] Under the action of different impact intensities, the development of hot spots generally shows two trends: under the condition of low impact intensity, energy accumulates in the void to form a hot spot. Under the action of the impact wave, the number of hot spots will increase over time, as shown in the schematic diagram Figure 1 . However, due to insufficient impact energy, the hot spots will eventually extinguish. Under high impact intensity, after the formation of hot spots, the energetic powder undergoes thermal-chemical reaction within a short time, releasing a large amount of energy. The accumulation of energy leads to the aggregation behavior of hot spots, resulting in deflagration, forming a detonation wave. Under the combined action of the impact wave and the detonation wave, the energy formed across the barrier, causing the surface of the adjacent explosive to rapidly heat up and spontaneously ignite, resulting in deflagration, Figure 2 , which shows the dynamic process of hot spot formation to deflagration of energetic powder material under the action of flyer impact. a is the time when the flyer does not reach the powder sample; b is the formation of local hot spots with high color temperature but small emission volume fraction under short-time impact; after the impact is removed, most of the hot spots will disappear, but a few hot spots will grow as shown in c; the entire sample is densified under the impact and environmental pressure, and may be ignited by the continuously growing hot spots, resulting in deflagration, as shown in d.

[0005] It is very important to determine the generation and development of hot spot for explosive powder, which helps to determine the detonation condition and efficiency. However, it is difficult to observe the generation and development of hot spot directly. When the material explodes, the observation window of hot spot is short and the development is fast, so it is difficult to observe the tiny transient hot spot. The existence and behavior of hot spot are inferred from simulation results to a large extent. There is a lack of experimental method to observe the formation and development of explosive hot spot under impact. There is no effective technical means to explore the conditions under which detonation occurs.

[0006] According to the classical theory of thermal radiation, when the temperature of the impact powder surface is uniform, the blackbody or graybody model can be used to describe the thermal radiation characteristics of the impact powder material surface. The emitted spectral brightness is described by Planck formula:

[0007] {I}_{pl}\left ( {\lambda,T} \right )=\epsilon \times {C}_{1}{\lambda}^{-5}\left [ {exp\left ( {{C}_{2} / \lambda T} \right )-1} \right ]^{-1} (1)

[0008] In the formula, C1 and C2 are the first and second radiation coefficients, λ is the wavelength, T is the temperature, and ε is the graybody emissivity, which is a positive value less than 1. If ε is equal to 1, it belongs to the blackbody model. When ε is less than 1, it is the spectral radiation brightness of graybody. The measured radiation energy in the experiment is fitted by formula (1), which can obtain a radiation temperature T and an average emissivity ε at the same time. The radiation brightness image at this time is as follows: Figure 3 The solid line is the fitting curve of formula (1).

[0009] When the impact powder surface temperature is not the same, such as Figure 4 The background radiation brightness of the impact powder is B, which is a uniform radiation temperature. The radiation brightness of the hot spot of the impact powder is A, which corresponds to a temperature higher than the radiation temperature of B line. The combination of the two radiation brightnesses is the measured radiation brightness curve c. When the temperature difference between the curves A and B is large, such as more than 1000 degrees, the curve c is difficult to fit by formula (1), which will show the "sudden" abnormal characteristics of the experimental radiation brightness at a certain wavelength.

[0010] Therefore, as long as the abnormal radiation brightness at a certain wavelength is measured as curve c, it means that the radiation of the hot spot on the impact powder surface is obvious.

[0011] When hotspots exist on the powder surface, the radiation temperature of these hotspots is uniform. The radiation intensity at certain wavelengths measured by the radiometer is proportional to the density of the hotspots. Therefore, accurately measuring the radiance at each wavelength is crucial for determining the development of hotspots. In other words, the dynamic process of hotspot occurrence and development requires time-resolved experimental radiance measurements.

[0012] To date, only some American studies have used laser shock to measure the radiation of hot spots. For example, Bassett WP, et al. Hot-spot generation and growth in shocked plastic-bondedexplosives studied by optical pyrometry. Journal of Applied Physics, 2019, 125(21): 215904. This paper used laser shock to measure the radiance of energetic materials. However, due to the short laser pulse time and small sample diameter, the rarefaction waves on the side of the sample enter the observation interface in a short time after the shock. When the hot spot development time exceeds 50 nanoseconds, the observation cannot be carried out. As a result, the observation time window is very limited in the experiment of observing the radiation of the powder surface by laser shock. Summary of the Invention

[0013] To address the aforementioned issues, this invention designs a device similar to a shock wave shutter to observe the generation and development of hotspots in energetic powders of varying thicknesses under the same impact, determining whether they reach a detonation state. This device operates on an impact gas gun, with a time window reaching the microsecond level, extending the observation time by more than 20 times compared to existing laser shock observations. This significantly expands the scope of research on the mechanism of impact hotspot generation, enabling studies in areas such as delayed excitation of impact hotspots. This invention can also explore the influence of different porosities, material ratios, and energetic powder particle sizes on the generation and development of energetic powder hotspots under the same impact.

[0014] To solve the above problems, the present invention can specifically adopt the following technical solution:

[0015] Observational shutter target device, including

[0016] The sample chamber has a through cavity.

[0017] The substrate is disposed in the cavity of the compartment.

[0018] An outer mold plate is disposed in the cavity of the chamber and has an outer mold plate through hole, which is used to place the energetic powder plate and the inner mold plate.

[0019] An inner mold piece is disposed within the through hole of the outer mold piece, the inner mold piece having an inner mold piece through hole.

[0020] The sapphire wafer is placed in the through hole of the inner mold plate.

[0021] A fiber optic probe holder is disposed in a through hole in the inner mold plate, and the fiber optic probe holder is used to fix the fiber optic probe; wherein...

[0022] The end of the fiber optic probe located in the observation shutter target device is adjacent to the sapphire sheet and can be damaged by impact and / or high temperature, resulting in the inability to transmit optical signals.

[0023] In some embodiments, a fixing cover is included, which, after being connected to the sample chamber, is used to abut against and fix the outer and inner mold plates; the fixing cover has a cover body through hole through which an optical fiber probe can be inserted.

[0024] In some embodiments, the sample chamber has a cover connecting portion at one end away from the substrate, and the fixed cover has a chamber connecting portion at one end; the fixed cover is connected to the sample chamber by the adaptation of the cover connecting portion and the chamber connecting portion.

[0025] In some embodiments, the fiber optic probe holder has a through-hole for inserting and securing the fiber optic probe.

[0026] In some embodiments, the inner wall of the fastener through-hole near the substrate has an outward expansion portion, the inner diameter of which gradually increases from the inside to the outside of the fastener through-hole.

[0027] In some embodiments, the tip of the fiber optic probe is wetted with tribromomethane.

[0028] In some embodiments, the sample chamber is further provided with an air cannon connection at the end away from the fixed cover mounting position, and the air cannon chamber of the air cannon connection can communicate with the cavity of the chamber body.

[0029] In some embodiments, the substrate is located between the gas cannon cavity and the chamber passage.

[0030] In some embodiments, the fiber optic probe is also connected to a radiation pyrometer; any of the fiber optic probes has several radiation channels; the substrate is a metal substrate, preferably an oxygen-free copper substrate.

[0031] In some methods, in the shutter target device

[0032] An outer mold plate is disposed in the cavity of the chamber and has at least two through holes for placing energetic powder plates and an inner mold plate.

[0033] The inner mold pieces are at least two in number and are respectively disposed in different through holes of the outer mold pieces. The thickness of the inner mold pieces is not equal, and the inner mold pieces are provided with through holes.

[0034] The sapphire wafers are at least two in number and are disposed in different through-holes in the inner mold sheet.

[0035] The fiber optic probe holder has at least two parts, each disposed in a different inner mold plate through hole, and is used to fix the fiber optic probe; wherein, at most one inner mold plate is disposed in the outer mold plate through hole, at most one sapphire plate is disposed in any outer mold plate through hole, and at most one fiber optic probe holder is disposed in any outer mold plate through hole.

[0036] In some embodiments, multiple through holes in the outer mold plate are evenly distributed with the center of the outer mold plate as the center of symmetry.

[0037] The beneficial effects of this invention are as follows: When energetic powder undergoes detonation, the hotspot density increases significantly, and its spectral brightness rises sharply in a short period of time. By comparing the peak values ​​of the spectral brightness of multiple groups of energetic powders, it is possible to determine whether the sample has reached the detonation state and to determine the impact intensity and material thickness at which it reaches the detonation state. This invention, by changing the porosity in the through-hole, the material ratio, and the particle size of the energetic powder, fits the radiation intensity obtained under impact using Planck's formula to obtain the fitting temperature and emissivity. It can also explore the influence of the above factors on the generation and development of hotspots in energetic powders under the same impact. Attached Figure Description

[0038] Figure 1 This is a diagram showing the distribution of hot spots inside the explosive powder after impact.

[0039] Figure 2 A diagram illustrating the phenomenon of hotspot explosion;

[0040] Figure 3 The radiation brightness curve when the surface temperature of the impact powder is uniform;

[0041] Figure 4 The radiance curve when the surface temperature of the impact powder is inconsistent;

[0042] Figure 5 A schematic diagram of the exploded structure of the target device;

[0043] Figure 6 This is a schematic diagram of a method for observing the distribution of hotspots at interfaces of different thicknesses under impact.

[0044] Figure 7 Here is a structural diagram of the sample chamber;

[0045] Figure 8 For the structure diagram of the fixed cover;

[0046] Figure 9 This is a structural diagram of the outer mold piece;

[0047] Figure 10A structural diagram of the fiber optic probe fixing mold and inner mold plate;

[0048] Figure 11 This is a schematic diagram showing the damage to the sapphire window and light probe of the present invention under the action of a shock wave;

[0049] Figure 12 This is a diagram of the measured spectral radiance.

[0050] In the picture:

[0051] 100 Sample chamber, 110 Chamber cavity, 120 Cover connection, 130 Base, 140 Groove, 200 Substrate, 300 Outer mold, 310 Outer mold through hole, 400 Inner mold, 410 Inner mold through hole, 500 Sapphire sheet, 510 Broken sapphire sheet, 600 Fiber optic probe holder, 610 Holder through hole, 700 Fixed fiber optic probe, 800 Fixed cover, 810 Cover through hole, 820 Chamber connection, 900 Flying piece, 1000 Hot spot, 1100 Tribromomethane, 1200 Sample, 1300 Tribromomethane, 1400 Fiber optic probe, 1500 Fiber optic cable, 1510 Fused fiber optic cable. Detailed Implementation

[0052] The invention will now be further described with reference to the accompanying drawings.

[0053] A method and apparatus for observing hotspots in energetic powder materials under strong impact is proposed. Specifically, a flying disc is accelerated by an air gun impact and then strikes a metal substrate, generating a shock wave. This shock wave compresses three groups of powder materials of different thicknesses, creating a high-temperature, high-pressure state within the energetic powder material (such as explosive powder), resulting in random hotspots. The light radiation generated by these hotspots is collected by a radiation pyrometer to obtain their spectral radiance. A schematic diagram of the specific principle is shown below. Figure 6 .

[0054] A target device that meets the experimental conditions was designed:

[0055] Observational shutter target device, including

[0056] Sample chamber 100 has a chamber cavity 110.

[0057] The substrate 200 is disposed in the cavity 110 of the compartment.

[0058] An outer mold plate 300 is disposed in the cavity 110 of the chamber and has an outer mold plate through hole 310, which is used to place the energetic powder sheet 10 and the inner mold plate 400.

[0059] An inner mold piece 400 is disposed within the through hole 310 of the outer mold piece, wherein the inner mold piece 400 has an inner mold piece through hole 410.

[0060] A sapphire sheet 500 is disposed in the through hole 410 of the inner mold sheet.

[0061] A fiber optic probe holder 600 is disposed in the through hole 410 of the inner mold plate, and the fiber optic probe holder 600 is used to fix the fiber optic probe 700; wherein...

[0062] The end of the fiber optic probe 700 located in the observation shutter target device is adjacent to the sapphire sheet 500 and can be damaged by impact and / or high temperature, resulting in the inability to transmit optical signals.

[0063] In some embodiments, a fixing cover 800 is included. After the fixing cover 800 is connected to the sample chamber 100, the fixing cover 800 is used to abut against and fix the outer mold plate 300 and the inner mold plate 400. The fixing cover 800 has a cover body through hole 810, through which an optical fiber probe 700 can be inserted.

[0064] In some embodiments, the sample chamber 100 has a cover connecting portion 120 at one end away from the substrate 200, and the fixed cover 800 has a chamber connecting portion 820 at one end; the fixed cover 800 is connected to the sample chamber 100 by the adaptation of the cover connecting portion 120 and the chamber connecting portion 820.

[0065] In some embodiments, the fiber optic probe holder 600 has a holder through hole 610 for inserting and securing the fiber optic probe 700.

[0066] In some embodiments, the inner wall of the fastener through hole 610 near the end of the substrate 200 has an outwardly expanding portion 620, the inner diameter of which gradually increases from the inside to the outside of the fastener through hole 610.

[0067] In some embodiments, the end of the fiber optic probe 700 is wetted with tribromomethane.

[0068] In some embodiments, the sample chamber 100 is further provided with an air cannon connection at one end away from the mounting position of the fixed cover 800, and the air cannon chamber of the air cannon connection can communicate with the chamber cavity 110.

[0069] In some embodiments, the substrate 200 is located between the gas cannon cavity and the chamber passage 110.

[0070] In some embodiments, the fiber optic probe 700 is also connected to a radiation pyrometer; any of the fiber optic probes 700 has several radiation channels; the substrate 200 is a metal substrate, preferably an oxygen-free copper substrate.

[0071] In practical applications, some components of the aforementioned shutter target device (such as the outer mold plate, inner mold plate, sapphire plate, and fiber optic probe fixing component) can be set as a set. If multiple sets of data are required, the device can be used to load energetic powder plates and sapphire plates of different thicknesses to repeat the test multiple times. In addition, in some examples, multiple sets of some components in the shutter target device are set, as detailed below.

[0072] An outer mold plate 300 is disposed in the cavity 110 of the chamber and has at least two outer mold plate through holes 310, which are used to place the energetic powder sheet 10 and the inner mold plate 400.

[0073] There are at least two inner mold pieces 400, each disposed in a different outer mold piece through hole 310, and the thickness of the inner mold pieces 400 is not equal. Each inner mold piece 400 has an inner mold piece through hole 410.

[0074] There are at least two sapphire wafers 500, each disposed in a different through-hole 410 in the inner mold plate.

[0075] At least two fiber optic probe holders 600 are provided, each disposed in a different inner mold through-hole 410, and the fiber optic probe holders 600 are used to fix the fiber optic probe 700; wherein,

[0076] At most one inner mold plate 400 is provided in the outer mold plate through hole 310, at most one sapphire plate 500 is provided in any outer mold plate through hole 310, and at most one fiber optic probe fixing component 600 is provided in any outer mold plate through hole 310.

[0077] The multiple outer mold plate through holes 310 are evenly distributed with the center of the outer mold plate 300 as the center of symmetry, thereby ensuring that each unit is subjected to the same impact during the impact process and reducing the influence of the sparse waves on the side.

[0078] When the target device has three sets of propellant placement units, since the experiment uses three sets of samples with different thicknesses, they will exhibit different degrees of luminescence when subjected to the same impact. After the energetic powder undergoes detonation, the hot spot density increases significantly, and its spectral brightness rises sharply in a short period of time. By comparing the peak values ​​of the spectral brightness of the three sets of energetic powders, it is possible to determine whether the sample has reached the detonation state and to determine the impact intensity and material thickness at which the detonation state is achieved.

[0079] The structure of each component within the device is described in detail:

[0080] Sample chamber 100 Figure 7As shown, the sample chamber 100 is hollow inside to house the inner mold plate 400 and the outer mold plate 300. A cover connecting part 120 is provided at the upper end of the sample chamber 100 for screwing on and fixing the cover 800. The lower end of the sample chamber 100 is a base 130, which is a cylinder with a lower thickness and a larger diameter than the upper section, to facilitate fixing the target device to the target mount of the secondary light gas gun. A trapezoidal groove 140 is opened in the middle, the upper part of which corresponds to the chamber cavity 110 in the upper section of the sample chamber 100. The diameter of the lower hole is slightly lower than that of the upper hole, used to place the metal substrate 200 and support the inner mold plate 400 and the outer mold plate 300. The fixing cover 800 is as follows... Figure 8 As shown, the center of the fixing cover 800 is a hollow through hole 610 for fixing components. The upper section of the fixing cover 800 is a hollow, protruding cone used to abut against the sample chamber 100, fixing the inner mold plate 400 and outer mold plate 300 inside the sample chamber to prevent them from sliding. The middle section is the chamber body connecting part 800, used to fix it to the sample chamber 100. The lower section is a base plate with a diameter slightly higher than the upper section. The outer mold plate 300 is as follows... Figure 9 As shown, the outer mold plate 300 is cylindrical in shape, with three symmetrical through holes 310 at its center to hold powder samples of different thicknesses. The inner mold plate 400 and the fiber optic probe fixing mold 700 are as follows. Figure 10 As shown, the inner mold plate 400 is a cylinder with a hollow inner mold plate through hole 410 in the center, which is used to place sapphire sheets 500 of different thicknesses. The diameter of the inner mold plate 400 is the same as the diameter of the outer mold plate through hole 310. The light probe fixing component 600 is similar to a hollow metal rod, with a conical groove with an angle of 30° cut on it to ensure that the head of the light probe can be destroyed under the action of the shock wave, thus preventing the transmission of light signals.

[0081] During the experiment, a cylindrical oxygen-free copper substrate was prepared. Oxygen-free copper can reduce the effect of interfacial thermal radiation and minimize the impact of metallic luminescence on hotspot observation of the sample. At least two energetic powder sample sheets with progressively increasing thickness were prepared and numbered. To maintain the sample morphology and facilitate the formation of hotspots under impact, the samples needed to be pre-pressed at a pressure of 4-10 MPa. At least two sapphire windows with progressively increasing thickness were prepared. The metal substrate was placed at the bottom of the sample chamber, and then the outer mold was placed on the substrate. The prepared cylindrical explosive samples were placed sequentially into the three cylindrical holes of the outer mold and numbered. Then, three inner molds were embedded into the outer mold, and the sapphire windows with progressively increasing thickness were placed according to their numbers. The fiber optic probe fixing mold was inserted into the groove of the inner mold and fixed with AB glue. The fixing cover was screwed tightly onto the sample chamber to complete the assembly of the target device. During the experiment, the target device was fixed on the target mount in the secondary light gas gun target chamber. The surfaces of the three fiber optic probes were wetted with tribromomethane. Wetting with tribromomethane has two advantages: first, due to the surface tension of the liquid, tribromomethane can form an elliptical shape on the sapphire surface, acting as a lens and increasing the range of light radiation received by the fiber optic probes; second, under the action of the shock wave, tribromomethane will generate high temperatures, melting the fiber optic probes. The wetted fiber optic probes were placed in a fiber optic head fixing mold, and the tail end of the fiber optic probe was connected to a radiation pyrometer as a spectral radiance acquisition device.

[0082] Because the two-stage light gas gun has advantages such as a large and stable shock wave front, and the ability to instantly load the flyer plate to high speed, after the device is assembled, the two-stage light gas gun is used to load the flyer plate to a speed of 1.5 km / s to 4 km / s to impact the metal substrate, forming a shock wave. The shock wave interacts with the sample, loading the sample into a high-temperature and high-pressure state. The sample is compressed, and the local gaps between the samples collapse, forming high-temperature hot spots.

[0083] After the shock wave front passes through the sample, it will continue to move to the right, such as... Figure 11 As shown, due to the sequentially increasing thickness of the three sample groups and their corresponding windows, the sapphire windows break sequentially under the shock wave, the interface luminescence is scattered, the temperature of tribromomethane rises rapidly, causing the optical fiber to melt and data acquisition to stop sequentially. In the low-thickness sample, after hot spots are formed under the impact, the interface luminescence signal acquisition terminates. Simultaneously, in the high-thickness sample, the shock wave continues to act, generating more hot spots. These hot spots may exhibit aggregation behavior, releasing a large amount of energy. This released energy overcomes the potential barrier, achieving deflagration and forming a detonation wave. The detonation wave and the shock wave form a mixed wave, acting together on the powder sample, resulting in a sharp increase in spectral brightness. This contrasts with the low-thickness sample, allowing us to explore the influence of explosive thickness on the density and growth pattern of hot spots under the same impact, and to determine whether detonation has been achieved.

[0084] The light radiation generated by the sample is transmitted to the light probe through the window and recorded by a multi-channel radiation pyrometer. Since the spectral range of observable hot spot radiation is 440nm~850nm, 4~8 channels are set in this range. The radiation intensity at each wavelength is fitted with Planck's formula to obtain the temperature and emissivity of the three groups of powder samples under impact over time. The growth phenomenon of hot spots in explosive powder of different thicknesses is judged by the change in emissivity, and the spectral radiation intensity recorded by the radiation pyrometer is observed.

[0085] Figure 12 The images show the radiation intensity of energetic material DAAF (diaminoazofuran) with thicknesses of 0.15 mm, 0.285 mm, and 0.645 mm at an impact velocity of 1.6 km / s, measured at a wavelength of 650 nm. The peak values ​​for the three groups of samples are A2, B2, and C2, respectively. It is found that the value of C2 is much larger than that of A2 and B2. Based on the theory mentioned earlier, we can conclude that due to the increase in sample thickness, the hot spot in the thicker sample was fully developed and eventually reached a deflagration state, resulting in a sharp increase in radiation intensity. The peak value of the measured radiation intensity far exceeds that of the other two groups of thinner samples, proving that the device has met the design requirements.

[0086] Those skilled in the art will appreciate that various modifications to the above embodiments can be made without departing from the overall spirit and concept of the present invention. All such modifications fall within the protection scope of the present invention. The protection scheme of the present invention is defined by the appended claims.

Claims

1. A shutter target device for observation, characterized in that, The system includes a sample chamber (100) having a chamber cavity (110), a substrate (200) disposed in the chamber cavity (110), an outer mold plate (300) disposed in the chamber cavity (110) and having at least two outer mold plate through holes (310), an energetic powder sheet (10) disposed in the outer mold plate through holes (310), at least two inner mold plates (400) respectively disposed in different outer mold plate through holes (310), the inner mold plate (400) having an inner mold plate through hole (410), at least two sapphire sheets (500) respectively disposed in different inner mold plate through holes (410), and an optical fiber probe fixing component (6). At least two inner mold plates (400) are provided in different inner mold plate through holes (410) for fixing fiber optic probes (700); wherein the end of the fiber optic probe (700) is adjacent to the sapphire plate (500) and can be damaged by impact and / or high temperature, thereby causing interruption of optical signal transmission; wherein at most one inner mold plate (400) is provided in the outer mold plate through hole (310), and at most one sapphire plate (500) and one fiber optic probe fixing member (600) are provided in any inner mold plate through hole (410); the plurality of outer mold plate through holes (310) are evenly distributed with the center of the outer mold plate (300) as the center of symmetry.

2. The observation shutter target device according to claim 1, characterized in that, It also includes a fixing cover (800), which, after being connected to the sample chamber (100), is used to abut against and fix the outer mold plate (300) and the inner mold plate (400); the fixing cover (800) has a cover body through hole (810), through which an optical fiber probe (700) can be inserted.

3. The observation shutter target device according to claim 2, characterized in that, The sample chamber (100) is provided with a cover connecting part (120) at one end away from the substrate (200), and the fixed cover (800) is provided with a chamber connecting part (820) at one end; the fixed cover (800) is connected to the sample chamber (100) by the adaptation of the cover connecting part (120) and the chamber connecting part (820).

4. The observation shutter target device according to claim 1, characterized in that, The fiber optic probe holder (600) has a holder through hole (610) for inserting and fixing the fiber optic probe (700).

5. The observation shutter target device according to claim 4, characterized in that, The inner wall of the fastener through hole (610) near the substrate (200) has an outward expansion portion (620), and the inner diameter of the outward expansion portion (620) gradually increases from the inside to the outside of the fastener through hole (610).

6. The observation shutter target device according to claim 1, characterized in that, The end of the fiber optic probe (700) is wetted with tribromomethane.

7. The observation shutter target device according to claim 1, characterized in that, The sample chamber (100) is also provided with an air cannon connection part at one end away from the mounting position of the fixed cover (800), and the air cannon chamber of the air cannon connection part can communicate with the chamber body through cavity (110).

8. The observation shutter target device according to claim 7, characterized in that, The substrate (200) is located between the air cannon cavity and the chamber cavity (110).

9. The observation shutter target device according to claim 1, characterized in that, The fiber optic probe (700) is also connected to a radiation pyrometer; each of the fiber optic probes (700) has several radiation channels; the substrate (200) is an oxygen-free copper substrate.

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